diff options
Diffstat (limited to 'os/hal/platforms/LPC13xx/spi_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC13xx/spi_lld.c | 404 |
1 files changed, 0 insertions, 404 deletions
diff --git a/os/hal/platforms/LPC13xx/spi_lld.c b/os/hal/platforms/LPC13xx/spi_lld.c deleted file mode 100644 index 3b8ad65b6..000000000 --- a/os/hal/platforms/LPC13xx/spi_lld.c +++ /dev/null @@ -1,404 +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 LPC13xx/spi_lld.c
- * @brief LPC13xx low level SPI driver code.
- *
- * @addtogroup SPI
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_SPI || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-#if LPC13xx_SPI_USE_SSP0 || defined(__DOXYGEN__)
-/** @brief SPI1 driver identifier.*/
-SPIDriver SPID1;
-#endif
-
-#if LPC13xx_SPI_USE_SSP1 || defined(__DOXYGEN__)
-/** @brief SPI2 driver identifier.*/
-SPIDriver SPID2;
-#endif
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/**
- * @brief Preloads the transmit FIFO.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- */
-static void ssp_fifo_preload(SPIDriver *spip) {
- LPC_SSP_TypeDef *ssp = spip->ssp;
- uint32_t n = spip->txcnt > LPC13xx_SSP_FIFO_DEPTH ?
- LPC13xx_SSP_FIFO_DEPTH : spip->txcnt;
-
- while(((ssp->SR & SR_TNF) != 0) && (n > 0)) {
- if (spip->txptr != NULL) {
- if ((ssp->CR0 & CR0_DSSMASK) > CR0_DSS8BIT) {
- const uint16_t *p = spip->txptr;
- ssp->DR = *p++;
- spip->txptr = p;
- }
- else {
- const uint8_t *p = spip->txptr;
- ssp->DR = *p++;
- spip->txptr = p;
- }
- }
- else
- ssp->DR = 0xFFFFFFFF;
- n--;
- spip->txcnt--;
- }
-}
-
-/**
- * @brief Common IRQ handler.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- */
-static void spi_serve_interrupt(SPIDriver *spip) {
- LPC_SSP_TypeDef *ssp = spip->ssp;
-
- if ((ssp->MIS & MIS_ROR) != 0) {
- /* The overflow condition should never happen because priority is given
- to receive but a hook macro is provided anyway...*/
- LPC13xx_SPI_SSP_ERROR_HOOK(spip);
- }
- ssp->ICR = ICR_RT | ICR_ROR;
- while ((ssp->SR & SR_RNE) != 0) {
- if (spip->rxptr != NULL) {
- if ((ssp->CR0 & CR0_DSSMASK) > CR0_DSS8BIT) {
- uint16_t *p = spip->rxptr;
- *p++ = ssp->DR;
- spip->rxptr = p;
- }
- else {
- uint8_t *p = spip->rxptr;
- *p++ = ssp->DR;
- spip->rxptr = p;
- }
- }
- else
- (void)ssp->DR;
- if (--spip->rxcnt == 0) {
- chDbgAssert(spip->txcnt == 0,
- "spi_serve_interrupt(), #1", "counter out of synch");
- /* Stops the IRQ sources.*/
- ssp->IMSC = 0;
- /* Portable SPI ISR code defined in the high level driver, note, it is
- a macro.*/
- _spi_isr_code(spip);
- return;
- }
- }
- ssp_fifo_preload(spip);
- if (spip->txcnt == 0)
- ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_RX;
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if LPC13xx_SPI_USE_SSP0 || defined(__DOXYGEN__)
-/**
- * @brief SSP0 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(VectorF4) {
-
- CH_IRQ_PROLOGUE();
-
- spi_serve_interrupt(&SPID1);
-
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-#if LPC13xx_SPI_USE_SSP1 || defined(__DOXYGEN__)
-/**
- * @brief SSP1 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(Vector124) {
-
- 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 LPC13xx_SPI_USE_SSP0
- spiObjectInit(&SPID1);
- SPID1.ssp = LPC_SSP0;
- LPC_IOCON->SCK_LOC = LPC13xx_SPI_SCK0_SELECTOR;
-#if LPC13xx_SPI_SCK0_SELECTOR == SCK0_IS_PIO0_10
- LPC_IOCON->SWCLK_PIO0_10 = 0xC2; /* SCK0 without resistors. */
-#elif LPC13xx_SPI_SCK0_SELECTOR == SCK0_IS_PIO2_11
- LPC_IOCON->PIO2_11 = 0xC1; /* SCK0 without resistors. */
-#else /* LPC13xx_SPI_SCK0_SELECTOR == SCK0_IS_PIO0_6 */
- LPC_IOCON->PIO0_6 = 0xC2; /* SCK0 without resistors. */
-#endif
- LPC_IOCON->PIO0_8 = 0xC1; /* MISO0 without resistors. */
- LPC_IOCON->PIO0_9 = 0xC1; /* MOSI0 without resistors. */
-#endif /* LPC13xx_SPI_USE_SSP0 */
-
-#if LPC13xx_SPI_USE_SSP1
- spiObjectInit(&SPID2);
- SPID2.ssp = LPC_SSP1;
- LPC_IOCON->PIO2_1 = 0xC2; /* SCK1 without resistors. */
- LPC_IOCON->PIO2_2 = 0xC2; /* MISO1 without resistors. */
- LPC_IOCON->PIO2_3 = 0xC2; /* MOSI1 without resistors. */
-#endif /* LPC13xx_SPI_USE_SSP0 */
-}
-
-/**
- * @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) {
- /* Clock activation.*/
-#if LPC13xx_SPI_USE_SSP0
- if (&SPID1 == spip) {
- LPC_SYSCON->SSP0CLKDIV = LPC13xx_SPI_SSP0CLKDIV;
- LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 11);
- LPC_SYSCON->PRESETCTRL |= 1;
- nvicEnableVector(SSP0_IRQn,
- CORTEX_PRIORITY_MASK(LPC13xx_SPI_SSP0_IRQ_PRIORITY));
- }
-#endif
-#if LPC13xx_SPI_USE_SSP1
- if (&SPID2 == spip) {
- LPC_SYSCON->SSP1CLKDIV = LPC13xx_SPI_SSP1CLKDIV;
- LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 18);
- LPC_SYSCON->PRESETCTRL |= 4;
- nvicEnableVector(SSP1_IRQn,
- CORTEX_PRIORITY_MASK(LPC13xx_SPI_SSP1_IRQ_PRIORITY));
- }
-#endif
- }
- /* Configuration.*/
- spip->ssp->CR1 = 0;
- spip->ssp->ICR = ICR_RT | ICR_ROR;
- spip->ssp->CR0 = spip->config->cr0;
- spip->ssp->CPSR = spip->config->cpsr;
- spip->ssp->CR1 = CR1_SSE;
-}
-
-/**
- * @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->ssp->CR1 = 0;
- spip->ssp->CR0 = 0;
- spip->ssp->CPSR = 0;
-#if LPC13xx_SPI_USE_SSP0
- if (&SPID1 == spip) {
- LPC_SYSCON->PRESETCTRL &= ~1;
- LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 11);
- LPC_SYSCON->SSP0CLKDIV = 0;
- nvicDisableVector(SSP0_IRQn);
- }
-#endif
-#if LPC13xx_SPI_USE_SSP1
- if (&SPID2 == spip) {
- LPC_SYSCON->PRESETCTRL &= ~4;
- LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 18);
- LPC_SYSCON->SSP1CLKDIV = 0;
- nvicDisableVector(SSP1_IRQn);
- }
-#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->rxptr = NULL;
- spip->txptr = NULL;
- spip->rxcnt = spip->txcnt = n;
- ssp_fifo_preload(spip);
- spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
-}
-
-/**
- * @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;
- ssp_fifo_preload(spip);
- spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
-}
-
-/**
- * @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->rxptr = NULL;
- spip->txptr = txbuf;
- spip->rxcnt = spip->txcnt = n;
- ssp_fifo_preload(spip);
- spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
-}
-
-/**
- * @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->rxptr = rxbuf;
- spip->txptr = NULL;
- spip->rxcnt = spip->txcnt = n;
- ssp_fifo_preload(spip);
- spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
-}
-
-/**
- * @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->ssp->DR = (uint32_t)frame;
- while ((spip->ssp->SR & SR_RNE) == 0)
- ;
- return (uint16_t)spip->ssp->DR;
-}
-
-#endif /* HAL_USE_SPI */
-
-/** @} */
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