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Ttelmah
Joined: 11 Mar 2010
Posts: 19557
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 Posted: Fri Jan 17, 2014 2:33 am |
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As I said _without WDT_.
You are meant to be testing whether your chip is actually clocking at 64MHz, _first_. The code you have posted proves nothing about the clock speed, and is a waste of space.
However, add the line:
setup_oscillator(OSC_PLL_ON|OSC_16MHz);
at the start of your main.
On these chips, the PLL, when running with the internal oscillator, is a _software enabled_ option, not a fuse option. Now most modern compilers 'know' this, and will correctly enable it, but some slightly older ones need this line, and it does 'no harm' anyway. |
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Fri Jan 17, 2014 4:11 am |
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| Ttelmah wrote: | Seriously, do what PCM programmer said a few posts ago, and step 'back' to a simple flash an LED program. No WDT.
Verify that at each clock rate you are trying to use, with a one second 'flash', the LED does flash at one second intervals.
.............................................
Adding a watchdog, without proper code to control it, is pointless, and won't help your code reliability at all. |
Please tell us what your 'blinking rates' are.
To me, you're doing too many tests.
You should not need more than two:-
1) Which does not exercise the WDT.
2) Which does with only one minor change.
Mike
PS You're also confusing me by comparing Test 3 with itself!
| Quote: | Test 3 : clock 4Mz, Watchdog timer prescale: 1:1(4ms)
--> LED is blinking well like test 3.but period of blinking is shorter than test 3. Namely led is blinking rapidly. |
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temtronic
Joined: 01 Jul 2010
Posts: 9249
Location: Greensville,Ontario
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| Posted: Fri Jan 17, 2014 6:49 am |
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Since the 26k22 is the smaller brother of the 46k22, here's a working 'flashing LED ' program to try.
| Code: | //46k22 1Hz LED test program
#include <18f46k22.h>
// #include "46k22_fuses.h"
//46k22 fuses
#fuses H4 //uses PLL*4 speed
#fuses INTRC_IO //use internal osc (yes !!)
//#fuses XT //4MHz xtal with caps
//#fuses nopllen //disable PLL (NOT x4 speed !)
#FUSES noMCLR //Master Clear pin disabled,pin 1( RE3 available !)
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV20 //Brownout reset at 2.0V
#FUSES PUT //Power Up Timer
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOFCMEN //Fail-safe clock monitor enabled
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NOIESO //Internal External Switch Over mode enabled
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#include "46k22_pins.h"
#use delay(clock=64000000)
#define LED PIN_B3
//************************************
void main() {
while(1) {
delay_ms(500);
output_toggle(LED);
}//***************end of forever while
}//************************end of main
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please copy/paste/compile/test and confirm the LED is flashing at a 1Hz rate. I've tested this with a real 4MHz xtal/caps as well as internal osc at both 16 and 64 MHz.
hth
jay |
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alx
Joined: 29 Jan 2014
Posts: 2
Location: Leon
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| 18f26k22 |
| Posted: Wed Jan 29, 2014 11:46 am |
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I have one question.
i have pic c compiler version 4.10 but i can't find the library for the 18f26k22.
anybody know where can i get it or download it? |
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temtronic
Joined: 01 Jul 2010
Posts: 9249
Location: Greensville,Ontario
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| Posted: Wed Jan 29, 2014 2:21 pm |
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You'll need to upgrade your compiler !
jay |
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