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 · 发表于 2014-1-20 20:43:33

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 ??????
}