用USART2通信问题

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小蘭|

楼主 | 2019-11-22 16:32 | 只看该作者回帖奖励

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通信, usart2, pi, IO, GPIO

用USART1通信有案例，我想用USART2通信试试，修改了一些配置，但是还是不能成功，求帮助，下面是我修改的代码
void USART2_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      /* config USART2 clock */
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
      /* USART2 GPIO config */
      /* Configure USART2 Tx (PA.09) as alternate function push-pull */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);
      /* Configure USART2 Rx (PA.10) as input floating*/
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      /* USART2 mode config */
      USART_InitStructure.USART_BaudRate = 115200;
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      USART_InitStructure.USART_Parity = USART_Parity_No ;
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
      USART_Init(USART2, &USART_InitStructure);


      USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

      USART_Cmd(USART2, ENABLE);
}

int fputc(int ch, FILE *f)
{

            USART_SendData(USART2, (uint8_t) ch);


            while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

            return (ch);
}

主函数：

      USART2_Config();

      NVIC_Configuration();

      printf(&quot;\r\n串口显示 \r\n&quot;);
      printf(&quot;\r\n成功 \r\n&quot;);

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用USART2通信问题

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