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/*
ChibiOS/HAL - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013,2014 Giovanni Di Sirio.
This file is part of ChibiOS/HAL
ChibiOS/HAL is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file dac.h
* @brief DAC Driver macros and structures.
*
* @addtogroup DAC
* @{
*/
#ifndef _DAC_H_
#define _DAC_H_
#if HAL_USE_DAC || 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 || 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->circular) { \
/* Callback handling.*/ \
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); \
} \
} \
} \
else { \
/* End conversion.*/ \
dac_lld_stop_conversion(dacp); \
if ((dacp)->grpp->end_cb != NULL) { \
(dacp)->state = DAC_COMPLETE; \
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); \
} \
if ((dacp)->state == DAC_COMPLETE) { \
(dacp)->state = DAC_READY; \
(dacp)->grpp = NULL; \
} \
} \
else { \
(dacp)->state = DAC_READY; \
(dacp)->grpp = NULL; \
} \
_dac_wakeup_isr(dacp); \
} \
}
/**
* @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 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 || defined(__DOXYGEN__)
msg_t dacConvert(DACDriver *dacp, const DACConversionGroup *grpp,
const dacsample_t *samples, size_t depth);
#endif /* DAC_USE_WAIT */
#if DAC_USE_MUTUAL_EXCLUSION
void dacAcquireBus(DACDriver *dacp);
void dacReleaseBus(DACDriver *dacp);
#endif /* DAC_USE_MUTUAL_EXCLUSION */
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_DAC */
#endif /* _DAC_H_ */
/** @} */
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