求助!使用103c8串口1和串口2时,遇到问题,大侠帮忙看看!谢谢

oooiou

 Stm32_Clock_Init(9);
 delay_init(72);
 LED_Init();        //LED,????????IO,????????????????,·??ò????????????±????????????¨IO
 
 uart1_init(72,19200);   //????1 19200
 uart2_init(36,19200);   //????2 19200

使用串口1 PA9,10 串口2 PA2,3
 

LED PA4 PA5 PA6 PA7

发现串口1不正常,有时候进不了中断,串口2正常,换了好几块单片机还是这个问题.

求指点谢谢

 

void uart1_init(u32 pclk2,u32 bound)
{   
 float temp;
 u16 mantissa;
 u16 fraction;   
 temp=(float)(pclk2*1000000)/(bound*16);  //????USARTDIV
 mantissa=temp;         //??????????·?
 fraction=(temp-mantissa)*16;     //??????????·? 
    mantissa<<=4;
 mantissa+=fraction;
 RCC->APB2ENR|=1<<2;         //????PORTA???±?? 
  
 RCC->APB2ENR|=1<<14;         //?????????±??
 GPIOA->CRH&=0XFFFFF00F;      //IO×????è??PA9-TX,PA10-RX
 GPIOA->CRH|=0X000008B0;      //IO×????è??,TX-0XB±í??????????,RX-0X8??/???­????
 GPIOA->ODR|=(1<<9)|(1<<10);  
 RCC->APB2RSTR|=1<<14;        //????????5
 RCC->APB2RSTR&=~(1<<14);     //????????5       
 //?¨?????è??
  USART1->BRR=mantissa; // ?¨?????è?? 
 USART1->CR1|=0X200C;  //8n1,?????é??
 //USART1->CR2|=(2<<12);
 //????????????
 USART1->CR1|=1<<8;    //PE????????
 USART1->CR1|=1<<5;    //??????????·???????????      
 //MY_NVIC_Init(0,0,USART1_IRQChannel,2);//????1???ì??1??×é2
 MY_NVIC_Init(0,4,USART1_IRQChannel,0);//????0???ì??1??×é0
} 

void USART1_IRQHandler(void)
{ 
 if(USART1->SR&(1<<5))  //??????????
 { if (UART_timer == 0) com_cnts = 0;
  UART_timer = 20;
  if (com_cnts <= (dlen-1))//??????????12??×??? 50 xx ...
  {
    com_buffer[com_cnts]=USART1->DR;//??DR?????ê????RXNE??????
    com_cnts ++;//????????
  }
  Com_work();  
 }
}

void uart2_init(u32 pclk1,u32 bound)
{   
 float temp;
 u16 mantissa;
 u16 fraction;   
 temp=(float)(pclk1*1000000)/(bound*16);  //????USARTDIV
 mantissa=temp;         //??????????·?
 fraction=(temp-mantissa)*16;     //??????????·? 
    mantissa<<=4;
 mantissa+=fraction;
 RCC->APB2ENR|=(1<<2);        //????PORTAB???±??|(1<<3)     
 RCC->APB1ENR|=1<<17;         //????????2?±??
 GPIOA->CRL&=0XFFFF00FF;      //IO×????è??PA2,3
 GPIOA->CRL|=0X00008B00;      //IO×????è??,0XB±í??????????2-TX;0X8 ±í????/???­????3-RX
 GPIOA->ODR|=(1<<2)|(1<<3);         //???­
   
 RCC->APB1RSTR|=1<<17;        //????????
 RCC->APB1RSTR&=~(1<<17);     //????????       
 //?¨?????è??
  USART2->BRR=mantissa;       //?¨?????è?? 
 USART2->CR1|=0X200C;        //8n1,?????é??
 
 //????????????
 USART2->CR1|=1<<8;          //PE????????
 USART2->CR1|=1<<5;          //??????????·???????????      
 MY_NVIC_Init(0,5,USART2_IRQChannel,0);  //????1???ì??1??×é2
 
}

void USART2_IRQHandler(void)
{ 
 if(USART2->SR&(1<<5))  //??????????
 { 
  if (UART2_timer == 0) com2_cnts = 0;
  UART2_timer = 20;
  if (com2_cnts <= (dlen-1))
  {
    com2_buffer[com2_cnts]=USART2->DR;//??DR?????ê????RXNE??????
    com2_cnts ++;//???????? 
  }
  Com2_work();
 }                    
}

void LED_Init(void)
{
 RCC->APB2ENR|=(1<<2);    //????PORTA?±?? 
     
 GPIOA->CRL&=0X0000ffff;
 GPIOA->CRL|=0X33330000;  //PA1 ???ì????    
    GPIOA->ODR|=(15<<4);     //PA4-7 ??????
  
 GPIOA->CRH&=0XFFF0FFFF;
 GPIOA->CRH|=0X00030000;  //PA12 ???ì????    
    GPIOA->ODR|=(1<<12);     //PA12 ??????            
}

 

 

正点原子

103c8和103RB串口1的使用是一回事。
你下载我们的串口实验，直接测试即可。

oooiou

回复【2楼】正点原子:
---------------------------------谢谢,还没找到原因