rt-thread/bsp/efm32/drv_iic.h

/***************************************************************************//**
 * @file 	drv_iic.h
 * @brief 	IIC driver of RT-Thread RTOS for EFM32
 * 	COPYRIGHT (C) 2011, RT-Thread Development Team
 * @author 	onelife
 * @version 0.4 beta
 *******************************************************************************
 * @section License
 * The license and distribution terms for this file may be found in the file 
 * LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
 *******************************************************************************
 * @section Change Logs
 * Date			Author		Notes
 * 2011-01-07	onelife		Initial creation for EFM32
 * 2011-07-11	onelife		Add lock (semaphore) to prevent simultaneously 
 *  access
 * 2011-08-04	onelife		Change the usage of the second parameter of Read 
 *  and Write functions from (seldom used) "Offset" to "Slave address"
 * 2011-08-04	onelife		Add a timer to prevent from forever waiting
 ******************************************************************************/
#ifndef __DRV_IIC_H__
#define __DRV_IIC_H__

/* Includes ------------------------------------------------------------------*/
/* Exported types ------------------------------------------------------------*/
struct efm32_iic_int_mode_t
{
	rt_uint8_t  *data_ptr;
	rt_uint8_t  data_size;
	rt_uint32_t read_index, save_index;
};

struct efm32_iic_device_t
{
	/* Counter */
	rt_uint32_t 				counter;
	/* Lock */
	struct rt_semaphore 		*lock;
	/* Pointer to timer */
	rt_timer_t 					timer;
	/* Timeout flag */
	volatile rt_bool_t 			timeout;
	/* State */
	rt_uint8_t 					state;
	/*  Pointer to IIC device structure */
	I2C_TypeDef 				*iic_device;
	/*  Self address */
	rt_uint16_t					address;
	/* RX structure */
	struct efm32_iic_int_mode_t	*rx_buffer;
};

struct efm32_iic_control_t
{
	rt_uint8_t 		config;
	rt_uint16_t		address;
};

/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
#define IIC_STATE_MASTER 	(1 << 0)
#define IIC_STATE_BROADCAST (1 << 1)
//#define IIC_STATE_TX_BUSY 	(1 << 2)
#define IIC_STATE_RX_BUSY 	(1 << 3)
#define IIC_TIMEOUT_PERIOD 	(RT_TICK_PER_SECOND)

/* Exported functions --------------------------------------------------------*/
void rt_hw_iic_init(void);

#endif /* __DRV_IIC_H__ */