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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.

What is the question?

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.

eloma33 wrote: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"?

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 !

eloma33 wrote: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?

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).

eloma33 wrote: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?

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

eloma33 wrote: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.