Can a PIC be a bit faulty? - Page 2 - Electronic Circuits Projects Diagrams Free

Mickster · 10th April 2008, 06:52 PM

Quote:

Originally Posted by mike50

The hex file doesn't contain config data.

Firstly, I'll get this bit out of the way...I'm still a noob, but hope to gradually change this status.

I'm not here to pick an argument, but the quote above differs from what I had initially thought, along with what I have just pulled up on 'the net'.

For instance, the datasheet for this PIC lists the Config bits in address 2007h and a disassembly (Using IC-Prog) of the .HEX file shows:

Code:

ORG    0x2007
DATA   0x1F

toward the end of the file.

Also, in this link:
http://books.google.co.uk/books?id=d...d2pxw54U&hl=en

the first paragraph mentions Config fuses in the .HEX file.

Please can you expand on your statement?

**Nigel Goodwin** · 10th April 2008, 07:55 PM

Quote:

Originally Posted by Mickster

Firstly, I'll get this bit out of the way...I'm still a noob, but hope to gradually change this status.

I'm not here to pick an argument, but the quote above differs from what I had initially thought, along with what I have just pulled up on 'the net'.

For instance, the datasheet for this PIC lists the Config bits in address 2007h and a disassembly (Using IC-Prog) of the .HEX file shows:

Code:

ORG    0x2007
DATA   0x1F

toward the end of the file.

Also, in this link:
http://books.google.co.uk/books?id=d...d2pxw54U&hl=en

the first paragraph mentions Config fuses in the .HEX file.

Please can you expand on your statement?

He didn't say ALL HEX files don't contain the config data, they can, and they should - but some people create HEX files without any config data in it. Presumably the particular file under discussion didn't contain config data, and the programmer should warn you when you load it (WinPicProg does).

Mickster · 10th April 2008, 08:50 PM

Quote:

Originally Posted by Nigel Goodwin

He didn't say ALL HEX files don't contain the config data, they can, and they should...

Ah, thanks for clearing that up, I took "The Hex file..." literally.

Quote:

Originally Posted by Nigel Goodwin

... Presumably the particular file under discussion didn't contain config data, and the programmer should warn you when you load it (WinPicProg does).

Would the section:

Code:

         ORG     0x2000
            DATA    0x0F
            DATA    0x0F
            DATA    0x0F
            DATA    0x0F
 
            ORG     0x2007
            DATA    0x1F
 
            ORG     0x2100
            DATA    0xFF
            DATA    0xFF
            DATA    0xFF
            DATA    0xFF....

from the IC-Prog disassembly of the file under discussion indicate whether Config data is present within the HEX file?

The datasheet mentions "Address 2007h is beyond the user program memory space and it belongs to the special test/configuration memory space (2000h - 3FFFh). This space can only be accessed during programming."

Am I mis-interpretting the disassembly to contain something that is not there?

Thanks.

mike50 · 10th April 2008, 08:51 PM

Quote:

Originally Posted by Mickster

Firstly, I'll get this bit out of the way...I'm still a noob, but hope to gradually change this status.

I'm not here to pick an argument, but the quote above differs from what I had initially thought, along with what I have just pulled up on 'the net'.

For instance, the datasheet for this PIC lists the Config bits in address 2007h and a disassembly (Using IC-Prog) of the .HEX file shows:

Code:

ORG    0x2007
DATA   0x1F

toward the end of the file.

Also, in this link:
http://books.google.co.uk/books?id=d...d2pxw54U&hl=en

the first paragraph mentions Config fuses in the .HEX file.

Please can you expand on your statement?

The hex file in question from the site identified in the original post

Quote:

Originally Posted by bigal_scorpio

The program I'm trying to use is the RevMaster Firmware Zip at http://www.jeffree.co.uk/pages/tachometer-pcbs.html

contained no CONFIG data.

Mike

**Nigel Goodwin** · 10th April 2008, 09:42 PM

Quote:

Originally Posted by Mickster

from the IC-Prog disassembly of the file under discussion indicate whether Config data is present within the HEX file?

No, it's disassembling what's in memory, and as IC-Prog originally used my old 16 bit dis-assembler (even with my name on the resultant files) I presume it still works the same way, using the default config fuses or the value it's been set to.

Mickster · 10th April 2008, 09:53 PM

Gotcha. Opened IC-Prog & loaded the original .HEX, viewed disassembly, changed the fuses & viewed disassembly again. Lo and behold, different values.

Thanks Nigel & Mike.

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10th April 2008, 09:53 PM	(permalink)
Mickster	Gotcha. Opened IC-Prog & loaded the original .HEX, viewed disassembly, changed the fuses & viewed disassembly again. Lo and behold, different values. Thanks Nigel & Mike.