智能车制作

标题: MC9S12NE64VTU的串口SCI收发问题 [打印本页]

作者: hsandzy 时间: 2012-7-6 11:46
标题: MC9S12NE64VTU的串口SCI收发问题
以下为我的程序，使用断点可以用485调试助手正确收发，可是全速运行就会收到乱码，请问高手这是什么问题
#include <hidef.h>
#include <mc9s12ne64.h>
uchar data;
//----------PLL初始化----------//
void clockinit(void)
{
CLKSEL_PLLSEL=0;
PLLCTL_PLLON=0;    //turn off PLL
SYNR =0x01;
REFDV=0x01;       //pllclock=2*osc*(1+SYNR)/(1+REFDV)=50MHz,busclk=pllclk/2=25M;
PLLCTL_PLLON=1;    //turn on PLL
_asm(nop);
_asm(nop);
_asm(nop);
_asm(nop);
while(!(CRGFLG_LOCK==1)); //the pll is stable
CLKSEL_PLLSEL =1;          //engage PLL to system;
COPCTL = 0x00;             //disable watchdog
}
//----------串口SCI1初始化----------//
void sciinit(void)
{
SCI1BDL=0xA3; //bus clock is 25M?baud rate is 9600
SCI1BDH=0x00;
SCI1CR1=0x00; //8 bits of data,1 bit of stop
SCI1CR2=0XAC; //admit receive and transmit interrupt,admit receive and transmit
}
//----------IO初始化----------//
void IOinit(void)
{
  DDRG=0XFF;
  PTG=0X00;
}
//----------主函数----------//
void main(void)
{
DisableInterrupts;
clockinit();
sciinit();
IOinit();
PEAR_NECLK=0;
EnableInterrupts;
while(1);
}
//----------SCI1中断响应函数----------//
#pragma CODE_SEG NON_BANKED
interrupt 21 void SCI1_Isr(void)
{
  uchar r;
  r=SCI1SR1;
  //while(!SCI1SR1_RDRF);
  data=SCI1DRL;             //read received character + clear interrupt flag
  PTG=0X40;                //set transceiver chip for transmit
  r=SCI1SR1;
  while(!SCI1SR1_TDRE);    //SC1DR is busy,wait
  SCI1DRL=data;             //set transceiver chip for receive
  PTG=0X00;
}
#pragma CODE_SEG DEFAULT

作者: hsandzy 时间: 2012-7-6 15:45
高手指教啊

作者: zfc 时间: 2012-7-29 19:11
是20号中断还是21号中断啊？

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