test6.c

5402开发板附带的源程序

#include "REG5402.h"
int timer1_over;
int read;


void serialbyte_send(unsigned int byte)
{
   unsigned int i,k,a;

   a=byte&0x00ff;
  
   TXD=TXD_bitclear;
   PRD1=0x1df;
   TCR1=0x02eb;
   for(;timer1_over==0;);
   timer1_over=0;

   for(i=0;i<8;i++)
   {
      k=a&0x0001;
      TXD=(k!=0)?TXD_bitset:TXD_bitclear;
      PRD1=0x1df;
      TCR1=0x02eb;
      for(;timer1_over==0;);
      timer1_over=0;

      a=a>>1;
   }

   TXD=TXD_bitset;
   PRD1=0x1df;   
   TCR1=0x02eb;
   for(;timer1_over==0;);
   timer1_over=0;
}

void cpu_init()
{
   PMST=0x3fa0;      
   SWWSR=0x7fff;
   SWCR=0x0000;
   BSCR=0x0002;
   IMR=0; IFR=IFR;

   SPSA1=0xe;        
   SPSD1=0x3020;     
}

void timer1_init()       /* Sample time */
{
   PRD1=0x1df;      
   TCR1=0x02eb;     
                     
   IMR=IMR|0x0080;
}


main()                         
{
   int i;
   read=0; 
   
   asm(" ssbx intm");
   cpu_init();
   timer1_init(); 
   asm(" rsbx intm");              
    
   for(;;)
   {
      read=(READS&0x00ff); 
      serialbyte_send(read);
      for(i=0;i<8;i++)
      {
         PRD1=0x1df;   
         TCR1=0x02eb;
         for(;timer1_over==0;);
         timer1_over=0;
      }   
   }
}

interrupt void timer1_int()
{
   timer1_over=1; 
   TCR1=0x2db;
}