specific unique id for device detection

[capricorn]

Hi

I am looking for unique id of nrf52. is there any to set or generate unique id throughout all nrf52 devices.

Thanks & Regards Paramvir Singh

[butch]

The FICR contains one.

// But only use LSB six bytes
define MAX_DEVICE_ID   0xfFfFfFfFfFfF

// FUTURE use a 48-bit bit field


DeviceID myID() {
/*
 * NRF_FICR->DEVICEADDR[] is array of 32-bit words.
 * NRF_FICR->DEVICEADDR yields type (unit32_t*)
 * Cast: (uint64_t*) NRF_FICR->DEVICEADDR yields type (unit64_t*)
 * Dereferencing: *(uint64_t*) NRF_FICR->DEVICEADDR yields type uint64_t
 *
 * Nordic doc asserts upper two bytes read all ones.
 */
uint64_t result = *((uint64_t*) NRF_FICR->DEVICEADDR);

// Mask off upper bytes, to match over-the-air length of 6 bytes.
result = result & MAX_DEVICE_ID;

assert(result <= MAX_DEVICE_ID);
return result;
}