18F26K42 TMR1 Interrupt troubles
Hello, I am a first-time caller, long time listener. You folks and this forum have been a wealth of knowledge over the years and I just wanted to say thank you. I currently have a problem that I haven’t been able to crack, I am sure I am missing something but just don’t know what.
I am trying to get a TMR1 overflow interrupt (no vectors, I turned them off, I think) to work on a 18F26K42. I tried using the DT_INTS-18K42b.bas routine by MPGMike but kept getting a compile error, specifically on the SaveFSR (0), (1), and (2) lines. Based on an earlier post I went into the DT_INTS-18K42b.bas file and replaced the “movff”with “movffl” but that didn’t seem to help either. The test code is below:
Code:#CONFIG CONFIG FEXTOSC = OFF CONFIG RSTOSC = HFINTOSC_64MHZ CONFIG CLKOUTEN = OFF CONFIG PR1WAY = OFF CONFIG CSWEN = ON CONFIG FCMEN = OFF CONFIG MCLRE = INTMCLR CONFIG PWRTS = PWRT_OFF CONFIG MVECEN = OFF ;disable vector table CONFIG IVT1WAY = OFF CONFIG LPBOREN = OFF CONFIG BOREN = OFF CONFIG BORV = VBOR_245 CONFIG ZCD = OFF CONFIG PPS1WAY = OFF CONFIG STVREN = OFF CONFIG DEBUG = OFF CONFIG XINST = OFF CONFIG WDTCPS = WDTCPS_31 CONFIG WDTE = OFF CONFIG WDTCWS = WDTCWS_7 CONFIG WDTCCS = LFINTOSC CONFIG BBSIZE = BBSIZE_512 CONFIG BBEN = OFF CONFIG SAFEN = OFF CONFIG WRTAPP = OFF CONFIG WRTB = OFF CONFIG WRTC = OFF CONFIG WRTD = OFF CONFIG WRTSAF = OFF CONFIG LVP = OFF CONFIG CP = OFF #ENDCONFIG 'Defines, Includes, and Constants----------------------------------------------- DEFINE OSC 64 ' Calibrate PBP to 64MHz clock OSCFRQ = 001000 ' Set system clock to 64MHz internal INCLUDE "DT_INTS-18_k42b.bas" ; Base Interrupt System include "ReEnterPBP.bas" ASM INT_LIST macro ; IntSource, Label, Type, ResetFlag? INT_Handler TMR1_INT, _INC_TICK, PBP, YES ENDM INT_CREATE ENDASM 'Direction---------------------------------------------------------------------- TRISA = 000000 TRISB = 000000 TRISC = 000000 'Alias--------------------------------------------------------------------------- LED var PORTA.1 'Variables---------------------------------------------------------------------- 'Initialize Registers---------------------------------------------------------------------- Initialize: ANSELA = 000000 ' Set digital ANSELB = 000000 ' Set digital ANSELC = 000000 ' Set digital ADCON0 = 000000 ' Disable ADC CM1CON0.7 = 0 : CM2CON0.7 = 0 'Disable comparators PMD0=$FF : PMD1=$FF : PMD2=$FF 'Turning off all Peripheral- PMD3=$FF : PMD4=$FF : PMD5=$FF '-Modules, not sure if this is nessesary PMD6=$FF : PMD7 = $FF PMD1.bit1 = 0 'Enable the TMR1 module T1CON = 110000 'Prescale 1:8; Disable the TMR1 T1GCON.bit7 = 0 'Disable gate, TMR1 always counting T1CLK = 000001 'Clock Source Fosc/4 TMR1H = $00 : TMR1L = $00 @ INT_ENABLE TMR1_INT LED = 0 'Code--------------------------------------------------------------------------- Main: pause 1 Goto Main '----- INTERRUPT CODE ------------------- INC_TICK: toggle LED TMR1L = $00 : TMR1H = $00 PIR4.bit0 = 0 @ INT_RETURN '------ END OF INTERRUPTS CODE ----------
Next, I tried the simple old “ON INTERRUPT GOTO” function of PBP3. The code below seems to compile, it just doesn't work. I can confirm that the TMR1H and TMR1L registers increase to 65535 and then wrap around to 0 and increase again, etc. The interrupt just never occurs. I am using an oscilloscope to monitor the LED pin.
Code:#CONFIG CONFIG FEXTOSC = OFF CONFIG RSTOSC = HFINTOSC_64MHZ CONFIG CLKOUTEN = OFF CONFIG PR1WAY = OFF CONFIG CSWEN = ON CONFIG FCMEN = OFF CONFIG MCLRE = INTMCLR CONFIG PWRTS = PWRT_OFF CONFIG MVECEN = OFF CONFIG IVT1WAY = OFF CONFIG LPBOREN = OFF CONFIG BOREN = OFF CONFIG BORV = VBOR_245 CONFIG ZCD = OFF CONFIG PPS1WAY = OFF CONFIG STVREN = OFF CONFIG DEBUG = OFF CONFIG XINST = OFF CONFIG WDTCPS = WDTCPS_31 CONFIG WDTE = OFF CONFIG WDTCWS = WDTCWS_7 CONFIG WDTCCS = LFINTOSC CONFIG BBSIZE = BBSIZE_512 CONFIG BBEN = OFF CONFIG SAFEN = OFF CONFIG WRTAPP = OFF CONFIG WRTB = OFF CONFIG WRTC = OFF CONFIG WRTD = OFF CONFIG WRTSAF = OFF CONFIG LVP = OFF CONFIG CP = OFF #ENDCONFIG 'Defines, Includes, and Constants----------------------------------------------- DEFINE OSC 64 ' Calibrate PBP to 64MHz clock OSCFRQ = 001000 ' Set system clock to 64MHz internal on interrupt goto INC_TICK 'Direction---------------------------------------------------------------------- TRISA = 000000 TRISB = 000000 TRISC = 000000 'Alias--------------------------------------------------------------------------- LED VAr PORTA.1 'Variables---------------------------------------------------------------------- 'Initialize Registers---------------------------------------------------------------------- Initilize: ANSELA = 000000 ' Set digital ANSELB = 000000 ' Set digital ANSELC = 000000 ' Set digital ADCON0 = 000000 ' Disable ADC CM1CON0.7 = 0 : CM2CON0.7 = 0 'Disable comparators PMD0=$FF : PMD1=$FF : PMD2=$FF PMD3=$FF : PMD4=$FF : PMD5=$FF PMD6=$FF : PMD7 = $FF PMD1.bit1 = 0 'Turning on the TMR1 peripheral module T1CON = 110000 'Prescale 1:8; Disable the TMR1 T1GCON.bit7 = 0 'Disable gate, TMR1 always counting T1CLK = 000001 'Clock Source Fosc/4 TMR1H = $00 : TMR1L = $00 PIR4.bit0 = 0 'Clear the Int flag PIE4.bit0 = 1 'Enable timer int INTCON0.bit7 = 1 'Enable global int T1CON.bit0 = 1 'Start the timer LED = 0 'Code--------------------------------------------------------------------------- Main: pause 1 Goto Main '----- INTERRUPT CODE ------------------- Disable INC_TICK: toggle LED TMR1L = $00 : TMR1H = $00 PIR4.bit0 = 0 Resume enable '------ END OF INTERRUPTS CODE ----------
I apologize for throwing two sets of code at you. I would be very happy if I could get either method to work. Software particulars: PBP 3.1.1.4; MPASM 5.0.0.5; MPLABX 5.76; Microcode Studio Plus 4.05. I am guessing I missed something or forgot to turn something on. I would love to learn more about "DEFINE INTHAND" but would be very happy to get any timer interrupt to work with any method possible at this point.
Any advice would be appreciated.
-Jon
Originally Posted by mpgmike
Thank you for the synopsis on the "DEFINE INTHAND," this is very useful information. I have a working knowledge of ASM. To me, it is easier to read than write. Your post did indeed help me decide a newer direction...K40's! 
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