whomper Posted March 24, 2007 Report Posted March 24, 2007 How do I test whether the IIC is built correctly, or whether the PIC is not burned?The lights are not working, although the core finds IIC1 and no MIDI is sent or received.Whomper Quote
stryd_one Posted March 25, 2007 Report Posted March 25, 2007 Tried this? iic_midi_sw_loopback_v1_0.zip Quote
whomper Posted March 25, 2007 Author Report Posted March 25, 2007 Yeah, it displays that there is an IIC1 and Seq3 also finds it, but the LEDs are not working and I would like to get some info on how to troubleshoot it via multimeter.Whomper Quote
stryd_one Posted March 25, 2007 Report Posted March 25, 2007 Well the activity LED's kinda say it all... Have you got the seq configured to use it - are you sure it's trying to send midi via IIC, not the core midi port? Quote
whomper Posted March 25, 2007 Author Report Posted March 25, 2007 I have.The issue is, I do not see the power LED lit (I think it is the green or the red).Does someone know an electronic test procedure for the board? Which pins should produce power etc?Perhaps I have nuked the PIC by mistake... :-(Whomper Quote
stryd_one Posted March 25, 2007 Report Posted March 25, 2007 Ohhh. If the power LED isn't lit, that's very strange, because the LED is lit as a part of the initialisation routine on startup. Obviously it is booting OK to some degree, as it is responding to IIC, but other pins are not working.Did you maybe overpower it, or solder with the PIC inserted?If you have a burner or jdm, I'd try reloading the firmware. Quote
stryd_one Posted March 25, 2007 Report Posted March 25, 2007 Oh... That's assuming that you already checked thoroughly with the soldering and schematic to make sure the circuit is ok. Quote
Dave_Wheeler Posted March 29, 2007 Report Posted March 29, 2007 Have you confirmed the LED's are connected correctly as they are polarized. The Anode MUST be positive and the Cathode at about 0V.A quick test can be made with a spare LED5V-----------560R--------(A)LED©-----------0VThe resistor can probably be as low as 180R (based on 20mA and FV of 2.0) but to test a 560 is goodOn most (all ?) LED's the 'flat' on the LED body is the cathode and the long lead is the Anode.Dave Quote
stryd_one Posted March 29, 2007 Report Posted March 29, 2007 Hey that sounds like a good idea. I had a feeling this might be an error in the circuit, and if the LEDs are all backwards they'll stop the midi from working... Quote
whomper Posted March 29, 2007 Author Report Posted March 29, 2007 Just reversed the LEDs and now MIDI flows out thru and the power led is working.I am not getting any MIDI in yet though :-(Whomper Quote
stryd_one Posted March 30, 2007 Report Posted March 30, 2007 Great news, 10 points to Dave_Wheeler! :)Time to go back to the MIDI Troubleshooting... Quote
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