GD32F130串口配置问题，有谁遇到？

只看该作者 · 2015-9-20 23:20

使用USART1，看固件库里面配置tx和rx引脚都是推挽输出，搞不明白，为什么这没配置，rx不是应该配置为输入模式么？

/* Enable GPIOA clock */
RCC_AHBPeriphClock_Enable( RCC_AHBPERIPH_GPIOA , ENABLE );

/* Enable USART1 APB clock */
RCC_APB2PeriphClock_Enable( RCC_APB2PERIPH_USART1 , ENABLE );

/* USART1 Pins configuration **************************************************/
GPIO_DeInit( GPIOA );

{
      /* Configure the GPIO ports */
      GPIO_InitPara GPIO_InitStructure;
      /* Connect pin to Periph */
      GPIO_PinAFConfig( GPIOA , GPIO_PINSOURCE9, GPIO_AF_1 );
      GPIO_PinAFConfig( GPIOA , GPIO_PINSOURCE10, GPIO_AF_1 );

      /* Configure pins as AF pushpull */
      GPIO_InitStructure.GPIO_Pin    = GPIO_PIN_9 | GPIO_PIN_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF;
      GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
      GPIO_InitStructure.GPIO_OType = GPIO_OTYPE_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PUPD_NOPULL;
      GPIO_Init( GPIOA , &GPIO_InitStructure);
}

{
      USART_InitPara USART_InitStructure;

      USART_DeInit( USART1 );

      USART_InitStructure.USART_BRR          = 115200;
      USART_InitStructure.USART_WL          = USART_WL_8B;
      USART_InitStructure.USART_STBits          = USART_STBITS_1;
      USART_InitStructure.USART_Parity             = USART_PARITY_RESET;
      USART_InitStructure.USART_HardwareFlowControl = USART_HARDWAREFLOWCONTROL_NONE;
      USART_InitStructure.USART_RxorTx             = USART_RXORTX_RX | USART_RXORTX_TX;
      USART_Init(USART1, &USART_InitStructure);
}

/* USART enable */
USART_Enable(USART1, ENABLE);