how to determine nRF51822 laser mark

RE: how to determine nRF51822 laser mark

Ole Morten — Wed, 31 Jul 2013 06:44:09 GMT

This sounds a little strange, but good thing if everything works correctly with the latest softdevice!

As mentioned, I'd be happy if you could mark an answer as accepted, to clearer for later users.

RE: how to determine nRF51822 laser mark

Sam Wei Quan — Tue, 30 Jul 2013 22:37:33 GMT

I have solved this problem with the latest s110 SDK programmed. Now it able to select nrf51822_xxaa_s110 as target chip. When i programmed it with s110 SDK v5.1, there was a weird situation. When i testing with existing examples, some examples unable to select nrf51822_xxaa_s110(256K) as target chip.

RE: how to determine nRF51822 laser mark

Ole Morten — Tue, 30 Jul 2013 10:43:05 GMT

This comment doesn't seem to be quite correct. Please take a look at my answer below, and if you find it clear, I'd be very happy if you could mark this question as not resolved, and then instead accept my answer below. This would make things clearer for possible other users referring to this question. Feel free to post a comment on my answer if anything is still unclear.

RE: how to determine nRF51822 laser mark

Ole Morten — Tue, 30 Jul 2013 10:40:48 GMT

There is no difference between chips with the markings you've mentioned here, and both the "nrf51822_xxaa" and the "nrf51822_xxaa_s110" targets can be used on this chip. When to use which of these depends on whether or not you have the softdevice programmed or not. If you have the S110 softdevice programmed, it will occupy the lower part of the flash, and the target options in Keil must therefore be slightly different to avoid Keil trying to overwrite it. This is the difference between these two targets.

This means that if you have the softdevice programmed, you have to select the _s110 target while if you don't, you must select the target without the prefix.

RE: how to determine nRF51822 laser mark

Sam Wei Quan — Fri, 12 Jul 2013 07:21:14 GMT

Problem solved. N51822 QFAAC0 1308AE is old version nRF51822 chip. Select nrf51822_xxaa (256K) at target device for Keil uVision will able to program. nrf51822_xxaa_s110 (256K) is the latest nRF51822 chip.