85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/***************************************************************************//**
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* @file drv_usart.h
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* @brief USART driver of RT-Thread RTOS for EFM32
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* COPYRIGHT (C) 2012, RT-Thread Development Team
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* @author onelife
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* @version 1.0
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*******************************************************************************
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* @section License
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* The license and distribution terms for this file may be found in the file
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* LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
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*******************************************************************************
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* @section Change Logs
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* Date Author Notes
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* 2010-12-22 onelife Initial creation for EFM32
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* 2011-06-27 onelife Fix a bug when using compiler optimization
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* 2011-07-26 onelife Add lock (semaphore) to prevent simultaneously
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* access
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* 2011-12-09 onelife Add giant gecko support
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* 2011-12-09 onelife Add UART module support
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* 2011-12-20 onelife Change USART status format
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******************************************************************************/
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#ifndef __DRV_USART_H__
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#define __DRV_USART_H__
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/* Includes ------------------------------------------------------------------*/
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/* Exported types ------------------------------------------------------------*/
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struct efm32_usart_int_mode_t
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{
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rt_uint8_t *data_ptr;
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rt_uint8_t data_size;
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rt_uint32_t read_index, save_index;
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};
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struct efm32_usart_dma_mode_t
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{
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/* DMA Channel */
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rt_uint32_t dma_channel;
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/* buffer info */
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rt_uint32_t *data_ptr;
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rt_uint8_t data_size;
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};
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struct efm32_usart_device_t
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{
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/* Counter */
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rt_uint32_t counter;
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/* Lock */
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struct rt_semaphore *lock;
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/* Unit number */
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rt_uint8_t unit;
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/* State */
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volatile rt_uint8_t state;
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/* Pointer to USART device structure */
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USART_TypeDef *usart_device;
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/* Pointer to RX structure */
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void *rx_mode;
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/* Pointer to TX structure */
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void *tx_mode;
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};
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/* Exported constants --------------------------------------------------------*/
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/* Exported macro ------------------------------------------------------------*/
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#define USART_WAIT_TIME_TX (RT_TICK_PER_SECOND / 100 * 3)
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#define USART_STATE_CONSOLE (1 << 0)
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#define USART_STATE_TX_BUSY (1 << 1)
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#define USART_STATE_RX_BUSY (1 << 2)
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#if defined(UART_PRESENT)
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#define USART_STATE_ASYNC_ONLY (1 << 3)
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#endif
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#define USART_STATE_SYNC (1 << 4)
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#define USART_STATE_MASTER (1 << 5)
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#define USART_STATE_AUTOCS (1 << 6)
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#define USART_STATE_9BIT (1 << 7)
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#define USART_CLK_MODE_GET(state) ((state >> 8) & 0x03)
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#define SYNC_SETTING_MASK (0x1F)
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#define SYNC_SETTING_SHIFT (5)
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/* Exported functions ------------------------------------------------------- */
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void rt_hw_usart_init(void);
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#endif /* __DRV_USART_H__ */
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