Hi folks,
My Uno R3 with USB Host shield drives me crazy. The Host shield is one of these with circuit@home compatibles with solder bridges for VBUS power selection of 3,3V or 5V.
In my project I will connect a small USB-MIDI Controller (send) to an legacy MIDI Device (receive)
After soldering the 3 bridges (3,3V and 5V to Host shield and 5V to VBUS), connecting an external power supply and upload of the USBMIDI_converter sketch my setup works correctly. But this won't happen every time. I have tried a different sketch and rolled back to the working one with the same hardware setup but the USB-MIDI Controller did not come up and it looks like insufficent power because of no flashing power LED in the controller. I've doublechecked the wiring and power supply but nothing happens. For troubleshooting purposes I've disconnected all cables, did an upload again an connected the cables back. At this point my setup was working correctly again. But after a powercycle of the UNO my MIDI Controller was "dead" again and now im not able to bring it back to life.
The board_qc sketch quits with:
Circuits At Home 2011
USB Host Shield Quality Control Routine
Reading REVISION register... Die revision invalid. Value returned: 00
Unrecoverable error - test halted!!
0x55 pattern is transmitted via SPI
Press RESET to restart test
Had anyone an advice for me for further troubleshooting?
Thanks a lot
Neno
UPDATE:
Shortening D7->RESET was not the solution for my problem
UPDATE2:
With shortned D7-RESET, redploy of the sketch an using Yubikey as first USB Device before plugging in the MIDI Controller worked for the moment... I'll keep testing.