212 lines
6.4 KiB
C
212 lines
6.4 KiB
C
/*
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ChibiOS/HAL - Copyright (C) 2006-2014 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 adc_lld.h
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* @brief PLATFORM ADC subsystem low level driver header.
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*
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* @addtogroup ADC
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* @{
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*/
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#ifndef _ADC_LLD_H_
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#define _ADC_LLD_H_
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#if HAL_USE_ADC || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @name PLATFORM configuration options
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* @{
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*/
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/**
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* @brief ADC1 driver enable switch.
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* @details If set to @p TRUE the support for ADC1 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(PLATFORM_ADC_USE_ADC1) || defined(__DOXYGEN__)
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#define PLATFORM_ADC_USE_ADC1 FALSE
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#endif
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/** @} */
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief ADC sample data type.
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*/
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typedef uint16_t adcsample_t;
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/**
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* @brief Channels number in a conversion group.
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*/
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typedef uint16_t adc_channels_num_t;
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/**
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* @brief Possible ADC failure causes.
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* @note Error codes are architecture dependent and should not relied
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* upon.
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*/
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typedef enum {
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ADC_ERR_DMAFAILURE = 0, /**< DMA operations failure. */
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ADC_ERR_OVERFLOW = 1, /**< ADC overflow condition. */
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ADC_ERR_AWD = 2 /**< Analog watchdog triggered. */
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} adcerror_t;
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/**
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* @brief Type of a structure representing an ADC driver.
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*/
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typedef struct ADCDriver ADCDriver;
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/**
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* @brief ADC notification callback type.
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*
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* @param[in] adcp pointer to the @p ADCDriver object triggering the
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* callback
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* @param[in] buffer pointer to the most recent samples data
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* @param[in] n number of buffer rows available starting from @p buffer
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*/
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typedef void (*adccallback_t)(ADCDriver *adcp, adcsample_t *buffer, size_t n);
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/**
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* @brief ADC error callback type.
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*
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* @param[in] adcp pointer to the @p ADCDriver object triggering the
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* callback
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* @param[in] err ADC error code
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*/
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typedef void (*adcerrorcallback_t)(ADCDriver *adcp, adcerror_t err);
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/**
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* @brief Conversion group configuration structure.
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* @details This implementation-dependent structure describes a conversion
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* operation.
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* @note The use of this configuration structure requires knowledge of
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* PLATFORM ADC cell registers interface, please refer to the PLATFORM
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* reference manual for details.
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*/
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typedef struct {
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/**
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* @brief Enables the circular buffer mode for the group.
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*/
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bool circular;
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/**
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* @brief Number of the analog channels belonging to the conversion group.
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*/
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adc_channels_num_t num_channels;
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/**
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* @brief Callback function associated to the group or @p NULL.
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*/
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adccallback_t end_cb;
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/**
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* @brief Error callback or @p NULL.
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*/
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adcerrorcallback_t error_cb;
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/* End of the mandatory fields.*/
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} ADCConversionGroup;
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/**
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* @brief Driver configuration structure.
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* @note It could be empty on some architectures.
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*/
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typedef struct {
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uint32_t dummy;
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} ADCConfig;
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/**
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* @brief Structure representing an ADC driver.
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*/
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struct ADCDriver {
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/**
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* @brief Driver state.
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*/
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adcstate_t state;
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/**
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* @brief Current configuration data.
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*/
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const ADCConfig *config;
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/**
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* @brief Current samples buffer pointer or @p NULL.
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*/
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adcsample_t *samples;
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/**
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* @brief Current samples buffer depth or @p 0.
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*/
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size_t depth;
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/**
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* @brief Current conversion group pointer or @p NULL.
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*/
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const ADCConversionGroup *grpp;
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#if ADC_USE_WAIT || defined(__DOXYGEN__)
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/**
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* @brief Waiting thread.
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*/
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thread_reference_t thread;
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#endif
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#if ADC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
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/**
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* @brief Mutex protecting the peripheral.
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*/
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mutex_t mutex;
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#endif /* ADC_USE_MUTUAL_EXCLUSION */
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#if defined(ADC_DRIVER_EXT_FIELDS)
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ADC_DRIVER_EXT_FIELDS
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#endif
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/* End of the mandatory fields.*/
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};
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if PLATFORM_ADC_USE_ADC1 && !defined(__DOXYGEN__)
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extern ADCDriver ADCD1;
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void adc_lld_init(void);
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void adc_lld_start(ADCDriver *adcp);
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void adc_lld_stop(ADCDriver *adcp);
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void adc_lld_start_conversion(ADCDriver *adcp);
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void adc_lld_stop_conversion(ADCDriver *adcp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_ADC */
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#endif /* _ADC_LLD_H_ */
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/** @} */
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