STM32f1不能接收扫描枪发来的串口数据

只看该作者 · 2017-10-13 08:48

我想要用扫描枪扫描数据把数据发给STM32F1，但是现在STM32芯片我用示波器能看到RX管脚有数据来，不能进入中断。不知道哪里出了问题，希望有熟悉的帮我看看下面是串口初始化程序：

void Usart1_init(uint32_t pclk,uint32_t bound)
{
float temp;
uint16_t mantissa,fraction;
/*---------------------------------------------*/
temp = (float)(pclk*1000000)/(bound*16);
mantissa  = temp;
fraction  = (temp-mantissa)*16;
mantissa<<= 4;
mantissa += fraction;
/*---------------------------------------------*/
RCC->APB2ENR  |= 1u<<14;
RCC->APB2ENR|=1<<14;  //Ê¹ÄÜ´®¿ÚÊ±ÖÓ
RCC->APB2RSTR |= 1u<<14;
RCC->APB2RSTR &= ~(1u<<14);
/*---------------------------------------------*/
USART1->BRR  = mantissa;
USART1->CR1  = 0x200c;
USART1->CR2  = 0x00;
USART1->CR3  = 0x00;
/*---------------------------------------------*/
//USART1->CR1 |= 1u<<8;
USART1->CR1 |= 1u<<5;
/*---------------------------------------------*/
NVIC->IP[37]  =  0x70;
NVIC->ISER[1] = (uint32_t)0x01<<5;
// NVIC->ICER[1] = (uint32_t)0x01<<5;
}

下面是中断程序：
void USART1_IRQHandler(void)
{
volatile uint8_t revdata;
/*---------------------------------------------*/
revdata = USART1->SR;
revdata = USART1->DR;
//USART1->SR = 0;
if(USART1->SR&(1<<5))
{
   if(SMQ_flag==1)
      {
      SMQReceive(revdata);
      }
      else
   {
            YtReceive(revdata);
      }
}
}

或者有什么思路给我提点一下，我之前没做过这个。都是修改别人的程序不知道从哪里着手