/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011 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 STM32/i2c_lld.h * @brief STM32 I2C subsystem low level driver header. * @addtogroup I2C * @{ */ #ifndef _I2C_LLD_H_ #define _I2C_LLD_H_ #if HAL_USE_I2C || defined(__DOXYGEN__) /*===========================================================================*/ /* Driver constants. */ /*===========================================================================*/ /*===========================================================================*/ /* Driver pre-compile time settings. */ /*===========================================================================*/ /** * @name Configuration options * @{ */ /** * @brief I2C1 driver enable switch. * @details If set to @p TRUE the support for I2C1 is included. * @note The default is @p TRUE. */ #if !defined(STM32_I2C_USE_I2C1) || defined(__DOXYGEN__) #define STM32_I2C_USE_I2C1 TRUE #endif /** * @brief I2C2 driver enable switch. * @details If set to @p TRUE the support for I2C2 is included. * @note The default is @p TRUE. */ #if !defined(STM32_I2C_USE_I2C2) || defined(__DOXYGEN__) #define STM32_I2C_USE_I2C2 TRUE #endif /** * @brief I2C1 interrupt priority level setting. * @note @p BASEPRI_KERNEL >= @p STM32_I2C_I2C1_IRQ_PRIORITY > @p PRIORITY_PENDSV. */ #if !defined(STM32_I2C_I2C1_IRQ_PRIORITY) || defined(__DOXYGEN__) #define STM32_I2C_I2C1_IRQ_PRIORITY 0xA0 #endif /** * @brief I2C2 interrupt priority level setting. * @note @p BASEPRI_KERNEL >= @p STM32_I2C_I2C2_IRQ_PRIORITY > @p PRIORITY_PENDSV. */ #if !defined(STM32_I2C_I2C2_IRQ_PRIORITY) || defined(__DOXYGEN__) #define STM32_I2C_I2C2_IRQ_PRIORITY 0xA0 #endif /** @} */ /*===========================================================================*/ /* Derived constants and error checks. */ /*===========================================================================*/ /** @brief EV5 */ #define I2C_EV5_MASTER_MODE_SELECT ((uint32_t)(((I2C_SR2_MSL | I2C_SR2_BUSY) << 16) | I2C_SR1_SB)) /* BUSY, MSL and SB flag */ #define I2C_EV8_2_MASTER_BYTE_TRANSMITTED ((uint32_t)(((I2C_SR2_MSL | I2C_SR2_BUSY | I2C_SR2_TRA) << 16) | I2C_SR1_BTF | I2C_SR1_TXE)) /* TRA, BUSY, MSL, TXE and BTF flags */ #define I2C_EV_MASK 0x00FFFFFF /* First byte zeroed because there is no need of PEC register part from SR2 */ #define I2C_FLG_MASTER_RECEIVER 0x10 #define I2C_FLG_HEADER_SENT 0x80 /*===========================================================================*/ /* Driver data structures and types. */ /*===========================================================================*/ /** * @brief I2C Driver condition flags type. */ typedef uint32_t i2cflags_t; typedef enum { OPMODE_I2C = 1, OPMODE_SMBUS_DEVICE = 2, OPMODE_SMBUS_HOST = 3, } i2copmode_t; typedef enum { STD_DUTY_CYCLE = 1, FAST_DUTY_CYCLE_2 = 2, FAST_DUTY_CYCLE_16_9 = 3, } i2cdutycycle_t; /** * @brief Driver configuration structure. */ typedef struct { i2copmode_t op_mode; /**< @brief Specifies the I2C mode.*/ uint32_t clock_speed; /**< @brief Specifies the clock frequency. Must be set to a value lower than 400kHz */ i2cdutycycle_t duty_cycle; /**< @brief Specifies the I2C fast mode duty cycle */ } I2CConfig; /** * @brief Type of a structure representing an I2C driver. */ typedef struct I2CDriver I2CDriver; /** * @brief Type of a structure representing an I2C slave config. */ typedef struct I2CSlaveConfig I2CSlaveConfig; /** * @brief Structure representing an I2C driver. */ struct I2CDriver{ /** * @brief Driver state. */ i2cstate_t id_state; #if I2C_USE_WAIT /** * @brief Thread waiting for I/O completion. */ Thread *id_thread; #endif /* I2C_USE_WAIT */ #if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__) #if CH_USE_MUTEXES || defined(__DOXYGEN__) /** * @brief Mutex protecting the bus. */ Mutex id_mutex; #elif CH_USE_SEMAPHORES Semaphore id_semaphore; #endif #endif /* I2C_USE_MUTUAL_EXCLUSION */ /** * @brief Current configuration data. */ const I2CConfig *id_config; /** * @brief Current slave configuration data. */ const I2CSlaveConfig *id_slave_config; __IO size_t txbytes; /*!< @brief Number of bytes to be transmitted. */ __IO size_t rxbytes; /*!< @brief Number of bytes to be received. */ uint8_t *rxbuf; /*!< @brief Pointer to receive buffer. */ uint8_t *txbuf; /*!< @brief Pointer to transmit buffer.*/ __IO i2cflags_t errors; /*!< @brief Error flags.*/ __IO i2cflags_t flags; /*!< @brief State flags.*/ uint8_t slave_addr; /*!< @brief Current slave address without R/W bit. */ #if CH_USE_EVENTS EventSource sevent; /*!< @brief Status Change @p EventSource.*/ #endif /*********** End of the mandatory fields. **********************************/ uint32_t dmamode; /*!< @brief DMA mode bit mask.*/ const stm32_dma_stream_t *dmarx; /*!< @brief Receive DMA channel.*/ const stm32_dma_stream_t *dmatx; /*!< @brief Transmit DMA channel.*/ I2C_TypeDef *id_i2c; /*!< @brief Pointer to the I2Cx registers block. */ }; /*===========================================================================*/ /* Driver macros. */ /*===========================================================================*/ #define i2c_lld_bus_is_busy(i2cp) \ (i2cp->id_i2c->SR2 & I2C_SR2_BUSY) /* Wait until BUSY flag is reset: a STOP has been generated on the bus * signaling the end of transmission. Normally this wait function * does not block thread, only if slave not response it does. */ #define i2c_lld_wait_bus_free(i2cp) { \ uint32_t tmo = 0xfffff; \ while((i2cp->id_i2c->SR2 & I2C_SR2_BUSY) && tmo--) \ ; \ } /*===========================================================================*/ /* External declarations. */ /*===========================================================================*/ /** @cond never*/ #if STM32_I2C_USE_I2C1 extern I2CDriver I2CD1; #endif #if STM32_I2C_USE_I2C2 extern I2CDriver I2CD2; #endif #if STM32_I2C_USE_I2C3 extern I2CDriver I2CD3; #endif #ifdef __cplusplus extern "C" { #endif void i2c_lld_init(void); void i2c_lld_reset(I2CDriver *i2cp); void i2c_lld_set_clock(I2CDriver *i2cp); void i2c_lld_set_opmode(I2CDriver *i2cp); void i2c_lld_start(I2CDriver *i2cp); void i2c_lld_stop(I2CDriver *i2cp); void i2c_lld_master_transmit(I2CDriver *i2cp, uint8_t slave_addr, uint8_t *txbuf, size_t txbytes, uint8_t *rxbuf, size_t rxbytes); void i2c_lld_master_receive(I2CDriver *i2cp, uint8_t slave_addr, uint8_t *rxbuf, size_t rxbytes); #ifdef __cplusplus } #endif /** @endcond*/ #endif /* CH_HAL_USE_I2C */ #endif /* _I2C_LLD_H_ */