slavr936b.c

单片机开发资料光盘-双龙-686M.zip

#include <io8515.h>
#define uchar unsigned char
#define uint  unsigned int  
void delay(uint t)
{
 uint i;
 for (i=0;i<t;i++);
}            
void sound_pc0(uint t)
{
 uint i;
   DDRC=0xff;
   PORTC=0xff;
    for (i=0;i<25000/t;i++)
      {
       PORTC^=(1<<0);
       delay(t);
      }
}
void main (void) 
{
 uint dt;
  for( ; ; )
    for(dt=300;dt<2500;dt+=10)
     sound_pc0(dt);
}