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Forum Index : Microcontroller and PC projects : MicroMite resetting
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OA47 Guru  Joined: 11/04/2012 Location: AustraliaPosts: 982 |
I have been chasing my tail trying to work out why the MicroMite resets when launching from an interrupt. One pin monitors a line and when it goes low the software is set to read an analog input on another pin. When the interrupt calls the subroutine the program stops and displays the bootup text. Has anyone got any clues where else I could look? I have changed Vcap, put a small cap across the monitored pin and the analog input pin, tried pulling up and down on both pins, tried a larger cap across the 3v3 rail. Today I built a clean new PCB just in case I had hardware issues but the new board shows the same results. Running out of ideas............ |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9486 |
Very interesting. So, you have one pin as an interrupt - when it goes low, this fires the interrupt, which as part of that interrupt, calls a sub to read the analog voltage on another pin - correct? You have IRETURN at the end of your interrupt code? Can you not call the sub from the interrupt pin?(set the interrupt to call the sub, rather then loop to it, if that is what your interrupt code is doing) Could you please post your code? EDIT: If you ARE calling a sub as part of the interrupt, then you need an END SUB at the end of the interrupt, rather then an IRETURN - that could be your issue.... If we could have a quick gawk at your code.... Smoke makes things work. When the smoke gets out, it stops! |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
Will await you to post code but for now are you sure you have set the relevant pins correctly to inputs? If a pin is still an output and you are 'inputting' a voltage then you have a potential 'short'. This would then reset your MicroMite (3v3 line blip) and hence display the start-up message. I'm sure you have set things correctly but is worth a check!! 
WW |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9486 |
Excellent point, WW.  Smoke makes things work. When the smoke gets out, it stops! |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 982 |
Thanks Grogster & WW I am not in the shed at the moment so I will post some code shortly. |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 982 |
I have looked at posting some of the code but I have had to remove the comments as the program is over 600 lines long and I was running out of memory. Posting code without remarks would not be easy to follow. BTW I tried calling the particular sub within a loop and not by interrupt but the result is still the same. Would it be possible to discuss or list reasons for the micromite to reset. |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 982 |
Thanks WW I have a 1K resistor linking the micromite to the incoming 0v signal and the pin(15) is set as DIN |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6220 |
Can you at least post the sub. The usual culprit is a POKE but I doubt that this is the problem here. There could be a maths error that is not getting caught. Jim VK7JH MMedit |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6220 |
Are you using WATCHDOG anywhere in your program? How many Subs and Functions are there? Too many Subs and Functions has been known to cause a reboot. Jim VK7JH MMedit |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 982 |
Interestingly the reboot always happens within this sub: (I have inserted some comments to make it a little bit easier to follow) Sub VFARRAY ' SAMPLE THE INCOMING VF ANF FILL ARRAY WITH SAMPLES
Do While Pin(15)=0 'CD IS LOW Print PIX VFSMPL=Pin(25) 'READ VOLTAGE SAMPLE ON PIC PIN 25 KCTWORD(PIX)=VFSMPL 'LOAD SAMPLE INTO ARRAY PIX=PIX+1 'ARRAY COUNT INCREMENTS If PIX >999 Then MSG$="ERROR SAMPLES OVER 1000" EVENTLOG Exit Do EndIf 'Pixel(PIX/2,350-VSMPL*100)=1 'DRAW ON SCREEN OF MAXIMITE Loop Thinking that the issue may be memory limitations I got this screen at a reboot but it is not constant as the amount of samples can vary between 0 and 600 before the crash. got here 3
Flash: 15K (73% of 20K) Program (594 lines) 18b ( 1% of 1536b) 1 Saved Variables RAM: 6K (28%) 19 Variables 1K ( 3%) General 15K (69%) Free got here 4 Micromite MMBasic Ver 4.5 Copyright 2011-2014 Geoff Graham > |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
Out of interest, if you add a PAUSE 100 in your loop then do you still have the issue? You may not want a delay, but this is a process of elimination to see if it is a 'timing' issue on the analogue sample. You confirm above that pin(15) is set by DIN, but please confirm how you are setting pin 25 too! WW |
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| ajkw Senior Member  Joined: 29/06/2011 Location: AustraliaPosts: 290 |
Graeme, I am not sure if it will but does this arrangement make any difference? Rgds. Anthony. ''''''''''''''''''''''''''''''' Sub VFARRAY ' SAMPLE THE INCOMING VF ANF FILL ARRAY WITH SAMPLES Do While Pin(15)=0 and Pix < 999 'CD IS LOW Print PIX VFSMPL=Pin(25) 'READ VOLTAGE SAMPLE ON PIC PIN 25 KCTWORD(PIX)=VFSMPL 'LOAD SAMPLE INTO ARRAY PIX=PIX+1 'ARRAY COUNT INCREMENTS 'Pixel(PIX/2,350-VSMPL*100)=1 'DRAW ON SCREEN OF MAXIMITE Loop If PIX = 1000 Then MSG$="ERROR SAMPLES OVER 1000" EVENTLOG EndIf EndSub |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
. . . and in your Sub VFARRAY, do you have an End Sub? (It maybe in your code, but it is not in your post and may be causing the issue!) |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6220 |
There is function EVENTLOG. I assume that it is writing data somewhere. Try remming it out to eliminate it as the cause. Jim VK7JH MMedit |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 982 |
Definitely an End sub Print "NUMBER OF SAMPLES (PIX)";PIX;" 1ST & 10TH SAMPLE";KCTWORD(1);KCTWORD(10) 'PACKETSAMPLES=PACKETSAMPLES+PIX PIX=0 End Sub |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 982 |
Have tried wit this error trapping remmed out |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
Can you confirm Pin(25) setup. Also have you tried a delay in your loop (something short like PAUSE 100? |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3269 |
This problem could easily be caused by the interpreter stumbling over some sort of error in the BASIC program for which it was not expecting and thereby causing the CPU to throw an exception (which would cause a reboot). The trick here is to reduce the offending program to a few lines which will reliably demonstrate the issue - that is the hard part. Geoff Geoff Graham - http://geoffg.net |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6220 |
Still thinking.... How frequently do you call the sub and can you be certain that it has finished before the next call? So far, I haven't been able to recreate the error. Jim VK7JH MMedit |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 982 |
Geoff, I originally had the sampling done by pin (18) FIN but although the code seemed faultless I found that I could not get a reasonable resolution by frequency sampling. I decided to move to pin (25) AIN and do an amplitude sample and this is when I started to get problems with the code. Would it be possible that the Basic will reset because I am now using a 3V3 tolerant input and there may be a spike that is exceeding the 3V3 level? |
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