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351 lines
11 KiB
C
351 lines
11 KiB
C
4 years ago
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/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file hal_dac.c
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* @brief DAC Driver code.
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*
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* @addtogroup DAC
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* @{
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*/
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#include "hal.h"
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#if (HAL_USE_DAC == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief DAC Driver initialization.
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* @note This function is implicitly invoked by @p halInit(), there is
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* no need to explicitly initialize the driver.
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*
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* @init
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*/
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void dacInit(void) {
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dac_lld_init();
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}
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/**
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* @brief Initializes the standard part of a @p DACDriver structure.
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*
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* @param[out] dacp pointer to the @p DACDriver object
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*
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* @init
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*/
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void dacObjectInit(DACDriver *dacp) {
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dacp->state = DAC_STOP;
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dacp->config = NULL;
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#if DAC_USE_WAIT
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dacp->thread = NULL;
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#endif
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#if DAC_USE_MUTUAL_EXCLUSION
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osalMutexObjectInit(&dacp->mutex);
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#endif
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#if defined(DAC_DRIVER_EXT_INIT_HOOK)
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DAC_DRIVER_EXT_INIT_HOOK(dacp);
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#endif
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}
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/**
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* @brief Configures and activates the DAC peripheral.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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* @param[in] config pointer to the @p DACConfig object, it can be
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* @p NULL if the low level driver implementation
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* supports a default configuration
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*
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* @api
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*/
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void dacStart(DACDriver *dacp, const DACConfig *config) {
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osalDbgCheck(dacp != NULL);
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osalSysLock();
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osalDbgAssert((dacp->state == DAC_STOP) || (dacp->state == DAC_READY),
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"invalid state");
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dacp->config = config;
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dac_lld_start(dacp);
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dacp->state = DAC_READY;
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osalSysUnlock();
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}
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/**
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* @brief Deactivates the DAC peripheral.
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* @note Deactivating the peripheral also enforces a release of the slave
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* select line.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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*
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* @api
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*/
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void dacStop(DACDriver *dacp) {
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osalDbgCheck(dacp != NULL);
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osalSysLock();
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osalDbgAssert((dacp->state == DAC_STOP) || (dacp->state == DAC_READY),
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"invalid state");
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dac_lld_stop(dacp);
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dacp->config = NULL;
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dacp->state = DAC_STOP;
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osalSysUnlock();
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}
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/**
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* @brief Outputs a value directly on a DAC channel.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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* @param[in] channel DAC channel number
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* @param[in] sample value to be output
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*
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* @xclass
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*/
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void dacPutChannelX(DACDriver *dacp, dacchannel_t channel, dacsample_t sample) {
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osalDbgCheck(channel < (dacchannel_t)DAC_MAX_CHANNELS);
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osalDbgAssert(dacp->state == DAC_READY, "invalid state");
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dac_lld_put_channel(dacp, channel, sample);
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}
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/**
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* @brief Starts a DAC conversion.
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* @details Starts an asynchronous conversion operation.
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* @note The buffer is organized as a matrix of M*N elements where M is the
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* channels number configured into the conversion group and N is the
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* buffer depth. The samples are sequentially written into the buffer
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* with no gaps.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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* @param[in] grpp pointer to a @p DACConversionGroup object
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* @param[in] samples pointer to the samples buffer
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* @param[in] depth buffer depth (matrix rows number). The buffer depth
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* must be one or an even number.
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*
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* @api
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*/
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void dacStartConversion(DACDriver *dacp,
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const DACConversionGroup *grpp,
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dacsample_t *samples,
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size_t depth) {
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osalSysLock();
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dacStartConversionI(dacp, grpp, samples, depth);
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osalSysUnlock();
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}
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/**
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* @brief Starts a DAC conversion.
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* @details Starts an asynchronous conversion operation.
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* @post The callbacks associated to the conversion group will be invoked
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* on buffer fill and error events.
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* @note The buffer is organized as a matrix of M*N elements where M is the
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* channels number configured into the conversion group and N is the
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* buffer depth. The samples are sequentially written into the buffer
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* with no gaps.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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* @param[in] grpp pointer to a @p DACConversionGroup object
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* @param[in] samples pointer to the samples buffer
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* @param[in] depth buffer depth (matrix rows number). The buffer depth
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* must be one or an even number.
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*
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* @iclass
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*/
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void dacStartConversionI(DACDriver *dacp,
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const DACConversionGroup *grpp,
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dacsample_t *samples,
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size_t depth) {
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osalDbgCheckClassI();
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osalDbgCheck((dacp != NULL) && (grpp != NULL) && (samples != NULL) &&
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((depth == 1U) || ((depth & 1U) == 0U)));
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osalDbgAssert((dacp->state == DAC_READY) ||
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(dacp->state == DAC_COMPLETE) ||
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(dacp->state == DAC_ERROR),
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"not ready");
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dacp->samples = samples;
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dacp->depth = depth;
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dacp->grpp = grpp;
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dacp->state = DAC_ACTIVE;
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dac_lld_start_conversion(dacp);
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}
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/**
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* @brief Stops an ongoing conversion.
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* @details This function stops the currently ongoing conversion and returns
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* the driver in the @p DAC_READY state. If there was no conversion
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* being processed then the function does nothing.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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*
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* @api
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*/
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void dacStopConversion(DACDriver *dacp) {
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osalDbgCheck(dacp != NULL);
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osalSysLock();
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osalDbgAssert((dacp->state == DAC_READY) ||
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(dacp->state == DAC_ACTIVE),
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"invalid state");
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if (dacp->state != DAC_READY) {
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dac_lld_stop_conversion(dacp);
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dacp->grpp = NULL;
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dacp->state = DAC_READY;
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_dac_reset_s(dacp);
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}
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osalSysUnlock();
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}
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/**
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* @brief Stops an ongoing conversion.
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* @details This function stops the currently ongoing conversion and returns
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* the driver in the @p DAC_READY state. If there was no conversion
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* being processed then the function does nothing.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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*
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* @iclass
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*/
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void dacStopConversionI(DACDriver *dacp) {
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osalDbgCheckClassI();
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osalDbgCheck(dacp != NULL);
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osalDbgAssert((dacp->state == DAC_READY) ||
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(dacp->state == DAC_ACTIVE) ||
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(dacp->state == DAC_COMPLETE),
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"invalid state");
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if (dacp->state != DAC_READY) {
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dac_lld_stop_conversion(dacp);
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dacp->grpp = NULL;
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dacp->state = DAC_READY;
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_dac_reset_i(dacp);
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}
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}
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#if (DAC_USE_WAIT == TRUE) || defined(__DOXYGEN__)
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/**
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* @brief Performs a DAC conversion.
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* @details Performs a synchronous conversion operation.
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* @note The buffer is organized as a matrix of M*N elements where M is the
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* channels number configured into the conversion group and N is the
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* buffer depth. The samples are sequentially written into the buffer
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* with no gaps.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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* @param[in] grpp pointer to a @p DACConversionGroup object
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* @param[out] samples pointer to the samples buffer
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* @param[in] depth buffer depth (matrix rows number). The buffer depth
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* must be one or an even number.
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* @return The operation result.
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* @retval MSG_OK Conversion finished.
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* @retval MSG_RESET The conversion has been stopped using
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* @p acdStopConversion() or @p acdStopConversionI(),
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* the result buffer may contain incorrect data.
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* @retval MSG_TIMEOUT The conversion has been stopped because an hardware
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* error.
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*
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* @api
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*/
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msg_t dacConvert(DACDriver *dacp,
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const DACConversionGroup *grpp,
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dacsample_t *samples,
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size_t depth) {
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msg_t msg;
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osalSysLock();
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dacStartConversionI(dacp, grpp, samples, depth);
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msg = osalThreadSuspendS(&dacp->thread);
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osalSysUnlock();
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return msg;
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}
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#endif /* DAC_USE_WAIT == TRUE */
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#if (DAC_USE_MUTUAL_EXCLUSION == TRUE) || defined(__DOXYGEN__)
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/**
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* @brief Gains exclusive access to the DAC bus.
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* @details This function tries to gain ownership to the DAC bus, if the bus
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* is already being used then the invoking thread is queued.
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* @pre In order to use this function the option @p DAC_USE_MUTUAL_EXCLUSION
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* must be enabled.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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*
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* @api
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*/
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void dacAcquireBus(DACDriver *dacp) {
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osalDbgCheck(dacp != NULL);
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osalMutexLock(&dacp->mutex);
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}
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/**
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* @brief Releases exclusive access to the DAC bus.
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* @pre In order to use this function the option @p DAC_USE_MUTUAL_EXCLUSION
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* must be enabled.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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*
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* @api
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*/
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void dacReleaseBus(DACDriver *dacp) {
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osalDbgCheck(dacp != NULL);
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osalMutexUnlock(&dacp->mutex);
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}
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#endif /* DAC_USE_MUTUAL_EXCLUSION == TRUE */
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#endif /* HAL_USE_DAC == TRUE */
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/** @} */
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