1791 lines
55 KiB
C
1791 lines
55 KiB
C
/**
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* \file
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*
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* \brief SAM TC - Timer Counter Driver
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*
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* Copyright (C) 2013-2016 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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*/
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#ifndef TC_H_INCLUDED
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#define TC_H_INCLUDED
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/**
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* \defgroup asfdoc_sam0_tc_group SAM Timer/Counter (TC) Driver
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*
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* This driver for Atmel® | SMART ARM®-based microcontrollers provides an interface for the configuration
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* and management of the timer modules within the device, for waveform
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* generation and timing operations. The following driver API modes are covered
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* by this manual:
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*
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* - Polled APIs
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* \if TC_CALLBACK_MODE
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* - Callback APIs
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* \endif
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*
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*
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* The following peripheral is used by this module:
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* - TC (Timer/Counter)
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*
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* The following devices can use this module:
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* - Atmel | SMART SAM D20/D21
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* - Atmel | SMART SAM R21
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* - Atmel | SMART SAM D09/D10/D11
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* - Atmel | SMART SAM L21/L22
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* - Atmel | SMART SAM DA1
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* - Atmel | SMART SAM C20/C21
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*
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* The outline of this documentation is as follows:
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* - \ref asfdoc_sam0_tc_prerequisites
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* - \ref asfdoc_sam0_tc_module_overview
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* - \ref asfdoc_sam0_tc_special_considerations
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* - \ref asfdoc_sam0_tc_extra_info
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* - \ref asfdoc_sam0_tc_examples
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* - \ref asfdoc_sam0_tc_api_overview
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*
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*
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* \section asfdoc_sam0_tc_prerequisites Prerequisites
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*
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* There are no prerequisites for this module.
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*
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*
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* \section asfdoc_sam0_tc_module_overview Module Overview
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*
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* The Timer/Counter (TC) module provides a set of timing and counting related
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* functionality, such as the generation of periodic waveforms, the capturing
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* of a periodic waveform's frequency/duty cycle, and software timekeeping for
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* periodic operations. TC modules can be configured to use an 8-, 16-, or
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* 32-bit counter size.
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*
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* This TC module for the SAM is capable of the following functions:
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*
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* - Generation of PWM signals
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* - Generation of timestamps for events
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* - General time counting
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* - Waveform period capture
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* - Waveform frequency capture
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*
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* \ref asfdoc_sam0_tc_block_diagram "The diagram below" shows the overview
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* of the TC module design.
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*
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* \anchor asfdoc_sam0_tc_block_diagram
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* \image html overview.svg "Basic Overview of the TC Module"
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*
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*
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* \subsection asfdoc_sam0_tc_features Driver Feature Macro Definition
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* <table>
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* <tr>
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* <th>Driver Feature Macro</th>
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* <th>Supported devices</th>
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* </tr>
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* <tr>
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* <td>FEATURE_TC_DOUBLE_BUFFERED</td>
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* <td>SAM L21/L22/C20/C21</td>
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* </tr>
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* <tr>
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* <td>FEATURE_TC_SYNCBUSY_SCHEME_VERSION_2</td>
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* <td>SAM L21/L22/C20/C21</td>
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* </tr>
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* <tr>
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* <td>FEATURE_TC_STAMP_PW_CAPTURE</td>
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* <td>SAM L21/L22/C20/C21</td>
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* </tr>
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* <tr>
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* <td>FEATURE_TC_READ_SYNC</td>
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* <td>SAM L21/L22/C20/C21</td>
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* </tr>
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* <tr>
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* <td>FEATURE_TC_IO_CAPTURE</td>
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* <td>SAM L21/L22/C20/C21</td>
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* </tr>
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* <tr>
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* <td>FEATURE_TC_GENERATE_DMA_TRIGGER</td>
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* <td>SAM L21/L22</td>
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* </tr>
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* </table>
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* \note The specific features are only available in the driver when the
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* selected device supports those features.
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*
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* \subsection asfdoc_sam0_tc_module_overview_func_desc Functional Description
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* Independent of the configured counter size, each TC module can be set up
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* in one of two different modes; capture and compare.
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*
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* In capture mode, the counter value is stored when a configurable event
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* occurs. This mode can be used to generate timestamps used in event capture,
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* or it can be used for the measurement of a periodic input signal's
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* frequency/duty cycle.
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*
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* In compare mode, the counter value is compared against one or more of the
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* configured channel compare values. When the counter value coincides with a
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* compare value an action can be taken automatically by the module, such as
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* generating an output event or toggling a pin when used for frequency or
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* Pulse Width Modulation (PWM) signal generation.
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*
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* \note The connection of events between modules requires the use of the
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* \ref asfdoc_sam0_events_group "SAM Event System Driver (EVENTS)"
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* to route output event of one module to the input event of another.
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* For more information on event routing, refer to the event driver
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* documentation.
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*
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* \subsection asfdoc_sam0_tc_module_overview_tc_size Timer/Counter Size
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* Each timer module can be configured in one of three different counter
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* sizes; 8-, 16-, and 32-bit. The size of the counter determines the maximum
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* value it can count to before an overflow occurs and the count is reset back
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* to zero. \ref asfdoc_sam0_tc_count_size_vs_top "The table below" shows the
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* maximum values for each of the possible counter sizes.
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*
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* \anchor asfdoc_sam0_tc_count_size_vs_top
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* <table>
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* <caption>Timer Counter Sizes and Their Maximum Count Values</caption>
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* <tr>
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* <th>Counter size</th>
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* <th>Max. (hexadecimal)</th>
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* <th>Max. (decimal)</th>
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* </tr>
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* <tr>
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* <td>8-bit</td>
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* <td>0xFF</td>
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* <td>255</td>
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* </tr>
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* <tr>
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* <td>16-bit</td>
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* <td>0xFFFF</td>
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* <td>65,535</td>
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* </tr>
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* <tr>
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* <td>32-bit</td>
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* <td>0xFFFFFFFF</td>
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* <td>4,294,967,295</td>
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* </tr>
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* </table>
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*
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* When using the counter in 16- or 32-bit count mode, Compare Capture
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* register 0 (CC0) is used to store the period value when running in PWM
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* generation match mode.
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*
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* When using 32-bit counter size, two 16-bit counters are chained together
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* in a cascade formation. Except in SAM D09/D10/D11. Even numbered TC modules
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* (e.g. TC0, TC2) can be configured as 32-bit counters. The odd numbered
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* counters will act as slaves to the even numbered masters, and will not
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* be reconfigurable until the master timer is disabled. The pairing of timer
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* modules for 32-bit mode is shown in \ref asfdoc_sam0_tc_module_ms_pairs
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* "the table below".
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*
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* \anchor asfdoc_sam0_tc_module_ms_pairs
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* <table>
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* <caption>TC Master and Slave Module Pairings</caption>
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* <tr>
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* <th>Master TC module</th>
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* <th>Slave TC module</th>
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* </tr>
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* <tr>
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* <td>TC0</td>
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* <td>TC1</td>
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* </tr>
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* <tr>
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* <td>TC2</td>
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* <td>TC3</td>
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* </tr>
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* <tr>
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* <td>...</td>
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* <td>...</td>
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* </tr>
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* <tr>
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* <td>TCn-1</td>
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* <td>TCn</td>
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* </tr>
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* </table>
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*
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* In SAM D09/D10/D11, odd numbered TC modules (e.g. TC1) can be configured as 32-bit
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* counters. The even numbered (e.g. TC2) counters will act as slaves to the odd
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* numbered masters.
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*
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* \subsection asfdoc_sam0_tc_module_overview_clock Clock Settings
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_clock_selection Clock Selection
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* Each TC peripheral is clocked asynchronously to the system clock by a GCLK
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* (Generic Clock) channel. The GCLK channel connects to any of the GCLK
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* generators. The GCLK generators are configured to use one of the available
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* clock sources on the system such as internal oscillator, external crystals,
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* etc. See the \ref asfdoc_sam0_system_clock_group "Generic Clock driver"
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*for
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* more information.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_clock_prescaler Prescaler
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* Each TC module in the SAM has its own individual clock prescaler, which
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* can be used to divide the input clock frequency used in the counter. This
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* prescaler only scales the clock used to provide clock pulses for the counter
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* to count, and does not affect the digital register interface portion of
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* the module, thus the timer registers will synchronize to the raw GCLK
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* frequency input to the module.
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*
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* As a result of this, when selecting a GCLK frequency and timer prescaler
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* value the user application should consider both the timer resolution
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* required and the synchronization frequency, to avoid lengthy
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* synchronization times of the module if a very slow GCLK frequency is fed
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* into the TC module. It is preferable to use a higher module GCLK frequency
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* as the input to the timer, and prescale this down as much as possible to
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* obtain a suitable counter frequency in latency-sensitive applications.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_clock_reloading Reloading
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* Timer modules also contain a configurable reload action, used when a
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* re-trigger event occurs. Examples of a re-trigger event are the counter
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* reaching the maximum value when counting up, or when an event from the event
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* system tells the counter to re-trigger. The reload action determines if the
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* prescaler should be reset, and when this should happen. The counter will
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* always be reloaded with the value it is set to start counting from. The user
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* can choose between three different reload actions, described in
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* \ref asfdoc_sam0_tc_module_reload_act "the table below".
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*
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* \anchor asfdoc_sam0_tc_module_reload_act
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* <table>
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* <caption>TC Module Reload Actions</caption>
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* <tr>
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* <th>Reload action</th>
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* <th>Description</th>
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* </tr>
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* <tr>
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* <td>\ref TC_RELOAD_ACTION_GCLK </td>
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* <td>Reload TC counter value on next GCLK cycle. Leave prescaler
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* as-is.</td>
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* </tr>
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* <tr>
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* <td>\ref TC_RELOAD_ACTION_PRESC </td>
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* <td>Reloads TC counter value on next prescaler clock. Leave prescaler
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* as-is.</td>
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* </tr>
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* <tr>
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* <td> \ref TC_RELOAD_ACTION_RESYNC </td>
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* <td>Reload TC counter value on next GCLK cycle. Clear prescaler to
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* zero.</td>
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* </tr>
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* </table>
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*
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* The reload action to use will depend on the specific application being
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* implemented. One example is when an external trigger for a reload occurs; if
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* the TC uses the prescaler, the counter in the prescaler should not have a
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* value between zero and the division factor. The TC counter and the counter
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* in the prescaler should both start at zero. When the counter is set to
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* re-trigger when it reaches the maximum value on the other hand, this is not the
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* right option to use. In such a case it would be better if the prescaler is
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* left unaltered when the re-trigger happens, letting the counter reset on the
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* next GCLK cycle.
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*
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* \subsection asfdoc_sam0_tc_module_overview_compare_match Compare Match Operations
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* In compare match operation, Compare/Capture registers are used in comparison
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* with the counter value. When the timer's count value matches the value of a
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* compare channel, a user defined action can be taken.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_compare_match_timer Basic Timer
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*
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* A Basic Timer is a simple application where compare match operations are used
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* to determine when a specific period has elapsed. In Basic Timer operations,
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* one or more values in the module's Compare/Capture registers are used to
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* specify the time (as a number of prescaled GCLK cycles) when an action should
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* be taken by the microcontroller. This can be an Interrupt Service Routine
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* (ISR), event generator via the event system, or a software flag that is
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* polled via the user application.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_compare_match_wg Waveform Generation
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*
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* Waveform generation enables the TC module to generate square waves, or if
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* combined with an external passive low-pass filter; analog waveforms.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_compare_match_wg_pwm Waveform Generation - PWM
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*
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* Pulse width modulation is a form of waveform generation and a signalling
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* technique that can be useful in many situations. When PWM mode is used,
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* a digital pulse train with a configurable frequency and duty cycle can be
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* generated by the TC module and output to a GPIO pin of the device.
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*
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* Often PWM is used to communicate a control or information parameter to an
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* external circuit or component. Differing impedances of the source generator
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* and sink receiver circuits are less of an issue when using PWM compared to
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* using an analog voltage value, as noise will not generally affect the
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* signal's integrity to a meaningful extent.
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*
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* \ref asfdoc_sam0_tc_module_pwm_normal_diag "The figure below" illustrates
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* operations and different states of the counter and its output when running
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* the counter in PWM normal mode. As can be seen, the TOP value is unchanged
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* and is set to MAX. The compare match value is changed at several points to
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* illustrate the resulting waveform output changes. The PWM output is set to
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* normal (i.e. non-inverted) output mode.
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*
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* \anchor asfdoc_sam0_tc_module_pwm_normal_diag
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* \image html pwm_normal_ex.svg "Example of PWM in Normal Mode, and Different Counter Operations"
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*
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*
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* In \ref asfdoc_sam0_tc_module_pwm_match_diag "the figure below", the
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* counter is set to generate PWM in Match mode. The PWM output is inverted via
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* the appropriate configuration option in the TC driver configuration
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* structure. In this example, the counter value is changed once, but the
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* compare match value is kept unchanged. As can be seen, it is possible to
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* change the TOP value when running in PWM match mode.
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*
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* \anchor asfdoc_sam0_tc_module_pwm_match_diag
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* \image html pwm_match_ex.svg "Example of PWM in Match Mode and Different Counter Operations"
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_compare_match_wg_freq Waveform Generation - Frequency
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*
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* Frequency Generation mode is in many ways identical to PWM
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* generation. However, in Frequency Generation a toggle only occurs
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* on the output when a match on a capture channels occurs. When the
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* match is made, the timer value is reset, resulting in a variable
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* frequency square wave with a fixed 50% duty cycle.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_compare_match_capt Capture Operations
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*
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* In capture operations, any event from the event system or a pin change can
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* trigger a capture of the counter value. This captured counter value can be
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* used as a timestamp for the event, or it can be used in frequency and pulse
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* width capture.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_compare_match_capt_event_capture Capture Operations - Event
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*
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* Event capture is a simple use of the capture functionality,
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* designed to create timestamps for specific events. When the TC
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* module's input capture pin is externally toggled, the current timer
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* count value is copied into a buffered register which can then be
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* read out by the user application.
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*
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* Note that when performing any capture operation, there is a risk that the
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* counter reaches its top value (MAX) when counting up, or the bottom value
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* (zero) when counting down, before the capture event occurs. This can distort
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* the result, making event timestamps to appear shorter than reality; the
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* user application should check for timer overflow when reading a capture
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* result in order to detect this situation and perform an appropriate
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* adjustment.
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*
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* Before checking for a new capture, \ref TC_STATUS_COUNT_OVERFLOW
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* should be checked. The response to an overflow error is left to the user
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* application, however it may be necessary to clear both the capture overflow
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* flag and the capture flag upon each capture reading.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_compare_match_capt_pwc Capture Operations - Pulse Width
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*
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* Pulse Width Capture mode makes it possible to measure the pulse width and
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* period of PWM signals. This mode uses two capture channels of the counter.
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* This means that the counter module used for Pulse Width Capture can not be
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* used for any other purpose. There are two modes for pulse width capture;
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* Pulse Width Period (PWP) and Period Pulse Width (PPW). In PWP mode, capture
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* channel 0 is used for storing the pulse width and capture channel 1 stores
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* the observed period. While in PPW mode, the roles of the two capture channels
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* are reversed.
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*
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* As in the above example it is necessary to poll on interrupt flags to see
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* if a new capture has happened and check that a capture overflow error has
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* not occurred.
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*
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* \subsection asfdoc_sam0_tc_module_overview_oneshot One-shot Mode
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*
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* TC modules can be configured into a one-shot mode. When configured in this
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* manner, starting the timer will cause it to count until the next overflow
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* or underflow condition before automatically halting, waiting to be manually
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* triggered by the user application software or an event signal from the event
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* system.
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*
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* \subsubsection asfdoc_sam0_tc_module_overview_inversion Wave Generation Output Inversion
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*
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* The output of the wave generation can be inverted by hardware if desired,
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* resulting in the logically inverted value being output to the configured
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* device GPIO pin.
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*
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*
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* \section asfdoc_sam0_tc_special_considerations Special Considerations
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*
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* The number of capture compare registers in each TC module is dependent on
|
|
* the specific SAM device being used, and in some cases the counter size.
|
|
*
|
|
* The maximum amount of capture compare registers available in any SAM
|
|
* device is two when running in 32-bit mode and four in 8- and 16-bit modes.
|
|
*
|
|
*
|
|
* \section asfdoc_sam0_tc_extra_info Extra Information
|
|
*
|
|
* For extra information, see \ref asfdoc_sam0_tc_extra. This includes:
|
|
* - \ref asfdoc_sam0_tc_extra_acronyms
|
|
* - \ref asfdoc_sam0_tc_extra_dependencies
|
|
* - \ref asfdoc_sam0_tc_extra_errata
|
|
* - \ref asfdoc_sam0_tc_extra_history
|
|
*
|
|
*
|
|
* \section asfdoc_sam0_tc_examples Examples
|
|
*
|
|
* For a list of examples related to this driver, see
|
|
* \ref asfdoc_sam0_tc_exqsg.
|
|
*
|
|
* \section asfdoc_sam0_tc_api_overview API Overview
|
|
* @{
|
|
*/
|
|
|
|
#include <compiler.h>
|
|
#include <clock.h>
|
|
#include <gclk.h>
|
|
#include <pinmux.h>
|
|
|
|
/**
|
|
* Define port features set according to different device family
|
|
* @{
|
|
*/
|
|
#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30) || defined(__DOXYGEN__)
|
|
/** TC double buffered. */
|
|
# define FEATURE_TC_DOUBLE_BUFFERED
|
|
/** SYNCBUSY scheme version 2. */
|
|
# define FEATURE_TC_SYNCBUSY_SCHEME_VERSION_2
|
|
/** TC time stamp capture and pulse width capture. */
|
|
# define FEATURE_TC_STAMP_PW_CAPTURE
|
|
/** Read synchronization of COUNT. */
|
|
# define FEATURE_TC_READ_SYNC
|
|
/** I/O pin edge capture. */
|
|
# define FEATURE_TC_IO_CAPTURE
|
|
#endif
|
|
|
|
#if (SAML21XXXB) || (SAMR30) || defined(__DOXYGEN__)
|
|
/** Generate Direct Memory Access (DMA) triggers. */
|
|
# define FEATURE_TC_GENERATE_DMA_TRIGGER
|
|
#endif
|
|
/*@}*/
|
|
|
|
#if !defined(__DOXYGEN__)
|
|
#if SAMD20 || SAML21 || SAML22 || SAMC20 || SAMC21 || SAMR30
|
|
# define TC_INSTANCE_OFFSET 0
|
|
#endif
|
|
#if SAMD21 || SAMR21 || SAMDA1
|
|
# define TC_INSTANCE_OFFSET 3
|
|
#endif
|
|
#if SAMD09 || SAMD10 || SAMD11
|
|
# define TC_INSTANCE_OFFSET 1
|
|
#endif
|
|
|
|
#if SAMD20
|
|
# define NUMBER_OF_COMPARE_CAPTURE_CHANNELS TC0_CC8_NUM
|
|
#elif SAML21 || SAML22 || SAMC20 || SAMC21 || SAMR30
|
|
# define NUMBER_OF_COMPARE_CAPTURE_CHANNELS TC0_CC_NUM
|
|
#elif SAMD09 || SAMD10 || SAMD11
|
|
# define NUMBER_OF_COMPARE_CAPTURE_CHANNELS TC1_CC8_NUM
|
|
#else
|
|
# define NUMBER_OF_COMPARE_CAPTURE_CHANNELS TC3_CC8_NUM
|
|
/* Same number for 8-, 16- or 32-bit TC and all TC instances */
|
|
#endif
|
|
|
|
/** TC Instance MAX ID Number. */
|
|
#if SAMD20E || SAMD20G || SAMD21G || SAMD21E || SAMR21
|
|
# if SAMD21GXXL
|
|
# define TC_INST_MAX_ID 7
|
|
# else
|
|
# define TC_INST_MAX_ID 5
|
|
# endif
|
|
#elif SAML21 || SAMC20 || SAMC21 || SAMR30
|
|
# define TC_INST_MAX_ID 4
|
|
#elif SAML22
|
|
# define TC_INST_MAX_ID 3
|
|
#elif SAMD09 || SAMD10 || SAMD11
|
|
# define TC_INST_MAX_ID 2
|
|
#else
|
|
# define TC_INST_MAX_ID 7
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if TC_ASYNC == true
|
|
# include <system_interrupt.h>
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#if TC_ASYNC == true
|
|
/** Enum for the possible callback types for the TC module. */
|
|
enum tc_callback {
|
|
/** Callback for TC overflow */
|
|
TC_CALLBACK_OVERFLOW,
|
|
/** Callback for capture overflow error */
|
|
TC_CALLBACK_ERROR,
|
|
/** Callback for capture compare channel 0 */
|
|
TC_CALLBACK_CC_CHANNEL0,
|
|
/** Callback for capture compare channel 1 */
|
|
TC_CALLBACK_CC_CHANNEL1,
|
|
# if !defined(__DOXYGEN__)
|
|
/** Number of available callbacks */
|
|
TC_CALLBACK_N,
|
|
# endif
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* \name Module Status Flags
|
|
*
|
|
* TC status flags, returned by \ref tc_get_status() and cleared by
|
|
* \ref tc_clear_status().
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/** Timer channel 0 has matched against its compare value, or has captured a
|
|
* new value.
|
|
*/
|
|
#define TC_STATUS_CHANNEL_0_MATCH (1UL << 0)
|
|
|
|
/** Timer channel 1 has matched against its compare value, or has captured a
|
|
* new value.
|
|
*/
|
|
#define TC_STATUS_CHANNEL_1_MATCH (1UL << 1)
|
|
|
|
/** Timer register synchronization has completed, and the synchronized count
|
|
* value may be read.
|
|
*/
|
|
#define TC_STATUS_SYNC_READY (1UL << 2)
|
|
|
|
/** A new value was captured before the previous value was read, resulting in
|
|
* lost data.
|
|
*/
|
|
#define TC_STATUS_CAPTURE_OVERFLOW (1UL << 3)
|
|
|
|
/** The timer count value has overflowed from its maximum value to its minimum
|
|
* when counting upward, or from its minimum value to its maximum when
|
|
* counting downward.
|
|
*/
|
|
#define TC_STATUS_COUNT_OVERFLOW (1UL << 4)
|
|
|
|
#ifdef FEATURE_TC_DOUBLE_BUFFERED
|
|
/** Channel 0 compare or capture buffer valid. */
|
|
#define TC_STATUS_CHN0_BUFFER_VALID (1UL << 5)
|
|
/** Channel 1 compare or capture buffer valid. */
|
|
#define TC_STATUS_CHN1_BUFFER_VALID (1UL << 6)
|
|
/** Period buffer valid. */
|
|
#define TC_STATUS_PERIOD_BUFFER_VALID (1UL << 7)
|
|
#endif
|
|
/** @} */
|
|
|
|
/**
|
|
* \brief Index of the compare capture channels.
|
|
*
|
|
* This enum is used to specify which capture/compare channel to do
|
|
* operations on.
|
|
*/
|
|
enum tc_compare_capture_channel {
|
|
/** Index of compare capture channel 0 */
|
|
TC_COMPARE_CAPTURE_CHANNEL_0,
|
|
/** Index of compare capture channel 1 */
|
|
TC_COMPARE_CAPTURE_CHANNEL_1,
|
|
};
|
|
|
|
/**
|
|
* \name TC Wave Generation Mode
|
|
*
|
|
* @{
|
|
*/
|
|
#if SAML21 || SAML22 || SAMC20 || SAMC21 || SAMR30
|
|
/** TC wave generation mode: normal frequency. */
|
|
#define TC_WAVE_GENERATION_NORMAL_FREQ_MODE TC_WAVE_WAVEGEN_NFRQ
|
|
/** TC wave generation mode: match frequency. */
|
|
#define TC_WAVE_GENERATION_MATCH_FREQ_MODE TC_WAVE_WAVEGEN_MFRQ
|
|
/** TC wave generation mode: normal PWM. */
|
|
#define TC_WAVE_GENERATION_NORMAL_PWM_MODE TC_WAVE_WAVEGEN_NPWM
|
|
/** TC wave generation mode: match PWM. */
|
|
#define TC_WAVE_GENERATION_MATCH_PWM_MODE TC_WAVE_WAVEGEN_MPWM
|
|
#else
|
|
/** TC wave generation mode: normal frequency. */
|
|
#define TC_WAVE_GENERATION_NORMAL_FREQ_MODE TC_CTRLA_WAVEGEN_NFRQ
|
|
/** TC wave generation mode: match frequency. */
|
|
#define TC_WAVE_GENERATION_MATCH_FREQ_MODE TC_CTRLA_WAVEGEN_MFRQ
|
|
/** TC wave generation mode: normal PWM. */
|
|
#define TC_WAVE_GENERATION_NORMAL_PWM_MODE TC_CTRLA_WAVEGEN_NPWM
|
|
/** TC wave generation mode: match PWM. */
|
|
#define TC_WAVE_GENERATION_MATCH_PWM_MODE TC_CTRLA_WAVEGEN_MPWM
|
|
#endif
|
|
/** @} */
|
|
|
|
/**
|
|
* \brief TC wave generation mode enum.
|
|
*
|
|
* This enum is used to select which mode to run the wave
|
|
* generation in.
|
|
*
|
|
*/
|
|
enum tc_wave_generation {
|
|
/** Top is maximum, except in 8-bit counter size where it is the PER
|
|
* register
|
|
*/
|
|
TC_WAVE_GENERATION_NORMAL_FREQ = TC_WAVE_GENERATION_NORMAL_FREQ_MODE,
|
|
|
|
/** Top is CC0, except in 8-bit counter size where it is the PER
|
|
* register
|
|
*/
|
|
TC_WAVE_GENERATION_MATCH_FREQ = TC_WAVE_GENERATION_MATCH_FREQ_MODE,
|
|
|
|
/** Top is maximum, except in 8-bit counter size where it is the PER
|
|
* register
|
|
*/
|
|
TC_WAVE_GENERATION_NORMAL_PWM = TC_WAVE_GENERATION_NORMAL_PWM_MODE,
|
|
|
|
/** Top is CC0, except in 8-bit counter size where it is the PER
|
|
* register
|
|
*/
|
|
TC_WAVE_GENERATION_MATCH_PWM = TC_WAVE_GENERATION_MATCH_PWM_MODE,
|
|
};
|
|
|
|
/**
|
|
* \brief Specifies if the counter is 8-, 16-, or 32-bit.
|
|
*
|
|
* This enum specifies the maximum value it is possible to count to.
|
|
*/
|
|
enum tc_counter_size {
|
|
/** The counter's maximum value is 0xFF, the period register is
|
|
* available to be used as top value
|
|
*/
|
|
TC_COUNTER_SIZE_8BIT = TC_CTRLA_MODE_COUNT8,
|
|
|
|
/** The counter's maximum value is 0xFFFF. There is no separate
|
|
* period register, to modify top one of the capture compare
|
|
* registers has to be used. This limits the amount of
|
|
* available channels.
|
|
*/
|
|
TC_COUNTER_SIZE_16BIT = TC_CTRLA_MODE_COUNT16,
|
|
|
|
/** The counter's maximum value is 0xFFFFFFFF. There is no separate
|
|
* period register, to modify top one of the capture compare
|
|
* registers has to be used. This limits the amount of
|
|
* available channels.
|
|
*/
|
|
TC_COUNTER_SIZE_32BIT = TC_CTRLA_MODE_COUNT32,
|
|
};
|
|
|
|
/**
|
|
* \brief TC Counter reload action enum.
|
|
*
|
|
* This enum specify how the counter and prescaler should reload.
|
|
*/
|
|
enum tc_reload_action {
|
|
/** The counter is reloaded/reset on the next GCLK and starts
|
|
* counting on the prescaler clock
|
|
*/
|
|
TC_RELOAD_ACTION_GCLK = TC_CTRLA_PRESCSYNC_GCLK,
|
|
|
|
/** The counter is reloaded/reset on the next prescaler clock
|
|
*/
|
|
TC_RELOAD_ACTION_PRESC = TC_CTRLA_PRESCSYNC_PRESC,
|
|
|
|
/** The counter is reloaded/reset on the next GCLK, and the
|
|
* prescaler is restarted as well
|
|
*/
|
|
TC_RELOAD_ACTION_RESYNC = TC_CTRLA_PRESCSYNC_RESYNC,
|
|
};
|
|
|
|
/**
|
|
* \brief TC clock prescaler values.
|
|
*
|
|
* This enum is used to choose the clock prescaler
|
|
* configuration. The prescaler divides the clock frequency of the TC
|
|
* module to make the counter count slower.
|
|
*/
|
|
enum tc_clock_prescaler {
|
|
/** Divide clock by 1 */
|
|
TC_CLOCK_PRESCALER_DIV1 = TC_CTRLA_PRESCALER(0),
|
|
/** Divide clock by 2 */
|
|
TC_CLOCK_PRESCALER_DIV2 = TC_CTRLA_PRESCALER(1),
|
|
/** Divide clock by 4 */
|
|
TC_CLOCK_PRESCALER_DIV4 = TC_CTRLA_PRESCALER(2),
|
|
/** Divide clock by 8 */
|
|
TC_CLOCK_PRESCALER_DIV8 = TC_CTRLA_PRESCALER(3),
|
|
/** Divide clock by 16 */
|
|
TC_CLOCK_PRESCALER_DIV16 = TC_CTRLA_PRESCALER(4),
|
|
/** Divide clock by 64 */
|
|
TC_CLOCK_PRESCALER_DIV64 = TC_CTRLA_PRESCALER(5),
|
|
/** Divide clock by 256 */
|
|
TC_CLOCK_PRESCALER_DIV256 = TC_CTRLA_PRESCALER(6),
|
|
/** Divide clock by 1024 */
|
|
TC_CLOCK_PRESCALER_DIV1024 = TC_CTRLA_PRESCALER(7),
|
|
};
|
|
|
|
/**
|
|
* \brief TC module count direction.
|
|
*
|
|
* Timer/Counter count direction.
|
|
*/
|
|
enum tc_count_direction {
|
|
/** Timer should count upward from zero to MAX */
|
|
TC_COUNT_DIRECTION_UP,
|
|
|
|
/** Timer should count downward to zero from MAX */
|
|
TC_COUNT_DIRECTION_DOWN,
|
|
};
|
|
|
|
/**
|
|
* \name Waveform Inversion Mode
|
|
*
|
|
* @{
|
|
*/
|
|
#if SAML21 || SAML22 || SAMC20 || SAMC21 || SAMR30
|
|
/** Waveform inversion CC0 mode. */
|
|
#define TC_WAVEFORM_INVERT_CC0_MODE TC_DRVCTRL_INVEN(1)
|
|
/** Waveform inversion CC1 mode. */
|
|
#define TC_WAVEFORM_INVERT_CC1_MODE TC_DRVCTRL_INVEN(2)
|
|
#else
|
|
/** Waveform inversion CC0 mode. */
|
|
#define TC_WAVEFORM_INVERT_CC0_MODE TC_CTRLC_INVEN(1)
|
|
/** Waveform inversion CC1 mode. */
|
|
#define TC_WAVEFORM_INVERT_CC1_MODE TC_CTRLC_INVEN(2)
|
|
#endif
|
|
|
|
/**
|
|
* \brief Waveform inversion mode.
|
|
*
|
|
* Output waveform inversion mode.
|
|
*/
|
|
enum tc_waveform_invert_output {
|
|
/** No inversion of the waveform output */
|
|
TC_WAVEFORM_INVERT_OUTPUT_NONE = 0,
|
|
/** Invert output from compare channel 0 */
|
|
TC_WAVEFORM_INVERT_OUTPUT_CHANNEL_0 = TC_WAVEFORM_INVERT_CC0_MODE,
|
|
/** Invert output from compare channel 1 */
|
|
TC_WAVEFORM_INVERT_OUTPUT_CHANNEL_1 = TC_WAVEFORM_INVERT_CC1_MODE,
|
|
};
|
|
|
|
/**
|
|
* \brief Action to perform when the TC module is triggered by an event.
|
|
*
|
|
* Event action to perform when the module is triggered by an event.
|
|
*/
|
|
enum tc_event_action {
|
|
/** No event action */
|
|
TC_EVENT_ACTION_OFF = TC_EVCTRL_EVACT_OFF,
|
|
/** Re-trigger on event */
|
|
TC_EVENT_ACTION_RETRIGGER = TC_EVCTRL_EVACT_RETRIGGER,
|
|
/** Increment counter on event */
|
|
TC_EVENT_ACTION_INCREMENT_COUNTER = TC_EVCTRL_EVACT_COUNT,
|
|
/** Start counter on event */
|
|
TC_EVENT_ACTION_START = TC_EVCTRL_EVACT_START,
|
|
|
|
/** Store period in capture register 0, pulse width in capture
|
|
* register 1
|
|
*/
|
|
TC_EVENT_ACTION_PPW = TC_EVCTRL_EVACT_PPW,
|
|
|
|
/** Store pulse width in capture register 0, period in capture
|
|
* register 1
|
|
*/
|
|
TC_EVENT_ACTION_PWP = TC_EVCTRL_EVACT_PWP,
|
|
#ifdef FEATURE_TC_STAMP_PW_CAPTURE
|
|
/** Time stamp capture */
|
|
TC_EVENT_ACTION_STAMP = TC_EVCTRL_EVACT_STAMP,
|
|
/** Pulse width capture */
|
|
TC_EVENT_ACTION_PW = TC_EVCTRL_EVACT_PW,
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* \brief TC event enable/disable structure.
|
|
*
|
|
* Event flags for the \ref tc_enable_events() and \ref tc_disable_events().
|
|
*/
|
|
struct tc_events {
|
|
/** Generate an output event on a compare channel match */
|
|
bool generate_event_on_compare_channel
|
|
[NUMBER_OF_COMPARE_CAPTURE_CHANNELS];
|
|
/** Generate an output event on counter overflow */
|
|
bool generate_event_on_overflow;
|
|
/** Perform the configured event action when an incoming event is signalled */
|
|
bool on_event_perform_action;
|
|
/** Specifies if the input event source is inverted, when used in PWP or
|
|
* PPW event action modes
|
|
*/
|
|
bool invert_event_input;
|
|
/** Specifies which event to trigger if an event is triggered */
|
|
enum tc_event_action event_action;
|
|
};
|
|
|
|
/**
|
|
* \brief Configuration struct for TC module in 8-bit size counter mode.
|
|
*/
|
|
struct tc_8bit_config {
|
|
/** Initial timer count value */
|
|
uint8_t value;
|
|
/** Where to count to or from depending on the direction on the counter */
|
|
uint8_t period;
|
|
/** Value to be used for compare match on each channel */
|
|
uint8_t compare_capture_channel[NUMBER_OF_COMPARE_CAPTURE_CHANNELS];
|
|
};
|
|
|
|
/**
|
|
* \brief Configuration struct for TC module in 16-bit size counter mode.
|
|
*/
|
|
struct tc_16bit_config {
|
|
/** Initial timer count value */
|
|
uint16_t value;
|
|
/** Value to be used for compare match on each channel */
|
|
uint16_t compare_capture_channel[NUMBER_OF_COMPARE_CAPTURE_CHANNELS];
|
|
};
|
|
|
|
/**
|
|
* \brief Configuration struct for TC module in 32-bit size counter mode.
|
|
*/
|
|
struct tc_32bit_config {
|
|
/** Initial timer count value */
|
|
uint32_t value;
|
|
/** Value to be used for compare match on each channel */
|
|
uint32_t compare_capture_channel[NUMBER_OF_COMPARE_CAPTURE_CHANNELS];
|
|
};
|
|
|
|
/**
|
|
* \brief Configuration struct for TC module in 32-bit size counter mode.
|
|
*/
|
|
struct tc_pwm_channel {
|
|
/** When \c true, PWM output for the given channel is enabled */
|
|
bool enabled;
|
|
/** Specifies pin output for each channel */
|
|
uint32_t pin_out;
|
|
/** Specifies Multiplexer (MUX) setting for each output channel pin */
|
|
uint32_t pin_mux;
|
|
};
|
|
|
|
/**
|
|
* \brief TC configuration structure.
|
|
*
|
|
* Configuration struct for a TC instance. This structure should be
|
|
* initialized by the \ref tc_get_config_defaults function before being
|
|
* modified by the user application.
|
|
*/
|
|
struct tc_config {
|
|
/** GCLK generator used to clock the peripheral */
|
|
enum gclk_generator clock_source;
|
|
|
|
/** When \c true the module is enabled during standby */
|
|
bool run_in_standby;
|
|
#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30)
|
|
/** Run on demand */
|
|
bool on_demand;
|
|
#endif
|
|
/** Specifies either 8-, 16-, or 32-bit counter size */
|
|
enum tc_counter_size counter_size;
|
|
/** Specifies the prescaler value for GCLK_TC */
|
|
enum tc_clock_prescaler clock_prescaler;
|
|
/** Specifies which waveform generation mode to use */
|
|
enum tc_wave_generation wave_generation;
|
|
|
|
/** Specifies the reload or reset time of the counter and prescaler
|
|
* resynchronization on a re-trigger event for the TC
|
|
*/
|
|
enum tc_reload_action reload_action;
|
|
|
|
/** Specifies which channel(s) to invert the waveform on.
|
|
For SAM L21/L22/C20/C21, it's also used to invert I/O input pin. */
|
|
uint8_t waveform_invert_output;
|
|
|
|
/** Specifies which channel(s) to enable channel capture
|
|
* operation on
|
|
*/
|
|
bool enable_capture_on_channel[NUMBER_OF_COMPARE_CAPTURE_CHANNELS];
|
|
#ifdef FEATURE_TC_IO_CAPTURE
|
|
/** Specifies which channel(s) to enable I/O capture
|
|
* operation on
|
|
*/
|
|
bool enable_capture_on_IO[NUMBER_OF_COMPARE_CAPTURE_CHANNELS];
|
|
#endif
|
|
|
|
/** When \c true, one-shot will stop the TC on next hardware or software
|
|
* re-trigger event or overflow/underflow
|
|
*/
|
|
bool oneshot;
|
|
|
|
/** Specifies the direction for the TC to count */
|
|
enum tc_count_direction count_direction;
|
|
|
|
/** Specifies the PWM channel for TC */
|
|
struct tc_pwm_channel pwm_channel[NUMBER_OF_COMPARE_CAPTURE_CHANNELS];
|
|
|
|
/** Access the different counter size settings through this configuration member. */
|
|
union {
|
|
/** Struct for 8-bit specific timer configuration */
|
|
struct tc_8bit_config counter_8_bit;
|
|
/** Struct for 16-bit specific timer configuration */
|
|
struct tc_16bit_config counter_16_bit;
|
|
/** Struct for 32-bit specific timer configuration */
|
|
struct tc_32bit_config counter_32_bit;
|
|
};
|
|
|
|
#ifdef FEATURE_TC_DOUBLE_BUFFERED
|
|
/** Set to \c true to enable double buffering write. When enabled any write
|
|
* through \ref tc_set_top_value(), \ref tc_set_compare_value() and
|
|
* will direct to the buffer register as buffered
|
|
* value, and the buffered value will be committed to effective register
|
|
* on UPDATE condition, if update is not locked.
|
|
*/
|
|
bool double_buffering_enabled;
|
|
#endif
|
|
};
|
|
|
|
#if TC_ASYNC == true
|
|
/** Forward Declaration for the device instance. */
|
|
struct tc_module;
|
|
|
|
/** Type of the callback functions. */
|
|
typedef void (*tc_callback_t)(struct tc_module *const module);
|
|
#endif
|
|
|
|
/**
|
|
* \brief TC software device instance structure.
|
|
*
|
|
* TC software instance structure, used to retain software state information
|
|
* of an associated hardware module instance.
|
|
*
|
|
* \note The fields of this structure should not be altered by the user
|
|
* application; they are reserved for module-internal use only.
|
|
*/
|
|
struct tc_module {
|
|
#if !defined(__DOXYGEN__)
|
|
/** Hardware module pointer of the associated Timer/Counter peripheral */
|
|
Tc *hw;
|
|
|
|
/** Size of the initialized Timer/Counter module configuration */
|
|
enum tc_counter_size counter_size;
|
|
# if TC_ASYNC == true
|
|
/** Array of callbacks */
|
|
tc_callback_t callback[TC_CALLBACK_N];
|
|
/** Bit mask for callbacks registered */
|
|
uint8_t register_callback_mask;
|
|
/** Bit mask for callbacks enabled */
|
|
uint8_t enable_callback_mask;
|
|
# endif
|
|
#ifdef FEATURE_TC_DOUBLE_BUFFERED
|
|
/** Set to \c true to enable double buffering write */
|
|
bool double_buffering_enabled;
|
|
#endif
|
|
#endif
|
|
};
|
|
|
|
#if !defined(__DOXYGEN__)
|
|
uint8_t _tc_get_inst_index(
|
|
Tc *const hw);
|
|
#endif
|
|
|
|
/**
|
|
* \name Driver Initialization and Configuration
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Determines if the hardware module(s) are currently synchronizing to
|
|
* the bus.
|
|
*
|
|
* Checks to see if the underlying hardware peripheral module(s) are currently
|
|
* synchronizing across multiple clock domains to the hardware bus. This
|
|
* function can be used to delay further operations on a module until such time
|
|
* that it is ready, to prevent blocking delays for synchronization in the
|
|
* user application.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*
|
|
* \return Synchronization status of the underlying hardware module(s).
|
|
*
|
|
* \retval false If the module has completed synchronization
|
|
* \retval true If the module synchronization is ongoing
|
|
*/
|
|
static inline bool tc_is_syncing(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30)
|
|
return (tc_module->SYNCBUSY.reg);
|
|
#else
|
|
return (tc_module->STATUS.reg & TC_STATUS_SYNCBUSY);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* \brief Initializes config with predefined default values.
|
|
*
|
|
* This function will initialize a given TC configuration structure to
|
|
* a set of known default values. This function should be called on
|
|
* any new instance of the configuration structures before being
|
|
* modified by the user application.
|
|
*
|
|
* The default configuration is as follows:
|
|
* \li GCLK generator 0 (GCLK main) clock source
|
|
* \li 16-bit counter size on the counter
|
|
* \li No prescaler
|
|
* \li Normal frequency wave generation
|
|
* \li GCLK reload action
|
|
* \li Don't run in standby
|
|
* \li Don't run on demand for SAM L21/L22/C20/C21
|
|
* \li No inversion of waveform output
|
|
* \li No capture enabled
|
|
* \li No I/O capture enabled for SAM L21/L22/C20/C21
|
|
* \li No event input enabled
|
|
* \li Count upward
|
|
* \li Don't perform one-shot operations
|
|
* \li No event action
|
|
* \li No channel 0 PWM output
|
|
* \li No channel 1 PWM output
|
|
* \li Counter starts on 0
|
|
* \li Capture compare channel 0 set to 0
|
|
* \li Capture compare channel 1 set to 0
|
|
* \li No PWM pin output enabled
|
|
* \li Pin and MUX configuration not set
|
|
* \li Double buffer disabled (if have this feature)
|
|
*
|
|
* \param[out] config Pointer to a TC module configuration structure to set
|
|
*/
|
|
static inline void tc_get_config_defaults(
|
|
struct tc_config *const config)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(config);
|
|
|
|
/* Write default config to config struct */
|
|
config->clock_source = GCLK_GENERATOR_0;
|
|
config->counter_size = TC_COUNTER_SIZE_16BIT;
|
|
config->clock_prescaler = TC_CLOCK_PRESCALER_DIV1;
|
|
config->wave_generation = TC_WAVE_GENERATION_NORMAL_FREQ;
|
|
config->reload_action = TC_RELOAD_ACTION_GCLK;
|
|
config->run_in_standby = false;
|
|
#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30)
|
|
config->on_demand = false;
|
|
#endif
|
|
config->waveform_invert_output = TC_WAVEFORM_INVERT_OUTPUT_NONE;
|
|
config->enable_capture_on_channel[TC_COMPARE_CAPTURE_CHANNEL_0] = false;
|
|
config->enable_capture_on_channel[TC_COMPARE_CAPTURE_CHANNEL_1] = false;
|
|
#ifdef FEATURE_TC_IO_CAPTURE
|
|
config->enable_capture_on_IO[TC_COMPARE_CAPTURE_CHANNEL_0] = false;
|
|
config->enable_capture_on_IO[TC_COMPARE_CAPTURE_CHANNEL_1] = false;
|
|
#endif
|
|
|
|
config->count_direction = TC_COUNT_DIRECTION_UP;
|
|
config->oneshot = false;
|
|
|
|
config->pwm_channel[TC_COMPARE_CAPTURE_CHANNEL_0].enabled = false;
|
|
config->pwm_channel[TC_COMPARE_CAPTURE_CHANNEL_0].pin_out = 0;
|
|
config->pwm_channel[TC_COMPARE_CAPTURE_CHANNEL_0].pin_mux = 0;
|
|
|
|
config->pwm_channel[TC_COMPARE_CAPTURE_CHANNEL_1].enabled = false;
|
|
config->pwm_channel[TC_COMPARE_CAPTURE_CHANNEL_1].pin_out = 0;
|
|
config->pwm_channel[TC_COMPARE_CAPTURE_CHANNEL_1].pin_mux = 0;
|
|
|
|
config->counter_16_bit.value = 0x0000;
|
|
config->counter_16_bit.compare_capture_channel\
|
|
[TC_COMPARE_CAPTURE_CHANNEL_0] = 0x0000;
|
|
config->counter_16_bit.compare_capture_channel\
|
|
[TC_COMPARE_CAPTURE_CHANNEL_1] = 0x0000;
|
|
#ifdef FEATURE_TC_DOUBLE_BUFFERED
|
|
config->double_buffering_enabled = false;
|
|
#endif
|
|
|
|
}
|
|
|
|
enum status_code tc_init(
|
|
struct tc_module *const module_inst,
|
|
Tc *const hw,
|
|
const struct tc_config *const config);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Event Management
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Enables a TC module event input or output.
|
|
*
|
|
* Enables one or more input or output events to or from the TC module.
|
|
* See \ref tc_events for a list of events this module supports.
|
|
*
|
|
* \note Events cannot be altered while the module is enabled.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
* \param[in] events Struct containing flags of events to enable
|
|
*/
|
|
static inline void tc_enable_events(
|
|
struct tc_module *const module_inst,
|
|
struct tc_events *const events)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
Assert(events);
|
|
|
|
Tc *const tc_module = module_inst->hw;
|
|
|
|
uint32_t event_mask = 0;
|
|
|
|
if (events->invert_event_input == true) {
|
|
event_mask |= TC_EVCTRL_TCINV;
|
|
}
|
|
|
|
if (events->on_event_perform_action == true) {
|
|
event_mask |= TC_EVCTRL_TCEI;
|
|
}
|
|
|
|
if (events->generate_event_on_overflow == true) {
|
|
event_mask |= TC_EVCTRL_OVFEO;
|
|
}
|
|
|
|
for (uint8_t i = 0; i < NUMBER_OF_COMPARE_CAPTURE_CHANNELS; i++) {
|
|
if (events->generate_event_on_compare_channel[i] == true) {
|
|
event_mask |= (TC_EVCTRL_MCEO(1) << i);
|
|
}
|
|
}
|
|
|
|
tc_module->COUNT8.EVCTRL.reg |= event_mask | events->event_action;
|
|
}
|
|
|
|
/**
|
|
* \brief Disables a TC module event input or output.
|
|
*
|
|
* Disables one or more input or output events to or from the TC module.
|
|
* See \ref tc_events for a list of events this module supports.
|
|
*
|
|
* \note Events cannot be altered while the module is enabled.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
* \param[in] events Struct containing flags of events to disable
|
|
*/
|
|
static inline void tc_disable_events(
|
|
struct tc_module *const module_inst,
|
|
struct tc_events *const events)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
Assert(events);
|
|
|
|
Tc *const tc_module = module_inst->hw;
|
|
|
|
uint32_t event_mask = 0;
|
|
|
|
if (events->invert_event_input == true) {
|
|
event_mask |= TC_EVCTRL_TCINV;
|
|
}
|
|
|
|
if (events->on_event_perform_action == true) {
|
|
event_mask |= TC_EVCTRL_TCEI;
|
|
}
|
|
|
|
if (events->generate_event_on_overflow == true) {
|
|
event_mask |= TC_EVCTRL_OVFEO;
|
|
}
|
|
|
|
for (uint8_t i = 0; i < NUMBER_OF_COMPARE_CAPTURE_CHANNELS; i++) {
|
|
if (events->generate_event_on_compare_channel[i] == true) {
|
|
event_mask |= (TC_EVCTRL_MCEO(1) << i);
|
|
}
|
|
}
|
|
|
|
tc_module->COUNT8.EVCTRL.reg &= ~event_mask;
|
|
}
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Enable/Disable/Reset
|
|
* @{
|
|
*/
|
|
|
|
enum status_code tc_reset(
|
|
const struct tc_module *const module_inst);
|
|
|
|
/**
|
|
* \brief Enable the TC module.
|
|
*
|
|
* Enables a TC module that has been previously initialized. The counter will
|
|
* start when the counter is enabled.
|
|
*
|
|
* \note When the counter is configured to re-trigger on an event, the counter
|
|
* will not start until the start function is used.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*/
|
|
static inline void tc_enable(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Enable TC module */
|
|
tc_module->CTRLA.reg |= TC_CTRLA_ENABLE;
|
|
}
|
|
|
|
/**
|
|
* \brief Disables the TC module.
|
|
*
|
|
* Disables a TC module and stops the counter.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*/
|
|
static inline void tc_disable(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Disbale interrupt */
|
|
tc_module->INTENCLR.reg = TC_INTENCLR_MASK;
|
|
/* Clear interrupt flag */
|
|
tc_module->INTFLAG.reg = TC_INTFLAG_MASK;
|
|
|
|
/* Disable TC module */
|
|
tc_module->CTRLA.reg &= ~TC_CTRLA_ENABLE;
|
|
}
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Get/Set Count Value
|
|
* @{
|
|
*/
|
|
|
|
uint32_t tc_get_count_value(
|
|
const struct tc_module *const module_inst);
|
|
|
|
enum status_code tc_set_count_value(
|
|
const struct tc_module *const module_inst,
|
|
const uint32_t count);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Start/Stop Counter
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Stops the counter.
|
|
*
|
|
* This function will stop the counter. When the counter is stopped
|
|
* the value in the count value is set to 0 if the counter was
|
|
* counting up, or maximum if the counter was counting
|
|
* down when stopped.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*/
|
|
static inline void tc_stop_counter(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Write command to execute */
|
|
tc_module->CTRLBSET.reg = TC_CTRLBSET_CMD(TC_CTRLBSET_CMD_STOP_Val);
|
|
}
|
|
|
|
/**
|
|
* \brief Starts the counter.
|
|
*
|
|
* Starts or restarts an initialized TC module's counter.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*/
|
|
static inline void tc_start_counter(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Make certain that there are no conflicting commands in the register */
|
|
tc_module->CTRLBCLR.reg = TC_CTRLBCLR_CMD_NONE;
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Write command to execute */
|
|
tc_module->CTRLBSET.reg = TC_CTRLBSET_CMD(TC_CTRLBSET_CMD_RETRIGGER_Val);
|
|
}
|
|
|
|
/** @} */
|
|
|
|
#ifdef FEATURE_TC_DOUBLE_BUFFERED
|
|
/**
|
|
* \name Double Buffering
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Update double buffer.
|
|
*
|
|
* Update double buffer.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*/
|
|
static inline void tc_update_double_buffer(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Make certain that there are no conflicting commands in the register */
|
|
tc_module->CTRLBCLR.reg = TC_CTRLBCLR_CMD_NONE;
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Write command to execute */
|
|
tc_module->CTRLBSET.reg = TC_CTRLBSET_CMD(TC_CTRLBSET_CMD_UPDATE_Val);
|
|
}
|
|
/** @} */
|
|
#endif
|
|
|
|
#ifdef FEATURE_TC_READ_SYNC
|
|
/**
|
|
* \name Count Read Synchronization
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Read synchronization of COUNT.
|
|
*
|
|
* Read synchronization of COUNT.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*/
|
|
static inline void tc_sync_read_count(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Make certain that there are no conflicting commands in the register */
|
|
tc_module->CTRLBCLR.reg = TC_CTRLBCLR_CMD_NONE;
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Write command to execute */
|
|
tc_module->CTRLBSET.reg = TC_CTRLBSET_CMD(TC_CTRLBSET_CMD_READSYNC_Val);
|
|
}
|
|
/** @} */
|
|
#endif
|
|
|
|
#ifdef FEATURE_TC_GENERATE_DMA_TRIGGER
|
|
/**
|
|
* \name Generate TC DMA Triggers Command
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief TC DMA Trigger.
|
|
*
|
|
* TC DMA trigger command.
|
|
*
|
|
* \param[in] module_inst Pointer to the software module instance struct
|
|
*/
|
|
static inline void tc_dma_trigger_command(
|
|
const struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
/* Make certain that there are no conflicting commands in the register */
|
|
tc_module->CTRLBCLR.reg = TC_CTRLBCLR_CMD_NONE;
|
|
|
|
while (tc_is_syncing(module_inst)) {
|
|
/* Wait for sync */
|
|
}
|
|
|
|
#if (SAMC20) || (SAMC21) || (SAML22) || (SAML21XXXB) || (SAMR30)
|
|
/* Write command to execute */
|
|
tc_module->CTRLBSET.reg = TC_CTRLBSET_CMD(TC_CTRLBSET_CMD_DMAOS_Val);
|
|
#endif
|
|
}
|
|
/** @} */
|
|
#endif
|
|
|
|
/**
|
|
* \name Get Capture Set Compare
|
|
* @{
|
|
*/
|
|
|
|
uint32_t tc_get_capture_value(
|
|
const struct tc_module *const module_inst,
|
|
const enum tc_compare_capture_channel channel_index);
|
|
|
|
enum status_code tc_set_compare_value(
|
|
const struct tc_module *const module_inst,
|
|
const enum tc_compare_capture_channel channel_index,
|
|
const uint32_t compare_value);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Set Top Value
|
|
* @{
|
|
*/
|
|
|
|
enum status_code tc_set_top_value(
|
|
const struct tc_module *const module_inst,
|
|
const uint32_t top_value);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Status Management
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Retrieves the current module status.
|
|
*
|
|
* Retrieves the status of the module, giving overall state information.
|
|
*
|
|
* \param[in] module_inst Pointer to the TC software instance struct
|
|
*
|
|
* \return Bitmask of \c TC_STATUS_* flags.
|
|
*
|
|
* \retval TC_STATUS_CHANNEL_0_MATCH Timer channel 0 compare/capture match
|
|
* \retval TC_STATUS_CHANNEL_1_MATCH Timer channel 1 compare/capture match
|
|
* \retval TC_STATUS_SYNC_READY Timer read synchronization has completed
|
|
* \retval TC_STATUS_CAPTURE_OVERFLOW Timer capture data has overflowed
|
|
* \retval TC_STATUS_COUNT_OVERFLOW Timer count value has overflowed
|
|
* \retval TC_STATUS_CHN0_BUFFER_VALID Timer count channel 0 compare/capture buffer valid
|
|
* \retval TC_STATUS_CHN1_BUFFER_VALID Timer count channel 1 compare/capture buffer valid
|
|
* \retval TC_STATUS_PERIOD_BUFFER_VALID Timer count period buffer valid
|
|
*/
|
|
static inline uint32_t tc_get_status(
|
|
struct tc_module *const module_inst)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
uint32_t int_flags = tc_module->INTFLAG.reg;
|
|
|
|
uint32_t status_flags = 0;
|
|
|
|
/* Check for TC channel 0 match */
|
|
if (int_flags & TC_INTFLAG_MC(1)) {
|
|
status_flags |= TC_STATUS_CHANNEL_0_MATCH;
|
|
}
|
|
|
|
/* Check for TC channel 1 match */
|
|
if (int_flags & TC_INTFLAG_MC(2)) {
|
|
status_flags |= TC_STATUS_CHANNEL_1_MATCH;
|
|
}
|
|
|
|
#if !defined(FEATURE_TC_SYNCBUSY_SCHEME_VERSION_2)
|
|
/* Check for TC read synchronization ready */
|
|
if (int_flags & TC_INTFLAG_SYNCRDY) {
|
|
status_flags |= TC_STATUS_SYNC_READY;
|
|
}
|
|
#endif
|
|
|
|
/* Check for TC capture overflow */
|
|
if (int_flags & TC_INTFLAG_ERR) {
|
|
status_flags |= TC_STATUS_CAPTURE_OVERFLOW;
|
|
}
|
|
|
|
/* Check for TC count overflow */
|
|
if (int_flags & TC_INTFLAG_OVF) {
|
|
status_flags |= TC_STATUS_COUNT_OVERFLOW;
|
|
}
|
|
#ifdef FEATURE_TC_DOUBLE_BUFFERED
|
|
uint8_t double_buffer_valid_status = tc_module->STATUS.reg;
|
|
|
|
/* Check channel 0 compare or capture buffer valid */
|
|
if (double_buffer_valid_status & TC_STATUS_CCBUFV0) {
|
|
status_flags |= TC_STATUS_CHN0_BUFFER_VALID;
|
|
}
|
|
/* Check channel 0 compare or capture buffer valid */
|
|
if (double_buffer_valid_status & TC_STATUS_CCBUFV1) {
|
|
status_flags |= TC_STATUS_CHN1_BUFFER_VALID;
|
|
}
|
|
/* Check period buffer valid */
|
|
if (double_buffer_valid_status & TC_STATUS_PERBUFV) {
|
|
status_flags |= TC_STATUS_PERIOD_BUFFER_VALID;
|
|
}
|
|
#endif
|
|
|
|
return status_flags;
|
|
}
|
|
|
|
/**
|
|
* \brief Clears a module status flag.
|
|
*
|
|
* Clears the given status flag of the module.
|
|
*
|
|
* \param[in] module_inst Pointer to the TC software instance struct
|
|
* \param[in] status_flags Bitmask of \c TC_STATUS_* flags to clear
|
|
*/
|
|
static inline void tc_clear_status(
|
|
struct tc_module *const module_inst,
|
|
const uint32_t status_flags)
|
|
{
|
|
/* Sanity check arguments */
|
|
Assert(module_inst);
|
|
Assert(module_inst->hw);
|
|
|
|
/* Get a pointer to the module's hardware instance */
|
|
TcCount8 *const tc_module = &(module_inst->hw->COUNT8);
|
|
|
|
uint32_t int_flags = 0;
|
|
|
|
/* Check for TC channel 0 match */
|
|
if (status_flags & TC_STATUS_CHANNEL_0_MATCH) {
|
|
int_flags |= TC_INTFLAG_MC(1);
|
|
}
|
|
|
|
/* Check for TC channel 1 match */
|
|
if (status_flags & TC_STATUS_CHANNEL_1_MATCH) {
|
|
int_flags |= TC_INTFLAG_MC(2);
|
|
}
|
|
|
|
#if !defined(FEATURE_TC_SYNCBUSY_SCHEME_VERSION_2)
|
|
/* Check for TC read synchronization ready */
|
|
if (status_flags & TC_STATUS_SYNC_READY) {
|
|
int_flags |= TC_INTFLAG_SYNCRDY;
|
|
}
|
|
#endif
|
|
|
|
/* Check for TC capture overflow */
|
|
if (status_flags & TC_STATUS_CAPTURE_OVERFLOW) {
|
|
int_flags |= TC_INTFLAG_ERR;
|
|
}
|
|
|
|
/* Check for TC count overflow */
|
|
if (status_flags & TC_STATUS_COUNT_OVERFLOW) {
|
|
int_flags |= TC_INTFLAG_OVF;
|
|
}
|
|
|
|
/* Clear interrupt flag */
|
|
tc_module->INTFLAG.reg = int_flags;
|
|
}
|
|
|
|
/** @} */
|
|
|
|
/** @} */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* \page asfdoc_sam0_tc_extra Extra Information for TC Driver
|
|
*
|
|
* \section asfdoc_sam0_tc_extra_acronyms Acronyms
|
|
* The table below presents the acronyms used in this module:
|
|
*
|
|
* <table>
|
|
* <tr>
|
|
* <th>Acronym</th>
|
|
* <th>Description</th>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>DMA</td>
|
|
* <td>Direct Memory Access</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>TC</td>
|
|
* <td>Timer Counter</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>PWM</td>
|
|
* <td>Pulse Width Modulation</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>PWP</td>
|
|
* <td>Pulse Width Period</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>PPW</td>
|
|
* <td>Period Pulse Width</td>
|
|
* </tr>
|
|
* </table>
|
|
*
|
|
*
|
|
* \section asfdoc_sam0_tc_extra_dependencies Dependencies
|
|
* This driver has the following dependencies:
|
|
*
|
|
* - \ref asfdoc_sam0_system_pinmux_group "System Pin Multiplexer Driver"
|
|
*
|
|
*
|
|
* \section asfdoc_sam0_tc_extra_errata Errata
|
|
* There are no errata related to this driver.
|
|
*
|
|
*
|
|
* \section asfdoc_sam0_tc_extra_history Module History
|
|
* An overview of the module history is presented in the table below, with
|
|
* details on the enhancements and fixes made to the module since its first
|
|
* release. The current version of this corresponds to the newest version in
|
|
* the table.
|
|
*
|
|
* <table>
|
|
* <tr>
|
|
* <th>Changelog</th>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>Added support for SAM D21 and do some modifications as below:
|
|
* \li Clean up in the configuration structure, the counter size
|
|
* setting specific registers is accessed through the counter_8_bit,
|
|
* counter_16_bit, and counter_32_bit structures
|
|
* \li All event related settings moved into the tc_event structure </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>Added automatic digital clock interface enable for the slave TC
|
|
* module when a timer is initialized in 32-bit mode</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>Initial release</td>
|
|
* </tr>
|
|
* </table>
|
|
*/
|
|
|
|
/**
|
|
* \page asfdoc_sam0_tc_exqsg Examples for TC Driver
|
|
*
|
|
* This is a list of the available Quick Start guides (QSGs) and example
|
|
* applications for \ref asfdoc_sam0_tc_group. QSGs are simple examples with
|
|
* step-by-step instructions to configure and use this driver in a selection of
|
|
* use cases. Note that QSGs can be compiled as a standalone application or be
|
|
* added to the user application.
|
|
*
|
|
* - \subpage asfdoc_sam0_tc_basic_use_case
|
|
* - \subpage asfdoc_sam0_tc_macth_freq_use_case
|
|
* \if TC_CALLBACK_MODE
|
|
* - \subpage asfdoc_sam0_tc_timer_use_case
|
|
* - \subpage asfdoc_sam0_tc_callback_use_case
|
|
* \endif
|
|
* - \subpage asfdoc_sam0_tc_dma_use_case
|
|
*
|
|
* \page asfdoc_sam0_tc_document_revision_history Document Revision History
|
|
*
|
|
* <table>
|
|
* <tr>
|
|
* <th>Doc. Rev.</td>
|
|
* <th>Date</td>
|
|
* <th>Comments</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>42123E</td>
|
|
* <td>12/2015</td>
|
|
* <td>Added support for SAM L21/L22, SAM DA1, SAM D09, and SAM C21</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>42123D</td>
|
|
* <td>12/2014</td>
|
|
* <td>Added timer use case.
|
|
* Added support for SAM R21 and SAM D10/D11</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>42123C</td>
|
|
* <td>01/2014</td>
|
|
* <td>Added support for SAM D21</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>42123B</td>
|
|
* <td>06/2013</td>
|
|
* <td>Corrected documentation typos</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>42123A</td>
|
|
* <td>06/2013</td>
|
|
* <td>Initial document release</td>
|
|
* </tr>
|
|
* </table>
|
|
*/
|
|
|
|
#endif /* TC_H_INCLUDED */
|