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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Wed Sep 14, 2011 3:28 pm |
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Try this test program. Install a 10 MHz crystal (and capacitors) on the
PIC and see if the LED blinks once per second (1 Hz).
| Code: |
#include <18F4680.h>
#fuses H4,NOWDT,PUT,BROWNOUT,NOPBADEN,NOLVP
#use delay(clock=40M)
//====================
void main()
{
while(1)
{
output_toggle(PIN_B0); // Blink LED
delay_ms(500);
}
} |
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magic_mauve
Joined: 05 Apr 2011
Posts: 12
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| Posted: Thu Sep 15, 2011 2:32 am |
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Thanks for all this advice. I have made progress as I can spot the byte I need to change in the hex file to set up the PLL correctly. Does anyone know how the checksum is calculated for a line in the hex file? This needs changing too before I can program.
Thanks
magic_mauve |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19510
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| Posted: Thu Sep 15, 2011 4:10 am |
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The checksum is 'standard' Intel Hex. Any number of websites giving details of this.
However you can just set the byte using a #ROM statement, and the checksum is then calculated for you.
Do you have the IDE?. If so, you can set the fuses from the device editor.
However getting more puzzled what is going on.....
Just took PCM programmer's demo program. Compiled it 'as is', with 4.100, loaded it into my programmer, and it correctly has the PLL setup.
The compiler _is_ setting the bits correctly.
Loading it into MPLAB, gives:
| Code: |
300001 06 OSC Oscillator HS-PLL enabled freq=4xFosc1
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Then, just to be sure, went back in time to V4.070, and this too sets the PLL correctly. Then tried 4.104, and so does this.
| Code: |
//From 4.070
Configuration Fuses:
Word 1: 0600 H4 NOIESO NOFCMEN RESERVED
Word 2: 1E1E BROWNOUT NOWDT BORV21 PUT WDT32768
Word 3: 8000 NOPBADEN NOLPT1OSC MCLR RESERVED
Word 4: 0081 STVREN NODEBUG NOLVP BBSIZ1K NOXINST RESERVED
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTC NOWRTB
Word 7: 400F NOEBTR NOEBTRB
//From 4.100
Configuration Fuses:
Word 1: 0600 H4 NOIESO NOFCMEN
Word 2: 1E1E BROWNOUT NOWDT BORV21 PUT WDT32768
Word 3: 8000 NOPBADEN NOLPT1OSC MCLR
Word 4: 0081 STVREN NODEBUG NOLVP BBSIZ1K NOXINST
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTC NOWRTB
Word 7: 400F NOEBTR NOEBTRB
//From 4.104
Configuration Fuses:
Word 1: C600 H4 IESO FCMEN
Word 2: 1E1E BROWNOUT NOWDT BORV21 PUT WDT32768
Word 3: 8400 NOPBADEN LPT1OSC MCLR
Word 4: 00B1 STVREN NODEBUG NOLVP NOXINST BBSIZ4K
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTC NOWRTB
Word 7: 400F NOEBTR NOEBTRB
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All are correctly setting the PLL.
Then tried another test. Manually set the byte using the #fuses statement to '0' (just as a test), and it happily sets the register to 0:
| Code: |
Configuration Fuses:
Word 1: 0000 LP NOIESO NOFCMEN
Word 2: 1E1E BROWNOUT NOWDT BORV21 PUT WDT32768
Word 3: 8600 PBADEN LPT1OSC MCLR
Word 4: 00B1 STVREN NODEBUG NOLVP NOXINST BBSIZ4K
Word 5: C00F NOPROTECT NOCPD NOCPB
Word 6: E00F NOWRT NOWRTD NOWRTC NOWRTB
Word 7: 400F NOEBTR NOEBTRB
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You have something else getting in the way. Are you _sure_ your programmer is setup to read the fuses from the incoming file?.
Are you sure you don't have a #ROM somewhere in the code, or another #fuses line being loaded?.
The problem is _not_ with the compiler.
Best Wishes |
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magic_mauve
Joined: 05 Apr 2011
Posts: 12
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| Posted: Thu Sep 15, 2011 8:15 am |
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Thank you. I got the same results as you and I have now found the problem.
I was using
#use DELAY(crystal=16000000)
when I changed this to:
#use DELAY(clock=16M)
H4 gets set correctly.
Many thanks for your help. |
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