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/*
ChibiOS/RT - Copyright (C) 2006-2007 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 STM32/spi_lld.h
* @brief STM32 SPI subsystem low level driver header.
* @addtogroup STM32_SPI
* @{
*/
#ifndef _SPI_LLD_H_
#define _SPI_LLD_H_
#if CH_HAL_USE_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief SPI1 driver enable switch.
* @details If set to @p TRUE the support for SPI1 is included.
* @note The default is @p TRUE.
*/
#if !defined(USE_STM32_SPI1) || defined(__DOXYGEN__)
#define USE_STM32_SPI1 TRUE
#endif
/**
* @brief SPI2 driver enable switch.
* @details If set to @p TRUE the support for SPI2 is included.
* @note The default is @p TRUE.
*/
#if !defined(USE_STM32_SPI2) || defined(__DOXYGEN__)
#define USE_STM32_SPI2 TRUE
#endif
/**
* @brief SPI1 DMA priority (0..3|lowest..highest).
* @note The priority level is used for both the TX and RX DMA channels but
* because of the channels ordering the RX channel has always priority
* over the TX channel.
*/
#if !defined(SPI1_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI1_DMA_PRIORITY 2
#endif
/**
* @brief SPI2 DMA priority (0..3|lowest..highest).
* @note The priority level is used for both the TX and RX DMA channels but
* because of the channels ordering the RX channel has always priority
* over the TX channel.
*/
#if !defined(SPI2_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI2_DMA_PRIORITY 2
#endif
/**
* @brief SPI1 interrupt priority level setting.
* @note @p BASEPRI_KERNEL >= @p STM32_SPI1_IRQ_PRIORITY > @p PRIORITY_PENDSV.
*/
#if !defined(STM32_SPI1_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI1_IRQ_PRIORITY 0xA0
#endif
/**
* @brief SPI2 interrupt priority level setting.
* @note @p BASEPRI_KERNEL >= @p STM32_SPI2_IRQ_PRIORITY > @p PRIORITY_PENDSV.
*/
#if !defined(STM32_SPI2_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI2_IRQ_PRIORITY 0xA0
#endif
/**
* @brief SPI1 DMA error hook.
* @note The default action for DMA errors is a system halt because DMA error
* can only happen because programming errors.
*/
#if !defined(STM32_SPI1_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_SPI1_DMA_ERROR_HOOK() chSysHalt()
#endif
/**
* @brief SPI2 DMA error hook.
* @note The default action for DMA errors is a system halt because DMA error
* can only happen because programming errors.
*/
#if !defined(STM32_SPI2_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_SPI2_DMA_ERROR_HOOK() chSysHalt()
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver configuration structure.
*/
typedef struct {
/**
* @brief The chip select line port.
*/
ioportid_t spc_ssport;
/**
* @brief The chip select line pad number.
*/
uint16_t spc_sspad;
/**
* @brief SPI initialization data.
*/
uint16_t spc_cr1;
} SPIConfig;
/**
* @brief Structure representing a SPI driver.
*/
typedef struct {
/**
* @brief Driver state.
*/
spistate_t spd_state;
#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
/**
* @brief Mutex protecting the bus.
*/
Mutex spd_mutex;
#elif CH_USE_SEMAPHORES
Semaphore spd_semaphore;
#endif
#endif /* SPI_USE_MUTUAL_EXCLUSION */
/**
* @brief Current configuration data.
*/
const SPIConfig *spd_config;
/* End of the mandatory fields.*/
/**
* @brief Thread waiting for I/O completion.
*/
Thread *spd_thread;
/**
* @brief Pointer to the SPIx registers block.
*/
SPI_TypeDef *spd_spi;
/**
* @brief Pointer to the receive DMA channel registers block.
*/
DMA_Channel_TypeDef *spd_dmarx;
/**
* @brief Pointer to the transmit DMA channel registers block.
*/
DMA_Channel_TypeDef *spd_dmatx;
/**
* @brief DMA priority bit mask.
*/
uint32_t spd_dmaprio;
} SPIDriver;
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
/** @cond never*/
#if USE_STM32_SPI1
extern SPIDriver SPID1;
#endif
#if USE_STM32_SPI2
extern SPIDriver SPID2;
#endif
#ifdef __cplusplus
extern "C" {
#endif
void spi_lld_init(void);
void spi_lld_start(SPIDriver *spip);
void spi_lld_stop(SPIDriver *spip);
void spi_lld_select(SPIDriver *spip);
void spi_lld_unselect(SPIDriver *spip);
void spi_lld_ignore(SPIDriver *spip, size_t n);
void spi_lld_exchange(SPIDriver *spip, size_t n,
const void *txbuf, void *rxbuf);
void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
#ifdef __cplusplus
}
#endif
/** @endcond*/
#endif /* CH_HAL_USE_SPI */
#endif /* _SPI_LLD_H_ */
/** @} */
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