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sandrewww
Joined: 29 Jun 2006
Posts: 8
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| 16F689 Comparator2 turned on by itself? |
 Posted: Sat Apr 28, 2007 6:35 pm |
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This is sortof in follow-up to a post I made earlier this week about my 16f689 not working with my LCD. (http://www.ccsinfo.com/forum/viewtopic.php?t=30570&start=0&postdays=0&postorder=asc&highlight=16f689)
I tracked the problem to my C4 pin not toggling...
Then I finally tracked the reason to be this: the comparator 2 had turned itself on, and was comparing two of my digital inputs.
This was a very simple program so I'm not sure why the comparator was turned on but I had to manually clear the C2OE and C2ON bits before my program worked like it's supposed to.
compiler bug? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Apr 28, 2007 11:43 pm |
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On a question about a possible compiler bug, you should post the
compiler version. |
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sandrewww
Joined: 29 Jun 2006
Posts: 8
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| Posted: Sun Apr 29, 2007 9:20 pm |
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right-click properties -> version
says 4.0.0.207 |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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sandrewww
Joined: 29 Jun 2006
Posts: 8
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| Posted: Mon Apr 30, 2007 5:03 pm |
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ah ok thanks..
from the .lst:
CCS PCM C Compiler, Version 4.018 |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 30, 2007 5:21 pm |
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I installed PCM vs. 3.214 and got this error message upon trying to
compile a test program:
| Quote: | | Unknown device type "PIC16F689" |
You probably used the Device Editor to add this PIC to your version.
If so, it's likely that the start-up code inserted by the compiler is at
least partially incorrect.
Here's the startup code generated by vs. 4.032. You may have to
add some C code to the start of your main() to duplicate these settings
if the existing startup code is doing it incorrectly.
In your post, you said that you have already done this.
| Code: | .................... void main()
.................... {
0004: CLRF 04
0005: BCF 03.7
0006: MOVLW 1F
0007: ANDWF 03,F
0008: BSF 03.6
0009: BCF 1F.0
000A: BCF 1F.1
000B: BCF 1F.2
000C: BCF 1F.3
000D: BCF 03.6
000E: BCF 1F.6
000F: MOVLW 00
0010: BSF 03.6
0011: MOVWF 1E // ANSEL = 0
0012: CLRF 19 // CM1CON0 = 0
0013: CLRF 1A // CM2CON0 = 0
0014: BSF 03.5
0015: CLRF 1E // SRCON = 0
0016: BCF 03.5
0017: CLRF 1B // CM2CON1 = 0
0018: BCF 03.6
0019: BCF 0D.5 |
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sandrewww
Joined: 29 Jun 2006
Posts: 8
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| Posted: Mon Apr 30, 2007 8:11 pm |
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hey, thanks for the quick responses :-)
i made a mistake in my response with my correct version number -- you must've caught me before i fixed it..
i've got PCH and PCM, and accidentally gave my pch version first.
PCM, which should be compiling this 16F code, is version 4.018 according to the top of my .lst file.
I had to upgrade mplab to 7.5 before it allowed me to program the thing with my ICD2, but it compiles/works with no hacking on my part.
here's the beginning of my program from the .lst:
| Code: | .................... void main()
.................... {
*
0462: CLRF 04
0463: BCF 03.7
0464: MOVLW 1F
0465: ANDWF 03,F
0466: MOVLW 71
0467: BSF 03.5
0468: MOVWF 0F
0469: BCF 03.5
046A: BSF 03.6
046B: BCF 1F.0
046C: BCF 1F.1
046D: BCF 1F.2
046E: BCF 1F.3
046F: BCF 03.6
0470: BCF 1F.6
0471: MOVLW 00
0472: BSF 03.6
0473: MOVWF 1E
0474: MOVLW 07
0475: MOVWF 19
0476: MOVLW FF
0477: MOVWF 1A
0478: BSF 03.5
0479: CLRF 1E
047A: BCF 03.5
047B: CLRF 1B
047C: BCF 03.6
047D: BCF 0D.5
.................... short onoff = 0;
*
0495: BCF 74.0
.................... char temp = 0;
0496: CLRF 75
.................... char tmpStr[8];
.................... int8 i = 0;
0497: CLRF 7E
....................
.................... char c;
....................
.................... C2ON = 0;
0498: BSF 03.6
0499: BCF 1A.7
.................... C2OE = 0;
049A: BCF 1A.5
....................
.................... setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
049B: MOVLW 85
049C: BCF 03.6
049D: MOVWF 10 |
where i earlier defined:
| Code: | .................... #bit C2ON = 0x11A.7
.................... #bit C2OE = 0x11A.5 |
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