51单片机,L298N模块,按钮按一下电机快速转5秒然后再慢速转5秒最后停止...答:include<reg51.h> define uchar unsigned char uchar stepd[]={0x01,0x03,0x02,0x06,0x04,0xc0,0x08,0x09};uchar num=0,fx=0;sbit key1=P3^0;sbit key2=P3^1;sbit key3=P3^2;unsigned int fcnt,scnt,ft,st;void t0isr() interrupt 1 { if(ft>0){ TH0=(65536-fcnt)/256;T...