SWD Disconnect Susceptibility

Question

Is the nRF51822 susceptible to being bricked if the programming port is accidentally disconnected during programming? Does it use any protective measures such as a checksum?

Asbjørn · Accepted Answer

If the programming procedure is interrupted/aborted the FW on the nRF51 would not be correct and your application wouldn't run as expected. It will not brick the nRF51 more than you would have to program it once more, but the nRF51 will still be able to be programmed again. So from a programming point of view the chip is not bricked, but from the user of the nRF51 the device will seem to not act as normal since the FW wasn't uploaded correctly. 
 It's a standard ARM SWD interface.