DevEUI before & after firmware update

nmcc · April 19, 2021, 11:19am

My MKR WAN 1310 arrived with the original 1.2 firmware on the Murata module which gave me the Arduino registered EUI (first three bytes A8:61:0A + sort-of-random based on MCU ID).

Updating using the v2 results in a totally random EUI starting 35:35:31, a prefix that isn't registered.

The GitHub source shows that the original code to create the original EUI is still in place:

github.com

arduino/mkrwan1300-fw/blob/b1c48b27280cb455ebe73f723e4a6cc01854d1f5/Projects/Multi/Applications/LoRa/AT_Slave/src/mlm32l0xx_hw.c#L353


      
             * clocks dividers

             */

            HW_RCC_ClockConfig();

          }

          

          uint32_t HW_GetRandomSeed(void)

          {

            return ((*(uint32_t *)ID1) ^ (*(uint32_t *)ID2) ^ (*(uint32_t *)ID3));

          }

          

          void HW_GetUniqueId(uint8_t *id)

          {

            // First 3 bytes are Arduino OUI A8-61-0A

            // Other 5 bytes are derived by STM32 internal ID registers

          

            uint32_t id1 = *((uint32_t *)ID1);

            uint32_t id2 = *((uint32_t *)ID2);

            uint32_t id3 = *((uint32_t *)ID3);

            uint32_t id13 = id1 + id3;

          

            id[7] = id13 >> 24;

So I suspect that the MKRWANFWUpdate_standalone file in v2 has a generic firmware embedded in it.

Does anyone have a release level with the correct HW_GetUniqueId function embedded?

anon45833125 · June 17, 2021, 7:00am

I'm noticing the same when using MKRWAN_v2. This is based on the 1.3.1 branch and not on the master branch. The file you're referring to is located in in the 1.3.1 branch:

github.com

arduino/mkrwan1300-fw/blob/master-1.3.1/Projects/B-L072Z-LRWAN1/Applications/LoRa/AT_Slave/Core/src/mlm32l0xx_hw.c

/*
 / _____)             _              | |
( (____  _____ ____ _| |_ _____  ____| |__
 \____ \| ___ |    (_   _) ___ |/ ___)  _ \
 _____) ) ____| | | || |_| ____( (___| | | |
(______/|_____)_|_|_| \__)_____)\____)_| |_|
    (C)2013 Semtech

Description: Target board general functions implementation

License: Revised BSD License, see LICENSE.TXT file include in the project

Maintainer: Miguel Luis and Gregory Cristian
*/
/**
  ******************************************************************************
  * @file    mlm32l0xx_hw.c
  * @author  MCD Application Team
  * @brief   system hardware driver
  ******************************************************************************

This file has been truncated. show original

The ID's seems to be hard coded and I suspect all the devices using MKRWAN_v2 will have the same EUI. Need to double check this.

Beside this MKRWAN_v2 claims to track the 1.3.1 branch, but the reported fw version after upgrading it states 1.3.0. So, quite confusing.

system · October 15, 2021, 7:01am

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DevEUI before & after firmware update

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