Write MAC to OTP over RTT

RE: Write MAC to OTP over RTT

Vidar Berg — Mon, 30 Sep 2024 14:00:49 GMT

The registers are one-time programmable, so they can't be written to more than once. You can try writing this address to the second MAC address register.

RE: Write MAC to OTP over RTT

Roman Veselskyi — Mon, 30 Sep 2024 10:31:55 GMT

Vidar Berg thanks,

I have 1 more question regarding the MAC write operation.

I tried to use the next MAC f2:01:d5:50:6f:52

This is the command I send over RTT

 wifi_radio_ficr_prog otp_write_params 0x120 0x50d501f2 0x526f

But when I read values, I see that it shows another MAC

MAC0.ADDRESS = f0:01:d4:00:4e:02

rtt:~$ rtt:~$ wifi_radio_ficr_prog otp_write_params 0x120 0x50d501f2 0x526f
OTP Region is open for R/W

Finished Writing OTP params
rtt:~$ [00:22:05.303,131] <inf> otp_prog: mac addr 0 : Reg1 (0x120) = 0x50d501f2
rtt:~$ [00:22:05.303,741] <inf> otp_prog: mac addr 0 : Reg2 (0x124) = 0x526f
rtt:~$ [00:22:05.304,077] <inf> otp_prog: Written MAC address 0
rtt:~$ [00:22:05.304,077] <inf> otp_prog: Written REGION_DEFAULTS (0x154) : 0xfffffffd
rtt:~$ rtt:~$ wifi_radio_ficr_prog otp_read_params
OTP Region is open for R/W

...

MAC0.ADDRESS0 = 0x00d401f0
MAC0.ADDRESS1 = 0x0000024e
MAC0.ADDRESS = f0:01:d4:00:4e:02

MAC1.ADDRESS0 = 0xffffffff
MAC1.ADDRESS1 = 0xffffffff
MAC1.ADDRESS = ff:ff:ff:ff:ff:ff

CALIB.XO = 0xff
REGION_DEFAULTS = 0xfffffffd

rtt:~$

RE: Write MAC to OTP over RTT

Vidar Berg — Mon, 30 Sep 2024 06:27:57 GMT

Hi,

[quote user="Roman Veselskyi"]As I understand there's a way to set MAC from the firmware and not from the OTP as now I have only 0s there and it will not work.[/quote]

There is the CONFIG_WIFI_FIXED_MAC_ADDRESS Kconfig symbol that you can use to override the MAC address stored in OTP. However, this is intended only for testing purposes.

Only passive scanning is used for Wi-Fi locationing, so the MAC address will not be transmitted.

Best regards,

Vidar

RE: Write MAC to OTP over RTT

Roman Veselskyi — Fri, 27 Sep 2024 09:22:28 GMT

Hi Vidar Berg

Thanks, I already figure out that I did send command in the wrong order. Fortunately, I ordered 3 boards and blocked only one of them.

As I understand there's a way to set MAC from the firmware and not from the OTP as now I have only 0s there and it will not work. By the way we will use nRF7200 only for scan and WIFI location does it also require the MAC address?

I am using SDK 2.6.1

RE: Write MAC to OTP over RTT

Vidar Berg — Wed, 25 Sep 2024 13:30:28 GMT

Hello,

The arguments should be passed like this: 'wifi_radio_ficr_prog otp_write_params 0x120 0x23f4a7f8 0x06ce', without 'arg1=' and 'arg2='. I see that the protection bits were set after you ran the 'wifi_radio_ficr_prog otp_write_params 0x100 arg=0x50FA50FA' command, which unfortunately means the FICR can no longer be updated. Do you have another board you can test this on? Also, which SDK version are you on?

Best regards,

Vidar