mini板子上的串口除了串口1其他怎么用不了

bat0301 · 发表于 2013-5-23 16:59:07

需要使用两个串口，分别试着把串口2的PA2和PA3接到板子上的TR和RX，然后打开时钟，初始化串口，配置引脚，但是就是不行！怎么配置，串口2的寄存器都没变化。串口3也试了，也重映射了，也不行，到底是哪里我没搞清楚呢？

bat0301 · 发表于 2013-5-23 17:03:12

USART_InitStructure.USART_BaudRate = 9600;
  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;

  /* Configure USART2 */
  USART_Init(USART3, &USART_InitStructure);
  USART_Cmd(USART3, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOC, &GPIO_InitStructure);


  /* Configure USART1 Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_FullRemap_USART3, ENABLE);
这是串口3的配置

wobukansanguo · 发表于 2013-5-23 17:05:51

回复【楼主位】bat0301:
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TTL电平？

bat0301 · 发表于 2013-5-23 17:06:27

USART_InitStructure.USART_BaudRate = 9600;
  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;

  /* Configure USART2 */
  USART_Init(USART2, &USART_InitStructure);
  USART_Cmd(USART2, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);


  /* Configure USART1 Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

这是串口2的配置