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/*
ChibiOS - Copyright (C) 2006..2018 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_adc.h
* @brief ADC Driver macros and structures.
*
* @addtogroup ADC
* @{
*/
#ifndef HAL_ADC_H
#define HAL_ADC_H
#if (HAL_USE_ADC == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name ADC configuration options
* @{
*/
/**
* @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. */
/*===========================================================================*/
/*===========================================================================*/
/* 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. */
ADC_ERROR = 5 /**< Conversion error. */
} adcstate_t;
/**
* @brief Type of a structure representing an ADC driver.
*/
typedef struct hal_adc_driver ADCDriver;
/**
* @brief Type of a structure representing an ADC driver configuration.
*/
typedef struct hal_adc_config ADCConfig;
/**
* @brief Conversion group configuration structure.
* @details This implementation-dependent structure describes a conversion
* operation.
* @note The use of this configuration structure requires knowledge of
* STM32 ADC cell registers interface, please refer to the STM32
* reference manual for details.
*/
typedef struct hal_adc_configuration_group ADCConversionGroup;
/* Including the low level driver header, it exports information required
for completing types.*/
#include "hal_adc_lld.h"
/**
* @brief Type of an ADC notification callback.
*
* @param[in] adcp pointer to the @p ADCDriver object triggering the
*/
typedef void (*adccallback_t)(ADCDriver *adcp);
/**
* @brief Type of an ADC error callback.
*
* @param[in] adcp pointer to the @p ADCDriver object triggering the
* callback
* @param[in] err ADC error code
*/
typedef void (*adcerrorcallback_t)(ADCDriver *adcp, adcerror_t err);
/**
* @brief Conversion group configuration structure.
* @details This implementation-dependent structure describes a conversion
* operation.
* @note The use of this configuration structure requires knowledge of
* STM32 ADC cell registers interface, please refer to the STM32
* reference manual for details.
*/
struct hal_adc_configuration_group {
/**
* @brief Enables the circular buffer mode for the group.
*/
bool circular;
/**
* @brief Number of the analog channels belonging to the conversion group.
*/
adc_channels_num_t num_channels;
/**
* @brief Callback function associated to the group or @p NULL.
*/
adccallback_t end_cb;
/**
* @brief Error callback or @p NULL.
*/
adcerrorcallback_t error_cb;
/* End of the mandatory fields.*/
adc_lld_configuration_group_fields;
};
/**
* @brief Driver configuration structure.
*/
struct hal_adc_config {
/* End of the mandatory fields.*/
adc_lld_config_fields;
};
/**
* @brief Structure representing an ADC driver.
*/
struct hal_adc_driver {
/**
* @brief Driver state.
*/
adcstate_t state;
/**
* @brief Current configuration data.
*/
const ADCConfig *config;
/**
* @brief Current samples buffer pointer or @p NULL.
*/
adcsample_t *samples;
/**
* @brief Current samples buffer depth or @p 0.
*/
size_t depth;
/**
* @brief Current conversion group pointer or @p NULL.
*/
const ADCConversionGroup *grpp;
#if (ADC_USE_WAIT == TRUE) || defined(__DOXYGEN__)
/**
* @brief Waiting thread.
*/
thread_reference_t thread;
#endif /* ADC_USE_WAIT == TRUE */
#if (ADC_USE_MUTUAL_EXCLUSION == TRUE) || defined(__DOXYGEN__)
/**
* @brief Mutex protecting the peripheral.
*/
mutex_t mutex;
#endif /* ADC_USE_MUTUAL_EXCLUSION == TRUE */
#if defined(ADC_DRIVER_EXT_FIELDS)
ADC_DRIVER_EXT_FIELDS
#endif
/* End of the mandatory fields.*/
adc_lld_driver_fields;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @name Macro Functions
* @{
*/
/**
* @brief Buffer state.
* @note This function is meant to be called from the ADC callback only.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @return The buffer state.
* @retval false if the driver filled/sent the first half of the
* buffer.
* @retval true if the driver filled/sent the second half of the
* buffer.
*
* @special
*/
#define adcIsBufferComplete(adcp) ((bool)((adcp)->state == ADC_COMPLETE))
/** @} */
/**
* @name Low level driver helper macros
* @{
*/
#if (ADC_USE_WAIT == TRUE) || 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) \
osalThreadResumeI(&(adcp)->thread, MSG_RESET)
/**
* @brief Resumes a thread waiting for a conversion completion.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_reset_s(adcp) \
osalThreadResumeS(&(adcp)->thread, MSG_RESET)
/**
* @brief Wakes up the waiting thread.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_wakeup_isr(adcp) { \
osalSysLockFromISR(); \
osalThreadResumeI(&(adcp)->thread, MSG_OK); \
osalSysUnlockFromISR(); \
}
/**
* @brief Wakes up the waiting thread with a timeout message.
*
* @param[in] adcp pointer to the @p ADCDriver object
*
* @notapi
*/
#define _adc_timeout_isr(adcp) { \
osalSysLockFromISR(); \
osalThreadResumeI(&(adcp)->thread, MSG_TIMEOUT); \
osalSysUnlockFromISR(); \
}
#else /* !ADC_USE_WAIT */
#define _adc_reset_i(adcp)
#define _adc_reset_s(adcp)
#define _adc_wakeup_isr(adcp)
#define _adc_timeout_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)->grpp->end_cb != NULL) { \
(adcp)->grpp->end_cb(adcp); \
} \
}
/**
* @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)->grpp->circular) { \
/* Callback handling.*/ \
if ((adcp)->grpp->end_cb != NULL) { \
(adcp)->state = ADC_COMPLETE; \
(adcp)->grpp->end_cb(adcp); \
if ((adcp)->state == ADC_COMPLETE) { \
(adcp)->state = ADC_ACTIVE; \
} \
} \
} \
else { \
/* End conversion.*/ \
adc_lld_stop_conversion(adcp); \
if ((adcp)->grpp->end_cb != NULL) { \
(adcp)->state = ADC_COMPLETE; \
(adcp)->grpp->end_cb(adcp); \
if ((adcp)->state == ADC_COMPLETE) { \
(adcp)->state = ADC_READY; \
(adcp)->grpp = NULL; \
} \
} \
else { \
(adcp)->state = ADC_READY; \
(adcp)->grpp = NULL; \
} \
_adc_wakeup_isr(adcp); \
} \
}
/**
* @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] adcp pointer to the @p ADCDriver object
* @param[in] err platform dependent error code
*
* @notapi
*/
#define _adc_isr_error_code(adcp, err) { \
adc_lld_stop_conversion(adcp); \
if ((adcp)->grpp->error_cb != NULL) { \
(adcp)->state = ADC_ERROR; \
(adcp)->grpp->error_cb(adcp, err); \
if ((adcp)->state == ADC_ERROR) \
(adcp)->state = ADC_READY; \
(adcp)->grpp = NULL; \
} \
else { \
(adcp)->state = ADC_READY; \
(adcp)->grpp = NULL; \
} \
_adc_timeout_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 == TRUE
msg_t adcConvert(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth);
#endif
#if ADC_USE_MUTUAL_EXCLUSION == TRUE
void adcAcquireBus(ADCDriver *adcp);
void adcReleaseBus(ADCDriver *adcp);
#endif
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_ADC == TRUE */
#endif /* HAL_ADC_H */
/** @} */
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