用stc 89C52单片机实现键盘控制28BYJ-48步进电机的启停 加减速,正反转...答:include<reg52.h> define uchar unsigned signed sbit jia_key=P3^6;sbit jian_key=P3^7;sbit zf_key=P3^5;bit flag=0;uchar codetable[]={0x01,0x02,0x04,0x08,0x08,0x04,0x02,0x01};uchar num,qidong,PWM,table_begin;void delay(uchar 1){ uchar j,k;for(j=i;j>0;j--)fo...