智能车制作

标题: 求助：初学者求高手检查一下程序吧！xs128的SCI [打印本页]

作者: 急速小子 时间: 2012-8-5 22:34
标题: 求助：初学者求高手检查一下程序吧！xs128的SCI
我让单片机连续发送，电脑串口接收总是错误的，但换个字母，也会换错误的内容，波特率上试了很多，外部晶振用的是16M的，问问做过的各位  哪有错吗？？？？？
求

#include <hidef.h>    /* common defines and macros */
#include "derivative.h"    /* derivative-specific definitions */

void SetSysCLK_16M (void)
{
CLKSEL = 0X00; // disengage PLL to system
PLLCTL_PLLON = 1; // turn on PLL
SYNR = 0x00|0x01;  // VCOFRQ[7:6];SYNDIV[5:0]
                     // fVCO= 2*fOSC*(SYNDIV + 1)/(REFDIV + 1)
                     // fPLL= fVCO/(2 × POSTDIV)
                     // fBUS= fPLL/2
                     // VCOCLK Frequency Ranges  VCOFRQ[7:6]
                     // 32MHz <= fVCO <= 48MHz 00
                     // 48MHz <  fVCO <= 80MHz 01
                     // Reserved                10
                     // 80MHz <  fVCO <= 120MHz 11
REFDV = 0x80|0x01;  // REFFRQ[7:6];REFDIV[5:0]
                     // fREF=fOSC/(REFDIV + 1)
                     // REFCLK Frequency Ranges  REFFRQ[7:6]
                     // 1MHz <= fREF <=  2MHz    00
                     // 2MHz <  fREF <=  6MHz    01
                     // 6MHz <  fREF <= 12MHz    10
                     // fREF >  12MHz             11
                     // pllclock=2*osc*(1+SYNR)/(1+REFDV)=32MHz;
POSTDIV = 0x00;    // 4:0, fPLL= fVCO/(2xPOSTDIV)
                     // If POSTDIV = $00 then fPLL is identical to fVCO (divide
by one).
_asm (nop);       // BUS CLOCK=16M
_asm (nop);
while (!(CRGFLG_LOCK == 1)); // when pll is steady ,then use it;
CLKSEL_PLLSEL = 1;       // engage PLL to system;
}
/**********延时*********/
void Delay(unsigned int i)
{
unsigned int k,j;
for(j=0;j<i;j++)
{
  for(k=0;k<1000;k++);
}
}
/********SCI串口初始化********/
void SCIInit(void)
{
SCI0BDH=0x00;
  SCI0BDL=0x68;             //16M 9600波特率设置 104=16000000/（9600*16）
SCI0CR1=0;
SCI0CR2=0x0C;       //没有使用中断
}
/***********发送函数*********/
void SCIWrite(unsigned char data_0)
{
while(!SCI0SR1_TDRE);
SCI0DRH=0;
SCI0DRL=data_0;
}
/******接收函数，返回接收值*******/
unsigned char  SCIRend(void)
{
if(SCI0SR1_RDRF==1)
{
  SCI0SR1_RDRF=1;
  return SCI0DRL;
  }
}

void main(void) {
  /* put your own code here */

  unsigned char data='A';
SetSysCLK_16M ();
  SCIInit();
  SCIWrite(data);
  Delay(100);
  SCIWrite(data);
  Delay(1);

  for(;;)
{

SCIWrite(data);
Delay(1000);       //试一下SCIWrite(SCIRend());
}
  EnableInterrupts;

  for(;;) {
_FEED_COP(); /* feeds the dog */
      }
         /* loop forever */
  /* please make sure that you never leave main */

}

作者: 有-木-友 时间: 2012-8-5 22:40
帮顶的！！！

作者: 0726silence 时间: 2012-8-5 23:22