text: /*
   * Copyright (c) 2006-2022, RT-Thread Development Team
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * 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
   * 2011-12-20   onelife     Change USART status format
   */
  
  #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_TX_BUSY         (1 << 1)
  #define USART_STATE_RX_BUSY         (1 << 2)
  #if defined(UART_PRESENT)
  #define USART_STATE_ASYNC_ONLY      (1 << 3)
  #endif
  #define USART_STATE_SYNC            (1 << 4)
  #define USART_STATE_MASTER          (1 << 5)
  #define USART_STATE_AUTOCS          (1 << 6)
  #define USART_STATE_9BIT            (1 << 7)
  #define USART_CLK_MODE_GET(state)   ((state >> 8) & 0x03)
  
  #define SYNC_SETTING_MASK           (0x1F)
  #define SYNC_SETTING_SHIFT          (5)
  
  /* Exported functions ------------------------------------------------------- */
  void rt_hw_usart_init(void);
  
  #endif /* __DRV_USART_H__ */
  