uarta.c

F206中通过8251外扩串口程序 已调试通过

/*cjk-dsp-2003-5-10*/  

#include <stdio.h>   
#include <stdlib.h>                                 

#include <math.h>
/*#include <limits.h>*/
#include <float.h>

asm("pmst    .set   0ffe4h ");      
asm("icr     .set   0ffech ");
asm("wsgr    .set   0fffch "); 
asm("sdtr    .set   0fff0h ");
asm("sspcr   .set   0fff1h  ");
asm("adtr    .set   0fff4h");
asm("aspcr   .set   0fff5h");
asm("iosr    .set   0fff6h");
asm("brd     .set   0fff7h");
asm("tcr  .set 0fff8h");
asm("prd  .set 0fff9h");
asm("tim  .set 0fffah");

asm("ifr     .set   0006h");
asm("imr     .set   0004h"); 
asm("greg    .set   0005h"); 
asm("cr8251  .set   8001h");
asm("dr8251  .set   8000h");                   

unsigned char counter[9],rend=0,send=0,wang_flag;        
int t8251[10], innum[10];

void CouRead();
void tranini();
                        
void CounterInit()
{ int i;
   for(i=0;i<=1;i++)
  asm(" ldp  #0h");
  asm(" splk #34h,60h");       //初始化定时器
  asm(" splk #00h,61h");
  asm(" splk #74h,62h");
  asm(" splk #0b4h,63h");
  
  asm(" out  60h,0103h");
  asm(" out  61h,0100h");
  asm(" out  61h,0100h");
  
  
  asm(" out  62h,0103h");
  asm(" out  61h,0101h");
  asm(" out  61h,0101h");
  
  
  asm(" out  63h,0103h");
  asm(" out  61h,0102h");
  asm(" out  61h,0102h");   
  
  asm(" out  60h,0203h");
  asm(" out  61h,0200h");
  asm(" out  61h,0200h"); 
  for(i=0;i<=1;i++);
} 


main()
 {         
  int i,k,aflg=0;      
   
    for (i=0;i<9;i++) t8251[i]=i;     
    
  asm(" setc intm "); 
  asm(" clrc cnf");
  asm(" setc xf");
  asm(" LDP  #0H ");
  asm(" nop");  
  asm(" SPLK  #04H,60H");
  asm(" NOP");
  asm(" OUT   60H,pmst");
  asm(" splk  #0e40h,64h");        
  asm(" nop");
  asm(" out  64h,wsgr"); 
  asm(" splk  #0000h,63h");
  asm(" nop");
  asm(" out  63h,greg");
  
  asm(" splk #0000h,60h");
  asm(" out  60h,sspcr");
  
  asm(" splk #082fh,63h");    //定时器
                                       
  asm(" nop");
  asm(" out  63h,tcr  ");
  
  asm(" splk #0efffh,62h");
  asm(" nop");
  asm(" out  62h,prd  "); 
  

  asm(" ldp  #0h");
  asm(" nop");
  
/*asm(" splk #0c100h,61h");*/
  asm(" splk #0c080h,61h"); 
  asm(" out  61h,aspcr");
  asm(" splk #0fffh,62h");
  asm(" out  62h,iosr"); 
  
  asm(" splk #0104h,63h");
  asm(" out  63h,brd  ");
  
 /*asm(" splk #0e100h,61h");*/
  asm(" splk #0e080h,61h"); 
  asm(" out  61h,aspcr");     //复位异步串口 
    
  /*asm(" mar *,ar3");	                
  asm(" lar ar3, #(_t8251)");
  asm(" mar *+");
  asm(" sar ar3,76h");*/       //要发送的字符串的首地址
  /*asm("  clrc xf");*/        


for (i=0;i<=20000;i++) {   asm(" nop");}
  asm(" LDP  #0H ");  
  asm(" splk #00AAh,61h");       //空操作
asm(" out  61h,cr8251");  

for (i=0;i<=20;i++) {   asm(" nop");}        
  /* asm(" out  61h,cr8251"); 
  
  asm(" out  61h,cr8251");  */ 
     asm(" nop");
  asm(" splk #0050h,61h");       //复位
  asm(" out  61h,cr8251");     
  for (i=0;i<=20;i++) {   asm(" nop");}
  
  asm(" splk #004eh,61h");
  asm(" out  61h,cr8251");    //设置8251方式控制字
  for (i=0;i<=20;i++) {   asm(" nop");}
  asm(" LDP  #0H ");
  asm(" splk #0014h,62h");
  asm(" out  62h,cr8251");    //设置8251命令控制字   
  for (i=0;i<=20;i++) {   asm(" nop");}
  
  asm(" SPLK #003FH,ifr");    //写1清除所有待决的中断  
  
  asm(" SPLK #0026H,imr");    //开读fifo中断 
  
  asm(" splk #001Dh,60h");
  asm(" nop");
  asm(" out 60h,icr");  
  
  asm("  clrc intm   ");      //打开总中断
  /*asm("  in   60h,dr8251");*/
 /*CounterInit();                                   */                 
 
 asm(" clrc xf"); 
 
   asm(" splk #000ah,61h");  /*接收10个数 */   
  asm(" splk #0009h,64h");  /*发送10个数 */  
  asm(" splk #0070h,6fh");  /*6f记录接收地址*/  
  
  asm(" splk #(_innum) ,6eh");/*6e记录 数组 接收地址*/
  
   asm(" mar *,ar3");
   asm(" lar ar3,#(_t8251)"); 
    asm(" mar *+");
  asm(" sar ar3,6dh");/*6d记录 数组 发送地址*/ 
  

  /*asm(" splk #0047h,62h");      
       asm("  out  62h,dr8251");  */
   asm(" splk #0070h,6fh");  /*6f记录接收地址*/


  for (i=0;i<10;i++) {t8251[i]=0; innum[i]=0;} 
        
  asm(" splk #(_t8251) ,6ch");/*6d记录 数组 发送地址*/ 
   
  wang_flag=0;  
     
 while(1){        
   

    if (innum[9]==0x19 ){  
    asm(" splk #(_innum) ,6eh") ;
   /*CouRead();  //读 8253   */                                 
    for (i=0;i<10;i++) t8251[i]=innum[i]+2;
          for (i=0;i<40;i++) ;
    tranini();   
    wang_flag=1; 
    innum[9]=0x00;
    }  
   
         
    
   for(i=0;i<=20;i++) {}  ;
      

 }
}