PicForum

Hi there,

I am trying to inject a 5v signal from a pic12f683, into a pic18f2220, into RBO(INT0). Once the Pic12f683 is switched on the applied 5v should raise the INT0 interrupt flag, go into the high ISR, then go into "LIGHT_PATTERN" turning on an LED. This works when I use the MPLAB simulator, and manually set the interrupt flag in the Main program loop.

I have tried using VCC and a 1000ohm pullup resistor but the LED does not turn on.

I added MOVLW 0x0F
MOVWF ADCON1 to make it digital

Here is the code
Thank you for your assistance

Code: Select all

#include "p18f2220.inc"
 
  CONFIG  OSC = INTIO2          ; Oscillator Selection bits (Internal RC oscillator, port function on RA6 and port function on RA7)
  CONFIG  FSCM = OFF            ; Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
  CONFIG  IESO = OFF            ; Internal/External Switchover bit (Internal/External Switchover mode disabled)
  CONFIG  PWRT = OFF            ; Power-up Timer enable bit (PWRT disabled)
  CONFIG  BOR = OFF             ; Brown-out Reset enable bit (Brown-out Reset disabled)
  CONFIG  BORV = 20             ; Brown-out Reset Voltage bits (VBOR set to 2.0V)
  CONFIG  WDT = OFF             ; Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
  CONFIG  WDTPS = 32768         ; Watchdog Timer Postscale Select bits (1:32768)
  CONFIG  CCP2MX = ON           ; CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
    CONFIG  MCLRE = OFF           ; MCLR Pin Enable bit (MCLR disabled; RE3 input is enabled in 40-pin devices only (PIC18F4X20))
  CONFIG  STVR = ON             ; Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
  CONFIG  LVP = ON             ; Single-Supply ICSP Enable bit (Single-Supply ICSP enabled)
  CONFIG  CP0 = OFF             ; Code Protection bit (Block 0 (000200-0007FFh) not code-protected)
  CONFIG  CP1 = OFF             ; Code Protection bit (Block 1 (000800-000FFFh) not code-protected)
  CONFIG  CPB = OFF             ; Boot Block Code Protection bit (Boot block (000000-0001FFh) is not code-protected)
  CONFIG  CPD = OFF             ; Data EEPROM Code Protection bit (Data EEPROM is not code-protected)
  CONFIG  WRT0 = OFF            ; Write Protection bit (Block 0 (000200-0007FFh) not write-protected)
  CONFIG  WRT1 = OFF            ; Write Protection bit (Block 1 (000800-000FFFh) not write-protected)
  CONFIG  WRTC = OFF            ; Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) are not write-protected)
  CONFIG  WRTB = OFF            ; Boot Block Write Protection bit (Boot block (000000-0001FFh) is not write-protected)
  CONFIG  WRTD = OFF            ; Data EEPROM Write Protection bit (Data EEPROM is not write-protected)
  CONFIG  EBTR0 = OFF           ; Table Read Protection bit (Block 0 (000200-0007FFh) not protected from table reads executed in other blocks)
  CONFIG  EBTR1 = OFF           ; Table Read Protection bit (Block 1 (000800-000FFFh) not protected from table reads executed in other blocks)
  CONFIG  EBTRB = OFF           ; Boot Block Table Read Protection bit (Boot block (000000-0001FFh) is not protected from table reads executed in other blocks)
 
   RADIX HEX
   CBLOCK 0X0    ;DEFINE REGISTERS REQUIRED
       BIGDELAYCTR
       DELAYCTR
       TESTREG1
       ENDC
   
 ORG 0X00 ; RESET VECTOR
   GOTO START
   ORG 0X08 ; HIGH PRIORITY INTERRUPT VECTOR
     GOTO TMR_ISRHIGH
   ORG 0X18 ; LOW PRIORITY INTERRUPT VECTOR
     GOTO TMR_ISRLOW
   
START
   
MOVLW B'00000000'
    MOVWF TRISA
    MOVWF LATA
    MOVWF TRISC
    MOVWF LATC
MOVLW B'00000001'   ;PORT C   
     MOVWF TRISB
     MOVLW B'00000000'
     MOVWF LATB
    MOVLW 0x0F
    MOVWF ADCON1
   CLRF INTCON,0
   CLRF INTCON2,0
   CLRF INTCON3,0
   BCF TESTREG1,0,1
   
   ;BSF INTCON2,RBPU; PORTB pull-up enable bit
   BSF INTCON,INT0IE,A
   BSF INTCON2,INTEDG0,0
   BCF INTCON,INT0IF,0
   BSF INTCON,GIE,A 
   
MAIN_LOOP
       BRA MAIN_LOOP
       BCF TESTREG1,0,1
    BRA MAIN_LOOP
   
LIGHT_PATTERN
       MOVLW B'00000001'
       MOVWF LATA
          CALL BIGDELAY
          CALL BIGDELAY
       MOVLW B'00000000'
       MOVWF LATA
       BRA BIGDELAY
       BRA BIGDELAY
       BCF INTCON,INT0IF,0   
       RETFIE FAST
   TMR_ISRHIGH  ;HIGH INT SERVICE ROUTINE 
       MOVF PORTB,0,A
       BRA LIGHT_PATTERN
       BCF INTCON,INT0IF,0   
    RETFIE FAST
 
TMR_ISRLOW  ;LOW INT SERVICE ROUTINE 
 
      RETFIE FAST   
BIGDELAY
         MOVLW    .50; ORIGINALLY .255
         MOVWF    BIGDELAYCTR,0
OUTERDELAY
         MOVLW    .50; ORIGINALLY .255
         MOVWF    DELAYCTR,0
INNERDELAY
         DECFSZ   DELAYCTR,1,0
         GOTO     INNERDELAY
         DECFSZ   BIGDELAYCTR,1,0
         GOTO     OUTERDELAY
         RETURN
       
 END

Comes from https://www.microchip.com/forums/m1105035.aspx

As I suggested there, try testing the input directly without using interrupts first.
If you can't see the input change via polling, then the interrupt won't work either.