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J-link not find device(Info: Could not measure total IR len. TDO is constant high.)

steven

Dear all: Now,i have issue ,i can't fund device.(i have sure the hardware is OK) i think it is program overwrite the J-TAG register(TDO)? but i may not sure. have any experience about this error?

i try run J-Link commander to clear ,but

J-Link> r Info: Could not measure total IR len. TDO is constant high. Reset delay: 0 ms Reset type UNKNOWN: ??? Info: Could not measure total IR len. TDO is constant high. J-Link>r

****** Error: TCK (pin 9) low, but should be high. Please check target hardware. Reset delay: 0 ms Reset type UNKNOWN: ???

and i exe nrfjprog --recover to

it get C:\Users\steven>nrfjprog --recover Applying pin reset if debugger is not active. System off disabled until pin reset or power on reset is done. Halting device. ERROR: Cannot connect to the nRF51 device.

the nRFgo studio is also not found any device .(In the boot of the moment, nRFgo maybe detect the device) read back protected or not found device.

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    To answer the original question here, it seems that the J-Link Lite for some reason can't find the nRF51822. This can be caused by a number of things, for example:

    1. The nRF51822 being in system off (in this case, you should still be able to make things work by doing a recover, so this is most likely not the case here.)
    2. The connector being wrongly connected (i.e. turned 180 degrees or similar).
    3. The VTG of the connector not being connected to the nRF51822's VCC.
    4. The VCC of the nRF51822 being outside of what's supported by the J-Link Lite. The J-Link Lite can only program devices running on 3.3 V. The voltage of the nRFgo motherboard can be set in nRFgo Studio. 5a. If you use version 1.0 of the Evaluation Kit, the jumpers on P8 either not being mounted or turned 90 degrees. 5b. If you use version 2.0 of the Evaluation Kit, the J-Link OB switch being off.

    Could any of these be the problem here?

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  • 0

    To answer the original question here, it seems that the J-Link Lite for some reason can't find the nRF51822. This can be caused by a number of things, for example:

    1. The nRF51822 being in system off (in this case, you should still be able to make things work by doing a recover, so this is most likely not the case here.)
    2. The connector being wrongly connected (i.e. turned 180 degrees or similar).
    3. The VTG of the connector not being connected to the nRF51822's VCC.
    4. The VCC of the nRF51822 being outside of what's supported by the J-Link Lite. The J-Link Lite can only program devices running on 3.3 V. The voltage of the nRFgo motherboard can be set in nRFgo Studio. 5a. If you use version 1.0 of the Evaluation Kit, the jumpers on P8 either not being mounted or turned 90 degrees. 5b. If you use version 2.0 of the Evaluation Kit, the J-Link OB switch being off.

    Could any of these be the problem here?

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