How to identifier nRF51 SoC chip?

[wen jin zhang]

I try use the FICR information to identifier nRF51. but found some interesting staff when i read 0x10000000 first 16 bytes by SWD memory read. when I power on read. it return all 0x00. but i restart SWD debuger read again. it will return 0xAA 0x55 0xAA 0x55 0xAA 0x55 0xAA 0x55 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF

and CONFIGID also same.

do FICR be RTL? why could be changed, ? is there has fixed area can be used as identifier?

[Susheel Nuguru]

Not sure why you were reading 0x00's but the FICR is permanent device and calibration data tuned for each chip, it will/should not change.

[wen jin zhang]

what is right sequence access the FICR? i check again. use swd_read_word(0x10000000, &tmp) function. and it return OK. but tmp value is 0x00000000 when power on. then no power off. then entry debug mode and read again. the tmp will be 0x55AA55AA.

The SWD init sequence is ok!