218 lines
6.4 KiB
C
218 lines
6.4 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file STM32F37x/dac_lld.h
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* @brief STM32F37x DAC subsystem low level driver header.
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*
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* @addtogroup DAC
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* @{
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*/
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#ifndef _DAC_LLD_H_
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#define _DAC_LLD_H_
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#if HAL_USE_DAC || 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 Configuration options
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* @{
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*/
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/**
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* @brief DAC1 driver enable switch.
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* @details If set to @p TRUE the support for DAC1 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(PLATFORM_DAC_USE_DAC1) || defined(__DOXYGEN__)
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#define PLATFORM_DAC_USE_DAC1 FALSE
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#endif
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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 DAC sample data type.
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*/
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typedef uint16_t dacsample_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 dac_channels_num_t;
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/**
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* @brief Possible DAC 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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DAC_ERR_DMAFAILURE = 0, /**< DMA operations failure. */
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DAC_ERR_UNDERRUN = 1 /**< ADC overflow condition. */
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} dacerror_t;
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/**
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* @brief Type of a structure representing an DAC driver.
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*/
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typedef struct DACDriver DACDriver;
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/**
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* @brief DAC notification callback type.
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*
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* @param[in] dacp pointer to the @p DACDriver 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 (*daccallback_t)(DACDriver *dacp, dacsample_t *buffer, size_t n);
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/**
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* @brief DAC error callback type.
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*
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* @param[in] dacp pointer to the @p DACDriver object triggering the
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* callback
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* @param[in] err DAC error code
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*/
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typedef void (*dacerrorcallback_t)(DACDriver *dacp, dacerror_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 Implementations may extend this structure to contain more,
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* architecture dependent, fields.
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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_t 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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dac_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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daccallback_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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dacerrorcallback_t error_cb;
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/* End of the mandatory fields.*/
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} DACConversionGroup;
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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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} DACConfig;
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/**
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* @brief Structure representing a DAC driver.
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*/
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struct DACDriver {
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/**
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* @brief Driver state.
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*/
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dacstate_t state;
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/**
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* @brief Current configuration data.
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*/
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const DACConfig *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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const dacsample_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 DACConversionGroup *grpp;
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#if DAC_USE_WAIT || defined(__DOXYGEN__)
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/**
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* @brief Waiting thread.
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*/
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Thread *thread;
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#endif /* DAC_USE_WAIT */
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#if DAC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
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#if CH_USE_MUTEXES || defined(__DOXYGEN__)
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/**
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* @brief Mutex protecting the bus.
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*/
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Mutex mutex;
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#elif CH_USE_SEMAPHORES
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Semaphore semaphore;
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#endif
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#endif /* DAC_USE_MUTUAL_EXCLUSION */
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#if defined(DAC_DRIVER_EXT_FIELDS)
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DAC_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_DAC_USE_DAC1 && !defined(__DOXYGEN__)
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extern DACDriver DACD1;
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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 dac_lld_init(void);
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void dac_lld_start(DACDriver *dacp);
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void dac_lld_stop(DACDriver *dacp);
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void dac_lld_send(DACDriver *dacp);
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void dac_lld_start_conversion(DACDriver *dacp);
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void dac_lld_stop_conversion(DACDriver *dacp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_DAC */
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#endif /* _DAC_LLD_H_ */
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/** @} */
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