PIC external interrupt RB0/INT test

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RB0 of PORTB can be used as an external interrupt signal input, and can generate an interrupt response to the rising or falling edge transition of the input signal.

To implement the RB0/INT interrupt source, the software initialization setting steps are as follows:

1, RB0/INT pin is in input mode, TRISB0 = 1;

2, INTEDG = 1, the rising edge of the input signal on RB0 generates an interrupt; INTEDG = 0, the falling edge interrupt

3. Clear INTF = 0 and make sure the interrupt flag is 0 before a valid interrupt occurs;

4, INTE = 1, enable RB0/INT interrupt response.

5. GIE = ​​1, turn on the general interrupt enable

6. After the interrupt occurs, query the INTF bit;

7. If INTF = 1, there is an interrupt. After processing, the software must clear the INTF interrupt flag.

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#include  
#include "../head/config.h"

__CONFIG(HS&WDTDIS&LVPDIS&PWRTEN);    
//HS oscillation, disable watchdog, low voltage programming off, start delay timer

void delay1ms(uint DelayTime);

void main(void) 
{ 
    TRISB = 0x01; 
    INTEDG = 0; 
    INTF = 0; 
    INTE = 1; 
    GIE = 1; 
    PORTD = 0xff; 
    TRISD = 0x00; 
    while(1){} 
}

void interrupt ISR(void) 
{ 
    if(INTF == 1) 
    { 
        INTF = 0; 
        delay1ms(20); 
        if(RB0 == 0) 
        { 
        PORTD = ~PORTD; 
        } 
    } 
}

void delay1ms(uint DelayTime) 
{    uint temp; 
    for(;DelayTime>0;DelayTime--) 
    {    for(temp=0;temp<270;temp++) 
        {;} 
    } 
}