how to read MAC ID of nrf52832 using python and adalink

RE: how to read MAC ID of nrf52832 using python and adalink

msliv — Fri, 18 Mar 2022 08:49:55 GMT

Much appreciated!

If anyone works with Python feel free to use following code to format MAC printed in console to "aa:bb:cc:dd:ee:ff"

#getShellStream is built based on subprocess lib
data = getShellStream('nrfjprog -f nrf52 --memrd 0x100000A4 --n 8')
# Arrange messy raw data from memory
addr = (data.split(' ')[2] + data.split(' ')[1])[4:]
# Create list of bytes and append 0x to each one
hexList = [f'0x{addr[i: i+2].lower()}' for i in range(0, len(addr), 2)]
# First byte of address is bitwise or'ed by (0b1100 0000)
# Bluetooth Core v4.0, Vol 3, Part C, chapter 10.8.1.
hexList[0] = str(hex(int(hexList[0], 16) | 192))
mac = ""
for byte in hexList:
    # Add ':' and remove '0x'
    mac += f'{byte[2:]}:'
# Remove last ':'
return mac[:(len(mac) - 1)]

RE: how to read MAC ID of nrf52832 using python and adalink

Jørgen Holmefjord — Thu, 17 Mar 2022 15:46:07 GMT

As described in the post I linked:

"The reason why "A7" becomes "E7" is because the specification says that the 2 MSBit of the address must be set '11' (if you're very interested, see Bluetooth Core v4.0, Vol 3, Part C, chapter 10.8.1.)"

In your readout, the second last byte "0xBA" (0b10111010) will become 0xFA (0b11111010).

RE: how to read MAC ID of nrf52832 using python and adalink

msliv — Thu, 17 Mar 2022 15:18:44 GMT

I have used this command with PCA10040 programmer targeting external (connected) NRF52832, please look what I have found:

Raspberry Pi has found my device which was discoverable at the moment with MAC addr:

FA:98:48:56:7B:82

After issueing:

nrfjprog -f nrf52 --memrd 0x100000A4 -n 8

Nrfjprog returned:

0x100000A4: 48567B82 908EBA98

If you take a closer look there is a pattern in which bytes are found... except for the first byte, the 'FA' cannot be found anywhere. None bytes near this address contain 'FA'.

I am also interested in fetching MAC addr using JLink.

RE: how to read MAC ID of nrf52832 using python and adalink

Jørgen Holmefjord — Thu, 17 Mar 2022 09:57:14 GMT

If by MAC ID you mean the numbers in the FICR->DEVICEADDR registers, you can read those using the following command:

nrfjprog --memrd 0x100000A4 --n 8

The softdevice will use these registers for setting the default address, but this may be changed by the application. See this post for more details. Other protocols may use the registers differently, or not use them at all.

RE: how to read MAC ID of nrf52832 using python and adalink

nikita_k — Thu, 17 Mar 2022 03:49:41 GMT

hello,

thanks for answer. Can you share documentation about how to use these tool to read MAC ID

RE: how to read MAC ID of nrf52832 using python and adalink

Jørgen Holmefjord — Tue, 15 Mar 2022 12:52:15 GMT

Hi,

Adafruit_Adalink project is not developed or supported by Nordic. You need to reach out to the developers of the project to get help with any issues you may have.

If you are using J-Link, you can use nrfjprog from nRF Command Line Tools to read the DEVICEADDR[n] registers.

Best regards,
Jørgen

RE: how to read MAC ID of nrf52832 using python and adalink

nikita_k — Tue, 15 Mar 2022 06:41:27 GMT

i have done the following process for installation

install Python 2.7.13.
add their path to environment variable
run python command to check proper installation
download Adafruit_Adalink project file
unzip in python 27 folder
then run python setup.py install command
obtained response is