①用CubeMX配置好Single Wire（Half-Duplex）模式，其他的默认
②用CubeMX配置好Clock
③生成代码后需要将HAL_UART_MspInit函数中的GPIO_Mode改为GPIO_MODE_AF_PP模式，需要将Pull改为GPIO_PULLUP，需要将Speed改为GPIO_SPEED_FREQ_HIGH。
- 1 /**USART1 GPIO Configuration
- 2 PA9 ------> USART1_TX
- 3 */
- 4 GPIO_InitStruct.Pin = GPIO_PIN_9;
- 5 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
- 6 GPIO_InitStruct.Pull = GPIO_PULLUP;
- 7 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
- 8 GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
- 9 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
④发送的时候需要启动HAL_HalfDuplex_EnableTransmitter
⑤接收的时候需要启动HAL_HalfDuplex_EnableReceiver
- 1 static uint8_t data = 0x55;
- 2 while (1)
- 3 {
- 4 HAL_HalfDuplex_EnableTransmitter(&huart1);
- 5 HAL_UART_Transmit(&huart1, &data, 1, 0xffff);
- 6 HAL_HalfDuplex_EnableReceiver(&huart1);
- 7 HAL_Delay(1000);
- 8 }
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