dklinkman Posted March 9, 2015 Report Share Posted March 9, 2015 Got my board about a week ago, been playing around with it. Very slick. Question about the user switch though. Looking at the schematic I see one side of the SW1 switch connected to an FPGA input (O_L1N_VREF_1 or pin 104). And the switch is just switching between 1 and 0. And of course an FPGA output pin 139 connects to the AVR reset. On the blank circuit I remove the switch input ahead of the inverter and change it to a pull down (or pull up). At this point I expect the user switch to not be doing anything. Blink on the AVR is running fine with the pull down. Now when I move the switch either up or down, the FPGA restarts, even though I expect nothing to happen. Or I assume this because the USB port goes away then comes back, and the circuit is reloaded. The AVR restarts also. I just can't figure out why. I know there is a second side to the DPDT switch, but per the schematic it doesn't appear to be connected to anything. I must be missing something though, because the Duo definitely restarts when changing the switch. :confused: --David Quote Link to comment Share on other sites More sharing options...
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