nrfjprog Programming HEX

[dtt60]

Hi

A nrf52832 device board is programmed with the hex file using nrfjprog command as follow for two times,

In the first time programming, the device board is programmed with the hex file with the following command,
nrfjprog -f nrf52 -s 123456789 --verify --program test.hex --chiperase -c 1000
nrfjprog -f nrf52 -s 682183494 --memwr 0x00074000 --val 0x50515253 --verify
nrfjprog -f nrf52 -s 682183494 --memwr 0x00074004 --val 0x70717273 --verify
nrfjprog -f nrf52 -s 682183494 --memrd 0x00074004 --w 32 --n 4

Then, for the second time, the device board is programmed with the hex file with following command,
nrfjprog -f nrf52 -s 123456789 --verify --program test.hex --chiperase -c 1000
nrfjprog -f nrf52 -s 682183494 --memwr 0x00074000 --val 0x50515253 --verify
nrfjprog -f nrf52 -s 682183494 --memwr 0x00074004 --val 0x60616263 --verify
nrfjprog -f nrf52 -s 682183494 --memrd 0x00074004 --w 32 --n 4

Sometimes, after the second time programming, the result read from the command "nrfjprog -f nrf52 -s 682183494 --memrd 0x00074004 --w 32 --n 4" is 0x70717273 but not 0x60616263.
Would you have any ideas why the result read is 0x70717273 occasionally after the second time programming? 

Thanks

[Turbo J]

I don't see any error handling for your commands above. Is it possible that you just missed the write command error printout?

Nitpick: The chip erase commands use a different j-link serial number. That would mean the chips are not programmed and erased properly.