/***************************************************************************//**
 * @file 	drv_usart.h
 * @brief 	USART 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
 * 2010-12-22	onelife		Initial creation for EFM32
 * 2011-06-27	onelife		Fix a bug when using compiler optimization
 * 2011-07-26	onelife		Add lock (semaphore) to prevent simultaneously 
 *  access
 ******************************************************************************/
#ifndef __DRV_USART_H__
#define __DRV_USART_H__

/* Includes ------------------------------------------------------------------*/
/* Exported types ------------------------------------------------------------*/
struct efm32_usart_int_mode_t
{
	rt_uint8_t  		*data_ptr;
	rt_uint8_t  		data_size;
	rt_uint32_t 		read_index, save_index;
};

struct efm32_usart_dma_mode_t
{
	/* DMA Channel */
	rt_uint32_t 		dma_channel;

	/* buffer info */
	rt_uint32_t 		*data_ptr;
	rt_uint8_t  		data_size;
};

struct efm32_usart_device_t
{
	/* Counter */
	rt_uint32_t 		counter;
	/* Lock */
	struct rt_semaphore	*lock;
	/* Unit number */
	rt_uint8_t 			unit;
	/* State */
	volatile rt_uint8_t	state;
	/*  Pointer to USART device structure */
	USART_TypeDef 		*usart_device;
	/* Pointer to RX structure */
	void 				*rx_mode;
	/* Pointer to TX structure */
	void 				*tx_mode;
};

/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
#define USART_WAIT_TIME_TX		(RT_TICK_PER_SECOND / 100 * 3)

#define USART_STATE_CONSOLE 	(1 << 0)
#define USART_STATE_SYNC		(1 << 1)
#define USART_STATE_MASTER		(1 << 2)
#define USART_STATE_AUTOCS 		(1 << 3)
#define USART_STATE_TX_BUSY 	(1 << 4)
#define USART_STATE_RX_BUSY 	(1 << 5)


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

#endif /* __DRV_USART_H__ */