71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/***************************************************************************//**
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* @file drv_iic.h
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* @brief IIC driver of RT-Thread RTOS for EFM32
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* COPYRIGHT (C) 2011, RT-Thread Development Team
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* @author onelife
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* @version 0.4 beta
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*******************************************************************************
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* @section License
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* The license and distribution terms for this file may be found in the file
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* LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
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*******************************************************************************
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* @section Change Logs
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* Date Author Notes
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* 2011-01-07 onelife Initial creation for EFM32
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* 2011-07-11 onelife Add lock (semaphore) to prevent simultaneously
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* access
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* 2011-08-04 onelife Change the usage of the second parameter of Read
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* and Write functions from (seldom used) "Offset" to "Slave address"
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* 2011-08-04 onelife Add a timer to prevent from forever waiting
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******************************************************************************/
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#ifndef __DRV_IIC_H__
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#define __DRV_IIC_H__
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/* Includes ------------------------------------------------------------------*/
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/* Exported types ------------------------------------------------------------*/
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struct efm32_iic_int_mode_t
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{
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rt_uint8_t *data_ptr;
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rt_uint8_t data_size;
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rt_uint32_t read_index, save_index;
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};
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struct efm32_iic_device_t
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{
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/* Counter */
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rt_uint32_t counter;
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/* Lock */
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struct rt_semaphore *lock;
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/* Pointer to timer */
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rt_timer_t timer;
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/* Timeout flag */
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volatile rt_bool_t timeout;
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/* State */
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rt_uint8_t state;
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/* Pointer to IIC device structure */
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I2C_TypeDef *iic_device;
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/* Self address */
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rt_uint16_t address;
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/* RX structure */
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struct efm32_iic_int_mode_t *rx_buffer;
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};
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struct efm32_iic_control_t
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{
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rt_uint8_t config;
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rt_uint16_t address;
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};
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/* Exported constants --------------------------------------------------------*/
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/* Exported macro ------------------------------------------------------------*/
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#define IIC_STATE_MASTER (1 << 0)
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#define IIC_STATE_BROADCAST (1 << 1)
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//#define IIC_STATE_TX_BUSY (1 << 2)
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#define IIC_STATE_RX_BUSY (1 << 3)
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#define IIC_TIMEOUT_PERIOD (RT_TICK_PER_SECOND)
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/* Exported functions --------------------------------------------------------*/
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void rt_hw_iic_init(void);
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#endif /* __DRV_IIC_H__ */
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