#include <reg51.h> #include <intrins.h> typedef unsigned char UINT8; typedef unsigned int UINT16; UINT8 num = 0, temp = 0, key = 16, t0 = 0, t1 = 0, shu = 0; /* 数码管编码 */ UINT8 code table[]= { 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71,0x00 }; /* 初始化函数 */ void init() { P1 = 0xf0; /* 初始化定时器 */ TMOD = 0x01; /* 定时器0和定时器1同时设置为16位定时方式 */ TH0 = (65536 - 50000) / 256; // 放在高八位当中 TL0 = (65536 - 50000) % 256; EA = 1; //开总中断 ET0 = 1; //开定时器0中断 TR0 =1; //启动定时器0 } /* 显示函数 */ /* 按键扫描函数 */ UINT8 scan_key() { P1 = 0xef; temp = P1; temp = temp&0xf0; if (temp != 0xf0) { temp = P1; switch(temp) { case 0xee: key=0; break; case 0xed: key=1; break; case 0xeb: key=2; break; case 0xe7: key=3; break; default: break; } P1=0xfe; } P1 = 0xdf; temp = P1; temp = temp&0x0f; if(temp != 0x0f) { temp = P1; switch(temp) { case 0xde: key = 4; break; case 0xdd: key = 5; break; case 0xdb: key = 6; break; case 0xd7: key = 7; break; default: break; } } P1 = 0xbf; temp = P1; temp = temp&0x0f; if(temp != 0x0f) { temp = P1; switch(temp) { case 0xbe: key = 8; break; case 0xbd: key = 9; break; case 0xbb: key = 10; break; case 0xb7: key = 11; break; default: break; } } P1 = 0x7f; temp = P1; temp = temp&0x0f; if(temp != 0x0f) { temp = P1; switch(temp) { case 0x7e: key = 12; break; case 0x7d: key = 13; break; case 0x7b: key = 14; break; case 0x77: key = 15; break; default: break; } } return key; } /* 显示函数 */ void display(unsigned char num) { P0 = table[num]; } /* 定时器0的中断 */ void timer0() interrupt 1 { /* 装初值 */ TH0 = (65536 - 50000) / 256; TL0 = (65536 - 50000) % 256; t0++; display(key); if ( t0 == 1) { t0 = 0; key = scan_key(); P1 = 0x00; } } void main() { init(); while(1) { ; } }
时间: 2024-11-05 17:19:15