MB SID: LED-Matrix soldered transposed - SW-Solution?

[Laplace]

Hi everyone,

I managed to solder and build my MB SID Step C without any problems so far.

Everything works exept the LED-Matrix - all the LEDs are on all the time and

they flicker. I guess the reason is, that I soldered the Matrix "transposed",

that means I soldered all the anodes in rows and the kathodes in colums... ::) :o

It´s supposed to be the outer way round.

Has anyone digged deep enougt into the sw-routines of the matrix to know, how much work

it would be to solve that problem in the software? I gues i would have to invert all the

output signals.

Thanx so far,

Laplace

[Mr modnaR]

can you not just swap over the connections? if that still doesn't work, it sounds like something else could be causing the problem.

[Laplace]

I would have to solder the whole matrix again...

and that is not very easy since the legs of the

LEDs are arranged wrong now...the legs are in rows

and the shorter leg (katodes) would have to be

connected in rows but the anode-legs are in the way... :-\

[Mr modnaR]

you have 8 connections from the DOUT board to the anodes of the leds, and you have 7 connections to the cathodes, correct? if so, just swap the J5 and J6 connections on the DOUT remembering to have resistors on the J5 but jumpers on the J6.

[Laplace]

I just resoldered the whole thing...it drew me a lot of blood and sweat

but i managed to bend the kathodes backward and the anodes forward.

Then i had just enough room to solder it again.

It works now and I just found out that the LFOs are displayed in

realtime on the LEDs! I didn´t know that...it´s so cool!

And Mr modnaR...U make very cool tracks.

Thanks for the help.

[Mr modnaR]

glad to know you got it sorted! cheers for listening to the tracks, just some oldies really.

[TK.]

The alternative software solution looks simple: the values transfered to the shift registers have to be inverted. This can be done with a "xorlw 0xff" one line above each "call MIOS_DOUT_SRSet" instruction in cs_menu_matrix.inc

Best Regards, Thorsten.