51单片机 矩阵按键 简单容易理解 程序

#includetypedef unsigned char u8; typedef unsigned int u16; #define key P1 int i,t,a; u8 code wei=0x00,0x04,0x08,0x0c,0x10,0x14,0x18,0x1c; u8 code smg16=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71; u8 anjian; void delay(u8 i) while(i-); void v() key=0x0f; if(key!=0x0f) delay(10000); if(key!=0x0f) key=0x0f; switch(key) case 0x07:anjian=0;break; case 0x0b:anjian=1;break; case 0x0d:anjian=2;break; case 0x0e:anjian=3;break; key=0xf0; switch(key) case 0x70:anjian=anjian;break;case 0xb0:anjian=anjian+4;break;case 0xd0:anjian=anjian+8;break;case 0xe0:anjian=anjian+12;break; while(a<50a+; void main() while(1)v();P2=wei0;P0=smganjian;delay(1000);P2=0x00;