求高手帮我看下下面的程序，我的原理是通过单片机产生PWM信号，然后通过调节按键来改变PWM信号的占空比从而实现对电机的调速作用，我现在程序烧到单片机里面了，可是按下按键单片机的PWM输出口的没反应，电机也转不起来，求高手指教！！！
#include
#defineucharunsignedchar
#defineuintunsignedint
sbitopen=P2^0;
sbitclose=P2^1;
sbitswap=P2^2;
sbitsub_speed=P2^3;
sbitadd_speed=P2^4;
sbitPWM1=P3^4;
sbitPWM2=P3^1;
/************************液晶显示*************/
sbitE=P3^7;
sbitRW=P3^6;
sbitRS=P3^5;
sbittest=P3^0;
inttime=0;
inthigh=20;
intperiod=30;
intchange=0;
intflag=0;
intnum_medium=0;
intnum_display=0;
intcount_speed=0;
ucharwword[]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
/*******************延时t毫秒****************/
voiddelay(uchart)
{
uinti;
while(t)
{
/*对于11.0592MHz时钟，延时1ms*/
for(i=0;i -->
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