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Guest
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| PIC 10F with WTD |
 Posted: Fri Nov 11, 2005 6:21 am |
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Hello all
I have code (just part):
#include <10F206.h>
#fuses NOMCLR,NOPROTECT,WDT
#ROM 0x2007 = {0x0FFB}//----------------------------------------------------------------------Configuration bit
#use delay(clock=4000000)//-------------------------oscilator 4MHZ
#use fast_io(B)
int8 num;
void main() {
num++;
if (num>7){
num=0;
do smth
}
#asm
// Prescaler to WDT, max division 2304mS
movlw 0x8F
OPTION
#endasm
sleep();
}
I want to measure something one per 20 sec. I use var num to save number of cycles between measuring. Than start WTD and go to sleep. After 2.3 sec mC will be reseted by wtd.
This code doesnt work. Parametern num will be 0 after reset not 1, 2, 3...
What s the right way to do?
Thanks |
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foothill
Guest
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| WDT operations |
| Posted: Fri Nov 11, 2005 8:26 am |
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There are several problems. Here's a general approach to Sleep/WDT:
| Code: |
#include "your chip.h"
#fuses WDT, etc
#use delay (clock=your clock in Hz)
<declare variables>
<define isr's>
void main() /*begin main*/
{
setup_wdt(WDT_2304MS);
<set starting values of variables, if needed; ie, num = 0>
while (TRUE) /*start an infinite loop inside main()*/
{
if (num <= 6)
{
reset_wdt()
num++ /* next if tests num; if still <7, goes back to sleep*/
}
if (num >=7) /* if num >=7, do stuff*/
{
while (there's stuff to do)
{
reset_wdt(); /*you _must_ reset WDT every so often while
awake*/
num = 0;
do stuff;
} /*note: when no more stuff to do, "while stuff" loop exits with
num = 0 and WDT = 0; flow will then exit "if num>=7"
loop and go to sleep*/
}
sleep
} /*end while (TRUE)*/
} /*end main()*/ |
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