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kevcon
Joined: 21 Feb 2007
Posts: 142
Location: Michigan, USA
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 Posted: Wed Apr 04, 2007 8:11 am |
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| Ok, what am I missing? |
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jecottrell
Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ
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| Posted: Wed Apr 04, 2007 8:28 am |
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| Quote: | | My counter variable is initialized to 0 at the beginning of the code but sleep is resetting all variables. |
| Quote: | Some registers are not reset in any way, they are
unknown on POR and unchanged in any other Reset.
Most other registers are reset to “Reset state” on
Power-on Reset (POR), MCLR, WDT or Wake-up on
pin change Reset during normal operation. They are
not affected by a WDT Reset during Sleep or MCLR
Reset during Sleep, since these Resets are viewed as
resumption of normal operation. |
You can't save variables through a RESET caused by a pin change?
I think you may have misunderstood the question based upon your code? |
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Static
Joined: 03 Apr 2007
Posts: 8
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| Posted: Wed Apr 04, 2007 8:33 am |
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| Just so I understand, there's no way for me to save the state of a one bit variable (or 8 bit) when using sleep()? |
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kevcon
Joined: 21 Feb 2007
Posts: 142
Location: Michigan, USA
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| Posted: Wed Apr 04, 2007 8:41 am |
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ok, but variables aren't saved in registers they are saved in ram and according to the disassembly the only two instructions that modify the counter location (0x13) are the ones I used.
| Code: |
CCS PCB C Compiler, Version 3.249, 33857 04-Apr-07 10:34
Filename: main.lst
ROM used: 21 words (8%)
Largest free fragment is 235
RAM used: 3 (19%) at main() level
3 (19%) worst case
Stack: 0 locations
*
0000: MOVWF 05
0001: GOTO 002
.................... #include <10F200.h>
.................... //////// Standard Header file for the PIC10F200 device ////////////////
.................... #device PIC10F200
.................... #list
....................
....................
.................... #case
....................
.................... #fuses NOMCLR
.................... #fuses NOPROTECT
.................... #fuses NOWDT
....................
....................
.................... #use delay(clock=4000000)
....................
....................
....................
....................
....................
.................... void main( void )
.................... {
0002: MOVLW DF
0003: OPTION
0004: CLRF 04
....................
.................... unsigned int8 counter;
....................
....................
....................
.................... switch ( restart_cause( ) ) {
0005: MOVF 03,W
0006: ANDLW D8
0007: BCF 03.6
0008: BCF 03.7
0009: BSF 03.3
000A: BSF 03.4
000B: XORLW 18
000C: BTFSC 03.2
000D: GOTO 012
000E: XORLW 88
000F: BTFSC 03.2
0010: GOTO 014
0011: GOTO 016
....................
.................... case NORMAL_POWER_UP :
.................... counter = 0;
0012: CLRF 13
.................... break;
0013: GOTO 016
....................
.................... case PIN_CHANGE_FROM_SLEEP :
.................... counter++;
0014: INCF 13,F
.................... break;
0015: GOTO 016
....................
....................
.................... }
....................
....................
....................
....................
.................... //Your Code Goes Here...
....................
....................
....................
....................
....................
.................... }
....................
0016: SLEEP
Configuration Fuses:
Word 1: 0FEB NOMCLR NOPROTECT NOWDT
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jecottrell
Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ
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| Posted: Wed Apr 04, 2007 8:58 am |
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Good point.
I was guessing the slate got wiped clean for any type of reset. The datasheet is unclear about the status of RAM during each type of RESET.
I guess the only way to figure it out is, try it....
John
BTW, I tried a 10F part once and got so fed up with it I went back to a regular part. It was really my fault because I failed to dig into the datasheet prior to designing and I paid the price. I just assumed they were fairly similar to the regular parts. |
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kevcon
Joined: 21 Feb 2007
Posts: 142
Location: Michigan, USA
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| Posted: Wed Apr 04, 2007 9:10 am |
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John,
You are right though, the registers are affected by RESET and can be tricky to handle.
I had the same experience, designed in a 10F200 on the first rev of my board and the next rev had a 12F629 designed in because the code for the 10F part drove me nuts.
Kevin |
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