关于F103 串口3 TTL通讯问题

Z00YYQ · 发表于 2019-12-19 09:03:43

使用STM32F103C8T6串口3通讯，TTL方式，发送数据正常，接收只能接受到一个字节，最后一字，有没有遇到过得，谢谢了
//串口3中断服务程序    485
void Uart3_Init(u32 bound)
{
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);

//USART1_TX
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //
  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
  //USART1_RX
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;//
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化

//Usart1 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //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_IDLE, ENABLE);//开启串口空闲中断
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启串口接受中断
  USART_Cmd(USART3, ENABLE);                   //使能串口3
USART_ClearFlag(USART3,USART_FLAG_TC);
}

void USART3_IRQHandler(void)
{
u8 Clear=Clear;//消除编译器没有用到提醒
if(USART_GetITStatus(USART3,USART_IT_RXNE)!=RESET)//接收到1个字节
{
   aRxBuffer3[RxCounter3++]=USART3->DR;
}
else if(USART_GetITStatus(USART3, USART_IT_IDLE) != RESET)//接收到1帧数据
{
   Clear=USART3->SR;
   Clear=USART3->DR;

RxCounter3=0;
}

}