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/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file hal_dac.h
* @brief DAC Driver macros and structures.
*
* @addtogroup DAC
* @{
*/
#ifndef HAL_DAC_H
#define HAL_DAC_H
#if (HAL_USE_DAC == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name DAC configuration options
* @{
*/
/**
* @brief Enables synchronous APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(DAC_USE_WAIT) || defined(__DOXYGEN__)
#define DAC_USE_WAIT TRUE
#endif
/**
* @brief Enables the @p dacAcquireBus() and @p dacReleaseBus() APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(DAC_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define DAC_USE_MUTUAL_EXCLUSION TRUE
#endif
/** @} */
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver state machine possible states.
*/
typedef enum {
DAC_UNINIT = 0, /**< Not initialized. */
DAC_STOP = 1, /**< Stopped. */
DAC_READY = 2, /**< Ready. */
DAC_ACTIVE = 3, /**< Exchanging data. */
DAC_COMPLETE = 4, /**< Asynchronous operation complete. */
DAC_ERROR = 5 /**< Error. */
} dacstate_t;
#include "dac_lld.h"
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @name Low level driver helper macros
* @{
*/
#if (DAC_USE_WAIT == TRUE) || defined(__DOXYGEN__)
/**
* @brief Waits for operation completion.
* @details This function waits for the driver to complete the current
* operation.
* @pre An operation must be running while the function is invoked.
* @note No more than one thread can wait on a DAC driver using
* this function.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @notapi
*/
#define _dac_wait_s(dacp) osalThreadSuspendS(&(dacp)->thread)
/**
* @brief Resumes a thread waiting for a conversion completion.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @notapi
*/
#define _dac_reset_i(dacp) osalThreadResumeI(&(dacp)->thread, MSG_RESET)
/**
* @brief Resumes a thread waiting for a conversion completion.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @notapi
*/
#define _dac_reset_s(dacp) osalThreadResumeS(&(dacp)->thread, MSG_RESET)
/**
* @brief Wakes up the waiting thread.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @notapi
*/
#define _dac_wakeup_isr(dacp) { \
osalSysLockFromISR(); \
osalThreadResumeI(&(dacp)->thread, MSG_OK); \
osalSysUnlockFromISR(); \
}
/**
* @brief Wakes up the waiting thread with a timeout message.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @notapi
*/
#define _dac_timeout_isr(dacp) { \
osalSysLockFromISR(); \
osalThreadResumeI(&(dacp)->thread, MSG_TIMEOUT); \
osalSysUnlockFromISR(); \
}
#else /* !DAC_USE_WAIT */
#define _dac_wait_s(dacp)
#define _dac_reset_i(dacp)
#define _dac_reset_s(dacp)
#define _dac_wakeup_isr(dacp)
#define _dac_timeout_isr(dacp)
#endif /* !DAC_USE_WAIT */
/**
* @brief Common ISR code, half buffer event.
* @details This code handles the portable part of the ISR code:
* - Callback invocation.
* .
* @note This macro is meant to be used in the low level drivers
* implementation only.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @notapi
*/
#define _dac_isr_half_code(dacp) { \
if ((dacp)->grpp->end_cb != NULL) { \
(dacp)->grpp->end_cb(dacp, (dacp)->samples, (dacp)->depth / 2); \
} \
}
/**
* @brief Common ISR code, full buffer event.
* @details This code handles the portable part of the ISR code:
* - Callback invocation.
* - Waiting thread wakeup, if any.
* - Driver state transitions.
* .
* @note This macro is meant to be used in the low level drivers
* implementation only.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @notapi
*/
#define _dac_isr_full_code(dacp) { \
if ((dacp)->grpp->end_cb != NULL) { \
if ((dacp)->depth > 1) { \
/* Invokes the callback passing the 2nd half of the buffer.*/ \
size_t half = (dacp)->depth / 2; \
size_t half_index = half * (dacp)->grpp->num_channels; \
(dacp)->grpp->end_cb(dacp, (dacp)->samples + half_index, half); \
} \
else { \
/* Invokes the callback passing the whole buffer.*/ \
(dacp)->grpp->end_cb(dacp, (dacp)->samples, (dacp)->depth); \
} \
} \
}
/**
* @brief Common ISR code, error event.
* @details This code handles the portable part of the ISR code:
* - Callback invocation.
* - Waiting thread timeout signaling, if any.
* - Driver state transitions.
* .
* @note This macro is meant to be used in the low level drivers
* implementation only.
*
* @param[in] dacp pointer to the @p DACDriver object
* @param[in] err platform dependent error code
*
* @notapi
*/
#define _dac_isr_error_code(dacp, err) { \
dac_lld_stop_conversion(dacp); \
if ((dacp)->grpp->error_cb != NULL) { \
(dacp)->state = DAC_ERROR; \
(dacp)->grpp->error_cb(dacp, err); \
if ((dacp)->state == DAC_ERROR) \
(dacp)->state = DAC_READY; \
} \
(dacp)->grpp = NULL; \
_dac_timeout_isr(dacp); \
}
/** @} */
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void dacInit(void);
void dacObjectInit(DACDriver *dacp);
void dacStart(DACDriver *dacp, const DACConfig *config);
void dacStop(DACDriver *dacp);
void dacPutChannelX(DACDriver *dacp,
dacchannel_t channel,
dacsample_t sample);
void dacStartConversion(DACDriver *dacp, const DACConversionGroup *grpp,
const dacsample_t *samples, size_t depth);
void dacStartConversionI(DACDriver *dacp, const DACConversionGroup *grpp,
const dacsample_t *samples, size_t depth);
void dacStopConversion(DACDriver *dacp);
void dacStopConversionI(DACDriver *dacp);
#if DAC_USE_WAIT
msg_t dacConvert(DACDriver *dacp, const DACConversionGroup *grpp,
const dacsample_t *samples, size_t depth);
#endif
#if DAC_USE_MUTUAL_EXCLUSION
void dacAcquireBus(DACDriver *dacp);
void dacReleaseBus(DACDriver *dacp);
#endif
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_DAC == TRUE */
#endif /* HAL_DAC_H */
/** @} */
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