有一般收发、中断方式、DMA方式：

rt_device_t rt_device_find(const char* name);

rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflags); oflags =RT_DEVICE_FLAG_RDWR|RT_DEVICE_FLAG_INT_RX

#define RT_DEVICE_FLAG_RDWR         0x003     /* 可读写模式 */#define RT_DEVICE_FLAG_STREAM 0x040 /* 流模式 */ #define RT_DEVICE_FLAG_INT_RX 0x100 /* 中断接收模式 */ #define RT_DEVICE_FLAG_DMA_RX 0x200 /* DMA 接收模式 */ #define RT_DEVICE_FLAG_INT_TX 0x400 /* 中断发送模式 */ #define RT_DEVICE_FLAG_DMA_TX 0x800 /* DMA 发送模式 */

rt_err_t rt_device_control(rt_device_t dev, rt_uint8_t cmd, void* arg);

应用举例：

#define SAMPLE_UART_NAME       "uart2"  /* 串口设备名称 */static rt_device_t serial; /* 串口设备句柄 */ struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT; /* 配置参数 */ /* 查找串口设备 */ serial = rt_device_find(SAMPLE_UART_NAME); /* 以读写及中断接收方式打开串口设备 */ rt_device_open(serial, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX); config.baud_rate = BAUD_RATE_115200; config.data_bits = DATA_BITS_8; config.stop_bits = STOP_BITS_2; config.parity = PARITY_NONE; /* 打开设备后才可修改串口配置参数 */ rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);

相关读写：

rt_err_t rt_device_close(rt_device_t dev);

rt_size_t rt_device_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size);

rt_size_t rt_device_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size);

rt_err_t rt_device_set_rx_indicate(rt_device_t dev, rt_err_t (*rx_ind)(rt_device_t dev,rt_size_t size));//接收完成回调

rt_err_t rt_device_set_tx_complete(rt_device_t dev, rt_err_t (*tx_done)(rt_device_t dev,void *buffer));//发送完成回调