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Forum Index : Microcontroller and PC projects : Select Case...
| Author | Message | ||||
| expo Newbie  Joined: 10/01/2016 Location: AustraliaPosts: 24 |
Hello all, I'm having trouble getting my SELECT CASE script to do what I want (maybe it can't do it anyway!). I have SETPIN 2 (and 3), DOUT DDD%=64 select case DDD% case is <32 port(14,5)=DDD% case is >=32, is <64 pin(2)=1 'ARMDIS%=1 'DEBUG port(14,5)=(DDD%-32) case is >=64, is <128 pin(3)=1 pin(2)=1 'ARMDIS%=1 'DEBUG 'OTHER1%=1 'DEBUG port(14,5)=(DDD%-96) I'm expecting pins 2 & 3 to go high, but only pin 2 does. There is a CASE ELSE and END SELECT as well. The whole script runs without errors, but pin 3 does not go high, as measured by multimeter. Any thoughts? EDIT I am running MMII (170) with 4.06 (4.6b) and have tried a second 'mite. Thanks, greg |
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| MikeO Senior Member  Joined: 11/09/2011 Location: AustraliaPosts: 275 |
@ expo try 64 to 128 instead of case is >=64, is <128 Mike Codenquilts |
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| expo Newbie Joined: 10/01/2016 Location: AustraliaPosts: 24 |
Thanks for the suggestion MikeO but it didn't change the output. Pin 3 still remains off. greg |
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| WhiteWizzard Guru  Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
@expo First of all, can you inform us which version of MMBasic; and what type of MicroMite? Also, some things to quickly try: 1> Check Pin(3) LED is ok. Issue a PIN(3)=1 command at the command prompt to ensure electrical connectivity (and hardware) is ok 2> Drop the 'IS' and change to >63 rather than >=64 (in case of firmware bug) WW For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| expo Newbie Joined: 10/01/2016 Location: AustraliaPosts: 24 |
Hello WW, I have tried MikeO's suggested "64 to 127", but there was no change. I tried your suggestion ">63, <128", but no luck there either. After the thought process from you both I tried "63<DDD%<128", - no banana either. I am using MMII (170) 28 pinner, MMBasic 4.6, MMEdit 3.6.4 OS Ver10 (14/9/15). I have been measuring the output at the MMII pin to avoid spurious extraneous hardware faults. Can anyone replicate this fault or confirm their system works OK? greg |
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| expo Newbie Joined: 10/01/2016 Location: AustraliaPosts: 24 |
Hello MikeO and WW (and other watchers), I think I have an issue wit resetting the pins when DDD% changes downwards. Stay tuned whilst I work on it .... sometime! Thanks for your review and the time to respond. I will post any enlightenment. greg |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
@expo And have you confirmed that PIN(3)=1 turns on the LED? Or are you saying that you have no LEDs connected and are just using a multimeter? Is the 28pinner mounted on a breadboard? If so, ensure you measure the voltage directly on the PIC pin 3 and not a position connected to pin 3 via the breadboard. If you're not aware, there have been many posts about issues for people using breadboards, and these always turn out to be 'faulty' (cheap) breadboards. keep us informed with progress . . . . WW For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
Yes, maybe a negative ddd% causes the issue! You're checking for: 64 <= DDD% < 128 and if so, subtracting 96 from it and setting pins to potentially a negative value of DDD%. Is this the issue maybe?? For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3165 |
Without decoding the program logic the problem could be caused by the fact that the expressions on the CASE line are ORed. For example, CASE 1, 2, 3 will be true if the test number is 1 -or- 2 -or- 3 So case is >=32, is <64 Will be always true because the test number will always be greater than 32 -or- less than 64. I should update the documentation to clarify this. Geoff Geoff Graham - http://geoffg.net |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
DDD% = 64
SELECT CASE DDD% CASE IS <32 print "<32" CASE IS <64 print ">=32 and <64" CASE IS <128 print ">=64 and <128" CASE ELSE print ">=128" END SELECT There is no need to test for >=32 etc because is the first test for 'less than' passes, the remainder of the SELECT statement is ignored. Jim VK7JH MMedit MMBasic Help |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
I am curious as to why LED on Pin 3 is not coming on when DDD%=64 (i.e. the posted issue). The code originally posted should turn it on shouldn't it?? TassyJim: Your code is the 'tidy' solution in terms of coding but can you see why Pin 3 won't go high in expo's code? WW For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
Also - what happens if your use the PORT command with a negative number (as it would be when DDD%=64)? 
Does MMBasic generate an error message? OR is the value ignored? Or is it outputted as two's complement? I am not with a MM at hand at the moment so can not try this one just now. For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
The line case is >=32, is <64
will be the one executed when DDD% = 64 because as Geoff pointed out, the comma is an OR not AND This sets PIN 2 high The CASE with PIN 2 and PIN 3 high never gets acted on because of the line above getting first choice. Jim VK7JH MMedit MMBasic Help |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2794 |
Yep - silly me  For everything Micromite visit micromite.org Direct Email: whitewizzard@micromite.o |
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| expo Newbie Joined: 10/01/2016 Location: AustraliaPosts: 24 |
Hello all, CASE = 64 does turn on pins 2 & 3. Any other combination of <, >, <=, etc fails because as Geoff has clarified they are -OR-'d. In the short term I will abandon use of SELECT CASE because it overly complicates my logic (and me!). PORT(14,5)=DDD% works well, so I will work around the higher numbers another way. Thanks to all for your efforts. greg |
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