southpole

hi thorsten, sorry, i measured again more carefully this morning, and counted the pins more carefully. so, with the USB plugged in i measure 5V on P2.1/RXD1 and 0V on P2.0/TXD1 (also i checked P0.1/RXD3 and P0.0/TXD3 and get also 5V and 0V respectively). the voltage directly at the MIDI socket is 3.3 V at J12 and J20 (between middle/GND and square via / middle left pin of socket in rear view). this confuses me a little since according to the schematic i would expect 3.3V on the right side (M+). these voltages are the same with and without the ICs (IC1,IC2,IC4,IC5, LPC17) or jumpers (apart from J17) in their sockets. to me the soldering looks clean, all blobs look concave, shiny and covering just the pad ... and i also thoroughly cleaned the board with alcohol (if it is possible to attach images here i could attach a picture of it?) do you have further ideas of points where i could measure to find a short if there is one? thanks, Gerhard

hi all, this is my first post so first i would like to say hello, and then immediately ask for help :-) the problem is, MIDI OUT is not working on my CORE_LPC17. i've built the CORE_LPC17 module and got USB and MIDI IN working, i.e. i was able to install the bootloader via USB, and then the MIDIBOX_NG application. commands in the MIOS Studio terminal work fine. i tested the loopback as described on the MIDI troubleshooting page, and it works if i take out the LPC17 and short RX and TX via a jumper directly at the LPC socket (i installed female headers). so it looks as if there is no problem with the circuitry between the MIDI socket and the female headers... MIDI in works correctly with the LPC installed, if i send MIDI commands to MIDI IN i can see them via USB on the terminal in the midi monitor. but MIDI out does not work, there is no data transmitted. i put a LED against the MIDI out socket, and it flickers only briefly directly after power-up (i think no data is transmitted at that point) if i measure the voltage directly on the TX pin on the LPC board, it seems to be constantly at 5V... any ideas how i can proceed further? thanks!