I'm using a Brain Jr in a DAW PC with an ASUS Z170 WS motherboard and Win 10 Pro 64Bit. The Brain Jr has version 1.0.3 written on the PCB and the firmware version is 2.08. I have built in the Brain into the PC and connected it to an internal USB port of the motherboard.
Problem: when I power-up the PC, the Brain does not always start-up correctly, which results in non-function of the device:
- no communication with the PC via USB possible anymore
- no transmission of MIDI data when applying input signals
- sometimes, the blue LED goes off after start-up, then the device never works
- sometimes the blue LED stays on, but the device is still not working
The same problem occurs, when I connect the USB cable to the Brain Jr after power-up of the PC. The problem seems to happen randomly but unfortunately quite often, means in approx. 30% of all cases.
I also tried to update the firmware, but this does not work either. I short-circuited the two first pins of header JP5 (as requested in the wiki) and powered up, but Brain does not go into firmware update mode. I also read about this update problem in this forum and it seems that I have the same issue.
I figured out that on the JP5 / pin 5 there is the master clear reset (MCLR) of the PIC18F66J50 controller. The MCLR provides a method for triggering a hard external Reset. The blue LED goes off when tying pin 5 to ground, but the Brain does not start-up properly afterwards. It seems to be more complex and maybe it's even a timing problem. This would explain that sometimes start-up works and sometimes not.
Any help is much appreciated! I really worry about building up my whole equipment with another MIDI controller again...
Many thanks & best regards