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jt06
Joined: 01 Nov 2007
Posts: 6
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| Mysterious #ROM |
 Posted: Tue Nov 06, 2007 2:34 pm |
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Hi,
I have to write some values in EEPROM of a 18F4620 at programming time.
I use the code below:
| Code: | | #rom int8 0xF00020={0x41,0x64,0x43,0x64,0x4B,0x54,0x52,0x20,0x35,0x37,0x32,0x35,0x49,0x6E,0x69,0x74} |
My software does not work correctly, so I have controled the EEPROM content with WinPic800 and the result is:
I have only one byte over two in the EEPROM !!! 
The same think with IC-Prog.
Does anyone have an idea?
Thank's in advance for your help. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Nov 06, 2007 2:57 pm |
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Compile a test program and look in the hex file.
Test program:
| Code: |
#include <18F4620.h>
#fuses XT,NOWDT,BROWNOUT,PUT,NOLVP
#use delay(clock=4000000)
#rom int8 0xF00020={0x41,0x64,0x43,0x64,0x4B,0x54,0x52,0x20,0x35,0x37,0x32,0x35,0x49,0x6E,0x69,0x74}
//=======================================
void main()
{
while(1);
}
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The eeprom data is in the Hex file:
| Quote: | :020000040000FA
:1000000002EF00F0F86AD09EEA6AE96AC150C00BBC
:0C0010000F09C16E070EB46EFFD703008D
:0200000400F00A
:10002000416443644B54522035373235496E69740C
:020000040030CA
:0E00000000011E1E008381000FC00FE00F40A4
:00000001FF
;PIC18F4620 |
You didn't post your compiler version. This program was compiled with
PCH vs. 4.059. |
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jt06
Joined: 01 Nov 2007
Posts: 6
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| Posted: Tue Nov 06, 2007 3:20 pm |
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Hi,
I have compiled the test program and the result is the same:
:020000040000FA
:1000000002EF00F0F86AD09EEA6AE96AC150C00BBC
:0C0010000F09C16E070EB46EFFD703008D
:0200000400F00A
:10002000416443644B54522035373235496E69740C
:020000040030CA
:0E00000000011E1E008381000FC00FE00F40A4
:00000001FF
;PIC18F4620
My compiler version is 4.049
Regards |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Nov 06, 2007 3:31 pm |
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| Try a different programmer software. |
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Ttelmah
Guest
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| Posted: Tue Nov 06, 2007 3:37 pm |
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It looks like your programmer is handling this wrong then.
If you look at the two lines:
:0200000400F00A
:10002000416443644B54522035373235496E69740C
The first is an 'extended address'record, setting the offset to 0F000000, and the next loads 16 bytes, at 0020 from this point.
The compiler is generating the values correctly, but it looks as if your programmer is incorrectly handling this. I think it is getting confused by the fact that the EEPROM, like the main memory in the 18 series, is programmed in 16bit words, and is 'losing' the alternate bytes, and half the address offset.
You need to talk to the programmer manufacturers.
Best Wishes
Best Wishes |
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jt06
Joined: 01 Nov 2007
Posts: 6
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| Posted: Wed Nov 07, 2007 11:55 am |
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You're right.
It was a problem with the configuration of WinPic800.
It's necessary to uncheck :
File .HEX -> Data 18Fxxx Address * 2
in the Software Settings.
Thank's a lot for your helps.
Best regards |
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