PIC18F2550 Problem

[eloma33]

Hi,

When i program the 18F2550 with the cable and winpic, but I do an error : I have select hex file for the 2550 20Mhz, and on my PCB, the Xtal is a 12Mhz. So with winpic, I select "erase", I select the good hex file (12Mhz), and I chose "program", but when winpic verify the memory, there is error, and the pic is not programed.

When I do the first programmation, the USB works fine, but the programmation of the ATMEGA, it doesn't work. That's why I would like to erase the PIC and redo the programmation.

Thanks all for your help, and sorry for my very bad english.

[dmitri]

What is the question?

[eloma33]

First programmation success, but wrong hex file.

Second programmation don't works.

Is someone know why second programmation don't works ?

I would like to erase first program in the PIC, and write the good hex file.

[dmitri]

First programmation success, but wrong hex file.

Second programmation don't works.

Is someone know why second programmation don't works ?

Does the programmer give any more info besides very brief messages "success"/"don't work"?

[eloma33]

When I do the first programmation, the process success. When I connect the megadrum with usb, the PC find it. But I realise that I write PC with the PIC18H2550-20Mhz, and the programmation of the ATMEGA don't works, so I think it's because I write the wrong hex file in the PIC.

Then I would like to write the good one (PIC18F2550-16Mhz) in the PIC, but when I did this operation, I've got error, and the pic is not programmed.

I've got message like this :

Programming...
Erasing ("bulk" or "chip") ...
Programming CODE, 0x000000..0x001692
Verifying CODE, 0x000000..0x001692
Verifying 0x000000..0x001692
Verify Error: 000000: read 000000, wanted 00EF30, mask 00FFFF ==> diff=00EF30
Verify Error: 000002: read 000000, wanted 00F00B, mask 00FFFF ==> diff=00F00B
Verify Error: 000004: read 000000, wanted 000012, mask 00FFFF ==> diff=000012
Verify Error: 000006: read 000000, wanted 000012, mask 00FFFF ==> diff=000012
More Verify Errors, unable to list all (total=2875)
Programming CONFIG, 0x300000..0x30000C
Verifying CONFIG, 0x300000..0x30000C
Verifying 0x300000..0x30000C
Verify Error: 300000: read 000000, wanted 000E22, mask 00FFFF ==> diff=000E22
Verify Error: 300002: read 000000, wanted 001E3F, mask 00FFFF ==> diff=001E3F
Verify Error: 300004: read 000000, wanted 0081FF, mask 00FFFF ==> diff=0081FF
Verify Error: 300006: read 000000, wanted 00FF85, mask 00FFFF ==> diff=00FF85
More Verify Errors, unable to list all (total=7)
ERROR: Programming FAILED !

[dmitri]

Verify Error: 000000: read 000000, wanted 00EF30, mask 00FFFF ==> diff=00EF30

Judging by this you either not powering your PIC while trying to program it or there is a problem with the ICSP cable (not connected properly, broken).

And I don't understand why you keep mentioning Atmega here. How is it relevant?

[eloma33]

Thank for your help. I'm going to check my cable tomorow, but I'm not sure this is the solution because I mesure tension on the PIC, and I've got the good tension on the PIC (5v, 3.3v).

I'm speaking about ATMEGA because when I program PIC for the first time, the usb work, but not the programmation of the ATMEGA. It's perhaps because I don't write the good hex file in the PIC (PIC18F2550-20Mhz instead of PIC18F2550-12Mhz).

[dmitri]

Thank for your help. I'm going to check my cable tomorow, but I'm not sure this is the solution because I mesure tension on the PIC, and I've got the good tension on the PIC (5v, 3.3v).

If you're not sure this is the solution than you must have a solution in mind. What is it?

I'm speaking about ATMEGA because when I program PIC for the first time, the usb work, but not the programmation of the ATMEGA. It's perhaps because I don't write the good hex file in the PIC (PIC18F2550-20Mhz instead of PIC18F2550-12Mhz).

I still don't understand. How are trying to program Atmega using PIC?

[eloma33]

My question is : is it possible to reprogram a pic once it had been programmed ?

When I read the forum, I understand than to program the ATMEGA :
- first program the pic (to active USB) with ICSP cable.
- second : use usb cable and MDFUpdateGUI or mdfwupdate to program the ATMEGA (by using button sequence on the megadrum)

I also find 3 files (bootloader32.hex, bootloader324.hex and bootloader644.hex) on the forum, but I don't know when I use them ?

The procedure to program PIC and ATMEGA is a little difficult for me. Sorry

[dmitri]

My question is : is it possible to reprogram a pic once it had been programmed ?

Yes.

When I read the forum, I understand than to program the ATMEGA :
- first program the pic (to active USB) with ICSP cable.
- second : use usb cable and MDFUpdateGUI or mdfwupdate to program the ATMEGA (by using button sequence on the megadrum)

Only if Atmega has the protected bootloader.