1. Experimental topic:
A three-machine fault detection and indication system is simulated in Proteus, as shown in Figure 2. When there is no fault, LED0 is on; when there is a fault, LED0 is off. When fault 1 (P2.0 is 0), LED1 is on; when fault 2 (P2.1 is 0), LED1 is on; when fault 3 (P2.2 is 0), LED3 is on.
2.KEIL code
#include sbit LED=P1^0; sbit LED1=P1^1; sbit LED2=P1^2; sbit LED3=P1^3; sbit P20=P2^0; sbit P21=P2^1; sbit P22=P2^2; void INT0_Init() //Write interrupt initialization function { EA=1; //Turn on the interrupt master switch EX0=1; // Enable external interrupt 1 IT0=1; //Set to falling edge trigger } void main() { INT0_Heat(); while (1) { if(P20==1&&P21==1&&P22==1) {LED=0;LED1=1;LED2=1;LED3=1;} else LED=1; } } void INT0_Rupt() interrupt 0 //Write external interrupt 0 service function { LED1=P20; LED2=P21; LED3=P22; } 3. Protues simulation diagram When no button is pressed, the LED is on: When button 2 is pressed, LED goes out and LED2 turns on.
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