K1-K4 分组控制LED.rar

#include <reg52.h> #define uchar unsigned char #define uint unsigned int void DelayMS(uint x) { uchar t; while(x--) { for(t=0;t<120;t--); } } void main() { uchar k,t,Key_State; P0 = 0xff; P1 = 0xff; while(1) { t = P1; { DelayMS(10); if(t != P1) continue; Key_State = ~t >> 4; k = 0; while(Key_State != 0) { k++; Key_State >>= 1; } switch(k) { case 1: if(P0 == 0x00) P0 = 0xff; P0 <<= 1; DelayMS(200); break; case 2: P0 = 0xf0; break; case 3: P0 = 0x0f; break; case 4: P0 = 0xff; } } } }