From 707b3a2f97ef9751e42bc377d68ff8479f3ef438 Mon Sep 17 00:00:00 2001 From: Stephane D'Alu Date: Fri, 8 Jul 2016 12:58:25 +0200 Subject: renamed port to NRF5 to make room for NRF52832 chip --- os/hal/ports/NRF5/NRF51822/hal_spi_lld.c | 374 +++++++++++++++++++++++++++++++ 1 file changed, 374 insertions(+) create mode 100644 os/hal/ports/NRF5/NRF51822/hal_spi_lld.c (limited to 'os/hal/ports/NRF5/NRF51822/hal_spi_lld.c') diff --git a/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c b/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c new file mode 100644 index 0000000..7a70c13 --- /dev/null +++ b/os/hal/ports/NRF5/NRF51822/hal_spi_lld.c @@ -0,0 +1,374 @@ +/* + 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 NRF51_SPI_USE_SPI0 || defined(__DOXYGEN__) +/** @brief SPI1 driver identifier.*/ +SPIDriver SPID1; +#endif + +#if NRF51_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 NRF51_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 NRF51_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 NRF51_SPI_USE_SPI0 + spiObjectInit(&SPID1); + SPID1.port = NRF_SPI0; +#endif +#if NRF51_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 NRF51_SPI_USE_SPI0 + if (&SPID1 == spip) + nvicEnableVector(SPI0_TWI0_IRQn, NRF51_SPI_SPI0_IRQ_PRIORITY); +#endif +#if NRF51_SPI_USE_SPI1 + if (&SPID2 == spip) + nvicEnableVector(SPI1_TWI1_IRQn, NRF51_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 NRF51_SPI_USE_SPI0 + if (&SPID1 == spip) + nvicDisableVector(SPI0_TWI0_IRQn); +#endif +#if NRF51_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 */ + +/** @} */ -- cgit v1.2.3