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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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 adc.h
* @brief ADC Driver macros and structures.
*
* @addtogroup ADC
* @{
*/
#ifndef _ADC_H_
#define _ADC_H_
#if HAL_USE_ADC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief Enables synchronous APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(ADC_USE_WAIT) || defined(__DOXYGEN__)
#define ADC_USE_WAIT TRUE
#endif
/**
* @brief Enables the @p adcAcquireBus() and @p adcReleaseBus() APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(ADC_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define ADC_USE_MUTUAL_EXCLUSION TRUE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if ADC_USE_WAIT && !CH_USE_SEMAPHORES
#error "ADC driver requires CH_USE_SEMAPHORES when ADC_USE_WAIT is enabled"
#endif
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver state machine possible states.
*/
typedef enum {
ADC_UNINIT = 0, /**< Not initialized. */
ADC_STOP = 1, /**< Stopped. */
ADC_READY = 2, /**< Ready. */
ADC_ACTIVE = 3, /**< Converting. */
ADC_COMPLETE = 4 /**< Conversion complete. */
} adcstate_t;
#include "adc_lld.h"
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
#if ADC_USE_WAIT || defined(__DOXYGEN__)
/**
* @brief Resumes a thread waiting for a conversion completion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_reset_i(adcp) { \
if ((adcp)->ad_thread != NULL) { \
Thread *tp = (adcp)->ad_thread; \
(adcp)->ad_thread = NULL; \
tp->p_u.rdymsg = RDY_RESET; \
chSchReadyI(tp); \
} \
}
/**
* @brief Resumes a thread waiting for a conversion completion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_reset_s(adcp) { \
if ((adcp)->ad_thread != NULL) { \
Thread *tp = (adcp)->ad_thread; \
(adcp)->ad_thread = NULL; \
chSchWakeupS(tp, RDY_RESET); \
} \
}
/**
* @brief Wakes up the waiting thread.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_wakeup_isr(adcp) { \
if ((adcp)->ad_thread != NULL) { \
Thread *tp = (adcp)->ad_thread; \
(adcp)->ad_thread = NULL; \
chSysLockFromIsr(); \
tp->p_u.rdymsg = RDY_OK; \
chSchReadyI(tp); \
chSysUnlockFromIsr(); \
} \
}
#else /* !ADC_USE_WAIT */
#define _adc_reset_i(adcp)
#define _adc_reset_s(adcp)
#define _adc_wakeup_isr(adcp)
#endif /* !ADC_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] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_isr_half_code(adcp) { \
if ((adcp)->ad_grpp->acg_endcb != NULL) { \
(adcp)->ad_grpp->acg_endcb(adcp, (adcp)->ad_samples, \
(adcp)->ad_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] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_isr_full_code(adcp) { \
if ((adcp)->ad_grpp->acg_circular) { \
/* Callback handling.*/ \
if ((adcp)->ad_grpp->acg_endcb != NULL) { \
if ((adcp)->ad_depth > 1) { \
/* Invokes the callback passing the 2nd half of the buffer.*/ \
size_t half = (adcp)->ad_depth / 2; \
(adcp)->ad_grpp->acg_endcb(adcp, (adcp)->ad_samples + half, half); \
} \
else { \
/* Invokes the callback passing the whole buffer.*/ \
(adcp)->ad_grpp->acg_endcb(adcp, (adcp)->ad_samples, \
(adcp)->ad_depth); \
} \
} \
} \
else { \
/* End conversion.*/ \
adc_lld_stop_conversion(adcp); \
if ((adcp)->ad_grpp->acg_endcb != NULL) { \
(adcp)->ad_state = ADC_COMPLETE; \
if ((adcp)->ad_depth > 1) { \
/* Invokes the callback passing the 2nd half of the buffer.*/ \
size_t half = (adcp)->ad_depth / 2; \
(adcp)->ad_grpp->acg_endcb(adcp, (adcp)->ad_samples + half, half); \
} \
else { \
/* Invokes the callback passing the whole buffer.*/ \
(adcp)->ad_grpp->acg_endcb(adcp, (adcp)->ad_samples, \
(adcp)->ad_depth); \
} \
if ((adcp)->ad_state == ADC_COMPLETE) \
(adcp)->ad_state = ADC_READY; \
} \
(adcp)->ad_grpp = NULL; \
_adc_wakeup_isr(adcp); \
} \
}
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void adcInit(void);
void adcObjectInit(ADCDriver *adcp);
void adcStart(ADCDriver *adcp, const ADCConfig *config);
void adcStop(ADCDriver *adcp);
void adcStartConversion(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth);
void adcStartConversionI(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth);
void adcStopConversion(ADCDriver *adcp);
void adcStopConversionI(ADCDriver *adcp);
#if ADC_USE_WAIT
msg_t adcConvert(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth);
#endif
#if ADC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
void adcAcquireBus(ADCDriver *adcp);
void adcReleaseBus(ADCDriver *adcp);
#endif /* ADC_USE_MUTUAL_EXCLUSION */
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_ADC */
#endif /* _ADC_H_ */
/** @} */
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