rt-thread-official/bsp/efm32/drv_usart.h

78 lines
2.5 KiB
C

/***************************************************************************//**
* @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
* 2011-12-09 onelife Add giant gecko support
* 2011-12-09 onelife Add UART module support
******************************************************************************/
#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_ASYNC_ONLY (1 << 1)
#define USART_STATE_SYNC (1 << 2)
#define USART_STATE_MASTER (1 << 3)
#define USART_STATE_AUTOCS (1 << 4)
#define USART_STATE_TX_BUSY (1 << 5)
#define USART_STATE_RX_BUSY (1 << 6)
/* Exported functions ------------------------------------------------------- */
void rt_hw_usart_init(void);
#endif /* __DRV_USART_H__ */