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Hot!New to XC8, can't get interrupt

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mpgmike
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2019/04/21 20:52:19 (permalink)
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New to XC8, can't get interrupt

I've been using ME Labs PBP3 Basic for about 8 years.  I decided it's about time to learn the industry-standard C programming language.  The opportunity showed itself when I fell madly in love with the new PIC16F18426, which PBP does not yet support.  I've played with ASM for some simpler things, but I decided to do the next project in XC8.
 
With that said, I'm having some new-bie issues.  Below is my main.c (there are no additional headers etc as I'm not there yet).  I originally set out to use CLC in 1-Input D Flip/Flop mode (code commented out).  Next I decided to work a bit harder and use IOC.  I also tried using INTF.  I can't seem to get the Interrupt Service Routine to activate.  I used simulator (with PICkit3 and IDC4) to monitor as many SFRs as I thought applicable, still to no avail.
 
Specs: MPLABX 5.15, XC8 2.05, C-99 (default settings).
 
I'm asking for someone to point out what should be quite obvious to any veteran, why am I not getting my interrupt to trigger?!?

/*
* File: SmEngDriverTest3.c
* Author: Mike Holler
* Ecoceptor, LLC
* Created on April 21, 2019, 3:10 AM
*/
#include <xc.h>
//#include <stdio.h> //Print type commands for UART
#define _XTAL_FREQ 32000000
// CONFIG1
#pragma config FEXTOSC = OFF // External Oscillator mode selection bits (Oscillator not enabled)
#pragma config RSTOSC = HFINT32 // Power-up default value for COSC bits (HFINTOSC with OSCFRQ= 32 MHz and CDIV = 1:1)
#pragma config CLKOUTEN = ON // Clock Out Enable bit (CLKOUT function is enabled; FOSC/4 clock appears at OSC2)
#pragma config CSWEN = ON // Clock Switch Enable bit (Writing to NOSC and NDIV is allowed)
#pragma config FCMEN = ON // Fail-Safe Clock Monitor Enable bit (FSCM timer enabled)
// CONFIG2
#pragma config MCLRE = ON // Master Clear Enable bit (MCLR pin is Master Clear function)
#pragma config PWRTS = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config LPBOREN = OFF // Low-Power BOR enable bit (ULPBOR disabled)
#pragma config BOREN = ON // Brown-out reset enable bits (Brown-out Reset Enabled, SBOREN bit is ignored)
#pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (VBOR) set to 2.45V)
#pragma config ZCDDIS = OFF // Zero-cross detect disable (Zero-cross detect circuit is disabled at POR.)
#pragma config PPS1WAY = OFF // Peripheral Pin Select one-way control (The PPSLOCK bit can be set and cleared repeatedly by software)
#pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable bit (Stack Overflow or Underflow will cause a reset)
// CONFIG3
#pragma config WDTCPS = WDTCPS_31// WDT Period Select bits (Divider ratio 1:65536; software control of WDTPS)
#pragma config WDTE = OFF // WDT operating mode (WDT Disabled, SWDTEN is ignored)
#pragma config WDTCWS = WDTCWS_7// WDT Window Select bits (window always open (100%); software control; keyed access not required)
#pragma config WDTCCS = LFINTOSC// WDT input clock selector (WDT reference clock is the 31.0kHz LFINTOSC output)
// CONFIG4
#pragma config BBSIZE = BB512 // Boot Block Size Selection bits (512 words boot block size)
#pragma config BBEN = OFF // Boot Block Enable bit (Boot Block disabled)
#pragma config SAFEN = OFF // SAF Enable bit (SAF disabled)
#pragma config WRTAPP = OFF // Application Block Write Protection bit (Application Block not write protected)
#pragma config WRTB = OFF // Boot Block Write Protection bit (Boot Block not write protected)
#pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration Register not write protected)
#pragma config WRTD = OFF // Data EEPROM write protection bit (Data EEPROM NOT write protected)
#pragma config WRTSAF = OFF // Storage Area Flash Write Protection bit (SAF not write protected)
#pragma config LVP = OFF // Low Voltage Programming Enable bit (High Voltage on MCLR/Vpp must be used for programming)
// CONFIG5
#pragma config CP = OFF // UserNVM Program memory code protection bit (UserNVM code protection disabled)
struct { //To be used in later additions
unsigned CPS : 1;
unsigned RA : 1;
// unsigned NexFlag : 1;
// unsigned Time : 1;
// unsigned Cmp : 1;
} Work;
//void __interrupt_isr(void); //Prototype
void InitMain(void) { //Initiates SFRs
// --- *** Special Function Registers: *** ---
// -=- Oscillator Related SFRs: -=-
OSCCON1 = 0x10; //HFINTOSC + 2X PLL, 1:1 DIV
//OSCSTAT.6 = HFOR
OSCEN = 0x74; //HFINTOSC, MFINTOSC, LFINTOSC, ADOEN
OSCFRQ = 0x05; //32 MHz
// -=- PORT Related SFRs: -=-
//RA0 = ICSP_DAT
//RA1 = ICSP_CLK
//RA2 = NC
//RA3 = !MCLR/Vpp
//RA4 = CLKOUT (For testing)
//RA5 = OUTPUT (CLC1 or LATA5)
//RC0 = NC
//RC1 = Digital Input for later use
//RC2 = Analog Input for later use
//RC3 = Trigger Input for INT/IOCCN
//RC4 = UART TX for later use
//RC5 = UART RX for later use
TRISA = 0x1A; //0b00011010
TRISC = 0x2E; //0b00101110
ANSELA = 0x00;
ANSELC = 0x04; //0b00000100, RC3 Analog
IOCCN = 0x08; //RC3 Negative
// -=- PPS Related SFRs: -=-
// PPSLOCK = 0x55; //PPS Unlock Sequence
// PPSLOCK = 0xAA;
// PPSLOCKbits.PPSLOCKED = 0;
// //RA5PPS = 0x01; //CLC1OUT
// INTPPS = 0x13; //INT on RC3
// PPSLOCK = 0x55; //PPS Lock Sequence
// PPSLOCK = 0xAA;
// PPSLOCKbits.PPSLOCKED = 1;
// -=- CLC1 Related SFRs, Used to Toggle Input -=-
//Taken directly from DS41631B "CLC Tips", Tip 3: 1-Input D Flip/FLop
// CLC1CON = 0x04;
// CLC1POL = 0;
// CLC1GLS0 = 0xA0;
// CLC1GLS1 = 0x10;
// CLC1GLS2 = 0x00;
// CLC1GLS3 = 0x80;
// CLC1SEL0 = 0x00; //CLC1OUT
// CLC1SEL1 = 0x20; //CLC1IN0
while(OSCSTATbits.HFOR == 0); //Wait for HFINTOSC to stabilize
INTCON = 0x40; //Enable PIE
//PIR0bits.INTF = 0; //Tested INT Interrupt
//PIE0bits.INTE = 1;
IOCCF = 0;
PIE0bits.IOCIE = 1; //Enable IOC Interrupt
INTCONbits.GIE = 1; //Enable Global Interrupts
LATAbits.LATA5 = 0; //Start with Output LOW
}
void main(void) { //Main Routine
InitMain(); //Set SFRs & Enable Interrupts
while(1) { //Do the Forever Dance
// LATAbits.LATA5 = PORTCbits.RC3; //Test if Input & Output works
}
return;
}
void __interrupt_isr(void) { //Interrupt Service Routine
IOCCFbits.IOCCF3 = 0; //Clear IOCCF
//PIR0bits.INTF = 0; //Clear INTIF
if(LATAbits.LATA5 == 1) { //Toggle LATA.5
LATAbits.LATA5 = 0;
}
else if(LATAbits.LATA5 == 0) {
LATAbits.LATA5 = 1;
}
} //RETFIE

#1

14 Replies Related Threads

    AMPS
    Super Member
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    Re: New to XC8, can't get interrupt 2019/04/21 21:13:02 (permalink)
    0
    Here i have attached sample code. Can you test it out.
    I used MCC code configuration setting are made as per image attached.
    /**
      Generated Main Source File

      Company:
        Microchip Technology Inc.

      File Name:
        main.c

      Summary:
        This is the main file generated using PIC10 / PIC12 / PIC16 / PIC18 MCUs

      Description:
        This header file provides implementations for driver APIs for all modules selected in the GUI.
        Generation Information :
            Product Revision : PIC10 / PIC12 / PIC16 / PIC18 MCUs - 1.76
            Device : PIC16F18426
            Driver Version : 2.00
    */

    /*
        (c) 2018 Microchip Technology Inc. and its subsidiaries.
        
        Subject to your compliance with these terms, you may use Microchip software and any
        derivatives exclusively with Microchip products. It is your responsibility to comply with third party
        license terms applicable to your use of third party software (including open source software) that
        may accompany Microchip software.
        
        THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
        EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY
        IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS
        FOR A PARTICULAR PURPOSE.
        
        IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
        INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
        WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP
        HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO
        THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL
        CLAIMS IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT
        OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS
        SOFTWARE.
    */

    #include "mcc_generated_files/mcc.h"

    #define LED1 RC1


    void Timer0_Call()
    {
        if(PIR0bits.TMR0IF ==1)
        {
            PIR0bits.TMR0IF = 0;
            LED_Toggle();
            LED1=~LED1;
        }
        
    }


    void main(void)
    {
        // initialize the device
        SYSTEM_Initialize();

        // When using interrupts, you need to set the Global and Peripheral Interrupt Enable bits
        // Use the following macros to:

        //Enable the Global Interrupts
        INTERRUPT_GlobalInterruptEnable();

        // Enable the Peripheral Interrupts
        INTERRUPT_PeripheralInterruptEnable();

        // Disable the Global Interrupts
        //INTERRUPT_GlobalInterruptDisable();

        // Disable the Peripheral Interrupts
        //INTERRUPT_PeripheralInterruptDisable();

        while (1)
        {
            // Add your application code
        }
    }
    /**
     End of File
    */

     
    /**
      TMR0 Generated Driver File

      @Company
        Microchip Technology Inc.

      @File Name
        tmr0.c

      @Summary
        This is the generated driver implementation file for the TMR0 driver using PIC10 / PIC12 / PIC16 / PIC18 MCUs

      @Description
        This source file provides APIs for TMR0.
        Generation Information :
            Product Revision : PIC10 / PIC12 / PIC16 / PIC18 MCUs - 1.76
            Device : PIC16F18426
            Driver Version : 3.10
        The generated drivers are tested against the following:
            Compiler : XC8 2.00
            MPLAB : MPLAB X 5.10
    */

    /*
        (c) 2018 Microchip Technology Inc. and its subsidiaries.
        
        Subject to your compliance with these terms, you may use Microchip software and any
        derivatives exclusively with Microchip products. It is your responsibility to comply with third party
        license terms applicable to your use of third party software (including open source software) that
        may accompany Microchip software.
        
        THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
        EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY
        IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS
        FOR A PARTICULAR PURPOSE.
        
        IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
        INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
        WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP
        HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO
        THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL
        CLAIMS IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT
        OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS
        SOFTWARE.
    */

    /**
      Section: Included Files
    */

    #include <xc.h>
    #include "tmr0.h"

    void Timer0_Call();

    /**
      Section: TMR0 APIs
    */

    void (*TMR0_InterruptHandler)(void);

    void TMR0_Initialize(void)
    {
        // Set TMR0 to the options selected in the User Interface

        // T0CS FOSC/4; T0CKPS 1:32; T0ASYNC synchronised;
        T0CON1 = 0x45;

        // TMR0H 249;
        TMR0H = 0xF9;

        // TMR0L 0;
        TMR0L = 0x00;

        // Clear Interrupt flag before enabling the interrupt
        PIR0bits.TMR0IF = 0;

        // Enabling TMR0 interrupt.
        PIE0bits.TMR0IE = 1;

        // Set Default Interrupt Handler
        TMR0_SetInterruptHandler(TMR0_DefaultInterruptHandler);

        // T0OUTPS 1:1; T0EN enabled; T016BIT 8-bit;
        T0CON0 = 0x80;
    }

    void TMR0_StartTimer(void)
    {
        // Start the Timer by writing to TMR0ON bit
        T0CON0bits.T0EN = 1;
    }

    void TMR0_StopTimer(void)
    {
        // Stop the Timer by writing to TMR0ON bit
        T0CON0bits.T0EN = 0;
    }

    uint8_t TMR0_ReadTimer(void)
    {
        uint8_t readVal;

        // read Timer0, low register only
        readVal = TMR0L;

        return readVal;
    }

    void TMR0_WriteTimer(uint8_t timerVal)
    {
        // Write to Timer0 registers, low register only
        TMR0L = timerVal;
     }

    void TMR0_Reload(uint8_t periodVal)
    {
       // Write to Timer0 registers, high register only
       TMR0H = periodVal;
    }

    void TMR0_ISR(void)
    {
        // clear the TMR0 interrupt flag
        //PIR0bits.TMR0IF = 0;
        Timer0_Call();
        if(TMR0_InterruptHandler)
        {
            TMR0_InterruptHandler();
        }

        // add your TMR0 interrupt custom code
    }


    void TMR0_SetInterruptHandler(void (* InterruptHandler)(void)){
        TMR0_InterruptHandler = InterruptHandler;
    }

    void TMR0_DefaultInterruptHandler(void){
        // add your TMR0 interrupt custom code
        // or set custom function using TMR0_SetInterruptHandler()
    }

    /**
      End of File
    */

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    Amps
    *.*.*.*.*.*.*.*.*.*.*.*.*
    #2
    1and0
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    Re: New to XC8, can't get interrupt 2019/04/21 21:17:51 (permalink)
    +2 (2)
    mpgmike
    Specs: MPLABX 5.15, XC8 2.05, C-99 (default settings).

    void __interrupt_isr(void) { //Interrupt Service Routine


    Look up in the XC8 User's Guide for the correct syntax for the interrupt function.
     
    #3
    1and0
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    Re: New to XC8, can't get interrupt 2019/04/21 21:20:55 (permalink)
    0
    ajitnayak87
    Here i have attached sample code. Can you test it out.
    I used MCC code configuration setting are made as per image attached.
     

    That MCC thingy is soooo bloated, and where is the interrupt function?
     
    #4
    qhb
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    Re: New to XC8, can't get interrupt 2019/04/21 23:28:04 (permalink)
    +2 (2)
    mpgmike
    //void __interrupt_isr(void); //Prototype

    Throw away this line. Interrupt services do NOT need prototypes, and this one is bad anyway.
     

    void __interrupt_isr(void) { //Interrupt Service Routine

    As 1and0 already pointed out, this is NOT an interrupt service routine.
    The correct way to do it is documented in
    MPLAB_XC8_C_Compiler_User_Guide_for_PIC.pdf
    section "4.9.1 Writing an Interrupt Service Routine"
    Yes, it does mention a lot of stuff that doesn't apply to PIC16F chips, you have to learn to filter that out.
    Hint. "void interrupt() isr(void)" where the actual name of the function can be anything you like, it is the correct qualifier that matters.
     
     

    Nearly there...
    #5
    mpgmike
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    Re: New to XC8, can't get interrupt 2019/04/22 10:50:10 (permalink)
    0
    qhb
    As 1and0 already pointed out, this is NOT an interrupt service routine.
    The correct way to do it is documented in
    MPLAB_XC8_C_Compiler_User_Guide_for_PIC.pdf
    section "4.9.1 Writing an Interrupt Service Routine"

    It is section 5.9.1 in the version I've been using; DS50002053G, Copyright 2012-2016.  Is there a newer version I should be using?
     
    Got it working with

    void __interrupt() isr(void)

    Although there are many books written on programming PIC processors in C, most are written for MPLAB 8 using the C-89 format.  I found one specifically for XC8, "Programming PIC microcontrollers with XC8", by Armstrong Subero, but uses the XC8 V1.x syntax.  Are there any recommendations outside of the XC8 Compiler's Guide I can reference?  I want to understand this better, but it seems the C programming language is clouded in versions (C-89 vs C-99), include files, header files, commands only working when the proper header file is included, XC8 versus XC16 applications, and so forth.
     
    Thank you all for your knowledge.
    #6
    1and0
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    Re: New to XC8, can't get interrupt 2019/04/22 11:04:20 (permalink)
    +1 (1)
    There are two XC8 User's Guides located in the XC8 install folder. DS50002053x is the legacy guide, and DS50002737x is the newer guide. Syntaxes such as __interrupt() are of XC8 and not generic C.
    #7
    mlp
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    Re: New to XC8, can't get interrupt 2019/04/22 11:42:42 (permalink)
    0
    1and0
    Syntaxes such as __interrupt() are of XC8 and not generic C.

    Actually, the new syntax is more "standard" than the old.
     
    "interrupt" has since 1989 been an identifier reserved for the User, not the Implementer. Every compiler which treated it as anything else (and in this I include all the historical HI-TECH C compilers, and every version of XC8 not using C99-mode) is in this respect non-compliant. The User is explicitly allowed to write
    typedef struct foo { int a; } interrupt;
     
    interrupt x = {5};
     
    interrupt y = {9999};
    and the compiler should be fine with it. Only with C99-mode has XC8 got there.

    Mark (this opinion available for hire)
    #8
    mpgmike
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    Re: New to XC8, can't get interrupt 2019/04/22 11:53:06 (permalink)
    0
    Oh, and I'm about half way through (Lab Exercise 9) the "Fundamentals of C Programming" Tutorial from MicrochipDeveloper.com.  I have to slide learning in with normal work.
    #9
    InvalidApple
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    Re: New to XC8, can't get interrupt 2019/04/29 05:17:36 (permalink)
    0
    mark.pappin
    1and0
    Syntaxes such as __interrupt() are of XC8 and not generic C.

    Actually, the new syntax is more "standard" than the old.
     
    "interrupt" has since 1989 been an identifier reserved for the User, not the Implementer. Every compiler which treated it as anything else (and in this I include all the historical HI-TECH C compilers, and every version of XC8 not using C99-mode) is in this respect non-compliant. The User is explicitly allowed to write
    typedef struct foo { int a; } interrupt;
     
     
     
    interrupt x = {5};
     
     
     
    interrupt y = {9999};
    and the compiler should be fine with it. Only with C99-mode has XC8 got there.


    Just curious, where does it say anything about a type "interrupt" in the standards? 
    #10
    mlp
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    Re: New to XC8, can't get interrupt 2019/04/29 11:56:48 (permalink)
    0
    InvalidApple
    Just curious, where does it say anything about a type "interrupt" in the standards? 

    It doesn't.
    That's my point.
    The sequence of source code characters "interrupt" is left available for the User, who should be able to use them as s/he sees fit.
     
    Edit: I realise you may be asking about my use of the word "explicitly".
    The standard explicitly says that everything not reserved for the Implementer is available to the User.
    post edited by mlp - 2019/04/29 11:58:25

    Mark (this opinion available for hire)
    #11
    AMPS
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    Re: New to XC8, can't get interrupt 2019/04/29 20:00:18 (permalink)
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    @melp.
     
    Have you tested my code , You just config and let me know result.

    Amps
    *.*.*.*.*.*.*.*.*.*.*.*.*
    #12
    qhb
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    Re: New to XC8, can't get interrupt 2019/04/29 20:07:44 (permalink)
    +1 (1)
    ajitnayak87
    @melp.

    Did you mean "mlp" ?
    He is not the original poster, and is unlikely to be bothered testing your "code"
    All you posted are some files generated by MCC, which does NOT include the actual interrupt service,
    so does not help show mpgmike (the OP) what the correct syntax is.
     
     

    Nearly there...
    #13
    mpgmike
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    Re: New to XC8, can't get interrupt 2019/04/30 01:49:02 (permalink)
    +2 (2)
    Got past the Interrupt issue.  Just finished my second project in XC8 (with interrupts).  I'll get it eventually.
    #14
    1and0
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    Re: New to XC8, can't get interrupt 2019/04/30 06:27:42 (permalink)
    0
    qhb
     
    All you posted are some files generated by MCC, which does NOT include the actual interrupt service,
    so does not help show mpgmike (the OP) what the correct syntax is.

    As I've questioned him in Post #4. ;)
     
    #15
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