diff options
Diffstat (limited to 'os/hal/platforms/LPC8xx/spi_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC8xx/spi_lld.c | 385 |
1 files changed, 0 insertions, 385 deletions
diff --git a/os/hal/platforms/LPC8xx/spi_lld.c b/os/hal/platforms/LPC8xx/spi_lld.c deleted file mode 100644 index d5a8a4047..000000000 --- a/os/hal/platforms/LPC8xx/spi_lld.c +++ /dev/null @@ -1,385 +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 LPC8xx/spi_lld.c
- * @brief LPC8xx low level SPI driver code.
- *
- * @addtogroup SPI
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_SPI || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-#if LPC8xx_SPI_USE_SPI0 || defined(__DOXYGEN__)
-/** @brief SPI1 driver identifier.*/
-SPIDriver SPID1;
-#endif
-
-#if LPC8xx_SPI_USE_SPI1 || defined(__DOXYGEN__)
-/** @brief SPI2 driver identifier.*/
-SPIDriver SPID2;
-#endif
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-static void spi_load_txdata(SPIDriver *spip) {
-
- LPC_SPI_TypeDef *spi = spip->spi;
-
- if (--spip->txcnt == 0) {
- spi->TXCTRL |= SPI_TXCTRL_EOT;
- }
-
- if (spip->txptr != NULL) {
- if ((spi->TXCTRL & SPI_TXCTRL_FLEN_MASK) > SPI_TXCTRL_FLEN(8)) {
- const uint16_t *p = spip->txptr;
- spi->TXDAT = *p++;
- spip->txptr = p;
- }
- else {
- const uint8_t *p = spip->txptr;
- spi->TXDAT = *p++;
- spip->txptr = p;
- }
- }
- else
- spi->TXDAT = 0xffff;
-}
-
-/**
- * @brief Common IRQ handler.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- */
-static void spi_serve_interrupt(SPIDriver *spip) {
-
- LPC_SPI_TypeDef *spi = spip->spi;
-
- if (spi->INTSTAT & (SPI_STAT_RXOV | SPI_STAT_TXUR)) {
- /* The overflow condition should never happen becausepriority is given
- to receive but a hook macro is provided anyway...*/
- LPC8xx_SPI_ERROR_HOOK(spip);
- spi->STAT = (SPI_STAT_RXOV | SPI_STAT_TXUR);
- }
-
- if (spi->INTSTAT & SPI_STAT_TXRDY) {
- spi_load_txdata( spip );
- }
-
- if (spip->txcnt == 0) {
- spi->INTENCLR = (SPI_STAT_TXRDY | SPI_STAT_TXUR);
- }
-
- if (spi->INTSTAT & SPI_STAT_RXRDY) {
- if (spip->rxptr != NULL) {
- if ((spi->TXCTRL & SPI_TXCTRL_FLEN_MASK) > SPI_TXCTRL_FLEN(8)) {
- uint16_t *p = spip->rxptr;
- *p++ = spi->RXDAT;
- spip->rxptr = p;
- }
- else {
- uint8_t *p = spip->rxptr;
- *p++ = spi->RXDAT;
- spip->rxptr = p;
- }
- }
- else
- (void)spi->RXDAT;
-
- if (--spip->rxcnt == 0) {
- chDbgAssert(spip->txcnt == 0,
- "spi_serve_interrupt(), #1", "counter out of synch");
- /* Stops the IRQ sources.*/
- spi->INTENCLR = (SPI_STAT_RXRDY | SPI_STAT_TXRDY |
- SPI_STAT_RXOV | SPI_STAT_TXUR);
-
- /* Portable SPI ISR code defined in the high level driver, note, it is
- a macro.*/
- _spi_isr_code(spip);
- return;
- }
- }
-
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if LPC8xx_SPI_USE_SPI0 || defined(__DOXYGEN__)
-/**
- * @brief SPI0 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(Vector40) {
-
- CH_IRQ_PROLOGUE();
- spi_serve_interrupt(&SPID1);
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-#if LPC8xx_SPI_USE_SPI1 || defined(__DOXYGEN__)
-/**
- * @brief SPI1 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(Vector44) {
-
- CH_IRQ_PROLOGUE();
- spi_serve_interrupt(&SPID2);
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level SPI driver initialization.
- *
- * @notapi
- */
-void spi_lld_init(void) {
-
-#if LPC8xx_SPI_USE_SPI0
- spiObjectInit(&SPID1);
- SPID1.spi = LPC_SPI0;
-#endif
-
-#if LPC8xx_SPI_USE_SPI1
- spiObjectInit(&SPID2);
- SPID2.spi = LPC_SPI1;
-#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 LPC8xx_SPI_USE_SPI0
- if (&SPID1 == spip) {
- LPC_SYSCON->SYSAHBCLKCTRL |= (1<<11);
- LPC_SYSCON->PRESETCTRL |= (1<<0);
- spip->spi->DIV = LPC8xx_SPI_SPI0CLKDIV;
- nvicEnableVector(SPI0_IRQn,
- CORTEX_PRIORITY_MASK(LPC8xx_SPI_SPI0_IRQ_PRIORITY));
- }
-#endif
-#if LPC8xx_SPI_USE_SPI1
- if (&SPID2 == spip) {
- LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);
- LPC_SYSCON->PRESETCTRL |= (1<<1);
- spip->spi->DIV = LPC8xx_SPI_SPI1CLKDIV;
- nvicEnableVector(SPI1_IRQn,
- CORTEX_PRIORITY_MASK(LPC8xx_SPI_SPI1_IRQ_PRIORITY));
- }
-#endif
- }
-
- spip->spi->DLY = spip->config->dly;
- spip->spi->TXCTRL = spip->config->txctrl;
- spip->spi->STAT = (SPI_STAT_RXOV | SPI_STAT_TXUR);
- spip->spi->CFG = spip->config->cfg | SPI_CFG_ENABLE;
-}
-
-/**
- * @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) {
- spip->spi->CFG = 0;
-
-#if LPC8xx_SPI_USE_SPI0
- if (&SPID1 == spip) {
- nvicDisableVector(SPI0_IRQn);
- LPC_SYSCON->PRESETCTRL &= ~(1<<0);
- LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<11);
- }
-#endif
-
-#if LPC8xx_SPI_USE_SPI1
- if (&SPID2 == spip) {
- nvicDisableVector(SPI1_IRQn);
- LPC_SYSCON->PRESETCTRL &= ~(1<<1);
- LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<12);
- }
-#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) {
- /* Hardware controls SSEL */
- (void)spip;
-}
-
-/**
- * @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) {
- /* Hardware controls SSEL */
- (void)spip;
-}
-
-/**
- * @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->rxptr = rxbuf;
- spip->txptr = txbuf;
- spip->rxcnt = spip->txcnt = n;
- spip->spi->TXCTRL &= ~SPI_TXCTRL_EOT;
- spi_load_txdata(spip);
-
- if (spip->txcnt == 0)
- spip->spi->INTENSET = (SPI_STAT_RXRDY | SPI_STAT_RXOV);
- else
- spip->spi->INTENSET = (SPI_STAT_RXRDY | SPI_STAT_TXRDY |
- SPI_STAT_RXOV | SPI_STAT_TXUR);
-
-}
-
-/**
- * @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) {
-
- spi_lld_exchange( spip, n, NULL, NULL);
-}
-
-/**
- * @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) {
-
- spi_lld_exchange( spip, n, txbuf, NULL);
-}
-
-/**
- * @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) {
-
- spi_lld_exchange( spip, n, NULL, rxbuf);
-}
-
-/**
- * @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->TXCTRL |= SPI_TXCTRL_EOT;
- spip->spi->TXDAT = frame;
- while ((spip->spi->STAT & SPI_STAT_RXRDY) == 0)
- ;
- return (uint16_t)spip->spi->RXDAT;
-}
-
-#endif /* HAL_USE_SPI */
-
-/** @} */
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