161 lines
4.9 KiB
C
161 lines
4.9 KiB
C
/*
|
|
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 templates/spi_lld.c
|
|
* @brief SPI Driver subsystem low level driver source template
|
|
* @addtogroup SPI_LLD
|
|
* @{
|
|
*/
|
|
|
|
#include <ch.h>
|
|
#include <spi.h>
|
|
|
|
#include "nvic.h"
|
|
#include "board.h"
|
|
|
|
#if USE_STM32_SPI1 || defined(__DOXYGEN__)
|
|
/** @brief SPI1 driver identifier.*/
|
|
SPIDriver SPID1;
|
|
#endif
|
|
|
|
#if USE_STM32_SPI2 || defined(__DOXYGEN__)
|
|
/** @brief SPI2 driver identifier.*/
|
|
SPIDriver SPID2;
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Low Level Driver local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Low Level Driver interrupt handlers. */
|
|
/*===========================================================================*/
|
|
|
|
#if USE_STM32_SPI1 || defined(__DOXYGEN__)
|
|
CH_IRQ_HANDLER(Vector70) {
|
|
|
|
CH_IRQ_PROLOGUE();
|
|
|
|
CH_IRQ_EPILOGUE();
|
|
}
|
|
#endif
|
|
|
|
#if USE_STM32_SPI2 || defined(__DOXYGEN__)
|
|
CH_IRQ_HANDLER(Vector78) {
|
|
|
|
CH_IRQ_PROLOGUE();
|
|
|
|
CH_IRQ_EPILOGUE();
|
|
}
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Low Level Driver exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Low level SPI driver initialization.
|
|
*/
|
|
void spi_lld_init(void) {
|
|
|
|
#if USE_STM32_SPI1
|
|
spiObjectInit(&SPID1);
|
|
SPID1.spd_spi = SPI1;
|
|
SPID1.spd_dmarx = DMA1_Channel2;
|
|
SPID1.spd_dmatx = DMA1_Channel3;
|
|
SPID1.spd_dmaprio = SPI1_DMA_PRIORITY << 12;
|
|
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
|
|
GPIOA->CRH = (GPIOA->CRH & 0x000FFFFF) | 0xB4B00000;
|
|
#endif
|
|
|
|
#if USE_STM32_SPI2
|
|
spiObjectInit(&SPID2);
|
|
SPID2.spd_spi = SPI2;
|
|
SPID2.spd_dmarx = DMA1_Channel4;
|
|
SPID2.spd_dmatx = DMA1_Channel5;
|
|
SPID2.spd_dmaprio = SPI2_DMA_PRIORITY << 12;
|
|
RCC->APB1ENR |= RCC_APB1ENR_SPI2EN;
|
|
GPIOB->CRL = (GPIOB->CRL & 0x000FFFFF) | 0xB4B00000;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Low level SPI bus setup.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*/
|
|
void spi_lld_setup(SPIDriver *spip) {
|
|
|
|
spip->spd_spi->CR1 = spip->spd_config->spc_cr1;
|
|
}
|
|
|
|
/**
|
|
* @brief Asserts the slave select signal and prepares for transfers.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*/
|
|
void spi_lld_select(SPIDriver *spip) {
|
|
|
|
palClearPad(spip->spd_config->spc_ssport, spip->spd_config->spc_sspad);
|
|
}
|
|
|
|
/**
|
|
* @brief De-asserts the slave select signal.
|
|
* @details The previously selected peripheral is unselected.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*/
|
|
void spi_lld_unselect(SPIDriver *spip) {
|
|
|
|
palSetPad(spip->spd_config->spc_ssport, spip->spd_config->spc_sspad);
|
|
}
|
|
|
|
/**
|
|
* @brief Exchanges data on the SPI bus.
|
|
* @details This function performs a simultaneous transmit/receive operation.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
* @param n number of words to be exchanged
|
|
* @param rxbuf the pointer to the receive buffer, if @p NULL is specified then
|
|
* the input data is discarded.
|
|
* Note that the buffer is organized as an uint8_t array for
|
|
* data sizes below or equal to 8 bits else it is organized as
|
|
* an uint16_t array.
|
|
* @param txbuf the pointer to the transmit buffer, if @p NULL is specified all
|
|
* ones are transmitted.
|
|
* Note that the buffer is organized as an uint8_t array for
|
|
* data sizes below or equal to 8 bits else it is organized as
|
|
* an uint16_t array.
|
|
*/
|
|
void spi_lld_exchange(SPIDriver *spip, size_t n, void *rxbuf, void *txbuf) {
|
|
|
|
/*
|
|
* DMA setup.
|
|
*/
|
|
spip->spd_dmarx->CNDTR = (uint32_t)n;
|
|
spip->spd_dmarx->CPAR = (uint32_t)&spip->spd_spi->DR;
|
|
spip->spd_dmarx->CMAR = (uint32_t)rxbuf;
|
|
spip->spd_dmarx->CCR = spip->spd_dmaprio |
|
|
DMA_CCR1_MSIZE_0 | DMA_CCR1_MSIZE_0 |
|
|
DMA_CCR1_MINC | DMA_CCR1_TEIE | DMA_CCR1_TCIE;
|
|
}
|
|
|
|
/** @} */
|