Hello I am using PIC18F26K83 and I have a button on RC7 pin. That is why I cannot use a normal interrupt. But according to datasheet interrupt on change can be used in this pin. I could not make it work so I tried to make a code with interrupt on change which was supposed to make the LED light. But the code never enters the interrupt routine. Here is the code:
#define switch PORTC.B7 #define led1 LATB.B0 #define led2 LATB.B1 #define led3 LATB.RB5 int counter; void Clk_8Mhz(){ //8 MHz clock // OSCCON1 REGISTER NOSC2_BIT=1; NOSC1_BIT=1; NOSC0_BIT=0;//HF INTERNAL OSC //OSCFRQ REGISTER HFINTOSC FREQ. SELECTION OSCCON1 =0b01100000; //HFINTOSC, Divider =1; FRQ3_BIT=0; FRQ2_BIT=0; FRQ1_BIT=1; FRQ0_BIT=1; // 0011 :8MHz //0100 = 16 Mhz } void main (){ TRISC.RC7=1; //Button pin is output ANSELC.RC7=0; //Button pin is digital TRISB=0x00; //B port is output. LATB.B=0x00; //All B port is initially zero. //RC7 IOC //Interrupt initialisation INTCON0.B5=0; //Interrupt priority disabled IOCCN7_bit=1; //RC7 pin is negative edge IOCCF=0x00; //Clear the Interrupt on Change Flag PIE0.B7=1; //Interrupt on change enabled INTCON0.B7=1; //Global high priority interrupt enable Clk_8Mhz(); while(1){ delay_ms(10);//Wait for interrupt } } void interrupt(void) { led1=1; led2=1; led3=1; } Probably I am missing something very obvious. Edit: I use Micro C Edit2: I changed to code like above. Still interrupt does not occur unfortunately.
These are 2 images of the schematic, I could not find the whole part but schematic of PIC and switch is in here:
#define switch PORTC.B7) \$\endgroup\$