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Failure to loadfile binary to my PCB w/ nRF51822 using nRF51 DK Debug Out

i_am_trying

I have built a PCB that uses the nRF51822 . I am failing to load the binary onto the chip via the nRF51 DK. I can:

connect to the nRF51822 on my mac using the JLinkExe.

execute the erase command in JLink I have a small binary called LED_TEST.hex that I attempt to load. No matter how many times I run loadfile, I get the message:

Downloading file [LED_TEST.hex]...Info: J-Link: Flash download: Restarting flash programming due to program error (possibly skipped erasure of half-way erased sector). Info: J-Link: Flash download: Skip optimizations disabled for second try. Error while programming flash: Programming failed.

I'm looking for ideas on how to best debug this. I have a file that I logged the SWD traffic into. I am new to SWD traffic, and there are A LOT of records...so i'm not sure where would be the best place to focus within the SWD traffic in order to tip me off why this is happening. Here is the log file: LBL_SWD_loadfile.txt

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    Are you sure that "debug out" is really active on your nRF5x DK? There must be certain PINs shorted beside plugging all 4 or 5 wires (depending if you provide 3V3/5V power from DK board or separately). I'm using both nRF51 and nRF52 DK boards to flash custom boards with nRF51x22 chips and it works flawlessly (using nrfjprog or SEGGER J-Flash). In my case I simply connect PINs 2 and 3 on P20 header (VIO to SH_VTG).

    Cheers Jan

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  • 0

    Are you sure that "debug out" is really active on your nRF5x DK? There must be certain PINs shorted beside plugging all 4 or 5 wires (depending if you provide 3V3/5V power from DK board or separately). I'm using both nRF51 and nRF52 DK boards to flash custom boards with nRF51x22 chips and it works flawlessly (using nrfjprog or SEGGER J-Flash). In my case I simply connect PINs 2 and 3 on P20 header (VIO to SH_VTG).

    Cheers Jan

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