/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011,2012 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 LPC13xx/spi_lld.h * @brief LPC13xx low level SPI driver header. * * @addtogroup SPI * @{ */ #ifndef _SPI_LLD_H_ #define _SPI_LLD_H_ #if HAL_USE_SPI || defined(__DOXYGEN__) /*===========================================================================*/ /* Driver constants. */ /*===========================================================================*/ /** * @brief Hardware FIFO depth. */ #define LPC13xx_SSP_FIFO_DEPTH 8 #define CR0_DSSMASK 0x0F #define CR0_DSS4BIT 3 #define CR0_DSS5BIT 4 #define CR0_DSS6BIT 5 #define CR0_DSS7BIT 6 #define CR0_DSS8BIT 7 #define CR0_DSS9BIT 8 #define CR0_DSS10BIT 9 #define CR0_DSS11BIT 0xA #define CR0_DSS12BIT 0xB #define CR0_DSS13BIT 0xC #define CR0_DSS14BIT 0xD #define CR0_DSS15BIT 0xE #define CR0_DSS16BIT 0xF #define CR0_FRFSPI 0 #define CR0_FRFSSI 0x10 #define CR0_FRFMW 0x20 #define CR0_CPOL 0x40 #define CR0_CPHA 0x80 #define CR0_CLOCKRATE(n) ((n) << 8) #define CR1_LBM 1 #define CR1_SSE 2 #define CR1_MS 4 #define CR1_SOD 8 #define SR_TFE 1 #define SR_TNF 2 #define SR_RNE 4 #define SR_RFF 8 #define SR_BSY 16 #define IMSC_ROR 1 #define IMSC_RT 2 #define IMSC_RX 4 #define IMSC_TX 8 #define RIS_ROR 1 #define RIS_RT 2 #define RIS_RX 4 #define RIS_TX 8 #define MIS_ROR 1 #define MIS_RT 2 #define MIS_RX 4 #define MIS_TX 8 #define ICR_ROR 1 #define ICR_RT 2 /** * @brief SCK0 signal assigned to pin PIO0_10. */ #define SCK0_IS_PIO0_10 0 /** * @brief SCK0 signal assigned to pin PIO2_11. */ #define SCK0_IS_PIO2_11 1 /** * @brief SCK0 signal assigned to pin PIO0_6. */ #define SCK0_IS_PIO0_6 2 /*===========================================================================*/ /* Driver pre-compile time settings. */ /*===========================================================================*/ /** * @brief SPI1 driver enable switch. * @details If set to @p TRUE the support for device SSP0 is included. * @note The default is @p TRUE. */ #if !defined(LPC13xx_SPI_USE_SSP0) || defined(__DOXYGEN__) #define LPC13xx_SPI_USE_SSP0 TRUE #endif /** * @brief SPI2 driver enable switch. * @details If set to @p TRUE the support for device SSP1 is included. * @note The default is @p TRUE. */ #if !defined(LPC13xx_SPI_USE_SSP1) || defined(__DOXYGEN__) #define LPC13xx_SPI_USE_SSP1 FALSE #endif /** * @brief SSP0 PCLK divider. */ #if !defined(LPC13xx_SPI_SSP0CLKDIV) || defined(__DOXYGEN__) #define LPC13xx_SPI_SSP0CLKDIV 1 #endif /** * @brief SSP1 PCLK divider. */ #if !defined(LPC13xx_SPI_SSP1CLKDIV) || defined(__DOXYGEN__) #define LPC13xx_SPI_SSP1CLKDIV 1 #endif /** * @brief SPI0 interrupt priority level setting. */ #if !defined(LPC13xx_SPI_SSP0_IRQ_PRIORITY) || defined(__DOXYGEN__) #define LPC13xx_SPI_SSP0_IRQ_PRIORITY 5 #endif /** * @brief SPI1 interrupt priority level setting. */ #if !defined(LPC13xx_SPI_SSP1_IRQ_PRIORITY) || defined(__DOXYGEN__) #define LPC13xx_SPI_SSP1_IRQ_PRIORITY 5 #endif /** * @brief Overflow error hook. * @details The default action is to stop the system. */ #if !defined(LPC13xx_SPI_SSP_ERROR_HOOK) || defined(__DOXYGEN__) #define LPC13xx_SPI_SSP_ERROR_HOOK(spip) chSysHalt() #endif /** * @brief SCK0 signal selector. */ #if !defined(LPC13xx_SPI_SCK0_SELECTOR) || defined(__DOXYGEN__) #define LPC13xx_SPI_SCK0_SELECTOR SCK0_IS_PIO2_11 #endif /*===========================================================================*/ /* Derived constants and error checks. */ /*===========================================================================*/ #if (LPC13xx_SPI_SSP0CLKDIV < 1) || (LPC13xx_SPI_SSP0CLKDIV > 255) #error "invalid LPC13xx_SPI_SSP0CLKDIV setting" #endif #if (LPC13xx_SPI_SSP1CLKDIV < 1) || (LPC13xx_SPI_SSP1CLKDIV > 255) #error "invalid LPC13xx_SPI_SSP1CLKDIV setting" #endif #if !LPC13xx_SPI_USE_SSP0 && !LPC13xx_SPI_USE_SSP1 #error "SPI driver activated but no SPI peripheral assigned" #endif #if (LPC13xx_SPI_SCK0_SELECTOR != SCK0_IS_PIO0_10) && \ (LPC13xx_SPI_SCK0_SELECTOR != SCK0_IS_PIO2_11) && \ (LPC13xx_SPI_SCK0_SELECTOR != SCK0_IS_PIO0_6) #error "invalid pin assigned to SCK0 signal" #endif /** * @brief SSP0 clock. */ #define LPC13xx_SPI_SSP0_PCLK \ (LPC13xx_MAINCLK / LPC13xx_SPI_SSP0CLKDIV) /** * @brief SSP1 clock. */ #define LPC13xx_SPI_SSP1_PCLK \ (LPC13xx_MAINCLK / LPC13xx_SPI_SSP1CLKDIV) /*===========================================================================*/ /* Driver data structures and types. */ /*===========================================================================*/ /** * @brief Type of a structure representing an SPI driver. */ typedef struct SPIDriver SPIDriver; /** * @brief SPI notification callback type. * * @param[in] spip pointer to the @p SPIDriver object triggering the * callback */ typedef void (*spicallback_t)(SPIDriver *spip); /** * @brief Driver configuration structure. */ typedef struct { /** * @brief Operation complete callback or @p NULL. */ spicallback_t end_cb; /* End of the mandatory fields.*/ /** * @brief The chip select line port. */ ioportid_t ssport; /** * @brief The chip select line pad number. */ uint16_t sspad; /** * @brief SSP CR0 initialization data. */ uint16_t cr0; /** * @brief SSP CPSR initialization data. */ uint32_t cpsr; } SPIConfig; /** * @brief Structure representing a SPI driver. */ struct SPIDriver { /** * @brief Driver state. */ spistate_t state; /** * @brief Current configuration data. */ const SPIConfig *config; #if SPI_USE_WAIT || defined(__DOXYGEN__) /** * @brief Waiting thread. */ Thread *thread; #endif /* SPI_USE_WAIT */ #if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__) #if CH_USE_MUTEXES || defined(__DOXYGEN__) /** * @brief Mutex protecting the bus. */ Mutex mutex; #elif CH_USE_SEMAPHORES Semaphore semaphore; #endif #endif /* SPI_USE_MUTUAL_EXCLUSION */ #if defined(SPI_DRIVER_EXT_FIELDS) SPI_DRIVER_EXT_FIELDS #endif /* End of the mandatory fields.*/ /** * @brief Pointer to the SSP registers block. */ LPC_SSP_TypeDef *ssp; /** * @brief Number of bytes yet to be received. */ uint32_t rxcnt; /** * @brief Receive pointer or @p NULL. */ void *rxptr; /** * @brief Number of bytes yet to be transmitted. */ uint32_t txcnt; /** * @brief Transmit pointer or @p NULL. */ const void *txptr; }; /*===========================================================================*/ /* Driver macros. */ /*===========================================================================*/ /*===========================================================================*/ /* External declarations. */ /*===========================================================================*/ #if LPC13xx_SPI_USE_SSP0 && !defined(__DOXYGEN__) extern SPIDriver SPID1; #endif #if LPC13xx_SPI_USE_SSP1 && !defined(__DOXYGEN__) extern SPIDriver SPID2; #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); uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame); #ifdef __cplusplus } #endif #endif /* HAL_USE_SPI */ #endif /* _SPI_LLD_H_ */ /** @} */