stm8的UART问题

只看该作者 · 2015-11-9 12:03

#include "iostm8s105c6.h"

#include "intrinsics.h"

void UART_Init(void)

{

  UART2_CR1=0x00;

  UART2_CR3=0x00;

  UART2_BRR2=0x00;

  UART2_BRR2=0x0d;

  UART2_CR2=0x24;

}

unsigned char c;

void main()

{

   PB_DDR |= 0xFF;

   PB_CR1 |= 0xFF;

   PB_ODR |= 0xFF;              //LED连接的IO口初始化

   PD_DDR = 0x20;                //TXD设置为OD输出

   PD_CR1 = 0x40;                //RXD设置为上拉输入

   PD_CR2 = 0x00;

   UART_Init();

   asm("rim");

   TIM2_PSCR|=0X01;

   TIM2_ARRH=0X03;

   TIM2_ARRL=0XE8;

   TIM2_CNTRH=0X03;

   TIM2_CNTRL=0XE8;

   TIM2_CR1|=0X8C;

   TIM2_IER|=(1<<0);

   TIM2_CR1|=(1<<0);

   while(1)

   {

   while ((UART2_SR & 0x20)==0x00);//Loop until the UART1 Receive Data Register is not empty

        c  = UART2_DR;

   }

}

#pragma vector=UART2_R_RXNE_vector

__interrupt  void UART2_RX(void)

{

 c = UART2_DR; // 接收到数据了

 while(!UART2_SR_TXE); 

}

#pragma vector=15   //TIM2的外部中断向量号是13，加上两个不可屏蔽中断是15

__interrupt void TIM2_IRQ(void)

{ 

  if(c=='a')

  {

    PB_ODR=0Xfe;

  }

  else

  {

    PB_ODR=0xf1;

  }

  TIM2_SR1&=~(1<<0);

}