STM32F207串口问题

阝东 · 发表于 2018-12-5 10:53:22

使用stm32的串口6发送数据时，串口的DR和SR寄存器没有变化但是TX引脚上却有电平变化，但是发出来的数据也是乱码，接受数据的时候也进不了串口中断，用轮询的方式也一直检测不到SR的寄存器变化
单步调试的时候DR和SR寄存器一直没有变化
int main()
{
USART6_Init();
LED_Initial();
LED=0;
while(1)
{
  USARTx_SendString(USART6,"TTM:MAC-?"); //串口字符串发送
  DelayMs(500);
}
}

void USART6_Init(void)
{
#if 1
GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
//开启RX和TX引脚时钟并配置成对应的模式
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);  //TX初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;          //RX初始化
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
//开启串口6的时钟并做相应配置
USART_DeInit(USART6);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6,ENABLE);
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_USART6);  //将对应的IO口配置成USART6模式
GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_USART6);
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_Tx|USART_Mode_Rx;
USART_Init(USART6, &USART_InitStructure);
//开启串口接收中断
USART_ITConfig(USART6,USART_IT_RXNE,ENABLE);
//配置NVIC寄存器
NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = USART6_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  USART_ITConfig(USART6, USART_IT_RXNE, ENABLE);//!<使能USART1接收中断
//使能串口6
USART_Cmd(USART6, ENABLE);
#endif
}

//串口6中断处理函数
void USART6_IRQHandler(void)
{
USART6->SR&=~(1<<5);  //清除标志位
TIM_Cmd(TIM4, ENABLE);          //使能TIMx外设
TIM4->CNT=0;
USART6_RXBuff[USART6_RXLen]=USART6->DR;
USART6_RXLen++;

Breathe_led(300);
}