diff options
Diffstat (limited to 'os/hal/platforms/AVR/spi_lld.c')
| -rw-r--r-- | os/hal/platforms/AVR/spi_lld.c | 430 |
1 files changed, 0 insertions, 430 deletions
diff --git a/os/hal/platforms/AVR/spi_lld.c b/os/hal/platforms/AVR/spi_lld.c deleted file mode 100644 index 4651e7d74..000000000 --- a/os/hal/platforms/AVR/spi_lld.c +++ /dev/null @@ -1,430 +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 AVR/spi_lld.c
- * @brief AVR SPI subsystem low level driver source.
- *
- * @addtogroup SPI
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_SPI || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-/**
- * @brief SPI1 driver identifier.
- */
-#if AVR_SPI_USE_SPI1 || defined(__DOXYGEN__)
-SPIDriver SPID1;
-#endif
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if AVR_SPI_USE_SPI1 || defined(__DOXYGEN__)
-/**
- * @brief SPI event interrupt handler.
- *
- * @notapi
- */
-CH_IRQ_HANDLER(SPI_STC_vect) {
- CH_IRQ_PROLOGUE();
-
- SPIDriver *spip = &SPID1;
-
- /* spi_lld_exchange or spi_lld_receive */
- if (spip->rxbuf && spip->rxidx < spip->rxbytes) {
- spip->rxbuf[spip->rxidx++] = SPDR; // receive
- }
-
- /* spi_lld_exchange, spi_lld_send or spi_lld_ignore */
- if (spip->txidx < spip->txbytes) {
- if (spip->txbuf) {
- SPDR = spip->txbuf[spip->txidx++]; // send
- } else {
- SPDR = 0; spip->txidx++; // dummy send
- }
- }
-
- /* spi_lld_send */
- else if (spip->rxidx < spip->rxbytes) { /* rx not done */
- SPDR = 0; // dummy send to keep the clock going
- }
-
- /* rx done and tx done */
- if (spip->rxidx >= spip->rxbytes && spip->txidx >= spip->txbytes) {
- _spi_isr_code(spip);
- }
-
- CH_IRQ_EPILOGUE();
-}
-#endif /* AVR_SPI_USE_SPI1 */
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level SPI driver initialization.
- *
- * @notapi
- */
-void spi_lld_init(void) {
-
-#if AVR_SPI_USE_SPI1
- /* Driver initialization.*/
- spiObjectInit(&SPID1);
-#endif /* AVR_SPI_USE_SPI1 */
-}
-
-/**
- * @brief Configures and activates the SPI peripheral.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- *
- * @notapi
- */
-void spi_lld_start(SPIDriver *spip) {
-
- uint8_t dummy;
-
- /* Configures the peripheral.*/
-
- if (spip->state == SPI_STOP) {
- /* Enables the peripheral.*/
-#if AVR_SPI_USE_SPI1
- if (&SPID1 == spip) {
- /* Enable SPI clock using Power Reduction Register */
-#if defined(PRR0)
- PRR0 &= ~(1 << PRSPI);
-#elif defined(PRR)
- PRR &= ~(1 << PRSPI);
-#endif
-
- /* SPI enable, SPI interrupt enable */
- SPCR |= ((1 << SPE) | (1 << SPIE));
-
- switch (spip->config->role) {
- case SPI_ROLE_SLAVE:
- SPCR &= ~(1 << MSTR); /* master mode */
- DDR_SPI1 |= (1 << SPI1_MISO); /* output */
- DDR_SPI1 &= ~((1 << SPI1_MOSI) | (1 << SPI1_SCK) | (1 << SPI1_SS)); /* input */
- break;
- case SPI_ROLE_MASTER: /* fallthrough */
- default:
- SPCR |= (1 << MSTR); /* slave mode */
- DDR_SPI1 |= ((1 << SPI1_MOSI) | (1 << SPI1_SCK)); /* output */
- DDR_SPI1 &= ~(1 << SPI1_MISO); /* input */
- spip->config->ssport->dir |= (1 << spip->config->sspad);
- }
-
- switch (spip->config->bitorder) {
- case SPI_LSB_FIRST:
- SPCR |= (1 << DORD);
- break;
- case SPI_MSB_FIRST: /* fallthrough */
- default:
- SPCR &= ~(1 << DORD);
- break;
- }
-
- SPCR &= ~((1 << CPOL) | (1 << CPHA));
- switch (spip->config->mode) {
- case SPI_MODE_1:
- SPCR |= (1 << CPHA);
- break;
- case SPI_MODE_2:
- SPCR |= (1 << CPOL);
- break;
- case SPI_MODE_3:
- SPCR |= ((1 << CPOL) | (1 << CPHA));
- break;
- case SPI_MODE_0: /* fallthrough */
- default: break;
- }
-
- SPCR &= ~((1 << SPR1) | (1 << SPR0));
- SPSR &= ~(1 << SPI2X);
- switch (spip->config->clockrate) {
- case SPI_SCK_FOSC_2:
- SPSR |= (1 << SPI2X);
- break;
- case SPI_SCK_FOSC_8:
- SPSR |= (1 << SPI2X);
- SPCR |= (1 << SPR0);
- break;
- case SPI_SCK_FOSC_16:
- SPCR |= (1 << SPR0);
- break;
- case SPI_SCK_FOSC_32:
- SPSR |= (1 << SPI2X);
- SPCR |= (1 << SPR1);
- break;
- case SPI_SCK_FOSC_64:
- SPCR |= (1 << SPR1);
- break;
- case SPI_SCK_FOSC_128:
- SPCR |= ((1 << SPR1) | (1 << SPR0));
- break;
- case SPI_SCK_FOSC_4: /* fallthrough */
- default: break;
- }
-
- /* dummy reads before enabling interrupt */
- dummy = SPSR;
- dummy = SPDR;
- (void) dummy; /* suppress warning about unused variable */
- SPCR |= (1 << SPIE);
- }
-#endif /* AVR_SPI_USE_SPI1 */
- }
-}
-
-/**
- * @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_READY) {
- /* Resets the peripheral.*/
-
- /* Disables the peripheral.*/
-#if AVR_SPI_USE_SPI1
- if (&SPID1 == spip) {
- SPCR &= ((1 << SPIE) | (1 << SPE));
- spip->config->ssport->dir &= ~(1 << spip->config->sspad);
- }
-/* Disable SPI clock using Power Reduction Register */
-#if defined(PRR0)
- PRR0 |= (1 << PRSPI);
-#elif defined(PRR)
- PRR |= (1 << PRSPI);
-#endif
-#endif /* AVR_SPI_USE_SPI1 */
- }
-}
-
-/**
- * @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) {
-
- /**
- * NOTE: This should only be called in master mode
- */
- spip->config->ssport->out &= ~(1 << 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) {
-
- /**
- * NOTE: This should only be called in master mode
- */
- spip->config->ssport->out |= (1 << 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->rxbuf = spip->txbuf = NULL;
- spip->txbytes = n;
- spip->txidx = 0;
-
- SPDR = 0;
-}
-
-/**
- * @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->rxbuf = rxbuf;
- spip->txbuf = txbuf;
- spip->txbytes = spip->rxbytes = n;
- spip->txidx = spip->rxidx = 0;
-
- SPDR = spip->txbuf[spip->txidx++];
-}
-
-/**
- * @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->rxbuf = NULL;
- spip->txbuf = txbuf;
- spip->txbytes = n;
- spip->txidx = 0;
-
- SPDR = spip->txbuf[spip->txidx++];
-}
-
-/**
- * @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->txbuf = NULL;
- spip->rxbuf = rxbuf;
- spip->rxbytes = n;
- spip->rxidx = 0;
-
- /* Write dummy byte to start communication */
- SPDR = 0;
-}
-
-/**
- * @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.
- */
-#if AVR_SPI_USE_16BIT_POLLED_EXCHANGE
-uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
-
- uint16_t spdr = 0;
- uint8_t dummy;
-
- /* disable interrupt */
- SPCR &= ~(1 << SPIE);
-
- SPDR = frame >> 8;
- while (!(SPSR & (1 << SPIF))) ;
- spdr = SPDR << 8;
-
- SPDR = frame & 0xFF;
- while (!(SPSR & (1 << SPIF))) ;
- spdr |= SPDR;
-
- dummy = SPSR;
- dummy = SPDR;
- (void) dummy; /* suppress warning about unused variable */
- SPCR |= (1 << SPIE);
-
- return spdr;
-}
-#else /* AVR_SPI_USE_16BIT_POLLED_EXCHANGE */
-uint8_t spi_lld_polled_exchange(SPIDriver *spip, uint8_t frame) {
-
- uint8_t spdr = 0;
- uint8_t dummy;
-
- /* disable interrupt */
- SPCR &= ~(1 << SPIE);
-
- SPDR = frame;
- while (!(SPSR & (1 << SPIF))) ;
- spdr = SPDR;
-
- dummy = SPSR;
- dummy = SPDR;
- (void) dummy; /* suppress warning about unused variable */
- SPCR |= (1 << SPIE);
-
- return spdr;
-}
-#endif /* AVR_SPI_USE_16BIT_POLLED_EXCHANGE */
-
-#endif /* HAL_USE_SPI */
-
-/** @} */
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