From c82d270d18cddcf15a0ccfcc95e861c33add8861 Mon Sep 17 00:00:00 2001 From: gdisirio Date: Sat, 19 Dec 2009 11:10:08 +0000 Subject: LPC214x SPI driver added. git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1442 35acf78f-673a-0410-8e92-d51de3d6d3f4 --- os/hal/platforms/LPC214x/lpc214x.h | 5 +- os/hal/platforms/LPC214x/platform.mk | 1 + os/hal/platforms/LPC214x/spi_lld.c | 216 +++++++++++++++++++++++++++++++++++ os/hal/platforms/LPC214x/spi_lld.h | 150 ++++++++++++++++++++++++ 4 files changed, 370 insertions(+), 2 deletions(-) create mode 100644 os/hal/platforms/LPC214x/spi_lld.c create mode 100644 os/hal/platforms/LPC214x/spi_lld.h (limited to 'os/hal/platforms/LPC214x') diff --git a/os/hal/platforms/LPC214x/lpc214x.h b/os/hal/platforms/LPC214x/lpc214x.h index ad6ae375b..88e8d8ae1 100644 --- a/os/hal/platforms/LPC214x/lpc214x.h +++ b/os/hal/platforms/LPC214x/lpc214x.h @@ -25,8 +25,9 @@ #ifndef _LPC214X_H_ #define _LPC214X_H_ -typedef volatile unsigned char IOREG8; -typedef volatile unsigned int IOREG32; +typedef volatile uint8_t IOREG8; +typedef volatile uint16_t IOREG16; +typedef volatile uint32_t IOREG32; /* * System. diff --git a/os/hal/platforms/LPC214x/platform.mk b/os/hal/platforms/LPC214x/platform.mk index 3625b157f..0253e47f7 100644 --- a/os/hal/platforms/LPC214x/platform.mk +++ b/os/hal/platforms/LPC214x/platform.mk @@ -2,6 +2,7 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/platforms/LPC214x/hal_lld.c \ ${CHIBIOS}/os/hal/platforms/LPC214x/pal_lld.c \ ${CHIBIOS}/os/hal/platforms/LPC214x/serial_lld.c \ + ${CHIBIOS}/os/hal/platforms/LPC214x/spi_lld.c \ ${CHIBIOS}/os/hal/platforms/LPC214x/vic.c # Required include directories diff --git a/os/hal/platforms/LPC214x/spi_lld.c b/os/hal/platforms/LPC214x/spi_lld.c new file mode 100644 index 000000000..f3f3e13b7 --- /dev/null +++ b/os/hal/platforms/LPC214x/spi_lld.c @@ -0,0 +1,216 @@ +/* + ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio. + + This file is part of ChibiOS/RT. + + ChibiOS/RT is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + ChibiOS/RT is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +/** + * @file templates/spi_lld.c + * @brief SPI Driver subsystem low level driver source template. + * @addtogroup SPI_LLD + * @{ + */ + +#include "ch.h" +#include "hal.h" + +#if CH_HAL_USE_SPI || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Low Level Driver exported variables. */ +/*===========================================================================*/ + +#if USE_LPC214x_SPI1 || defined(__DOXYGEN__) +/** @brief SPI1 driver identifier.*/ +SPIDriver SPID1; +#endif + +/*===========================================================================*/ +/* Low Level Driver local variables. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Low Level Driver local functions. */ +/*===========================================================================*/ + +/** + * @brief Synchronous SSP transfer. + * + * @param[in] n number of bytes to be exchanged + * + * @param[in] txbuf the pointer to the transmit buffer or @p NULL + * @param[out] rxbuf the pointer to the receive buffer or @p NULL + */ +void rw8(size_t n, const uint8_t *txbuf, uint8_t *rxbuf) { + + while (n > 0) { + if (SSPBase->SSP_SR & SR_RNE) { + uint8_t w = SSPBase->SSP_DR; + if (rxbuf != NULL) + *rxbuf++ = w; + n--; + continue; /* Priority over transmission. */ + } + if (SSPBase->SSP_SR & SR_TNF) { + if (txbuf != NULL) + SSPBase->SSP_DR = *txbuf++; + else + SSPBase->SSP_DR = 0xFF; + } + } +} + +/*===========================================================================*/ +/* Low Level Driver interrupt handlers. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Low Level Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Low level SPI driver initialization. + */ +void spi_lld_init(void) { + +#if USE_LPC214x_SPI1 + spiObjectInit(&SPID1); +#endif +} + +/** + * @brief Configures and activates the SPI peripheral. + * + * @param[in] spip pointer to the @p SPIDriver object + */ +void spi_lld_start(SPIDriver *spip) { + + if (spip->spd_state == SPI_STOP) { + /* Clock activation.*/ + PCONP = (PCONP & PCALL) | PCSPI1; + } + /* Configuration.*/ + SSPBase->SSP_CR1 = 0; + SSPBase->SSP_CR0 = spip->spd_config->spc_cr0; + SSPBase->SSP_CPSR = spip->spd_config->spc_cpsr; + SSPBase->SSP_CR1 = spip->spd_config->spc_cr1 | CR1_SSE; +} + +/** + * @brief Deactivates the SPI peripheral. + * + * @param[in] spip pointer to the @p SPIDriver object + */ +void spi_lld_stop(SPIDriver *spip) { + + if (spip->spd_state != SPI_STOP) { + SSPBase->SSP_CR1 = 0; + SSPBase->SSP_CR0 = 0; + SSPBase->SSP_CPSR = 0; + PCONP &= ~PCSPI1; + } +} + +/** + * @brief Asserts the slave select signal and prepares for transfers. + * + * @param[in] spip pointer to the @p SPIDriver object + */ +void spi_lld_select(SPIDriver *spip) { + + palClearPad(spip->spd_config->spc_ssport, spip->spd_config->spc_sspad); +} + +/** + * @brief Deasserts the slave select signal. + * @details The previously selected peripheral is unselected. + * + * @param[in] spip pointer to the @p SPIDriver object + */ +void spi_lld_unselect(SPIDriver *spip) { + + palSetPad(spip->spd_config->spc_ssport, spip->spd_config->spc_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 + */ +void spi_lld_ignore(SPIDriver *spip, size_t n) { + + (void)spip; + rw8(n, NULL, NULL); +} + +/** + * @brief Exchanges data on the SPI bus. + * @details This function performs a simultaneous transmit/receive operation. + * + * @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 + * + * @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. + */ +void spi_lld_exchange(SPIDriver *spip, size_t n, + const void *txbuf, void *rxbuf) { + + (void)spip; + rw8(n, txbuf, rxbuf); +} + +/** + * @brief Sends data ever the SPI bus. + * + * @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 + * + * @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. + */ +void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) { + + (void)spip; + rw8(n, txbuf, NULL); +} + +/** + * @brief Receives data from the SPI bus. + * + * @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 + * + * @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. + */ +void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) { + + (void)spip; + rw8(n, NULL, rxbuf); +} + +#endif /* CH_HAL_USE_SPI */ + +/** @} */ diff --git a/os/hal/platforms/LPC214x/spi_lld.h b/os/hal/platforms/LPC214x/spi_lld.h new file mode 100644 index 000000000..4d174b587 --- /dev/null +++ b/os/hal/platforms/LPC214x/spi_lld.h @@ -0,0 +1,150 @@ +/* + ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio. + + This file is part of ChibiOS/RT. + + ChibiOS/RT is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + ChibiOS/RT is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +/** + * @file templates/spi_lld.h + * @brief SPI Driver subsystem low level driver header template. + * @addtogroup SPI_LLD + * @{ + */ + +#ifndef _SPI_LLD_H_ +#define _SPI_LLD_H_ + +#if CH_HAL_USE_SPI || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Driver constants. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver pre-compile time settings. */ +/*===========================================================================*/ + +/** + * @brief Enables the mutual exclusion APIs on the SPI bus. + */ +#if !defined(SPI_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__) +#define SPI_USE_MUTUAL_EXCLUSION TRUE +#endif + +/** + * @brief SPI1 (SSP) driver enable switch. + * @details If set to @p TRUE the support for SPI0 is included. + * @note The default is @p TRUE. + */ +#if !defined(USE_LPC214x_SPI1) || defined(__DOXYGEN__) +#define USE_LPC214x_SPI1 TRUE +#endif + +/*===========================================================================*/ +/* Derived constants and error checks. */ +/*===========================================================================*/ + +#if SPI_USE_MUTUAL_EXCLUSION && !CH_USE_MUTEXES && !CH_USE_SEMAPHORES +#error "SPI_USE_MUTUAL_EXCLUSION requires CH_USE_MUTEXES and/or CH_USE_SEMAPHORES" +#endif + +/*===========================================================================*/ +/* Driver data structures and types. */ +/*===========================================================================*/ + +/** + * @brief Driver configuration structure. + */ +typedef struct { + /** + * @brief The chip select line port. + */ + ioportid_t spc_ssport; + /** + * @brief The chip select line pad number. + */ + uint16_t spc_sspad; + /** + * @brief SSP CR0 initialization data. + */ + uint16_t spc_cr0; + /** + * @brief SSP CR1 initialization data. + */ + uint16_t spc_cr1; + /** + * @brief SSP CPSR initialization data. + */ + uint32_t spc_cpsr; +} SPIConfig; + +/** + * @brief Structure representing a SPI driver. + */ +typedef struct { + /** + * @brief Driver state. + */ + spistate_t spd_state; +#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__) +#if CH_USE_MUTEXES || defined(__DOXYGEN__) + /** + * @brief Mutex protecting the bus. + */ + Mutex spd_mutex; +#elif CH_USE_SEMAPHORES + Semaphore spd_semaphore; +#endif +#endif /* SPI_USE_MUTUAL_EXCLUSION */ + /** + * @brief Current configuration data. + */ + const SPIConfig *spd_config; + /* End of the mandatory fields.*/ +} SPIDriver; + +/*===========================================================================*/ +/* External declarations. */ +/*===========================================================================*/ + +/** @cond never*/ +#if USE_LPC214x_SPI1 +extern SPIDriver SPID1; +#endif + +#ifdef __cplusplus +extern "C" { +#endif + void spi_lld_init(void); + void spi_lld_start(SPIDriver *spip); + void spi_lld_stop(SPIDriver *spip); + void spi_lld_select(SPIDriver *spip); + void spi_lld_unselect(SPIDriver *spip); + void spi_lld_ignore(SPIDriver *spip, size_t n); + void spi_lld_exchange(SPIDriver *spip, size_t n, + const void *txbuf, void *rxbuf); + void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf); + void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf); +#ifdef __cplusplus +} +#endif +/** @endcond*/ + +#endif /* CH_HAL_USE_SPI */ + +#endif /* _SPI_LLD_H_ */ + +/** @} */ -- cgit v1.2.3