rt-thread/bsp/efm32/drv_iic.h

71 lines
2.4 KiB
C

/***************************************************************************//**
* @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__ */