pwm-dianji.zip_protues 电机_pwm code

#include<reg52.h> unsigned int a, b; //------------------------------------------ void main() { TMOD = 0x01; //T0定时方式1 TH0 = (65536-50000) / 256; //50ms@12MHz TL0 = (65536-50000) % 256; TR0 = 1; ET0 = 1; EX0 = 1; EX1 = 1; IT0 = 1; IT1 = 1; EA = 1; a = 0; b = 50; while(1); } //------------------------------------------ void time0() interrupt 1 { TL0 = (65536-5000) % 256; TH0 = (65536-5000) / 256; //50ms@12MHz a++; if(a == 100) a = 0; //在这里调整周期. if(a < b) P2 = 0xff; //在这里调整占空比. else P2 = 0x00; P0 = ((b / 10) << 4) + b % 10; //显示占空比等级 } //------------------------------------------ void X0_INT() interrupt 0 { b++; if(b > 99) b = 99; //占空比等级最大为19 } //------------------------------------------ void X1_INT() interrupt 2 { b--; if(b < 1) b = 1; //占空比等级最小为1. }