I’m just throwing the last few bits of my mb6582 together but I’m having trouble loading anything over midi.
I got my four Pics from smash tv so they had the bootstrap loader and mios on them.
Mios studio sees the core and says application is running but when I try to upload any hex files, it times out.
I did the usual loopback tests and everything. The only thing I’ve noticed is that pin 20 on the 3 slave cores is sitting at 5V but on the Master it’s at ground.
So basically there’s a 5V drop across R9 on core 1 but not on all other 3 cores.
I’m using an E-MU 2X2 which I know others have had issues with. I’ve tried it in Windows 10, 7 and XP with no joy.
I’ve tested the optocoupler using this and it looks good.
I’ve also pulled out the three slave pics and all the shift registers and now pin 20 on the master is floating at about 1.3V.
I don’t want to go desoldering or reflowing anything yet. I spent hours doing it last week trying to figure out why my LCD wasn’t displaying anything and then as soon as I switched in a new LCD it was fine.
I think pin 20 is used for DIN, so it makes sense that it’s only used on core 1 (which is the core that works with the CS).
I would try to track down an alternate MIDI interface to see if that changes anything. As you note, it sounds like others have had issues with the one you’re using. A bad sysex implementation on your interface is ver likely to cause the symptoms you’re having.
