51单片机--LCD显示矩阵键盘代码

#include <reg52.h> #define uchar unsigned char #define uint unsigned int uchar code smg_dm[]="0123456789ABCDEFG"; void Lcd_Init(); void Write_Dat(uchar dd); void Write_Cmd(uchar dd); sbit c_rs=P2^0; sbit c_rw=P2^1; sbit c_e=P2^2; uint i=0; void Delay(uint tt) { while(tt--); } delay_50us(uint t) { uchar j; for(; t>0;t--) for(j=19;j>0;j--); } void main() { uchar key_l,key_h,key; P3=0xf0; key_l=key_l&0xf0; if(key_l!=0xf0) { delay_50us(100);//消抖 if(key_l!=0xf0) { key_l=P3&0xf0; key_l=key_l|0x0f; P3=key_l; key_h=P3; key_h=key_h&0x0f; key_l=key_l&0xf0; key=key_l+key_h; } } switch (key) { case 0xee: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00+i); Write_Dat(smg_dm[1]); break; case 0xde: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[2]); break; case 0xbe: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[3]); break; case 0x7e:Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[4]); break; case 0xed: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[5]); break; case 0xdd: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[6]); break; case 0xbd: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[7]); break; case 0x7d: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[8]); break; case 0xeb:Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[9]); break; case 0xdb: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[10]); break; case 0xbb: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[11]); break; case 0x7b: Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[12]); break; case 0xe7:Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[13]); break; case 0xd7:Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[14]); break; case 0xb7:Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[15]); break; case 0x77:Lcd_Init(); //初始化 Write_Cmd(0x80+0x00); Write_Dat(smg_dm[16]); break; } } void Write_Cmd(uchar dd) { c_rs=0; c_rw=0; c_e=0; Delay(50); P1=dd; c_e=1; Delay(50); c_e=0; Delay(50); } void Write_Dat(uchar dd) { c_rs=1; c_rw=0; c_e=0; Delay(50); P1=dd; c_e=1; Delay(50); c_e=0; Delay(50); } void Lcd_Init() { Delay(200); Write_Cmd(0x38); Delay(200); Write_Cmd(0x38); Delay(200); Write_Cmd(0x38); Delay(200); Write_Cmd(0x08); Delay(200); Write_Cmd(0x01); Delay(200); Write_Cmd(0x06); Delay(200); Write_Cmd(0x0c); Delay(200); }