atmel-samd: Add direct write access to the DAC output.

This commit is contained in:
Scott Shawcroft 2016-08-27 15:04:34 -07:00
parent 259ae8a39d
commit 16fc045509
12 changed files with 3883 additions and 1 deletions

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@ -48,6 +48,8 @@ INC += $(addprefix -Iasf/sam0/,\
drivers/port \
drivers/system \
drivers/adc/adc_sam_d_r \
drivers/dac \
drivers/dac/dac_sam_d_c \
drivers/system/clock \
drivers/system/clock/clock_samd21_r21_da \
drivers/system/interrupt \
@ -93,12 +95,13 @@ endif
SRC_ASF = $(addprefix asf/sam0/,\
drivers/adc/adc_sam_d_r/adc.c \
drivers/dac/dac_sam_d_c/dac.c \
drivers/port/port.c \
drivers/sercom/sercom.c \
drivers/sercom/sercom_interrupt.c \
drivers/sercom/usart/usart.c \
drivers/sercom/usart/usart_interrupt.c \
drivers/adc/adc_sam_d_r/adc.c \
drivers/system/clock/clock_samd21_r21_da/clock.c \
drivers/system/clock/clock_samd21_r21_da/gclk.c \
drivers/system/interrupt/system_interrupt.c \
@ -114,6 +117,7 @@ SRC_C = \
main.c \
modmachine.c \
modutime.c \
mpdac.c \
mphalport.c \
pin.c \
pin_named_pins.c \

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@ -0,0 +1,207 @@
/**
* \file
*
* \brief SAM Peripheral Digital-to-Analog Converter Driver
*
* Copyright (C) 2012-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#ifndef DAC_H_INCLUDED
#define DAC_H_INCLUDED
#ifdef __cplusplus
extern "C" {
#endif
#include <compiler.h>
#include <clock.h>
#include <gclk.h>
/**
* \addtogroup asfdoc_sam0_dac_group
*
* @{
*/
/**
* Define DAC features set according to different device families.
* @{
*/
#if (SAMD21 || SAMD10 || SAMD11 || SAMDA1)
# define FEATURE_DAC_DATABUF_WRITE_PROTECTION
#endif
/**@}*/
#ifndef DAC_TIMEOUT
# define DAC_TIMEOUT 0xFFFF
#endif
#if DAC_CALLBACK_MODE == true
# include <system_interrupt.h>
/** Forward definition of the device instance. */
struct dac_module;
#if !defined(__DOXYGEN__)
extern struct dac_module *_dac_instances[DAC_INST_NUM];
#endif
/** Type definition for a DAC module callback function. */
typedef void (*dac_callback_t)(uint8_t channel);
/** Enum for the possible callback types for the DAC module. */
enum dac_callback {
/** Callback type for when a DAC channel data empty condition occurs
* (requires event triggered mode) */
DAC_CALLBACK_DATA_EMPTY,
/** Callback type for when a DAC channel data underrun condition occurs
* (requires event triggered mode) */
DAC_CALLBACK_DATA_UNDERRUN,
/** Callback type for when a DAC channel write buffer job complete (requires
* event triggered mode) */
DAC_CALLBACK_TRANSFER_COMPLETE,
#if !defined(__DOXYGEN__)
DAC_CALLBACK_N,
#endif
};
#endif
#include <dac_feature.h>
/**
* \name Configuration and Initialization
* @{
*/
bool dac_is_syncing(
struct dac_module *const dev_inst);
void dac_get_config_defaults(
struct dac_config *const config);
enum status_code dac_init(
struct dac_module *const dev_inst,
Dac *const module,
struct dac_config *const config);
void dac_reset(
struct dac_module *const dev_inst);
void dac_enable(
struct dac_module *const dev_inst);
void dac_disable(
struct dac_module *const dev_inst);
void dac_enable_events(
struct dac_module *const module_inst,
struct dac_events *const events);
void dac_disable_events(
struct dac_module *const module_inst,
struct dac_events *const events);
/** @} */
/**
* \name Configuration and Initialization (Channel)
* @{
*/
void dac_chan_get_config_defaults(
struct dac_chan_config *const config);
void dac_chan_set_config(
struct dac_module *const dev_inst,
const enum dac_channel channel,
struct dac_chan_config *const config);
void dac_chan_enable(
struct dac_module *const dev_inst,
enum dac_channel channel);
void dac_chan_disable(
struct dac_module *const dev_inst,
enum dac_channel channel);
/** @} */
/**
* \name Channel Data Management
* @{
*/
enum status_code dac_chan_write(
struct dac_module *const dev_inst,
enum dac_channel channel,
const uint16_t data);
enum status_code dac_chan_write_buffer_wait(
struct dac_module *const module_inst,
enum dac_channel channel,
uint16_t *buffer,
uint32_t length);
/** @} */
/**
* \name Status Management
* @{
*/
uint32_t dac_get_status(
struct dac_module *const module_inst);
void dac_clear_status(
struct dac_module *const module_inst,
uint32_t status_flags);
/** @} */
#ifdef __cplusplus
}
#endif
/** @} */
#endif /* DAC_H_INCLUDED */

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@ -0,0 +1,119 @@
/**
* \file
*
* \brief SAM Digital-to-Analog Interrupt Driver
*
* Copyright (C) 2013-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#ifndef DAC_CALLBACK_H_INCLUDED
#define DAC_CALLBACK_H_INCLUDED
#include <compiler.h>
#include "dac.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* \addtogroup asfdoc_sam0_dac_group
*
* @{
*/
/** \name Callback Configuration and Initialization
* @{
*/
enum status_code dac_chan_write_buffer_job(
struct dac_module *const module_inst,
const enum dac_channel channel,
uint16_t *buffer,
uint32_t buffer_size);
enum status_code dac_chan_write_job(
struct dac_module *const module_inst,
const enum dac_channel channel,
uint16_t data);
enum status_code dac_register_callback(
struct dac_module *const module,
const enum dac_channel channel,
const dac_callback_t callback,
const enum dac_callback type);
enum status_code dac_unregister_callback(
struct dac_module *const module,
const enum dac_channel channel,
const enum dac_callback type);
/** @} */
/** \name Callback Enabling and Disabling (Channel)
* @{
*/
enum status_code dac_chan_enable_callback(
struct dac_module *const module,
const enum dac_channel channel,
const enum dac_callback type);
enum status_code dac_chan_disable_callback(
struct dac_module *const module,
const enum dac_channel channel,
const enum dac_callback type);
enum status_code dac_chan_get_job_status(
struct dac_module *module_inst,
const enum dac_channel channel);
void dac_chan_abort_job(
struct dac_module *module_inst,
const enum dac_channel channel);
/** @} */
/** @} */
#ifdef __cplusplus
}
#endif
#endif

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@ -0,0 +1,779 @@
/**
* \file
*
* \brief SAM Peripheral Digital-to-Analog Converter Driver
*
* Copyright (C) 2012-2016 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "dac.h"
#include <system.h>
#include <pinmux.h>
/**
* \internal Writes a DAC configuration to the hardware module.
*
* Writes out a given configuration to the hardware module.
*
* \param[out] module_inst Pointer to the DAC software instance struct
* \param[in] config Pointer to the configuration struct
*
*/
static void _dac_set_config(
struct dac_module *const module_inst,
struct dac_config *const config)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(config);
Assert(module_inst->hw);
Dac *const dac_module = module_inst->hw;
/* Set selected DAC output to be enabled when enabling the module */
module_inst->output = config->output;
module_inst->start_on_event = false;
uint32_t new_ctrla = 0;
uint32_t new_ctrlb = 0;
/* Enable DAC in standby sleep mode if configured */
if (config->run_in_standby) {
new_ctrla |= DAC_CTRLA_RUNSTDBY;
}
/* Set reference voltage */
new_ctrlb |= config->reference;
/* Left adjust data if configured */
if (config->left_adjust) {
new_ctrlb |= DAC_CTRLB_LEFTADJ;
}
#ifdef FEATURE_DAC_DATABUF_WRITE_PROTECTION
/* Bypass DATABUF write protection if configured */
if (config->databuf_protection_bypass) {
new_ctrlb |= DAC_CTRLB_BDWP;
}
#endif
/* Voltage pump disable if configured */
if (config->voltage_pump_disable) {
new_ctrlb |= DAC_CTRLB_VPD;
}
/* Apply the new configuration to the hardware module */
dac_module->CTRLA.reg = new_ctrla;
while (dac_is_syncing(module_inst)) {
/* Wait until the synchronization is complete */
}
dac_module->CTRLB.reg = new_ctrlb;
}
/**
* \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] dev_inst Pointer to the DAC software instance struct
*
* \return Synchronization status of the underlying hardware module(s).
*
* \retval true If the module synchronization is ongoing
* \retval false If the module has completed synchronization
*/
bool dac_is_syncing(
struct dac_module *const dev_inst)
{
/* Sanity check arguments */
Assert(dev_inst);
Dac *const dac_module = dev_inst->hw;
#if (SAMC21)
if (dac_module->SYNCBUSY.reg) {
#else
if (dac_module->STATUS.reg & DAC_STATUS_SYNCBUSY) {
#endif
return true;
}
return false;
}
/**
* \brief Initializes a DAC configuration structure to defaults.
*
* Initializes a given DAC 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 1V from internal bandgap reference
* \li Drive the DAC output to the VOUT pin
* \li Right adjust data
* \li GCLK generator 0 (GCLK main) clock source
* \li The output buffer is disabled when the chip enters STANDBY sleep
* mode
*
* \param[out] config Configuration structure to initialize to default values
*/
void dac_get_config_defaults(
struct dac_config *const config)
{
/* Sanity check arguments */
Assert(config);
/* Default configuration values */
config->reference = DAC_REFERENCE_INT1V;
config->output = DAC_OUTPUT_EXTERNAL;
config->left_adjust = false;
#ifdef FEATURE_DAC_DATABUF_WRITE_PROTECTION
config->databuf_protection_bypass = false;
#endif
config->voltage_pump_disable = false;
config->clock_source = GCLK_GENERATOR_0;
config->run_in_standby = false;
#if (SAMC21)
config->dither_mode = false;
#endif
}
/**
* \brief Initialize the DAC device struct.
*
* Use this function to initialize the Digital to Analog Converter. Resets the
* underlying hardware module and configures it.
*
* \note The DAC channel must be configured separately.
*
* \param[out] module_inst Pointer to the DAC software instance struct
* \param[in] module Pointer to the DAC module instance
* \param[in] config Pointer to the config struct, created by the user
* application
*
* \return Status of initialization.
* \retval STATUS_OK Module initiated correctly
* \retval STATUS_ERR_DENIED If module is enabled
* \retval STATUS_BUSY If module is busy resetting
*/
enum status_code dac_init(
struct dac_module *const module_inst,
Dac *const module,
struct dac_config *const config)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module);
Assert(config);
/* Initialize device instance */
module_inst->hw = module;
/* Turn on the digital interface clock */
#if (SAMC21)
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, MCLK_APBCMASK_DAC);
#else
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, PM_APBCMASK_DAC);
#endif
/* Check if module is enabled. */
if (module->CTRLA.reg & DAC_CTRLA_ENABLE) {
return STATUS_ERR_DENIED;
}
/* Check if reset is in progress. */
if (module->CTRLA.reg & DAC_CTRLA_SWRST) {
return STATUS_BUSY;
}
/* Configure GCLK channel and enable clock */
struct system_gclk_chan_config gclk_chan_conf;
system_gclk_chan_get_config_defaults(&gclk_chan_conf);
gclk_chan_conf.source_generator = config->clock_source;
system_gclk_chan_set_config(DAC_GCLK_ID, &gclk_chan_conf);
system_gclk_chan_enable(DAC_GCLK_ID);
/* MUX the DAC VOUT pin */
struct system_pinmux_config pin_conf;
system_pinmux_get_config_defaults(&pin_conf);
/* Set up the DAC VOUT pin */
pin_conf.mux_position = MUX_PA02B_DAC_VOUT;
pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT;
pin_conf.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE;
system_pinmux_pin_set_config(PIN_PA02B_DAC_VOUT, &pin_conf);
/* Write configuration to module */
_dac_set_config(module_inst, config);
/* Store reference selection for later use */
module_inst->reference = config->reference;
#if DAC_CALLBACK_MODE == true
for (uint8_t i = 0; i < DAC_CALLBACK_N; i++) {
module_inst->callback[i] = NULL;
};
_dac_instances[0] = module_inst;
#endif
return STATUS_OK;
}
/**
* \brief Resets the DAC module.
*
* This function will reset the DAC module to its power on default values and
* disable it.
*
* \param[in] module_inst Pointer to the DAC software instance struct
*/
void dac_reset(
struct dac_module *const module_inst)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Dac *const dac_module = module_inst->hw;
while (dac_is_syncing(module_inst)) {
/* Wait until the synchronization is complete */
}
/* Software reset the module */
dac_module->CTRLA.reg |= DAC_CTRLA_SWRST;
}
/**
* \brief Enable the DAC module.
*
* Enables the DAC interface and the selected output. If any internal reference
* is selected it will be enabled.
*
* \param[in] module_inst Pointer to the DAC software instance struct
*
*/
void dac_enable(
struct dac_module *const module_inst)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Dac *const dac_module = module_inst->hw;
/* Enable selected output */
dac_module->CTRLB.reg |= module_inst->output;
while (dac_is_syncing(module_inst)) {
/* Wait until the synchronization is complete */
}
/* Enable the module */
dac_module->CTRLA.reg |= DAC_CTRLA_ENABLE;
/* Enable internal bandgap reference if selected in the configuration */
if (module_inst->reference == DAC_REFERENCE_INT1V) {
#if (SAMC21)
system_voltage_reference_enable(SYSTEM_VOLTAGE_REFERENCE_OUTPUT);
}
if(dac_module->CTRLA.reg & DAC_CTRLA_ENABLE) {
while(! (dac_module->STATUS.reg & DAC_STATUS_READY)) {
};
}
#else
system_voltage_reference_enable(SYSTEM_VOLTAGE_REFERENCE_BANDGAP);
}
#endif
}
/**
* \brief Disable the DAC module.
*
* Disables the DAC interface and the output buffer.
*
* \param[in] module_inst Pointer to the DAC software instance struct
*
*/
void dac_disable(
struct dac_module *const module_inst)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Dac *const dac_module = module_inst->hw;
/* Wait until the synchronization is complete */
while (dac_is_syncing(module_inst)) {
};
/* Disbale interrupt */
dac_module->INTENCLR.reg = DAC_INTENCLR_MASK;
/* Clear interrupt flag */
dac_module->INTFLAG.reg = DAC_INTFLAG_MASK;
/* Disable DAC */
dac_module->CTRLA.reg &= ~DAC_CTRLA_ENABLE;
}
/**
* \brief Enables a DAC event input or output.
*
* Enables one or more input or output events to or from the DAC module. See
* \ref dac_events "dac_events" for a list of events this module supports.
*
* \note Events cannot be altered while the module is enabled.
*
* \param[in] module_inst Software instance for the DAC peripheral
* \param[in] events Struct containing flags of events to enable
*/
void dac_enable_events(
struct dac_module *const module_inst,
struct dac_events *const events)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Assert(events);
Dac *const dac_module = module_inst->hw;
uint32_t event_mask = 0;
#if(SAMC21)
/* Configure Enable Inversion of input event */
if (events->generate_event_on_chan_falling_edge) {
event_mask |= DAC_EVCTRL_INVEI;
}
#endif
/* Configure Buffer Empty event */
if (events->generate_event_on_buffer_empty) {
event_mask |= DAC_EVCTRL_EMPTYEO;
}
/* Configure Conversion Start event */
if (events->on_event_start_conversion) {
event_mask |= DAC_EVCTRL_STARTEI;
module_inst->start_on_event = true;
}
dac_module->EVCTRL.reg |= event_mask;
}
/**
* \brief Disables a DAC event input or output.
*
* Disables one or more input or output events to or from the DAC module. See
* \ref dac_events "dac_events" for a list of events this module supports.
*
* \note Events cannot be altered while the module is enabled.
*
* \param[in] module_inst Software instance for the DAC peripheral
* \param[in] events Struct containing flags of events to disable
*/
void dac_disable_events(
struct dac_module *const module_inst,
struct dac_events *const events)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Assert(events);
Dac *const dac_module = module_inst->hw;
uint32_t event_mask = 0;
/* Configure Buffer Empty event */
if (events->generate_event_on_buffer_empty) {
event_mask |= DAC_EVCTRL_EMPTYEO;
}
/* Configure Conversion Start event */
if (events->on_event_start_conversion) {
event_mask |= DAC_EVCTRL_STARTEI;
module_inst->start_on_event = false;
}
dac_module->EVCTRL.reg &= ~event_mask;
}
/**
* \brief Initializes a DAC channel configuration structure to defaults.
*
* Initializes a given DAC channel 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 Start Conversion Event Input enabled
* \li Start Data Buffer Empty Event Output disabled
*
* \param[out] config Configuration structure to initialize to default values
*/
void dac_chan_get_config_defaults(
struct dac_chan_config *const config)
{
/* Sanity check arguments */
Assert(config);
}
/**
* \brief Writes a DAC channel configuration to the hardware module.
*
* Writes a given channel configuration to the hardware module.
*
* \note The DAC device instance structure must be initialized before calling
* this function.
*
* \param[in] module_inst Pointer to the DAC software instance struct
* \param[in] channel Channel to configure
* \param[in] config Pointer to the configuration struct
*
*/
void dac_chan_set_config(
struct dac_module *const module_inst,
const enum dac_channel channel,
struct dac_chan_config *const config)
{
/* No channel support yet */
UNUSED(channel);
}
/**
* \brief Enable a DAC channel.
*
* Enables the selected DAC channel.
*
* \param[in] module_inst Pointer to the DAC software instance struct
* \param[in] channel Channel to enable
*
*/
void dac_chan_enable(
struct dac_module *const module_inst,
enum dac_channel channel)
{
/* No channel support yet */
UNUSED(channel);
}
/**
* \brief Disable a DAC channel.
*
* Disables the selected DAC channel.
*
* \param[in] module_inst Pointer to the DAC software instance struct
* \param[in] channel Channel to disable
*
*/
void dac_chan_disable(
struct dac_module *const module_inst,
enum dac_channel channel)
{
/* No channel support yet */
UNUSED(channel);
}
/**
* \brief Enable the output buffer.
*
* Enables the output buffer and drives the DAC output to the VOUT pin.
*
* \param[in] module_inst Pointer to the DAC software instance struct
* \param[in] channel DAC channel to alter
*/
void dac_chan_enable_output_buffer(
struct dac_module *const module_inst,
enum dac_channel channel)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
/* No channel support yet */
UNUSED(channel);
Dac *const dac_module = module_inst->hw;
/* Enable output buffer */
dac_module->CTRLB.reg |= DAC_OUTPUT_EXTERNAL;
}
/**
* \brief Disable the output buffer.
*
* Disables the output buffer.
*
* \note The output buffer(s) should be disabled when a channel's output is not
* currently needed, as it will draw current even if the system is in
* sleep mode.
*
* \param[in] module_inst Pointer to the DAC software instance struct
* \param[in] channel DAC channel to alter
*/
void dac_chan_disable_output_buffer(
struct dac_module *const module_inst,
enum dac_channel channel)
{
/* Sanity check arguments*/
Assert(module_inst);
Assert(module_inst->hw);
/* No channel support yet */
UNUSED(channel);
Dac *const dac_module = module_inst->hw;
/* Disable output buffer */
dac_module->CTRLB.reg &= ~DAC_OUTPUT_EXTERNAL;
}
/**
* \brief Write to the DAC.
*
* This function writes to the DATA or DATABUF register.
* If the conversion is not event-triggered, the data will be written to
* the DATA register and the conversion will start.
* If the conversion is event-triggered, the data will be written to DATABUF
* and transferred to the DATA register and converted when a Start Conversion
* Event is issued.
* Conversion data must be right or left adjusted according to configuration
* settings.
* \note To be event triggered, the enable_start_on_event must be
* enabled in the configuration.
*
* \param[in] module_inst Pointer to the DAC software device struct
* \param[in] channel DAC channel to write to
* \param[in] data Conversion data
*
* \return Status of the operation.
* \retval STATUS_OK If the data was written
*/
enum status_code dac_chan_write(
struct dac_module *const module_inst,
enum dac_channel channel,
const uint16_t data)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
/* No channel support yet */
UNUSED(channel);
Dac *const dac_module = module_inst->hw;
/* Wait until the synchronization is complete */
while (dac_is_syncing(module_inst)) {
};
if (module_inst->start_on_event) {
/* Write the new value to the buffered DAC data register */
dac_module->DATABUF.reg = data;
} else {
/* Write the new value to the DAC data register */
dac_module->DATA.reg = data;
}
return STATUS_OK;
}
/**
* \brief Write to the DAC.
*
* This function converts a specific number of digital data.
* The conversion should be event-triggered, the data will be written to DATABUF
* and transferred to the DATA register and converted when a Start Conversion
* Event is issued.
* Conversion data must be right or left adjusted according to configuration
* settings.
* \note To be event triggered, the enable_start_on_event must be
* enabled in the configuration.
*
* \param[in] module_inst Pointer to the DAC software device struct
* \param[in] channel DAC channel to write to
* \param[in] buffer Pointer to the digital data write buffer to be converted
* \param[in] length Length of the write buffer
*
* \return Status of the operation.
* \retval STATUS_OK If the data was written or no data conversion required
* \retval STATUS_ERR_UNSUPPORTED_DEV The DAC is not configured as using event trigger
* \retval STATUS_BUSY The DAC is busy to convert
*/
enum status_code dac_chan_write_buffer_wait(
struct dac_module *const module_inst,
enum dac_channel channel,
uint16_t *buffer,
uint32_t length)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
/* No channel support yet */
UNUSED(channel);
Dac *const dac_module = module_inst->hw;
/* Wait until the synchronization is complete */
while (dac_is_syncing(module_inst)) {
};
/* Zero length request */
if (length == 0) {
/* No data to be converted */
return STATUS_OK;
}
#if DAC_CALLBACK_MODE == true
/* Check if busy */
if (module_inst->job_status == STATUS_BUSY) {
return STATUS_BUSY;
}
#endif
/* Only support event triggered conversion */
if (module_inst->start_on_event == false) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
/* Blocks while buffer is being transferred */
while (length--) {
/* Convert one data */
dac_chan_write(module_inst, channel, buffer[length]);
/* Wait until Transmit is complete or timeout */
for (uint32_t i = 0; i <= DAC_TIMEOUT; i++) {
if (dac_module->INTFLAG.reg & DAC_INTFLAG_EMPTY) {
break;
} else if (i == DAC_TIMEOUT) {
return STATUS_ERR_TIMEOUT;
}
}
}
return STATUS_OK;
}
/**
* \brief Retrieves the current module status
*
* Checks the status of the module and returns it as a bitmask of status
* flags.
*
* \param[in] module_inst Pointer to the DAC software device struct
*
* \return Bitmask of status flags.
*
* \retval DAC_STATUS_CHANNEL_0_EMPTY Data has been transferred from DATABUF
* to DATA by a start conversion event
* and DATABUF is ready for new data
* \retval DAC_STATUS_CHANNEL_0_UNDERRUN A start conversion event has occurred
* when DATABUF is empty
*
*/
uint32_t dac_get_status(
struct dac_module *const module_inst)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Dac *const dac_module = module_inst->hw;
uint8_t intflags = dac_module->INTFLAG.reg;
uint32_t status_flags = 0;
if (intflags & DAC_INTFLAG_EMPTY) {
status_flags |= DAC_STATUS_CHANNEL_0_EMPTY;
}
if (intflags & DAC_INTFLAG_UNDERRUN) {
status_flags |= DAC_STATUS_CHANNEL_0_UNDERRUN;
}
return status_flags;
}
/**
* \brief Clears a module status flag
*
* Clears the given status flag of the module.
*
* \param[in] module_inst Pointer to the DAC software device struct
* \param[in] status_flags Bit mask of status flags to clear
*
*/
void dac_clear_status(
struct dac_module *const module_inst,
uint32_t status_flags)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Dac *const dac_module = module_inst->hw;
uint32_t intflags = 0;
if (status_flags & DAC_STATUS_CHANNEL_0_EMPTY) {
intflags |= DAC_INTFLAG_EMPTY;
}
if (status_flags & DAC_STATUS_CHANNEL_0_UNDERRUN) {
intflags |= DAC_INTFLAG_UNDERRUN;
}
dac_module->INTFLAG.reg = intflags;
}

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/**
* \file
*
* \brief SAM Digital-to-Analog Interrupt Driver
*
* Copyright (C) 2013-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "dac.h"
#include "dac_callback.h"
struct dac_module *_dac_instances[DAC_INST_NUM];
/**
* \brief Convert a specific number digital data to analog through DAC.
*
* This function will perform a conversion of specific number of digital data.
* The conversion should be event-triggered, the data will be written to DATABUF
* and transferred to the DATA register and converted when a Start Conversion
* Event is issued.
* Conversion data must be right or left adjusted according to configuration
* settings.
* \note To be event triggered, the enable_start_on_event must be
* enabled in the configuration.
*
* \param[in] module_inst Pointer to the DAC software device struct
* \param[in] channel DAC channel to write to
* \param[in] buffer Pointer to the digital data write buffer to be converted
* \param[in] length Size of the write buffer
*
* \return Status of the operation.
* \retval STATUS_OK If the data was written
* \retval STATUS_ERR_UNSUPPORTED_DEV If a callback that requires event driven
* mode was specified with a DAC instance
* configured in non-event mode
* \retval STATUS_BUSY The DAC is busy to accept new job
*/
enum status_code dac_chan_write_buffer_job(
struct dac_module *const module_inst,
const enum dac_channel channel,
uint16_t *buffer,
uint32_t length)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
Assert(buffer);
UNUSED(channel);
Dac *const dac_module = module_inst->hw;
/* DAC interrupts require it to be driven by events to work, fail if in
* unbuffered (polled) mode */
if (module_inst->start_on_event == false) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
if(module_inst->remaining_conversions != 0 ||
module_inst->job_status == STATUS_BUSY){
return STATUS_BUSY;
}
/* Wait until the synchronization is complete */
while (dac_is_syncing(module_inst)) {
};
module_inst->job_status = STATUS_BUSY;
module_inst->remaining_conversions = length;
module_inst->job_buffer = buffer;
module_inst->transferred_conversions = 0;
/* Enable interrupt */
system_interrupt_enable(SYSTEM_INTERRUPT_MODULE_DAC);
dac_module->INTFLAG.reg = DAC_INTFLAG_UNDERRUN | DAC_INTFLAG_EMPTY;
dac_module->INTENSET.reg = DAC_INTENSET_UNDERRUN | DAC_INTENSET_EMPTY;
return STATUS_OK;
}
/**
* \brief Convert one digital data job.
*
* This function will perform a conversion of specfic number of digital data.
* The conversion is event-triggered, the data will be written to DATABUF
* and transferred to the DATA register and converted when a Start Conversion
* Event is issued.
* Conversion data must be right or left adjusted according to configuration
* settings.
* \note To be event triggered, the enable_start_on_event must be
* enabled in the configuration.
*
* \param[in] module_inst Pointer to the DAC software device struct
* \param[in] channel DAC channel to write to
* \param[in] data Digital data to be converted
*
* \return Status of the operation.
* \retval STATUS_OK If the data was written
* \retval STATUS_ERR_UNSUPPORTED_DEV If a callback that requires event driven
* mode was specified with a DAC instance
* configured in non-event mode
* \retval STATUS_BUSY The DAC is busy to accept new job
*/
enum status_code dac_chan_write_job(
struct dac_module *const module_inst,
const enum dac_channel channel,
uint16_t data)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(module_inst->hw);
UNUSED(channel);
/* DAC interrupts require it to be driven by events to work, fail if in
* unbuffered (polled) mode */
if (module_inst->start_on_event == false) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
if(module_inst->remaining_conversions != 0 ||
module_inst->job_status == STATUS_BUSY){
return STATUS_BUSY;
}
dac_chan_write_buffer_job(module_inst, channel, &data, 1);
return STATUS_OK;
}
/**
* \brief Registers an asynchronous callback function with the driver.
*
* Registers an asynchronous callback with the DAC driver, fired when a callback
* condition occurs.
*
* \param[in,out] module_inst Pointer to the DAC software instance struct
* \param[in] callback Pointer to the callback function to register
* \param[in] channel Logical channel to register callback function
* \param[in] type Type of callback function to register
*
* \return Status of the registration operation.
* \retval STATUS_OK The callback was registered successfully
* \retval STATUS_ERR_INVALID_ARG If an invalid callback type was supplied
* \retval STATUS_ERR_UNSUPPORTED_DEV If a callback that requires event driven
* mode was specified with a DAC instance
* configured in non-event mode
*/
enum status_code dac_register_callback(
struct dac_module *const module_inst,
const enum dac_channel channel,
const dac_callback_t callback,
const enum dac_callback type)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(callback);
UNUSED(channel);
/* DAC interrupts require it to be driven by events to work, fail if in
* unbuffered (polled) mode */
if (module_inst->start_on_event == false) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
if ((uint8_t)type < DAC_CALLBACK_N) {
module_inst->callback[(uint8_t)type] = callback;
return STATUS_OK;
}
return STATUS_ERR_INVALID_ARG;
}
/**
* \brief Unregisters an asynchronous callback function with the driver.
*
* Unregisters an asynchronous callback with the DAC driver, removing it
* from the internal callback registration table.
*
* \param[in,out] module_inst Pointer to the DAC software instance struct
* \param[in] channel Logical channel to unregister callback function
* \param[in] type Type of callback function to unregister
*
* \return Status of the de-registration operation.
* \retval STATUS_OK The callback was unregistered successfully
* \retval STATUS_ERR_INVALID_ARG If an invalid callback type was supplied
* \retval STATUS_ERR_UNSUPPORTED_DEV If a callback that requires event driven
* mode was specified with a DAC instance
* configured in non-event mode
*/
enum status_code dac_unregister_callback(
struct dac_module *const module_inst,
const enum dac_channel channel,
const enum dac_callback type)
{
/* Sanity check arguments */
Assert(module_inst);
UNUSED(channel);
/* DAC interrupts require it to be driven by events to work, fail if in
* unbuffered (polled) mode */
if (module_inst->start_on_event == false) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
if ((uint8_t)type < DAC_CALLBACK_N) {
module_inst->callback[(uint8_t)type] = NULL;
return STATUS_OK;
}
return STATUS_ERR_INVALID_ARG;
}
/**
* \brief Enables asynchronous callback generation for a given channel and type.
*
* Enables asynchronous callbacks for a given logical DAC channel and type. This
* must be called before a DAC channel will generate callback events.
*
* \param[in,out] dac_module Pointer to the DAC software instance struct
* \param[in] channel Logical channel to enable callback function
* \param[in] type Type of callback function callbacks to enable
*
* \return Status of the callback enable operation.
* \retval STATUS_OK The callback was enabled successfully
* \retval STATUS_ERR_UNSUPPORTED_DEV If a callback that requires event driven
* mode was specified with a DAC instance
* configured in non-event mode
*/
enum status_code dac_chan_enable_callback(
struct dac_module *const module_inst,
const enum dac_channel channel,
const enum dac_callback type)
{
/* Sanity check arguments */
Assert(module_inst);
UNUSED(channel);
/* DAC interrupts require it to be driven by events to work, fail if in
* unbuffered (polled) mode */
if (module_inst->start_on_event == false) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
module_inst->callback_enable[type] = true;
return STATUS_OK;
}
/**
* \brief Disables asynchronous callback generation for a given channel and type.
*
* Disables asynchronous callbacks for a given logical DAC channel and type.
*
* \param[in,out] dac_module Pointer to the DAC software instance struct
* \param[in] channel Logical channel to disable callback function
* \param[in] type Type of callback function callbacks to disable
*
* \return Status of the callback disable operation.
* \retval STATUS_OK The callback was disabled successfully
* \retval STATUS_ERR_UNSUPPORTED_DEV If a callback that requires event driven
* mode was specified with a DAC instance
* configured in non-event mode
*/
enum status_code dac_chan_disable_callback(
struct dac_module *const module_inst,
const enum dac_channel channel,
const enum dac_callback type)
{
/* Sanity check arguments */
Assert(module_inst);
UNUSED(channel);
/* DAC interrupts require it to be driven by events to work, fail if in
* unbuffered (polled) mode */
if (module_inst->start_on_event == false) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
module_inst->callback_enable[type] = false;
return STATUS_OK;
}
/** \internal
* Internal handler for DAC module interrupts.
*
* \param[in] instance DAC instance number
*/
static void _dac_interrupt_handler(const uint8_t instance)
{
struct dac_module *module = _dac_instances[instance];
Dac *const dac_hw = module->hw;
if (dac_hw->INTFLAG.reg & DAC_INTFLAG_UNDERRUN) {
dac_hw->INTFLAG.reg = DAC_INTFLAG_UNDERRUN;
if ((module->callback) &&
(module->callback_enable[DAC_CALLBACK_DATA_UNDERRUN])){
module->callback[DAC_CALLBACK_DATA_UNDERRUN](0);
}
}
if (dac_hw->INTFLAG.reg & DAC_INTFLAG_EMPTY) {
dac_hw->INTFLAG.reg = DAC_INTFLAG_EMPTY;
/* If in a write buffer job */
if (module->remaining_conversions) {
/* Fill the data buffer with next data in write buffer */
dac_hw->DATABUF.reg =
module->job_buffer[module->transferred_conversions++];
/* Write buffer size decrement */
module->remaining_conversions --;
/* If in a write buffer job and all the data are converted */
if (module->remaining_conversions == 0) {
module->job_status = STATUS_OK;
/* Disable interrupt */
dac_hw->INTENCLR.reg = DAC_INTENCLR_EMPTY;
dac_hw->INTFLAG.reg = DAC_INTFLAG_EMPTY;
system_interrupt_disable(SYSTEM_INTERRUPT_MODULE_DAC);
if ((module->callback) &&
(module->callback_enable[DAC_CALLBACK_TRANSFER_COMPLETE])) {
module->callback[DAC_CALLBACK_TRANSFER_COMPLETE](0);
}
}
}
if ((module->callback) &&
(module->callback_enable[DAC_CALLBACK_DATA_EMPTY])) {
module->callback[DAC_CALLBACK_DATA_EMPTY](0);
}
}
}
/** Handler for the DAC hardware module interrupt. */
void DAC_Handler(void)
{
_dac_interrupt_handler(0);
}
/**
* \brief Gets the status of a job
*
* Gets the status of an ongoing or the last job.
*
* \param[in] module_inst Pointer to the DAC software instance struct
* \param[in] channel Logical channel to enable callback function
*
* \return Status of the job.
*/
enum status_code dac_chan_get_job_status(
struct dac_module *module_inst,
const enum dac_channel channel)
{
/* Sanity check arguments */
Assert(module_inst);
UNUSED(channel);
return module_inst->job_status;
}
/**
* \brief Aborts an ongoing job
*
* Aborts an ongoing job.
*
* \param[in] module_inst Pointer to the DAC software instance struct
* \param[in] channel Logical channel to enable callback function
*/
void dac_chan_abort_job(
struct dac_module *module_inst,
const enum dac_channel channel)
{
/* Sanity check arguments */
Assert(module_inst);
UNUSED(channel);
/* Disable interrupt */
module_inst->hw->INTFLAG.reg = DAC_INTFLAG_UNDERRUN | DAC_INTFLAG_EMPTY;
module_inst->hw->INTENCLR.reg = DAC_INTENCLR_UNDERRUN | DAC_INTENCLR_EMPTY;
/* Mark job as aborted */
module_inst->job_status = STATUS_ABORTED;
module_inst->remaining_conversions = 0;
}

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/**
* \file
*
* \brief SAM Peripheral Digital-to-Analog Converter Driver
*
* Copyright (C) 2012-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#ifndef DAC_FEATURE_H_INCLUDED
#define DAC_FEATURE_H_INCLUDED
/**
* \defgroup asfdoc_sam0_dac_group SAM Digital-to-Analog (DAC) Driver
*
* This driver for Atmel&reg; | SMART ARM&reg;-based microcontrollers provides an interface for the conversion of
* digital values to analog voltage. The following driver API modes are covered
* by this manual:
*
* - Polled APIs
* \if DAC_CALLBACK_MODE
* - Callback APIs
* \endif
*
* The following peripheral is used by this module:
* - DAC (Digital-to-Analog Converter)
*
* The following devices can use this module:
* - Atmel | SMART SAM D20/D21
* - Atmel | SMART SAM D10/D11
* - Atmel | SMART SAM DA1
* - Atmel | SMART SAM C21
*
* The outline of this documentation is as follows:
* - \ref asfdoc_sam0_dac_prerequisites
* - \ref asfdoc_sam0_dac_module_overview
* - \ref asfdoc_sam0_dac_special_considerations
* - \ref asfdoc_sam0_dac_extra_info
* - \ref asfdoc_sam0_dac_examples
* - \ref asfdoc_sam0_dac_api_overview
*
*
* \section asfdoc_sam0_dac_prerequisites Prerequisites
*
* There are no prerequisites for this module.
*
*
* \section asfdoc_sam0_dac_module_overview Module Overview
*
* The Digital-to-Analog converter converts a digital value to analog voltage.
* The SAM DAC module has one channel with 10-bit resolution,
* and is capable of converting up to 350k samples per second (ksps).
*
* A common use of DAC is to generate audio signals by connecting the DAC
* output to a speaker, or to generate a reference voltage; either for an
* external circuit or an internal peripheral such as the Analog Comparator.
*
* After being set up, the DAC will convert new digital values written to the
* conversion data register (DATA) to an analog value either on the VOUT pin of
* the device, or internally for use as an input to the AC, ADC, and other analog
* modules.
*
* Writing the DATA register will start a new conversion. It is also possible
* to trigger the conversion from the event system.
*
* A simplified block diagram of the DAC can be seen in
* \ref asfdoc_sam0_dac_module_block_diagram "the figure below".
*
* \anchor asfdoc_sam0_dac_module_block_diagram
* \image html dac_block_diagram.svg "DAC Block Diagram"
*
* \subsection asfdoc_sam0_dac_conversion_range Conversion Range
* The conversion range is between GND and the selected voltage reference.
* Available voltage references are:
* \li AVCC voltage reference
* \li Internal 1V reference (INT1V)
* \li External voltage reference (AREF)
*
* \note Internal references will be enabled by the driver, but not disabled.
* Any reference not used by the application should be disabled by the application.
*
* The output voltage from a DAC channel is given as:
* \f[
* V_{OUT} = \frac{DATA}{0x3FF} \times VREF
* \f]
*
* \subsection asfdoc_sam0_dac_conversion Conversion
* The digital value written to the conversion data register (DATA) will be
* converted to an analog value.
* Writing the DATA register will start a new conversion.
* It is also possible to write the conversion data to the DATABUF register,
* the writing of the DATA register can then be triggered from the event
* system, which will load the value from DATABUF to DATA.
*
* \subsection asfdoc_sam0_dac_analog_output Analog Output
* The analog output value can be output to either the VOUT pin or internally,
* but not both at the same time.
*
* \subsubsection asfdoc_sam0_dac_analog_output_external External Output
* The output buffer must be enabled in order to drive the DAC output to the
* VOUT pin. Due to the output buffer, the DAC has high drive strength, and is
* capable of driving both resistive and capacitive loads, as well as loads
* which combine both.
*
* \subsubsection asfdoc_sam0_dac_analog_output_internal Internal Output
* The analog value can be internally available for use as input to the
* AC or ADC modules.
*
* \subsection asfdoc_sam0_dac_events Events
* Events generation and event actions are configurable in the DAC.
* The DAC has one event line input and one event output: <i>Start Conversion</i>
* and <i>Data Buffer Empty</i>.
*
* If the Start Conversion input event is enabled in the module configuration,
* an incoming event will load data from the data buffer to the data register
* and start a new conversion. This method synchronizes conversions with
* external events (such as those from a timer module) and ensures regular and
* fixed conversion intervals.
*
* If the Data Buffer Empty output event is enabled in the module configuration,
* events will be generated when the DAC data buffer register becomes empty and
* new data can be loaded to the buffer.
*
* \note The connection of events between modules requires the use of the event
* driver to route output event of one module to the input event of another.
* For more information on event routing, refer to the documentation
* \ref asfdoc_sam0_events_group "SAM Event System (EVENTS) Driver".
*
* \subsection asfdoc_sam0_dac_data_adjust Left and Right Adjusted Values
* The 10-bit input value to the DAC is contained in a 16-bit register. This
* can be configured to be either left or right adjusted. In
* \ref asfdoc_sam0_dac_module_adj_modes "the figure below" both options are
* shown, and the position of the most (MSB) and the least (LSB) significant bits
* are indicated. The unused bits should always be written to zero.
*
* \anchor asfdoc_sam0_dac_module_adj_modes
* \dot
* digraph {
* subgraph cluster_right {
* msbl [label="MSB", shape=none, group="msbl"];
* lsbl [label="LSB", shape=none];
* node [shape=none];
* color="white";
* reg_left [label=<
* <table cellspacing="0" cellpadding="2" width="100%">
* <tr>
* <td port="msb">15</td>
* <td>14</td>
* <td>13</td>
* <td>12</td>
* <td>11</td>
* <td>10</td>
* <td>9</td>
* <td>8</td>
* <td>7</td>
* <td port="lsb">6</td>
* <td>5</td>
* <td>4</td>
* <td>3</td>
* <td>2</td>
* <td>1</td>
* <td>0</td>
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* <td COLSPAN="10"> DATA[9:0] </td>
* <td BGCOLOR="lightgray"> </td>
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* <td BGCOLOR="lightgray"> </td>
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* <td BGCOLOR="lightgray"> </td>
* <td BGCOLOR="lightgray"> </td>
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* >];
* msbl -> reg_left:msb:n;
* lsbl -> reg_left:lsb;
* label ="Left adjusted.\n";
* }
* subgraph cluster_left {
* rankdir=TB;
* msb [label="MSB", shape=none];
* lsb [label="LSB", shape=none];
* color="white";
* node [shape=none];
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* <table cellspacing="0" cellpadding="2">
* <tr>
* <td>15</td>
* <td>14</td>
* <td>13</td>
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* <td>11</td>
* <td>10</td>
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* <td>6</td>
* <td>5</td>
* <td>4</td>
* <td>3</td>
* <td>2</td>
* <td>1</td>
* <td port="lsb">0</td>
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* <td BGCOLOR="lightgray"></td>
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* <td BGCOLOR="lightgray"></td>
* <td COLSPAN="10"> DATA[9:0] </td>
* </tr>
* </table>
* >];
* msb -> reg_right:msb;
* lsb -> reg_right:lsb:n;
* label = "Right adjusted.\n";
* graph [shape=none];
* }
* }
* \enddot
*
* \subsection asfdoc_sam0_dac_clk_sources Clock Sources
* The clock for the DAC interface (CLK_DAC) is generated by the Power Manager.
* This clock is turned on by default, and can be enabled and disabled in the
* Power Manager.
*
* Additionally, an asynchronous clock source (GCLK_DAC) is required.
* These clocks are normally disabled by default. The selected clock source
* must be enabled in the Power Manager before it can be used by the DAC.
* The DAC core operates asynchronously from the user interface and
* peripheral bus. As a consequence, the DAC needs two clock cycles of both
* CLK_DAC and GCLK_DAC to synchronize the values written to some of the
* control and data registers.
* The oscillator source for the GCLK_DAC clock is selected in the System
* Control Interface (SCIF).
*
* \section asfdoc_sam0_dac_special_considerations Special Considerations
*
* \subsection asfdoc_sam0_dac_special_considerations_output_buffer Output Driver
* The DAC can only do conversions in Active or Idle modes. However, if the
* output buffer is enabled it will draw current even if the system is in
* sleep mode. Therefore, always make sure that the output buffer is not
* enabled when it is not needed, to ensure minimum power consumption.
*
* \subsection asfdoc_sam0_dac_special_considerations_conversion_time Conversion Time
* DAC conversion time is approximately 2.85µs. The user must ensure that new
* data is not written to the DAC before the last conversion is complete.
* Conversions should be triggered by a periodic event from a Timer/Counter or
* another peripheral.
*
*
* \section asfdoc_sam0_dac_extra_info Extra Information
*
* For extra information, see \ref asfdoc_sam0_dac_extra. This includes:
* - \ref asfdoc_sam0_dac_extra_acronyms
* - \ref asfdoc_sam0_dac_extra_dependencies
* - \ref asfdoc_sam0_dac_extra_errata
* - \ref asfdoc_sam0_dac_extra_history
*
*
* \section asfdoc_sam0_dac_examples Examples
*
* For a list of examples related to this driver, see
* \ref asfdoc_sam0_dac_exqsg.
*
*
* \section asfdoc_sam0_dac_api_overview API Overview
* @{
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <compiler.h>
#include <clock.h>
#include <gclk.h>
/**
* \name DAC Status Flags
*
* DAC status flags, returned by \ref dac_get_status() and cleared by
* \ref dac_clear_status().
* @{
*/
/** Data Buffer Empty Channel 0 - Set when data is transferred from DATABUF
* to DATA by a start conversion event and DATABUF is ready for new data.
*/
#define DAC_STATUS_CHANNEL_0_EMPTY (1UL << 0)
/** Under-run Channel 0 - Set when a start conversion event occurs when
* DATABUF is empty.
*/
#define DAC_STATUS_CHANNEL_0_UNDERRUN (1UL << 1)
/** @} */
/**
* \brief DAC reference voltage enum.
*
* Enum for the possible reference voltages for the DAC.
*/
enum dac_reference {
/** 1V from the internal band-gap reference*/
DAC_REFERENCE_INT1V = DAC_CTRLB_REFSEL(0),
/** Analog V<SUB>CC</SUB> as reference */
DAC_REFERENCE_AVCC = DAC_CTRLB_REFSEL(1),
/** External reference on AREF */
DAC_REFERENCE_AREF = DAC_CTRLB_REFSEL(2),
};
/**
* \brief DAC output selection enum.
*
* Enum for the DAC output selection.
*/
enum dac_output {
/** DAC output to VOUT pin */
DAC_OUTPUT_EXTERNAL = DAC_CTRLB_EOEN,
/** DAC output as internal reference */
DAC_OUTPUT_INTERNAL = DAC_CTRLB_IOEN,
/** No output */
DAC_OUTPUT_NONE = 0,
};
/**
* \brief DAC channel selection enum.
*
* Enum for the DAC channel selection.
*/
enum dac_channel {
/** DAC output channel 0 */
DAC_CHANNEL_0,
};
/**
* \brief DAC software device instance structure.
*
* DAC 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 dac_module {
#if !defined(__DOXYGEN__)
/** DAC hardware module */
Dac *hw;
/** DAC output selection */
enum dac_output output;
/** Reference selection */
enum dac_reference reference;
/** DAC event selection */
bool start_on_event;
# if DAC_CALLBACK_MODE == true
/** Pointer to buffer used for ADC results */
volatile uint16_t *job_buffer;
/** Remaining number of conversions in current job */
volatile uint16_t remaining_conversions;
/** Transferred number of conversions in current job */
volatile uint16_t transferred_conversions;
/** DAC callback enable */
bool callback_enable[DAC_CALLBACK_N];
/** DAC registered callback functions */
dac_callback_t callback[DAC_CALLBACK_N];
/** Holds the status of the ongoing or last conversion job */
volatile enum status_code job_status;
# endif
#endif
};
/**
* \brief DAC configuration structure.
*
* Configuration structure for a DAC instance. This structure should be
* initialized by the \ref dac_get_config_defaults()
* function before being modified by the user application.
*/
struct dac_config {
/** Reference voltage */
enum dac_reference reference;
/** Select DAC output */
enum dac_output output;
/** Left adjusted data */
bool left_adjust;
/** GCLK generator used to clock the peripheral */
enum gclk_generator clock_source;
#ifdef FEATURE_DAC_DATABUF_WRITE_PROTECTION
/** Bypass DATABUF write protection */
bool databuf_protection_bypass;
#endif
/** Voltage pump disable */
bool voltage_pump_disable;
/**
* The DAC behaves as in normal mode when the chip enters STANDBY sleep
* mode
*/
bool run_in_standby;
#if (SAMC21)
/** Dither mode enable data */
bool dither_mode;
#endif
};
/**
* \brief DAC event enable/disable structure.
*
* Event flags for the DAC module. This is used to enable and
* disable events via \ref dac_enable_events() and \ref dac_disable_events().
*/
struct dac_events {
/** Start a new DAC conversion */
bool on_event_start_conversion;
/** Enable event generation on data buffer empty */
bool generate_event_on_buffer_empty;
#if (SAMC21)
/** Enable the falling edge of the input event for DAC1 */
bool generate_event_on_chan_falling_edge;
#endif
};
/**
* \brief DAC channel configuration structure
*
* Configuration for a DAC channel. This structure should be initialized by the
* \ref dac_chan_get_config_defaults() function before being modified by the
* user application.
*/
struct dac_chan_config {
#if !defined(__DOXYGEN__)
/** Dummy value to ensure the struct has at least one member */
uint8_t _dummy;
#endif
};
/**
* \name Configuration and Initialization (Channel)
* @{
*/
void dac_chan_enable_output_buffer(
struct dac_module *const dev_inst,
const enum dac_channel channel);
void dac_chan_disable_output_buffer(
struct dac_module *const dev_inst,
const enum dac_channel channel);
/** @} */
/** @} */
/**
* \page asfdoc_sam0_dac_extra Extra Information for DAC Driver
*
* \section asfdoc_sam0_dac_extra_acronyms Acronyms
* The table below presents the acronyms used in this module:
*
* <table>
* <tr>
* <th>Acronym</th>
* <th>Description</th>
* </tr>
* <tr>
* <td>ADC</td>
* <td>Analog-to-Digital Converter</td>
* </tr>
* <tr>
* <td>AC</td>
* <td>Analog Comparator</td>
* </tr>
* <tr>
* <td>DAC</td>
* <td>Digital-to-Analog Converter</td>
* </tr>
* <tr>
* <td>LSB</td>
* <td>Least Significant Bit</td>
* </tr>
* <tr>
* <td>MSB</td>
* <td>Most Significant Bit</td>
* </tr>
* <tr>
* <td>DMA</td>
* <td>Direct Memory Access</td>
* </tr>
* </table>
*
*
* \section asfdoc_sam0_dac_extra_dependencies Dependencies
* This driver has the following dependencies:
*
* - \ref asfdoc_sam0_system_pinmux_group "System Pin Multiplexer Driver"
*
*
* \section asfdoc_sam0_dac_extra_errata Errata
* There are no errata related to this driver.
*
*
* \section asfdoc_sam0_dac_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>Add configuration for using 14-bit hardware dithering (SAMC21 support)</td>
* </tr>
* <tr>
* <td>Added new configuration parameters \c databuf_protection_bypass,
* \c voltage_pump_disable. Added new callback functions
* \c dac_chan_write_buffer_wait,
* \c dac_chan_write_buffer_job, \c dac_chan_write_job,
* \c dac_get_job_status, \c dac_abort_job and new callback type
* \c DAC_CALLBACK_TRANSFER_COMPLETE for DAC conversion job</td>
* </tr>
* <tr>
* <td>Initial Release</td>
* </tr>
* </table>
*/
/**
* \page asfdoc_sam0_dac_exqsg Examples for DAC Driver
*
* This is a list of the available Quick Start guides (QSGs) and example
* applications for \ref asfdoc_sam0_dac_group. QSGs are simple examples with
* step-by-step instructions to configure and use this driver in a selection of
* use cases. Note that a QSG can be compiled as a standalone application or be
* added to the user application.
*
* - \subpage asfdoc_sam0_dac_basic_use_case
* \if DAC_CALLBACK_MODE
* - \subpage asfdoc_sam0_dac_basic_use_case_callback
* \endif
* \if DAC_DMA_USE_MODE_SELECTION
* - \subpage asfdoc_sam0_adc_dma_use_case_dac_in_dma
* \endif
*
* \if DAC_DMA_USE_MODE_SELECTION
* \page asfdoc_sam0_adc_dma_use_case_dac_in_dma Quick Start Guide for Using DMA with ADC/DAC
* For this examples, see
* \ref asfdoc_sam0_adc_dma_use_case
* \endif
*
* \page asfdoc_sam0_dac_document_revision_history Document Revision History
*
* <table>
* <tr>
* <th>Doc. Rev.</td>
* <th>Date</td>
* <th>Comments</td>
* </tr>
* <tr>
* <td>42110E</td>
* <td>09/2015</td>
* <td>Add SAM C21 and SAM DA1 support</td>
* </tr>
* <tr>
* <td>42110D</td>
* <td>12/2014</td>
* <td>Add SAM D10/D11 support</td>
* </tr>
* <tr>
* <td>42110C</td>
* <td>01/2014</td>
* <td>Add SAM D21 support</td>
* </tr>
* <tr>
* <td>42110B</td>
* <td>06/2013</td>
* <td>Added additional documentation on the event system. Corrected
* documentation typos.</td>
* </tr>
* <tr>
* <td>42110A</td>
* <td>06/2013</td>
* <td>Initial document release</td>
* </tr>
* </table>
*/
#ifdef __cplusplus
}
#endif
#endif /* DAC_FEATURE_H_INCLUDED */

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@ -32,6 +32,7 @@
#include "py/runtime.h"
#include "adc.h"
#include "mpdac.h"
#include "pin.h"
#if MICROPY_PY_MACHINE
@ -39,6 +40,7 @@
STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_umachine) },
{ MP_ROM_QSTR(MP_QSTR_ADC), MP_ROM_PTR(&adc_type) },
{ MP_ROM_QSTR(MP_QSTR_DAC), MP_ROM_PTR(&dac_type) },
{ MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&pin_type) },
};

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@ -56,6 +56,8 @@
#define MICROPY_PY_MACHINE (1)
#define MICROPY_MODULE_WEAK_LINKS (1)
#define MICROPY_REPL_AUTO_INDENT (1)
#define MICROPY_HW_ENABLE_DAC (1)
#define MICROPY_ENABLE_FINALISER (1)
// type definitions for the specific machine

152
atmel-samd/mpdac.c Normal file
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@ -0,0 +1,152 @@
/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
//
// #include "py/nlr.h"
#include "py/runtime.h"
// #include "timer.h"
#include "mpdac.h"
// #include "dma.h"
// #include "pin.h"
// #include "genhdr/pins.h"
#include "asf/sam0/drivers/dac/dac.h"
/// \moduleref machine
/// \class DAC - digital to analog conversion
///
/// The DAC is used to output analog values (a specific voltage) on pin PA02
/// (Arduino Zero A0, Feather MO Bluefruit A0).
/// The voltage will be between 0 and 3.3V.
///
/// *This module will undergo changes to the API.*
///
/// Example usage:
///
/// from machine import DAC
///
/// dac = DAC() # create DAC 1 on pin PA02
/// dac.write(512) # write a value to the DAC (makes PA02 1.65V)
/// dac.write_mv(1650) # Also results in PA02 being 1.65V
/******************************************************************************/
// Micro Python bindings
typedef struct _dac_obj_t {
mp_obj_base_t base;
struct dac_module dac_instance;
} dac_obj_t;
// create the dac object
/// \classmethod \constructor()
/// Construct a new DAC object for pin PA02.
STATIC mp_obj_t dac_make_new(const mp_obj_type_t *type, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 0, MP_OBJ_FUN_ARGS_MAX, true);
dac_obj_t *dac = m_new_obj(dac_obj_t);
dac->base.type = &dac_type;
struct dac_config config_dac;
dac_get_config_defaults(&config_dac);
config_dac.reference = DAC_REFERENCE_AVCC;
enum status_code status = dac_init(&dac->dac_instance, DAC, &config_dac);
if (status != STATUS_OK) {
// Throw error.
return mp_const_none;
}
struct dac_chan_config config_dac_chan;
dac_chan_get_config_defaults(&config_dac_chan);
dac_chan_set_config(&dac->dac_instance, DAC_CHANNEL_0, &config_dac_chan);
dac_chan_enable(&dac->dac_instance, DAC_CHANNEL_0);
dac_enable(&dac->dac_instance);
// return object
return dac;
}
/// \method deinit()
/// Turn off the DAC, enable other use of pin.
STATIC mp_obj_t dac_del(mp_obj_t self_in) {
dac_obj_t *self = self_in;
dac_disable(&self->dac_instance);
dac_chan_disable(&self->dac_instance, DAC_CHANNEL_0);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dac_del_obj, dac_del);
/// \method write(value)
/// Direct access to the DAC output (10 bit).
STATIC mp_obj_t dac_write(mp_obj_t self_in, mp_obj_t val) {
dac_obj_t *self = self_in;
dac_chan_write(&self->dac_instance, DAC_CHANNEL_0, mp_obj_get_int(val));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(dac_write_obj, dac_write);
/// \method write_mv(value)
/// Direct access to the DAC output by specifying millivolts.
STATIC mp_obj_t dac_write_mv(mp_obj_t self_in, mp_obj_t val_mv) {
dac_obj_t *self = self_in;
// TODO(tannewt): Sanity check that the mv value is less than the reference
// voltage.
// Dividing by 3301 instead of 3300 ensures that val_mv of 3300 actually
// produces a value of 1023 instead of 1024 which is out of range of the
// DAC.
uint16_t val = ((uint32_t) mp_obj_get_int(val_mv)) * 1024 / 3301;
dac_chan_write(&self->dac_instance, DAC_CHANNEL_0, val);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(dac_write_mv_obj, dac_write_mv);
STATIC const mp_map_elem_t dac_locals_dict_table[] = {
// instance methods
{ MP_OBJ_NEW_QSTR(MP_QSTR___del__), (mp_obj_t)&dac_del_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&dac_write_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_write_mv), (mp_obj_t)&dac_write_mv_obj },
};
STATIC MP_DEFINE_CONST_DICT(dac_locals_dict, dac_locals_dict_table);
const mp_obj_type_t dac_type = {
{ &mp_type_type },
.name = MP_QSTR_DAC,
.make_new = dac_make_new,
.locals_dict = (mp_obj_t)&dac_locals_dict,
};

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
extern const mp_obj_type_t dac_type;