diff options
Diffstat (limited to 'os/hal/platforms/AT91SAM7/spi_lld.c')
| -rw-r--r-- | os/hal/platforms/AT91SAM7/spi_lld.c | 397 |
1 files changed, 0 insertions, 397 deletions
diff --git a/os/hal/platforms/AT91SAM7/spi_lld.c b/os/hal/platforms/AT91SAM7/spi_lld.c deleted file mode 100644 index a2ffcfd2e..000000000 --- a/os/hal/platforms/AT91SAM7/spi_lld.c +++ /dev/null @@ -1,397 +0,0 @@ -/*
- ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
-
- 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 AT91SAM7/spi_lld.c
- * @brief AT91SAM7 low level SPI driver code.
- *
- * @addtogroup SPI
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_SPI || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-#if AT91SAM7_SPI_USE_SPI0 || defined(__DOXYGEN__)
-/** @brief SPI1 driver identifier.*/
-SPIDriver SPID1;
-#endif
-
-#if AT91SAM7_SPI_USE_SPI1 || defined(__DOXYGEN__)
-/** @brief SPI2 driver identifier.*/
-SPIDriver SPID2;
-#endif
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-/**
- * @brief Idle line value.
- * @details This thing's DMA apparently does not allow to *not* increment
- * the memory pointer so a buffer filled with ones is required
- * somewhere.
- * @note This buffer size also limits the maximum transfer size, 512B,
- * for @p spiReceive() and @p spiIgnore(). @p spiSend() and
- * @p spiExchange are not affected.
- */
-static const uint16_t idle_buf[] = {
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
- 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF
-};
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/**
- * @brief Initializes a SPI device.
- */
-static void spi_init(AT91PS_SPI spi) {
-
- /* Software reset must be written twice (errata for revision B parts).*/
- spi->SPI_CR = AT91C_SPI_SWRST;
- spi->SPI_CR = AT91C_SPI_SWRST;
- spi->SPI_RCR = 0;
- spi->SPI_RNCR = 0;
- spi->SPI_TCR = 0;
- spi->SPI_TNCR = 0;
- spi->SPI_PTCR = AT91C_PDC_RXTDIS | AT91C_PDC_TXTDIS;
- spi->SPI_MR = AT91C_SPI_MSTR | AT91C_SPI_MODFDIS;
-}
-
-#if defined(__GNUC__)
-__attribute__((noinline))
-#endif
-/**
- * @brief Shared interrupt handling code.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- */
-static void spi_lld_serve_interrupt(SPIDriver *spip) {
- uint32_t sr = spip->spi->SPI_SR;
-
- if ((sr & AT91C_SPI_ENDRX) != 0) {
- (void)spip->spi->SPI_RDR; /* Clears eventual overflow.*/
- spip->spi->SPI_PTCR = AT91C_PDC_RXTDIS |
- AT91C_PDC_TXTDIS; /* PDC disabled. */
- spip->spi->SPI_IDR = AT91C_SPI_ENDRX; /* Interrupt disabled. */
- spip->spi->SPI_CR = AT91C_SPI_SPIDIS; /* SPI disabled. */
- /* Portable SPI ISR code defined in the high level driver, note, it is
- a macro.*/
- _spi_isr_code(spip);
- }
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if AT91SAM7_SPI_USE_SPI0 || defined(__DOXYGEN__)
-/**
- * @brief SPI0 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(SPI0IrqHandler) {
-
- CH_IRQ_PROLOGUE();
- spi_lld_serve_interrupt(&SPID1);
- AT91C_BASE_AIC->AIC_EOICR = 0;
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-#if AT91SAM7_SPI_USE_SPI1 || defined(__DOXYGEN__)
-/**
- * @brief SPI1 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(SPI1IrqHandler) {
-
- CH_IRQ_PROLOGUE();
- spi_lld_serve_interrupt(&SPID2);
- AT91C_BASE_AIC->AIC_EOICR = 0;
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level SPI driver initialization.
- *
- * @notapi
- */
-void spi_lld_init(void) {
-
-#if AT91SAM7_SPI_USE_SPI0
- spiObjectInit(&SPID1);
- SPID1.spi = AT91C_BASE_SPI0;
- spi_init(AT91C_BASE_SPI0);
- AT91C_BASE_PIOA->PIO_PDR = SPI0_MISO | SPI0_MOSI | SPI0_SCK;
- AT91C_BASE_PIOA->PIO_ASR = SPI0_MISO | SPI0_MOSI | SPI0_SCK;
- AT91C_BASE_PIOA->PIO_PPUDR = SPI0_MISO | SPI0_MOSI | SPI0_SCK;
- AIC_ConfigureIT(AT91C_ID_SPI0,
- AT91C_AIC_SRCTYPE_HIGH_LEVEL | AT91SAM7_SPI0_PRIORITY,
- SPI0IrqHandler);
-#endif
-
-#if AT91SAM7_SPI_USE_SPI1
- spiObjectInit(&SPID2);
- SPID2.spi = AT91C_BASE_SPI1;
- spi_init(AT91C_BASE_SPI1);
- AT91C_BASE_PIOA->PIO_PDR = SPI1_MISO | SPI1_MOSI | SPI1_SCK;
- AT91C_BASE_PIOA->PIO_BSR = SPI1_MISO | SPI1_MOSI | SPI1_SCK;
- AT91C_BASE_PIOA->PIO_PPUDR = SPI1_MISO | SPI1_MOSI | SPI1_SCK;
- AIC_ConfigureIT(AT91C_ID_SPI1,
- AT91C_AIC_SRCTYPE_HIGH_LEVEL | AT91SAM7_SPI1_PRIORITY,
- SPI1IrqHandler);
-#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 (spip->state == SPI_STOP) {
-#if AT91SAM7_SPI_USE_SPI0
- if (&SPID1 == spip) {
- /* Clock activation.*/
- AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_SPI0);
- /* Enables associated interrupt vector.*/
- AIC_EnableIT(AT91C_ID_SPI0);
- }
-#endif
-#if AT91SAM7_SPI_USE_SPI1
- if (&SPID2 == spip) {
- /* Clock activation.*/
- AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_SPI1);
- /* Enables associated interrupt vector.*/
- AIC_EnableIT(AT91C_ID_SPI1);
- }
-#endif
- }
- /* Configuration.*/
- spip->spi->SPI_CSR[0] = spip->config->csr;
-}
-
-/**
- * @brief Deactivates the SPI peripheral.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- *
- * @notapi
- */
-void spi_lld_stop(SPIDriver *spip) {
-
- if (spip->state != SPI_STOP) {
-#if AT91SAM7_SPI_USE_SPI0
- if (&SPID1 == spip) {
- AT91C_BASE_PMC->PMC_PCDR = (1 << AT91C_ID_SPI0);
- AIC_DisableIT(AT91C_ID_SPI0);
- }
-#endif
-#if AT91SAM7_SPI_USE_SPI1
- if (&SPID1 == spip) {
- AT91C_BASE_PMC->PMC_PCDR = (1 << AT91C_ID_SPI1);
- AIC_DisableIT(AT91C_ID_SPI0);
- }
-#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 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
- *
- * @notapi
- */
-void spi_lld_ignore(SPIDriver *spip, size_t n) {
-
- spip->spi->SPI_TCR = n;
- spip->spi->SPI_RCR = n;
- spip->spi->SPI_TPR = (AT91_REG)idle_buf;
- spip->spi->SPI_RPR = (AT91_REG)idle_buf;
- spip->spi->SPI_IER = AT91C_SPI_ENDRX;
- spip->spi->SPI_CR = AT91C_SPI_SPIEN;
- spip->spi->SPI_PTCR = AT91C_PDC_RXTEN | AT91C_PDC_TXTEN;
-}
-
-/**
- * @brief Exchanges data on the SPI bus.
- * @details This function performs a simultaneous transmit/receive operation.
- * @note The buffers are organized as uint8_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->spi->SPI_TCR = n;
- spip->spi->SPI_RCR = n;
- spip->spi->SPI_TPR = (AT91_REG)txbuf;
- spip->spi->SPI_RPR = (AT91_REG)rxbuf;
- spip->spi->SPI_IER = AT91C_SPI_ENDRX;
- spip->spi->SPI_CR = AT91C_SPI_SPIEN;
- spip->spi->SPI_PTCR = AT91C_PDC_RXTEN | AT91C_PDC_TXTEN;
-}
-
-/**
- * @brief Sends data over the SPI bus.
- * @note The buffers are organized as uint8_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->spi->SPI_TCR = n;
- spip->spi->SPI_RCR = n;
- spip->spi->SPI_TPR = (AT91_REG)txbuf;
- spip->spi->SPI_RPR = (AT91_REG)idle_buf;
- spip->spi->SPI_IER = AT91C_SPI_ENDRX;
- spip->spi->SPI_CR = AT91C_SPI_SPIEN;
- spip->spi->SPI_PTCR = AT91C_PDC_RXTEN | AT91C_PDC_TXTEN;
-}
-
-/**
- * @brief Receives data from the SPI bus.
- * @note The buffers are organized as uint8_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->spi->SPI_TCR = n;
- spip->spi->SPI_RCR = n;
- spip->spi->SPI_TPR = (AT91_REG)idle_buf;
- spip->spi->SPI_RPR = (AT91_REG)rxbuf;
- spip->spi->SPI_IER = AT91C_SPI_ENDRX;
- spip->spi->SPI_CR = AT91C_SPI_SPIEN;
- spip->spi->SPI_PTCR = AT91C_PDC_RXTEN | AT91C_PDC_TXTEN;
-}
-
-/**
- * @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) {
-
- spip->spi->SPI_CR = AT91C_SPI_SPIEN;
- spip->spi->SPI_TDR = frame;
- while ((spip->spi->SPI_SR & AT91C_SPI_RDRF) == 0)
- ;
- return spip->spi->SPI_RDR;
-}
-
-#endif /* HAL_USE_SPI */
-
-/** @} */
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