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I have a ATSAM4SD32B dev board, which is connected to my laptop via USB. I also connected the board to a JTAG debugger/programmer. When I try to query the Device signature, I get the following error message:

19:29:18: [ERROR] Error connecting to device over JTAG, ModuleName: TCF (TCF command: Device:startSession failed.)
19:29:18: [WARNING] Read voltage 0.0V is outside selected device's operating range: 1.6 V to 3.6 V.

Atmel Studio Device Programming Window

I looked in the user manual, and it says if the board is not connected, I would see zero voltage. But the board is connected to the USB port of my laptop; so is the JTAG. They are connected to two different USB ports. The manual also advised to run JTAG commander, which I did. What give?

The manual stated to run JTAG commander a couple of times and I did. I just noticed that the last message stated to connect. But I am stuck at the point you see in the pick. I am not sure what it means, or what to do with it.

I measured the voltage on pin 1 and pin 2, and it was zero. There was some noise around .01 volts and .09 volts, but that is it. Here is a schematic of the JTAG interface from the board's documents: JTAG interface pinout

enter image description here

share|improve this question
    
Have you measured the voltage at the "VCC_TARGET" or similarly named pin of the programmer? – uint128_t Feb 29 at 1:15
    
I measured the voltage and it was zero. I did it when JTAG was not connected to the board assuming that JATAG was the receiver and the power source would be the board. What do you think? – user3326293 Feb 29 at 18:54
    
That pin is used by the programmer to set I/O voltage levels. What does it measure when the programmer is connected to the target? – uint128_t Feb 29 at 19:00
    
I will have to go to another location to measure again. I found some new information; schematics about the JTAG interface on each side. Let me measure again, and I'll respond as soon as it is done. – user3326293 Feb 29 at 21:13
    
I just updated the main body of the post with the results. – user3326293 Feb 29 at 22:14

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