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[SOLVED] FEZ Domino does not boot when mode pins are shorted


#1

I’m trying to enable the mass storage capability of the fez domino. I soldered a switch with a 10k resistor between the mode pads. When the resistor is switched out everything works fine. I can deploy my application and debug via USB. When I switch the resistor in and reboot the fez it doesn’t boot my application. Has anyone ever seen this type of behavior?


#2

It is probably an exception that you are not seeing. Use serial debugging to step in your code


#3

How does changing the debugging mode cause an exception? I have a simple bit of code that makes my device beep at the very beginning of my application and it isn’t doing even that. It works fine in USB debug mode. I guess I don’t understand how changing the debug mode could cause an exception immediately.


#4

Is your uart RX pin left floating? Noise coming in will cause problems. Try pull up or pull down


#5

Gus,

Good thought. I’ll check it out and let you know. Like always thanks for the help.

Dean


#6

I don’t use a resistor on the Panda ! I just ground out the mode pin.

Cheers Ian


#7

Gus,

That did it. Thank you so much. I was going crazy on that one…should have realized that the COM1 pin would be floating. Works like a charm now.

Dean