200 lines
6.3 KiB
C
200 lines
6.3 KiB
C
/**
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* \file
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*
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* \brief SAM TC - Timer Counter Callback 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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#include "tc_interrupt.h"
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void *_tc_instances[TC_INST_NUM];
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void _tc_interrupt_handler(uint8_t instance);
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/**
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* \brief Registers a callback.
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*
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* Registers a callback function which is implemented by the user.
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*
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* \note The callback must be enabled by \ref tc_enable_callback,
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* in order for the interrupt handler to call it when the conditions for the
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* callback type is met.
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*
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* \param[in] module Pointer to TC software instance struct
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* \param[in] callback_func Pointer to callback function
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* \param[in] callback_type Callback type given by an enum
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*/
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enum status_code tc_register_callback(
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struct tc_module *const module,
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tc_callback_t callback_func,
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const enum tc_callback callback_type)
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{
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/* Sanity check arguments */
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Assert(module);
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Assert(callback_func);
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/* Register callback function */
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module->callback[callback_type] = callback_func;
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/* Set the bit corresponding to the callback_type */
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if (callback_type == TC_CALLBACK_CC_CHANNEL0) {
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module->register_callback_mask |= TC_INTFLAG_MC(1);
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}
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else if (callback_type == TC_CALLBACK_CC_CHANNEL1) {
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module->register_callback_mask |= TC_INTFLAG_MC(2);
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}
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else {
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module->register_callback_mask |= (1 << callback_type);
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}
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return STATUS_OK;
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}
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/**
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* \brief Unregisters a callback.
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*
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* Unregisters a callback function implemented by the user. The callback should be
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* disabled before it is unregistered.
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*
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* \param[in] module Pointer to TC software instance struct
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* \param[in] callback_type Callback type given by an enum
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*/
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enum status_code tc_unregister_callback(
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struct tc_module *const module,
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const enum tc_callback callback_type)
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{
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/* Sanity check arguments */
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Assert(module);
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/* Unregister callback function */
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module->callback[callback_type] = NULL;
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/* Clear the bit corresponding to the callback_type */
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if (callback_type == TC_CALLBACK_CC_CHANNEL0) {
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module->register_callback_mask &= ~TC_INTFLAG_MC(1);
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}
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else if (callback_type == TC_CALLBACK_CC_CHANNEL1) {
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module->register_callback_mask &= ~TC_INTFLAG_MC(2);
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}
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else {
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module->register_callback_mask &= ~(1 << callback_type);
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}
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return STATUS_OK;
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}
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/**
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* \internal ISR handler for TC
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*
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* Auto-generate a set of interrupt handlers for each TC in the device.
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*/
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#define _TC_INTERRUPT_HANDLER(n, m) \
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void TC##n##_Handler(void) \
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{ \
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_tc_interrupt_handler(m); \
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}
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#if (SAML21E) || (SAML21G) || (SAMR30E) || (SAMR30G)
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_TC_INTERRUPT_HANDLER(0,0)
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_TC_INTERRUPT_HANDLER(1,1)
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_TC_INTERRUPT_HANDLER(4,2)
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#else
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MRECURSION(TC_INST_NUM, _TC_INTERRUPT_HANDLER, TC_INST_MAX_ID)
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#endif
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/**
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* \internal Interrupt Handler for TC module
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*
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* Handles interrupts as they occur, it will run the callback functions
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* that are registered and enabled.
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*
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* \param[in] instance ID of the TC instance calling the interrupt
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* handler
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*/
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void _tc_interrupt_handler(
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uint8_t instance)
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{
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/* Temporary variable */
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uint8_t interrupt_and_callback_status_mask;
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/* Get device instance from the look-up table */
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struct tc_module *module
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= (struct tc_module *)_tc_instances[instance];
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/* Read and mask interrupt flag register */
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interrupt_and_callback_status_mask = module->hw->COUNT8.INTFLAG.reg &
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module->register_callback_mask &
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module->enable_callback_mask;
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/* Check if an Overflow interrupt has occurred */
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if (interrupt_and_callback_status_mask & TC_INTFLAG_OVF) {
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/* Invoke registered and enabled callback function */
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(module->callback[TC_CALLBACK_OVERFLOW])(module);
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/* Clear interrupt flag */
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module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_OVF;
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}
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/* Check if an Error interrupt has occurred */
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if (interrupt_and_callback_status_mask & TC_INTFLAG_ERR) {
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/* Invoke registered and enabled callback function */
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(module->callback[TC_CALLBACK_ERROR])(module);
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/* Clear interrupt flag */
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module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_ERR;
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}
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/* Check if an Match/Capture Channel 0 interrupt has occurred */
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if (interrupt_and_callback_status_mask & TC_INTFLAG_MC(1)) {
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/* Invoke registered and enabled callback function */
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(module->callback[TC_CALLBACK_CC_CHANNEL0])(module);
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/* Clear interrupt flag */
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module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_MC(1);
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}
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/* Check if an Match/Capture Channel 1 interrupt has occurred */
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if (interrupt_and_callback_status_mask & TC_INTFLAG_MC(2)) {
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/* Invoke registered and enabled callback function */
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(module->callback[TC_CALLBACK_CC_CHANNEL1])(module);
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/* Clear interrupt flag */
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module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_MC(2);
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}
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}
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