3.1 Synthex board problem (1 row of solid white boxes)

[samdrum]

Synthex's kit v3.1 already has the pullup resistor - R28. You should ask Synthex about the firmware in the PIC.

Actually, I have Synthex kit 2.8 (I have to admit it was somewhat misleading since this subject was initiated by a 3.1 user). My configuration is the following:

Board type: Synthex 2.8
Firmware: 20090517 (supplied by Synthex)
Chip: ATMega32 16PU 0807D
Used crystal: 16Mhz (as advised for this Chip in the build instructions by Synthex).

Dimitri, I don't know what firmware version was supplied for the PIC18F2550; I will have to contact Synthex for that. Furthermore, according to the 2.8 schematic, the pullup resistor is NOT present on pin 26 of PIC18F2550 on my 2.8 board. Do you think this fix will solve my problems? That is, do you expect that my problems are similar to the problems that you've experienced and mentioned in this topic? https://www.megadrum.info/~megadrum/forums/viewtopic.php?f=3&t=268?

Where in the manual is it advised? I will correct it.

Dimitri, please neglect this one. I found it on the first page of this (old) pdf file: http://www.megadrum.info/old_site/menu_layout.pdf. The new documentation, which I couldn't access at that time, explains that I should use 31250:

You can change it between 31250 (default) and 38400. You will only want to set it to 38400 if you're using an old type AVR-CDC USB Serial board. With a PIC18F2550 USB MIDI board you must always leave it as 31250.

Thanks!

[dmitri]

Synthex's kit v3.1 already has the pullup resistor - R28. You should ask Synthex about the firmware in the PIC.

Actually, I have Synthex kit 2.8 (I have to admit it was somewhat misleading since this subject was initiated by a 3.1 user).

If you have Synthex' kit 2.8 then you must follow https://www.megadrum.info/~megadrum/for ... ?f=3&t=268 before looking into anything else.

[samdrum]

Thanks a million Dimitri! A 33k resistor did the trick for me!

Now it's drum building time!