diff options
Diffstat (limited to 'os/hal/ports/KINETIS/K20x/hal_spi_lld.c')
| -rw-r--r-- | os/hal/ports/KINETIS/K20x/hal_spi_lld.c | 539 |
1 files changed, 0 insertions, 539 deletions
diff --git a/os/hal/ports/KINETIS/K20x/hal_spi_lld.c b/os/hal/ports/KINETIS/K20x/hal_spi_lld.c deleted file mode 100644 index 29ab4e8..0000000 --- a/os/hal/ports/KINETIS/K20x/hal_spi_lld.c +++ /dev/null @@ -1,539 +0,0 @@ -/*
- ChibiOS - Copyright (C) 2014-2015 Fabio Utzig
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-*/
-
-/**
- * @file KINETIS/spi_lld.c
- * @brief KINETIS SPI subsystem low level driver source.
- *
- * @addtogroup SPI
- * @{
- */
-
-#include "hal.h"
-
-#if HAL_USE_SPI || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-#if !defined(KINETIS_SPI0_RX_DMA_IRQ_PRIORITY)
-#define KINETIS_SPI0_RX_DMA_IRQ_PRIORITY 8
-#endif
-
-#if !defined(KINETIS_SPI0_RX_DMAMUX_CHANNEL)
-#define KINETIS_SPI0_RX_DMAMUX_CHANNEL 0
-#endif
-
-#if !defined(KINETIS_SPI0_RX_DMA_CHANNEL)
-#define KINETIS_SPI0_RX_DMA_CHANNEL 0
-#endif
-
-#if !defined(KINETIS_SPI0_TX_DMAMUX_CHANNEL)
-#define KINETIS_SPI0_TX_DMAMUX_CHANNEL 1
-#endif
-
-#if !defined(KINETIS_SPI0_TX_DMA_CHANNEL)
-#define KINETIS_SPI0_TX_DMA_CHANNEL 1
-#endif
-
-#if !defined(KINETIS_SPI1_RX_DMA_IRQ_PRIORITY)
-#define KINETIS_SPI1_RX_DMA_IRQ_PRIORITY 8
-#endif
-
-#if !defined(KINETIS_SPI1_RX_DMAMUX_CHANNEL)
-#define KINETIS_SPI1_RX_DMAMUX_CHANNEL 0
-#endif
-
-#if !defined(KINETIS_SPI1_RX_DMA_CHANNEL)
-#define KINETIS_SPI1_RX_DMA_CHANNEL 0
-#endif
-
-#if !defined(KINETIS_SPI1_TX_DMAMUX_CHANNEL)
-#define KINETIS_SPI1_TX_DMAMUX_CHANNEL 1
-#endif
-
-#if !defined(KINETIS_SPI1_TX_DMA_CHANNEL)
-#define KINETIS_SPI1_TX_DMA_CHANNEL 1
-#endif
-
-#if KINETIS_SPI_USE_SPI0
-#define DMAMUX_SPI_RX_SOURCE 16
-#define DMAMUX_SPI_TX_SOURCE 17
-#endif
-
-#if KINETIS_SPI_USE_SPI1
-#define DMAMUX_SPI_RX_SOURCE 18
-#define DMAMUX_SPI_TX_SOURCE 19
-#endif
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-/** @brief SPI0 driver identifier.*/
-#if KINETIS_SPI_USE_SPI0 || defined(__DOXYGEN__)
-SPIDriver SPID1;
-#endif
-
-/** @brief SPI1 driver identifier.*/
-#if KINETIS_SPI_USE_SPI1 || defined(__DOXYGEN__)
-SPIDriver SPID2;
-#endif
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-/* Use a dummy byte as the source/destination when a buffer is not provided */
-/* Note: The MMC driver relies on 0xFF being sent for dummy bytes. */
-static volatile uint16_t dmaRxDummy;
-static uint16_t dmaTxDummy = 0xFFFF;
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-static void spi_start_xfer(SPIDriver *spip, bool polling)
-{
- /*
- * Enable the DSPI peripheral in master mode.
- * Clear the TX and RX FIFOs.
- * */
- spip->spi->MCR = SPIx_MCR_MSTR | SPIx_MCR_CLR_TXF | SPIx_MCR_CLR_RXF;
-
- /* If we are not polling then enable DMA */
- if (!polling) {
-
- /* Enable receive dma and transmit dma */
- spip->spi->RSER = SPIx_RSER_RFDF_DIRS | SPIx_RSER_RFDF_RE |
- SPIx_RSER_TFFF_RE | SPIx_RSER_TFFF_DIRS;
-
- /* Configure RX DMA */
- if (spip->rxbuf) {
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].DADDR = (uint32_t)spip->rxbuf;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].DOFF = spip->word_size;
- } else {
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].DADDR = (uint32_t)&dmaRxDummy;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].DOFF = 0;
- }
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].BITER_ELINKNO = spip->count;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].CITER_ELINKNO = spip->count;
-
- /* Enable Request Register (ERQ) for RX by writing 0 to SERQ */
- DMA->SERQ = KINETIS_SPI0_RX_DMA_CHANNEL;
-
- /* Configure TX DMA */
- if (spip->txbuf) {
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].SADDR = (uint32_t)spip->txbuf;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].SOFF = spip->word_size;
- } else {
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].SADDR = (uint32_t)&dmaTxDummy;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].SOFF = 0;
- }
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].BITER_ELINKNO = spip->count;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].CITER_ELINKNO = spip->count;
-
- /* Enable Request Register (ERQ) for TX by writing 1 to SERQ */
- DMA->SERQ = KINETIS_SPI0_TX_DMA_CHANNEL;
- }
-}
-
-static void spi_stop_xfer(SPIDriver *spip)
-{
- /* Halt the DSPI peripheral */
- spip->spi->MCR = SPIx_MCR_MSTR | SPIx_MCR_HALT;
-
- /* Clear all the flags which are currently set. */
- spip->spi->SR |= spip->spi->SR;
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if KINETIS_SPI_USE_SPI0 || defined(__DOXYGEN__)
-
-OSAL_IRQ_HANDLER(KINETIS_DMA0_IRQ_VECTOR) {
- OSAL_IRQ_PROLOGUE();
-
- /* Clear bit 0 in Interrupt Request Register (INT) by writing 0 to CINT */
- DMA->CINT = KINETIS_SPI0_RX_DMA_CHANNEL;
-
- spi_stop_xfer(&SPID1);
-
- _spi_isr_code(&SPID1);
-
- OSAL_IRQ_EPILOGUE();
-}
-
-#endif
-
-#if KINETIS_SPI_USE_SPI1 || defined(__DOXYGEN__)
-
-OSAL_IRQ_HANDLER(KINETIS_DMA0_IRQ_VECTOR) {
- OSAL_IRQ_PROLOGUE();
-
- /* Clear bit 0 in Interrupt Request Register (INT) by writing 0 to CINT */
- DMA->CINT = KINETIS_SPI1_RX_DMA_CHANNEL;
-
- spi_stop_xfer(&SPID2);
-
- _spi_isr_code(&SPID2);
-
- OSAL_IRQ_EPILOGUE();
-}
-
-#endif
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level SPI driver initialization.
- *
- * @notapi
- */
-void spi_lld_init(void) {
-#if KINETIS_SPI_USE_SPI0
- spiObjectInit(&SPID1);
-#endif
-#if KINETIS_SPI_USE_SPI1
- spiObjectInit(&SPID2);
-#endif
-}
-
-/**
- * @brief Configures and activates the SPI peripheral.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- *
- * @notapi
- */
-void spi_lld_start(SPIDriver *spip) {
-
- /* If in stopped state then enables the SPI and DMA clocks.*/
- if (spip->state == SPI_STOP) {
-
-#if KINETIS_SPI_USE_SPI0
- if (&SPID1 == spip) {
-
- /* Enable the clock for SPI0 */
- SIM->SCGC6 |= SIM_SCGC6_SPI0;
-
- SPID1.spi = SPI0;
-
- if (spip->config->tar0) {
- spip->spi->CTAR[0] = spip->config->tar0;
- } else {
- spip->spi->CTAR[0] = KINETIS_SPI_TAR0_DEFAULT;
- }
- }
-#endif
-
-#if KINETIS_SPI_USE_SPI1
- if (&SPID2 == spip) {
-
- /* Enable the clock for SPI0 */
- SIM->SCGC6 |= SIM_SCGC6_SPI1;
-
- SPID2.spi = SPI1;
-
- if (spip->config->tar0) {
- spip->spi->CTAR[0] = spip->config->tar0;
- } else {
- spip->spi->CTAR[0] = KINETIS_SPI_TAR0_DEFAULT;
- }
- }
-#endif
-
- nvicEnableVector(DMA0_IRQn, KINETIS_SPI0_RX_DMA_IRQ_PRIORITY);
-
- SIM->SCGC6 |= SIM_SCGC6_DMAMUX;
- SIM->SCGC7 |= SIM_SCGC7_DMA;
-
- /* Clear DMA error flags */
- DMA->ERR = 0x0F;
-
-#if KINETIS_SPI_USE_SPI0
- /* Rx, select SPI Rx FIFO */
- DMAMUX->CHCFG[KINETIS_SPI0_RX_DMAMUX_CHANNEL] = DMAMUX_CHCFGn_ENBL |
- DMAMUX_CHCFGn_SOURCE(DMAMUX_SPI_RX_SOURCE);
-
- /* Tx, select SPI Tx FIFO */
- DMAMUX->CHCFG[KINETIS_SPI0_TX_DMAMUX_CHANNEL] = DMAMUX_CHCFGn_ENBL |
- DMAMUX_CHCFGn_SOURCE(DMAMUX_SPI_TX_SOURCE);
-
- /* Extract the frame size from the TAR */
- uint16_t frame_size = ((spip->spi->CTAR[0] >> SPIx_CTARn_FMSZ_SHIFT) &
- SPIx_CTARn_FMSZ_MASK) + 1;
-
- /* DMA transfer size is 16 bits for a frame size > 8 bits */
- uint16_t dma_size = frame_size > 8 ? 1 : 0;
-
- /* DMA word size is 2 for a 16 bit frame size */
- spip->word_size = frame_size > 8 ? 2 : 1;
-
- /* configure DMA RX fixed values */
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].SADDR = (uint32_t)&SPI0->POPR;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].SOFF = 0;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].SLAST = 0;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].DLASTSGA = 0;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].ATTR = DMA_ATTR_SSIZE(dma_size) |
- DMA_ATTR_DSIZE(dma_size);
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].NBYTES_MLNO = spip->word_size;
- DMA->TCD[KINETIS_SPI0_RX_DMA_CHANNEL].CSR = DMA_CSR_DREQ_MASK |
- DMA_CSR_INTMAJOR_MASK;
-
- /* configure DMA TX fixed values */
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].SLAST = 0;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].DADDR = (uint32_t)&SPI0->PUSHR;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].DOFF = 0;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].DLASTSGA = 0;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].ATTR = DMA_ATTR_SSIZE(dma_size) |
- DMA_ATTR_DSIZE(dma_size);
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].NBYTES_MLNO = spip->word_size;
- DMA->TCD[KINETIS_SPI0_TX_DMA_CHANNEL].CSR = DMA_CSR_DREQ_MASK;
-#endif
-
-#if KINETIS_SPI_USE_SPI1
- /* Rx, select SPI Rx FIFO */
- DMAMUX->CHCFG[KINETIS_SPI1_RX_DMAMUX_CHANNEL] = DMAMUX_CHCFGn_ENBL |
- DMAMUX_CHCFGn_SOURCE(DMAMUX_SPI_RX_SOURCE);
-
- /* Tx, select SPI Tx FIFO */
- DMAMUX->CHCFG[KINETIS_SPI1_TX_DMAMUX_CHANNEL] = DMAMUX_CHCFGn_ENBL |
- DMAMUX_CHCFGn_SOURCE(DMAMUX_SPI_TX_SOURCE);
-
- /* Extract the frame size from the TAR */
- uint16_t frame_size = ((spip->spi->CTAR[0] >> SPIx_CTARn_FMSZ_SHIFT) &
- SPIx_CTARn_FMSZ_MASK) + 1;
-
- /* DMA transfer size is 16 bits for a frame size > 8 bits */
- uint16_t dma_size = frame_size > 8 ? 1 : 0;
-
- /* DMA word size is 2 for a 16 bit frame size */
- spip->word_size = frame_size > 8 ? 2 : 1;
-
- /* configure DMA RX fixed values */
- DMA->TCD[KINETIS_SPI1_RX_DMA_CHANNEL].SADDR = (uint32_t)&SPI1->POPR;
- DMA->TCD[KINETIS_SPI1_RX_DMA_CHANNEL].SOFF = 0;
- DMA->TCD[KINETIS_SPI1_RX_DMA_CHANNEL].SLAST = 0;
- DMA->TCD[KINETIS_SPI1_RX_DMA_CHANNEL].DLASTSGA = 0;
- DMA->TCD[KINETIS_SPI1_RX_DMA_CHANNEL].ATTR = DMA_ATTR_SSIZE(dma_size) |
- DMA_ATTR_DSIZE(dma_size);
- DMA->TCD[KINETIS_SPI1_RX_DMA_CHANNEL].NBYTES_MLNO = spip->word_size;
- DMA->TCD[KINETIS_SPI1_RX_DMA_CHANNEL].CSR = DMA_CSR_DREQ_MASK |
- DMA_CSR_INTMAJOR_MASK;
-
- /* configure DMA TX fixed values */
- DMA->TCD[KINETIS_SPI1_TX_DMA_CHANNEL].SLAST = 0;
- DMA->TCD[KINETIS_SPI1_TX_DMA_CHANNEL].DADDR = (uint32_t)&SPI1->PUSHR;
- DMA->TCD[KINETIS_SPI1_TX_DMA_CHANNEL].DOFF = 0;
- DMA->TCD[KINETIS_SPI1_TX_DMA_CHANNEL].DLASTSGA = 0;
- DMA->TCD[KINETIS_SPI1_TX_DMA_CHANNEL].ATTR = DMA_ATTR_SSIZE(dma_size) |
- DMA_ATTR_DSIZE(dma_size);
- DMA->TCD[KINETIS_SPI1_TX_DMA_CHANNEL].NBYTES_MLNO = spip->word_size;
- DMA->TCD[KINETIS_SPI1_TX_DMA_CHANNEL].CSR = DMA_CSR_DREQ_MASK;
-#endif
- }
-}
-
-/**
- * @brief Deactivates the SPI peripheral.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- *
- * @notapi
- */
-void spi_lld_stop(SPIDriver *spip) {
-
- /* If in ready state then disables the SPI clock.*/
- if (spip->state == SPI_READY) {
-
- nvicDisableVector(DMA0_IRQn);
-
- SIM->SCGC7 &= ~SIM_SCGC7_DMA;
- SIM->SCGC6 &= ~SIM_SCGC6_DMAMUX;
-
-#if KINETIS_SPI_USE_SPI0
- if (&SPID1 == spip) {
- /* SPI halt.*/
- spip->spi->MCR |= SPIx_MCR_HALT;
- }
-
- /* Disable the clock for SPI0 */
- SIM->SCGC6 &= ~SIM_SCGC6_SPI0;
-#endif
-
-#if KINETIS_SPI_USE_SPI1
- if (&SPID2 == spip) {
- /* SPI halt.*/
- spip->spi->MCR |= SPIx_MCR_HALT;
- }
-
- /* Disable the clock for SPI1 */
- SIM->SCGC6 &= ~SIM_SCGC6_SPI1;
-#endif
- }
-}
-
-/**
- * @brief Asserts the slave select signal and prepares for transfers.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- *
- * @notapi
- */
-void spi_lld_select(SPIDriver *spip) {
-
- palClearPad(spip->config->ssport, spip->config->sspad);
-}
-
-/**
- * @brief Deasserts the slave select signal.
- * @details The previously selected peripheral is unselected.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- *
- * @notapi
- */
-void spi_lld_unselect(SPIDriver *spip) {
-
- palSetPad(spip->config->ssport, spip->config->sspad);
-}
-
-/**
- * @brief Ignores data on the SPI bus.
- * @details This asynchronous function starts the transmission of a series of
- * idle words on the SPI bus and ignores the received data.
- * @post At the end of the operation the configured callback is invoked.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- * @param[in] n number of words to be ignored
- *
- * @notapi
- */
-void spi_lld_ignore(SPIDriver *spip, size_t n) {
-
- spip->count = n;
- spip->rxbuf = NULL;
- spip->txbuf = NULL;
-
- spi_start_xfer(spip, false);
-}
-
-/**
- * @brief Exchanges data on the SPI bus.
- * @details This asynchronous function starts a simultaneous transmit/receive
- * operation.
- * @post At the end of the operation the configured callback is invoked.
- * @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.
- *
- * @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
- *
- * @notapi
- */
-void spi_lld_exchange(SPIDriver *spip, size_t n,
- const void *txbuf, void *rxbuf) {
-
- spip->count = n;
- spip->rxbuf = rxbuf;
- spip->txbuf = txbuf;
-
- spi_start_xfer(spip, false);
-}
-
-/**
- * @brief Sends data over the SPI bus.
- * @details This asynchronous function starts a transmit operation.
- * @post At the end of the operation the configured callback is invoked.
- * @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.
- *
- * @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
- *
- * @notapi
- */
-void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {
-
- spip->count = n;
- spip->rxbuf = NULL;
- spip->txbuf = (void *)txbuf;
-
- spi_start_xfer(spip, false);
-}
-
-/**
- * @brief Receives data from the SPI bus.
- * @details This asynchronous function starts a receive operation.
- * @post At the end of the operation the configured callback is invoked.
- * @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.
- *
- * @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
- *
- * @notapi
- */
-void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
-
- spip->count = n;
- spip->rxbuf = rxbuf;
- spip->txbuf = NULL;
-
- spi_start_xfer(spip, false);
-}
-
-/**
- * @brief Exchanges one frame using a polled wait.
- * @details This synchronous function exchanges one frame using a polled
- * synchronization method. This function is useful when exchanging
- * small amount of data on high speed channels, usually in this
- * situation is much more efficient just wait for completion using
- * polling than suspending the thread waiting for an interrupt.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- * @param[in] frame the data frame to send over the SPI bus
- * @return The received data frame from the SPI bus.
- */
-uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
-
- spi_start_xfer(spip, true);
-
- spip->spi->PUSHR = SPIx_PUSHR_TXDATA(frame);
-
- while ((spip->spi->SR & SPIx_SR_RFDF) == 0)
- ;
-
- frame = spip->spi->POPR;
-
- spi_stop_xfer(spip);
-
- return frame;
-}
-
-#endif /* HAL_USE_SPI */
-
-/** @} */
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