text: /***************************************************************************//**
   * @file    drv_leuart.h
   * @brief   LEUART driver of RT-Thread RTOS for EFM32
   *  COPYRIGHT (C) 2012, RT-Thread Development Team
   * @author  onelife
   * @version 1.0
   *******************************************************************************
   * @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
   * 2011-12-09   onelife     Initial creation for EFM32
   ******************************************************************************/
  #ifndef __DRV_LEUSART_H__
  #define __DRV_LEUSART_H__
  
  /* Includes ------------------------------------------------------------------*/
  /* Exported types ------------------------------------------------------------*/
  struct efm32_leuart_int_mode_t
  {
      rt_uint8_t          *data_ptr;
      rt_uint8_t          data_size;
      rt_uint32_t         read_index, save_index;
  };
  
  struct efm32_leuart_dma_mode_t
  {
      /* DMA Channel */
      rt_uint32_t         dma_channel;
  
      /* buffer info */
      rt_uint32_t         *data_ptr;
      rt_uint8_t          data_size;
  };
  
  struct efm32_leuart_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 LEUART device structure */
      LEUART_TypeDef      *leuart_device;
      /* Pointer to RX structure */
      void                *rx_mode;
      /* Pointer to TX structure */
      void                *tx_mode;
  };
  
  /* Exported constants --------------------------------------------------------*/
  /* Exported macro ------------------------------------------------------------*/
  #define LEUART_WAIT_TIME_TX     (RT_TICK_PER_SECOND / 100 * 3)
  
  #define LEUART_STATE_CONSOLE    (1 << 0)
  #define LEUART_STATE_SYNC       (1 << 1)
  #define LEUART_STATE_MASTER     (1 << 2)
  #define LEUART_STATE_AUTOCS     (1 << 3)
  #define LEUART_STATE_TX_BUSY    (1 << 4)
  #define LEUART_STATE_RX_BUSY    (1 << 5)
  
  
  /* Exported functions ------------------------------------------------------- */
  void rt_hw_leuart_init(void);
  
  #endif /* __DRV_LEUSART_H__ */
  
  