diff options
Diffstat (limited to 'os/hal/platforms/STM32/spi_lld.c')
-rw-r--r-- | os/hal/platforms/STM32/spi_lld.c | 368 |
1 files changed, 0 insertions, 368 deletions
diff --git a/os/hal/platforms/STM32/spi_lld.c b/os/hal/platforms/STM32/spi_lld.c deleted file mode 100644 index 0adbe4d8a..000000000 --- a/os/hal/platforms/STM32/spi_lld.c +++ /dev/null @@ -1,368 +0,0 @@ -/*
- 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.c
- * @brief STM32 SPI subsystem low level driver source
- * @addtogroup STM32_SPI
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if CH_HAL_USE_SPI
-
-/*===========================================================================*/
-/* Low Level Driver exported variables. */
-/*===========================================================================*/
-
-#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 variables. */
-/*===========================================================================*/
-
-static uint16_t dummyrx;
-static uint16_t dummytx;
-
-/*===========================================================================*/
-/* Low Level Driver local functions. */
-/*===========================================================================*/
-
-static void spi_stop(SPIDriver *spip) {
-
- /* Stops RX and TX DMA channels.*/
- spip->spd_dmarx->CCR = 0;
- spip->spd_dmatx->CCR = 0;
-
- /* Stops SPI operations.*/
- spip->spd_spi->CR1 &= ~SPI_CR1_SPE;
-
- chSysLockFromIsr();
- chSchReadyI(spip->spd_thread);
- chSysUnlockFromIsr();
-}
-
-static void spi_start_wait(SPIDriver *spip, size_t n,
- const void *txbuf, void *rxbuf) {
- uint32_t ccr;
-
- /* Common DMA setup.*/
- ccr = spip->spd_dmaprio;
- if ((spip->spd_config->spc_cr1 & SPI_CR1_DFF) != 0)
- ccr |= DMA_CCR1_MSIZE_0 | DMA_CCR1_PSIZE_0; /* 16 bits transfer.*/
-
- /* RX DMA setup.*/
- spip->spd_dmarx->CMAR = (uint32_t)rxbuf;
- spip->spd_dmarx->CNDTR = (uint32_t)n;
- spip->spd_dmarx->CCR |= ccr;
-
- /* TX DMA setup.*/
- spip->spd_dmatx->CMAR = (uint32_t)txbuf;
- spip->spd_dmatx->CNDTR = (uint32_t)n;
- spip->spd_dmatx->CCR |= ccr;
-
- /* DMAs start.*/
- spip->spd_dmarx->CCR |= DMA_CCR1_EN;
- spip->spd_dmatx->CCR |= DMA_CCR1_EN;
-
- /* SPI enable.*/
- chSysLock();
- spip->spd_spi->CR1 |= SPI_CR1_SPE;
-
- /* Wait for completion event.*/
- spip->spd_thread = currp;
- chSchGoSleepS(PRSUSPENDED);
- spip->spd_thread = NULL;
- chSysUnlock();
-}
-
-/*===========================================================================*/
-/* Low Level Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if USE_STM32_SPI1 || defined(__DOXYGEN__)
-/**
- * @brief SPI1 RX DMA interrupt handler (channel 2). - */
-CH_IRQ_HANDLER(Vector70) {
-
- CH_IRQ_PROLOGUE();
-
- spi_stop(&SPID1);
- if ((DMA1->ISR & DMA_ISR_TEIF2) != 0) {
- STM32_SPI1_DMA_ERROR_HOOK();
- }
- DMA1->IFCR |= DMA_IFCR_CGIF2 | DMA_IFCR_CTCIF2 |
- DMA_IFCR_CHTIF2 | DMA_IFCR_CTEIF2;
-
- CH_IRQ_EPILOGUE();
-}
-
-/**
- * @brief SPI1 TX DMA interrupt handler (channel 3).
- */
-CH_IRQ_HANDLER(Vector74) {
-
- CH_IRQ_PROLOGUE();
-
- STM32_SPI1_DMA_ERROR_HOOK();
- DMA1->IFCR |= DMA_IFCR_CGIF3 | DMA_IFCR_CTCIF3 |
- DMA_IFCR_CHTIF3 | DMA_IFCR_CTEIF3;
-
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-#if USE_STM32_SPI2 || defined(__DOXYGEN__)
-/**
- * @brief SPI2 RX DMA interrupt handler (channel 4).
- */
-CH_IRQ_HANDLER(Vector78) {
-
- CH_IRQ_PROLOGUE();
-
- spi_stop(&SPID2);
- if ((DMA1->ISR & DMA_ISR_TEIF4) != 0) {
- STM32_SPI2_DMA_ERROR_HOOK();
- }
- DMA1->IFCR |= DMA_IFCR_CGIF4 | DMA_IFCR_CTCIF4 |
- DMA_IFCR_CHTIF4 | DMA_IFCR_CTEIF4;
-
- CH_IRQ_EPILOGUE();
-}
-
-/**
- * @brief SPI2 TX DMA interrupt handler (channel 5).
- */
-CH_IRQ_HANDLER(Vector7C) {
-
- CH_IRQ_PROLOGUE();
-
- STM32_SPI2_DMA_ERROR_HOOK();
- DMA1->IFCR |= DMA_IFCR_CGIF5 | DMA_IFCR_CTCIF5 |
- DMA_IFCR_CHTIF5 | DMA_IFCR_CTEIF5;
-
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-/*===========================================================================*/
-/* Low Level Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level SPI driver initialization. - */
-void spi_lld_init(void) {
-
- dummytx = 0xFFFF;
-
-#if USE_STM32_SPI1
- RCC->APB2RSTR = RCC_APB2RSTR_SPI1RST;
- RCC->APB2RSTR = 0;
- spiObjectInit(&SPID1);
- SPID1.spd_thread = NULL;
- SPID1.spd_spi = SPI1;
- SPID1.spd_dmarx = DMA1_Channel2;
- SPID1.spd_dmatx = DMA1_Channel3;
- SPID1.spd_dmaprio = STM32_SPI1_DMA_PRIORITY << 12;
- GPIOA->CRL = (GPIOA->CRL & 0x000FFFFF) | 0xB4B00000;
-#endif
-
-#if USE_STM32_SPI2
- RCC->APB1RSTR = RCC_APB1RSTR_SPI2RST;
- RCC->APB1RSTR = 0;
- spiObjectInit(&SPID2);
- SPID2.spd_thread = NULL;
- SPID2.spd_spi = SPI2;
- SPID2.spd_dmarx = DMA1_Channel4;
- SPID2.spd_dmatx = DMA1_Channel5;
- SPID2.spd_dmaprio = STM32_SPI2_DMA_PRIORITY << 12;
- GPIOB->CRH = (GPIOB->CRH & 0x000FFFFF) | 0xB4B00000;
-#endif
-}
-
-/**
- * @brief Configures and activates the SPI peripheral.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- */
-void spi_lld_start(SPIDriver *spip) {
-
- /* If in stopped state then enables the SPI and DMA clocks.*/
- if (spip->spd_state == SPI_STOP) {
-#if USE_STM32_SPI1
- if (&SPID1 == spip) {
- dmaEnable(DMA1_ID); /* NOTE: Must be enabled before the IRQs.*/
- NVICEnableVector(DMA1_Channel2_IRQn, STM32_SPI1_IRQ_PRIORITY);
- NVICEnableVector(DMA1_Channel3_IRQn, STM32_SPI1_IRQ_PRIORITY);
- RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
- }
-#endif
-#if USE_STM32_SPI2
- if (&SPID2 == spip) {
- dmaEnable(DMA1_ID); /* NOTE: Must be enabled before the IRQs.*/
- NVICEnableVector(DMA1_Channel4_IRQn, STM32_SPI2_IRQ_PRIORITY);
- NVICEnableVector(DMA1_Channel5_IRQn, STM32_SPI2_IRQ_PRIORITY);
- RCC->APB1ENR |= RCC_APB1ENR_SPI2EN;
- }
-#endif
- }
-
- /* SPI setup.*/
- spip->spd_spi->CR1 = spip->spd_config->spc_cr1 | SPI_CR1_MSTR;
- spip->spd_spi->CR2 = SPI_CR2_SSOE | SPI_CR2_RXDMAEN | SPI_CR2_TXDMAEN;
-
- /* DMA setup.*/
- spip->spd_dmarx->CPAR = (uint32_t)&spip->spd_spi->DR;
- spip->spd_dmatx->CPAR = (uint32_t)&spip->spd_spi->DR;
-}
-
-/**
- * @brief Deactivates the SPI peripheral.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- */
-void spi_lld_stop(SPIDriver *spip) {
-
- /* If in ready state then disables the SPI clock.*/
- if (spip->spd_state == SPI_READY) {
-#if USE_STM32_SPI1
- if (&SPID1 == spip) {
- NVICDisableVector(DMA1_Channel2_IRQn);
- NVICDisableVector(DMA1_Channel3_IRQn);
- dmaDisable(DMA1_ID);
- RCC->APB2ENR &= ~RCC_APB2ENR_SPI1EN;
- }
-#endif
-#if USE_STM32_SPI2
- if (&SPID2 == spip) {
- NVICDisableVector(DMA1_Channel4_IRQn);
- NVICDisableVector(DMA1_Channel5_IRQn);
- dmaDisable(DMA1_ID);
- RCC->APB1ENR &= ~RCC_APB1ENR_SPI2EN;
- }
-#endif
- }
-}
-
-/**
- * @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 Deasserts 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 Ignores data on the SPI bus.
- * @details This function transmits a series of idle words on the SPI bus and
- * ignores the received data. This function can be invoked even
- * when a slave select signal has not been yet asserted.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- * @param[in] n number of words to be ignored
- */
-void spi_lld_ignore(SPIDriver *spip, size_t n) {
-
- spip->spd_dmarx->CCR = DMA_CCR1_TCIE | DMA_CCR1_TEIE;
- spip->spd_dmatx->CCR = DMA_CCR1_DIR | DMA_CCR1_TEIE;
- spi_start_wait(spip, n, &dummytx, &dummyrx);
-}
-
-/**
- * @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[in] n number of words to be exchanged
- * @param[in] txbuf the pointer to the transmit buffer
- * @param[out] rxbuf the pointer to the receive buffer
- *
- * @note The buffers are organized as uint8_t arrays for data sizes below or
- * equal to 8 bits else it is organized as uint16_t arrays.
- */
-void spi_lld_exchange(SPIDriver *spip, size_t n,
- const void *txbuf, void *rxbuf) {
-
- spip->spd_dmarx->CCR = DMA_CCR1_TCIE | DMA_CCR1_MINC | DMA_CCR1_TEIE;
- spip->spd_dmatx->CCR = DMA_CCR1_DIR | DMA_CCR1_MINC | DMA_CCR1_TEIE;
- spi_start_wait(spip, n, txbuf, rxbuf);
-}
-
-/**
- * @brief Sends data ever the SPI bus.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- * @param[in] n number of words to send
- * @param[in] txbuf the pointer to the transmit buffer
- *
- * @note The buffers are organized as uint8_t arrays for data sizes below or
- * equal to 8 bits else it is organized as uint16_t arrays.
- */
-void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {
-
- spip->spd_dmarx->CCR = DMA_CCR1_TCIE | DMA_CCR1_TEIE;
- spip->spd_dmatx->CCR = DMA_CCR1_DIR | DMA_CCR1_MINC | DMA_CCR1_TEIE;
- spi_start_wait(spip, n, txbuf, &dummyrx);
-}
-
-/**
- * @brief Receives data from the SPI bus.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- * @param[in] n number of words to receive
- * @param[out] rxbuf the pointer to the receive buffer
- *
- * @note The buffers are organized as uint8_t arrays for data sizes below or
- * equal to 8 bits else it is organized as uint16_t arrays.
- */
-void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
-
- spip->spd_dmarx->CCR = DMA_CCR1_TCIE | DMA_CCR1_MINC | DMA_CCR1_TEIE;
- spip->spd_dmatx->CCR = DMA_CCR1_DIR | DMA_CCR1_TEIE;
- spi_start_wait(spip, n, &dummytx, rxbuf);
-}
-
-#endif /* CH_HAL_USE_SPI */
-
-/** @} */
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