Application of interrupts and digital tubes - "9999" countdown table
#include unsigned char code LedChar[10]={//Numbers displayed by the digital tube 0~9 0XC0,0XF9,0XA4,0XB0,0X99,0X92,0X82,0XF8,0X80,0X90}; unsigned char LedBuff[4]={//The buffer area displayed by the digital tube 0XFF,0XFF,0XFF,0XFF}; sbit Tube1 = P1^0; sbit Tube2 = P1^1; sbit Tube3 = P1^2; sbit Tube4 = P1^3; unsigned char i = 0; unsigned int cnt = 0; //interrupt times unsigned long sec = 0; //Record the number of seconds that have passed void main() { // Enable T0 interrupt EA = 1; ET0 = 1; //Set T0 TMOD = 0X01; TH0 = 0XFFED; TL0 = 0XFFFF; TR0 = 1; while(1) { if(cnt>500) { cnt = 0; sec++; } LedBuff[0] = LedChar[9-sec%10]; LedBuff[1] = LedChar[9-sec/10%10]; LedBuff[2] = LedChar[9-sec/100%10]; LedBuff[3] = LedChar[9-sec/1000%10]; } } //Timer 0 interrupt service void InterruptTimer() interrupt 1 { TH0 = 0XFFED; TL0 = 0XFFFF; cnt++; switch(i) { case 0: P0 = LedBuff[0];Tube1=0;Tube2=1;Tube3=1;Tube4=1;i++;break; case 1: P0 = LedBuff[1];Tube1=1;Tube2=0;Tube3=1;Tube4=1;i++;break; case 2: P0 = LedBuff[2];Tube1=1;Tube2=1;Tube3=0;Tube4=1;i++;break; case 3: P0 = LedBuff[3];Tube1=1;Tube2=1;Tube3=1;Tube4=0;i=0;break; default:break; } }
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