急！stm32f103c8t uart3

只看该作者 · 2019-5-25 00:05

如题，这两天一直在调试串口，以前也经常用，但是现在的新项目  uart1 ok，uart3已知不工作，请问在103c8t上由什么特别的地方吗
void uart_init(u32 bound){
  //GPIO端口设置
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能USART3，GPIOB时钟
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

//GPIO_PinRemapConfig(GPIO_FullRemap_USART3, ENABLE);
//USART1_TX GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
  GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOA.9

  //USART1_RX    GPIOA.10初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIOA.10

  //Usart1 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

//USART 初始化设置

USART_InitStructure.USART_BaudRate = bound;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式

  USART_Init(USART3, &USART_InitStructure); //初始化串口3
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启串口接受中断
  USART_Cmd(USART3, ENABLE);                   //使能串口3

}