Smg_display.rar_SMG_Display_smg display

/******************************************************************** * 本程序为STC89C52控制数码循环显示学号，身份证号的实验 * P2口为位码，P0口为段码 ********************************************************************/ #include <reg52.h> #include <intrins.h> #define STU_END 10 //学号的位数 #define ID_END 18 //身份证位数 //sbit P1_0 = P1^0; //led0 unsigned int cnt = 0; unsigned char index = 0; //数组的索引 unsigned char pos = 0xfe; //the first position to display unsigned char const seg_table[10]={0xC0,0xF9,0xA4,0xB0,0x99 ,0x92,0x82,0xF8,0x80,0x90}; //段码 unsigned char const stu_num[] = {0, 8, 0, 1, 0, 5, 4, 1, 0, 6}; //学号 unsigned char const id_num[] = {2, 1, 1, 4, 0, 2, 1, 9, 9, 0, 0, 5, 2, 5, 1, 6, 2, 2}; //身份证号 unsigned char change_sign = 0; //身份证号与学号改变标志 unsigned char end_sign = 0; //数组的计数 /**************************************************/ /*P0 is segment code, P2 is position code。 /**************************************************/ void main(void) { TMOD = 0x01; TH0 = (65536-1000)/256; TL0 = (65536-1000)%256; // P1_0 = 1; EA = 1; ET0 = 1; TR0 = 1; P2 = 0xff; //close all digital tubes while(1); } void timer0() interrupt 1 using 1 { TH0 = (65536-1000)/256; TL0 = (65536-1000)%256; cnt++; if(cnt == 50) { cnt = 0; //P1_0 = ~P1_0; //led0 display if(change_sign == 0) { P2 = pos; P0 = seg_table[stu_num[index]]; end_sign++; index++; pos = _crol_(pos, 1); if(pos == 0xbf) pos = 0xfe; if(end_sign == STU_END) //student number ends and change the sign for ID number { change_sign = 1; index = 0; pos = 0xfe; end_sign = 0; } } else { P2 = pos; P0 = seg_table[id_num[index]]; end_sign++; index++; pos = _crol_(pos, 1); if(pos == 0xbf) pos = 0xfe; if(end_sign == ID_END) //ID number ends and change the sign for student number { change_sign = 0; index = 0; pos = 0xfe; end_sign = 0; } } } }