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brianm
Joined: 08 Mar 2008
Posts: 17
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| why does this code go to sleep |
 Posted: Mon Jan 11, 2010 12:50 pm |
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this code does not loop....so simple yet pulling my hair out...yikes
thanks
| Code: | #include <16F690.h>
#device adc=10
#fuses INTRC_IO, NOWDT, BROWNOUT
#use delay(clock=4000000)
int main() {
set_tris_a(0b00000000); // 1 is input 0 is output
set_tris_b(0b10000000);
set_tris_c(0b00010000);
while(1==1)
{
output_high(pin_c0);
}
} |
Last edited by brianm on Mon Jan 11, 2010 1:04 pm; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jan 11, 2010 12:51 pm |
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How do you know it goes to "sleep" ? What tests are you doing to
prove this ? |
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brianm
Joined: 08 Mar 2008
Posts: 17
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| led isnt staying lite |
| Posted: Mon Jan 11, 2010 1:06 pm |
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the led on pin c0.....is not staying on...it comes on once then off....and thats it.
shouldnt the while loop keep executing. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jan 11, 2010 1:10 pm |
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How is this being tested ? In hardware or in a simulator ?
Does the LED have a series resistor, to limit the current ? |
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brianm
Joined: 08 Mar 2008
Posts: 17
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| testing |
| Posted: Mon Jan 11, 2010 4:08 pm |
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Testing is being done with hardware...breadboard.
The hardware works as I wrote an assembler program to do the same thing and no problem.
Led connected in series with pin C0 via a 220 ohm resistor.
Ultimately I want to have 2 switch used to increment/decrement a number used as an alarm point.
I do see the led come on once when I first burn the PIC but then I expected the led to stay on for ever.
Brian |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Jan 11, 2010 4:41 pm |
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Post your compiler version. It's given at the top of the .LST file, which
will be in your project directory after a successful compilation. It's a
4-digit number in this format: x.xxx |
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rnielsen
Joined: 23 Sep 2003
Posts: 852
Location: Utah
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| Posted: Mon Jan 11, 2010 5:15 pm |
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Try flashing the LED. That will tell you if it is, actually, sleeping.
| Code: | while(1)
{
output_high(pin_c0);
delay_ms(500);
output_low(pin_c0);
delay_ms(500);
} |
Or something like that. The LED should flash and not stop.
Ronald |
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brianm
Joined: 08 Mar 2008
Posts: 17
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| further information |
| Posted: Tue Jan 12, 2010 9:51 am |
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Version numbers
CCS PCM C Compiler, Version 4.062, 41368 12-Jan-10 09:40
mplab 8.43
windows vista
programmer pickit2
in mplabsim it seems to work the way it is suppose to...although I am not that versed on the simulator, this has been a good chance to make use of it as it is a simple program to follow....
include the .lst file for reference
-----------------------------------------
Thanks for the flashing idea...but I tried that too....in case I had the wrong logic but still no joy....
| Code: | CCS PCM C Compiler, Version 4.062, 41368 12-Jan-10 09:40
Filename: F:\microchip\projects in c\first c program.lst
ROM used: 83 words (2%)
Largest free fragment is 2048
RAM used: 7 (3%) at main() level
8 (3%) worst case
Stack: 1 locations
*
0000: MOVLW 00
0001: MOVWF 0A
0002: GOTO 019
0003: NOP
....................
.................... #include <16F690.h>
.................... //////// Standard Header file for the PIC16F690 device ////////////////
.................... #device PIC16F690
.................... #list
....................
....................
.................... #fuses INTRC_IO, NOWDT, BROWNOUT
.................... #use delay(clock=4000000)
0004: MOVLW 27
0005: MOVWF 04
0006: BCF 03.7
0007: MOVF 00,W
0008: BTFSC 03.2
0009: GOTO 018
000A: MOVLW 01
000B: MOVWF 21
000C: CLRF 20
000D: DECFSZ 20,F
000E: GOTO 00D
000F: DECFSZ 21,F
0010: GOTO 00C
0011: MOVLW 4A
0012: MOVWF 20
0013: DECFSZ 20,F
0014: GOTO 013
0015: GOTO 016
0016: DECFSZ 00,F
0017: GOTO 00A
0018: RETLW 00
....................
....................
.................... int main() {
0019: CLRF 04
001A: BCF 03.7
001B: MOVLW 1F
001C: ANDWF 03,F
001D: MOVLW 61
001E: BSF 03.5
001F: MOVWF 0F
0020: MOVF 0F,W
0021: BCF 03.5
0022: BSF 03.6
0023: BCF 1F.0
0024: BCF 1F.1
0025: BCF 1F.2
0026: BCF 1F.3
0027: BCF 03.6
0028: BCF 1F.6
0029: MOVLW 00
002A: BSF 03.6
002B: MOVWF 1E
002C: CLRF 19
002D: CLRF 1A
002E: BSF 03.5
002F: CLRF 1E
0030: BCF 03.5
0031: CLRF 1B
0032: BCF 03.6
0033: BCF 0D.5
....................
....................
.................... set_tris_a(0b00000000); // 1 is input 0 is output
0034: MOVLW 00
0035: BSF 03.5
0036: MOVWF 05
.................... set_tris_b(0b10000000);
0037: MOVLW 80
0038: MOVWF 06
.................... set_tris_c(0b00010000);
0039: MOVLW 10
003A: MOVWF 07
....................
.................... while(1==1)
.................... {
....................
.................... output_high(pin_c0);
003B: BCF 07.0
003C: BCF 03.5
003D: BSF 07.0
.................... delay_ms(1000);
003E: MOVLW 04
003F: MOVWF 26
0040: MOVLW FA
0041: MOVWF 27
0042: CALL 004
0043: DECFSZ 26,F
0044: GOTO 040
.................... output_low(pin_c0);
0045: BSF 03.5
0046: BCF 07.0
0047: BCF 03.5
0048: BCF 07.0
.................... delay_ms(1000);
0049: MOVLW 04
004A: MOVWF 26
004B: MOVLW FA
004C: MOVWF 27
004D: CALL 004
004E: DECFSZ 26,F
004F: GOTO 04B
.................... }
0050: BSF 03.5
0051: GOTO 03B
.................... }
....................
....................
....................
0052: SLEEP
Configuration Fuses:
Word 1: 3FE4 INTRC_IO NOPROTECT BROWNOUT MCLR NOCPD NOWDT PUT IESO FCMEN
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drh
Joined: 12 Jul 2004
Posts: 192
Location: Hemet, California USA
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| Posted: Tue Jan 12, 2010 10:03 am |
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RC0 is an analog input at power up. You need to configure it for digital I/O.
It's in the data sheet.
_________________
David |
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Henry8
Guest
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| Posted: Tue Jan 12, 2010 10:08 am |
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| Analog / Comparator setup?. |
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mkuang
Joined: 14 Dec 2007
Posts: 257
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| Posted: Tue Jan 12, 2010 10:11 am |
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| WIth your original code what do you get at RC0 when you measure it with a voltmeter? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jan 12, 2010 11:24 am |
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I installed vs. 4.062 and used the program in your first post,
and programmed it into a 16F690 on a 3M breadboard. It worked.
However, initially it didn't work. So I reached over and wiggled
the series resistor and pushed it further into the 3M breadboard,
and then it worked. Solidly.
If it doesn't work for you, check all connections. Also:
1. What is the Vdd voltage on the PIC ?
2. Do you have an MCLR pull-up resistor ? |
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brianm
Joined: 08 Mar 2008
Posts: 17
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| more inforamtion |
| Posted: Wed Jan 13, 2010 5:00 pm |
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ok yes I had a 10k resistor to pin a3 -mclr.....
so i removed it and same thing......so i put a
#fuse nomclr in the program and it worked(s) fine
I still dont understand why it wont work with the mclr held high? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jan 13, 2010 5:46 pm |
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| Quote: |
I still dont understand why it wont work with the mclr held high?
programmer pickit2
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In the PICkit 2 User's Guide, on page 11 (pg. 15 in the Acrobat reader),
http://ww1.microchip.com/downloads/en/DeviceDoc/51553E.pdf
it describes a tickbox option in the Programmer menu for the PicKit 2:
| Quote: |
Hold Device in Reset -
When checked, the MCLR (VPP) pin is held low (asserted). When
unchecked, the pin is released (tri-stated), allowing an external
pull-up to bring the device out of Reset.
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I think it's likely that you have this option selected. It's holding MCLR
in a reset state. If you disable MCLR on the PIC, then it doesn't matter
if that pin is held low. |
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