diff options
Diffstat (limited to 'os/hal/ports/NRF5/NRF51822/hal_spi_lld.c')
| -rw-r--r-- | os/hal/ports/NRF5/NRF51822/hal_spi_lld.c | 374 |
1 files changed, 0 insertions, 374 deletions
diff --git a/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c b/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c deleted file mode 100644 index 83b231f..0000000 --- a/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c +++ /dev/null @@ -1,374 +0,0 @@ -/*
- Copyright (C) 2015 Stephen Caudle
-
- 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 NRF51822/spi_lld.c
- * @brief NRF51822 low level SPI driver code.
- *
- * @addtogroup SPI
- * @{
- */
-
-#include "hal.h"
-
-#if HAL_USE_SPI || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-#if NRF5_SPI_USE_SPI0 || defined(__DOXYGEN__)
-/** @brief SPI1 driver identifier.*/
-SPIDriver SPID1;
-#endif
-
-#if NRF5_SPI_USE_SPI1 || 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 port_fifo_preload(SPIDriver *spip) {
- NRF_SPI_Type *port = spip->port;
-
- if (spip->txcnt > 0 && spip->txptr != NULL)
- port->TXD = *(uint8_t *)spip->txptr++;
- else
- port->TXD = 0xFF;
- spip->txcnt--;
-}
-
-#if defined(__GNUC__)
-__attribute__((noinline))
-#endif
-/**
- * @brief Common IRQ handler.
- *
- * @param[in] spip pointer to the @p SPIDriver object
- */
-static void serve_interrupt(SPIDriver *spip) {
- NRF_SPI_Type *port = spip->port;
-
- // Clear SPI READY event flag
- port->EVENTS_READY = 0;
-
- if (spip->rxptr != NULL) {
- *(uint8_t *)spip->rxptr++ = port->RXD;
- }
- else {
- (void)port->RXD;
- if (--spip->rxcnt == 0) {
- osalDbgAssert(spip->txcnt == 0, "counter out of synch");
- /* Stops the IRQ sources.*/
- spip->port->INTENCLR = (SPI_INTENCLR_READY_Clear << SPI_INTENCLR_READY_Pos);
- /* Portable SPI ISR code defined in the high level driver, note, it is
- a macro.*/
- _spi_isr_code(spip);
- return;
- }
- }
- if (spip->txcnt > 0) {
- port_fifo_preload(spip);
- }
- else {
- spip->port->INTENCLR = (SPI_INTENCLR_READY_Clear << SPI_INTENCLR_READY_Pos);
- /* Portable SPI ISR code defined in the high level driver, note, it is
- a macro.*/
- _spi_isr_code(spip);
- }
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if NRF5_SPI_USE_SPI0 || defined(__DOXYGEN__)
-/**
- * @brief SPI0 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(Vector4C) {
-
- CH_IRQ_PROLOGUE();
- serve_interrupt(&SPID1);
- CH_IRQ_EPILOGUE();
-}
-#endif
-#if NRF5_SPI_USE_SPI1 || defined(__DOXYGEN__)
-/**
- * @brief SPI1 interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(Vector50) {
-
- CH_IRQ_PROLOGUE();
- serve_interrupt(&SPID2);
- CH_IRQ_EPILOGUE();
-}
-#endif
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level SPI driver initialization.
- *
- * @notapi
- */
-void spi_lld_init(void) {
-
-#if NRF5_SPI_USE_SPI0
- spiObjectInit(&SPID1);
- SPID1.port = NRF_SPI0;
-#endif
-#if NRF5_SPI_USE_SPI1
- spiObjectInit(&SPID2);
- SPID2.port = NRF_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) {
- uint32_t config;
-
- if (spip->state == SPI_STOP) {
-#if NRF5_SPI_USE_SPI0
- if (&SPID1 == spip)
- nvicEnableVector(SPI0_TWI0_IRQn, NRF5_SPI_SPI0_IRQ_PRIORITY);
-#endif
-#if NRF5_SPI_USE_SPI1
- if (&SPID2 == spip)
- nvicEnableVector(SPI1_TWI1_IRQn, NRF5_SPI_SPI1_IRQ_PRIORITY);
-#endif
- }
-
- config = spip->config->lsbfirst ?
- (SPI_CONFIG_ORDER_LsbFirst << SPI_CONFIG_ORDER_Pos) :
- (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos);
-
- switch (spip->config->mode) {
- case 1:
- config |= (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);
- config |= (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos);
- break;
- case 2:
- config |= (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);
- config |= (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos);
- break;
- case 3:
- config |= (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);
- config |= (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos);
- break;
- default:
- config |= (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);
- config |= (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos);
- break;
- }
-
- /* Configuration.*/
- spip->port->CONFIG = config;
- spip->port->PSELSCK = spip->config->sckpad;
- spip->port->PSELMOSI = spip->config->mosipad;
- spip->port->PSELMISO = spip->config->misopad;
- spip->port->FREQUENCY = spip->config->freq;
- spip->port->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos);
-
- /* clear events flag */
- spip->port->EVENTS_READY = 0;
-}
-
-/**
- * @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->port->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
- spip->port->INTENCLR = (SPI_INTENCLR_READY_Clear << SPI_INTENCLR_READY_Pos);
-#if NRF5_SPI_USE_SPI0
- if (&SPID1 == spip)
- nvicDisableVector(SPI0_TWI0_IRQn);
-#endif
-#if NRF5_SPI_USE_SPI1
- if (&SPID2 == spip)
- nvicDisableVector(SPI1_TWI1_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(IOPORT1, 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(IOPORT1, 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;
- port_fifo_preload(spip);
- spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);
-}
-
-/**
- * @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;
- port_fifo_preload(spip);
- spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);
-}
-
-/**
- * @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;
- port_fifo_preload(spip);
- spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);
-}
-
-/**
- * @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;
- port_fifo_preload(spip);
- spip->port->INTENSET = (SPI_INTENCLR_READY_Enabled << SPI_INTENCLR_READY_Pos);
-}
-
-/**
- * @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->port->TXD = (uint8_t)frame;
- while (spip->port->EVENTS_READY == 0)
- ;
- spip->port->EVENTS_READY = 0;
- return spip->port->RXD;
-}
-
-#endif /* HAL_USE_SPI */
-
-/** @} */
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