208 lines
5.6 KiB
C
208 lines
5.6 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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LPC43xx DAC driver - Copyright (C) 2013 Marcin Jokel
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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 LPC43xx/dac_lld.h
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* @brief LPC43xx 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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#define DACR_BIAS (1UL << 16)
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#define DACCTRL_INT_DMA_REQ (1UL << 0)
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#define DACCTRL_DBLBUF_ENA (1UL << 1)
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#define DACCTRL_CNT_ENA (1UL << 2)
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#define DACCTRL_DMA_ENA (1UL << 3)
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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 DMA stream used for DAC CHN1 TX operations.
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* @note This option is only available on platforms with enhanced DMA.
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*/
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#if !defined(LPC_DAC_DMA_CHANNEL) || defined(__DOXYGEN__)
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#define LPC_DAC_DMA_CHANNEL DMA_CHANNEL5
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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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#if !defined(LPC_DMA_REQUIRED)
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#define LPC_DMA_REQUIRED
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#endif
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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 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 Type representing a DAC sample.
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*/
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typedef uint32_t dacsample_t;
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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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*/
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typedef void (*dacendcallback_t)(DACDriver *dacp, const dacsample_t * samples, size_t pos);
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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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*/
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typedef void (*dacerrcallback_t)(DACDriver *dacp, uint32_t flags);
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/**
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* @brief DAC Conversion group structure.
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*/
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typedef struct {
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/**
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* @brief Number of DAC channels.
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*/
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uint16_t num_channels;
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/**
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* @brief Operation complete callback or @p NULL.
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*/
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dacendcallback_t end_cb;
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/**
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* @brief Error handling callback or @p NULL.
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*/
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dacerrcallback_t error_cb;
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/**
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* @brief Error handling callback or @p NULL.
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*/
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bool circular;
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} DACConversionGroup;
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/**
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* @brief Driver configuration structure.
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*/
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typedef struct {
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/**
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* @brief Timer frequency in Hz.
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*/
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uint32_t frequency;
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/* End of the mandatory fields.*/
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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 Conversion group.
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*/
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const DACConversionGroup *grpp;
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/**
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* @brief Samples buffer pointer.
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*/
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const dacsample_t *samples;
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/**
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* @brief Samples buffer size.
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*/
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uint16_t depth;
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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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#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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* @brief Half buffer indicator.
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*/
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bool_t half_buffer;
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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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extern DACDriver DACD1;
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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_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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