- #include<reg52.h>
- #define uint unsigned int
- sbit pwm=P1^0;
- uint cycle,high,low;
- void delay(uint t)
- {
- while(t--);
- }
- void main()
- {
- cycle=800;
- while(1)
- {
- for(high=1;high<=cycle;high++)
- {
- pwm=1;
- delay(high);
- low=cycle-high;
- pwm=0;
- delay(low);
- }
- high=1;
- delay(60000);
- }
- }
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