RAK3172 Problem

LPWAN Modules / EVBs RAK3172
1

This is an inquiry regarding RAK3172.

I used the previous version, but this time I am using RUI3 version (4.0.6).

At the time of purchase, the firmware version was 4.0.0, so I updated it to version 4.0.6.

The firmware was updated normally, but an issue occurred in several modules (6-7 out of 100)
where no output came out of the UART port when power was applied.

The upgrade was performed using the STM32 Cube Programmer.

I was wondering if there were any known bug reports regarding this phenomenon.
I’m also curious if there is a way to factory reset the internal settings.

2

For reference, if I change the RAK3172’s firmware to 1.0.4, the module operates normally.
However, after upgrading to RUI3 4.0.6, there is no output through UART.

3

Welcome to the forum @Audible

RUI3 is using as baudrate 115200, while the old firmware version used 9600 baud as default.
Did you change the baudrate for the connection to the module?

4

As I wrote above, I am using 100 modules, and problems occurred with about 6-7 of them.
Baudrate settings are correct.

5

Did you retry to flash the modules a second time with the STM32CubeProgrammer?

Did you flash through the UART or using the SWD interface?

6

I have upgraded the firmware via UART several times.
I am curious as to whether the problem may be caused by the settings used internally. So, I am wondering if there is a way to HW initialize the module settings. (Because the UART is not working, SW cannot do anything)
For reference, I have downloaded RUI3 and older versions of the firmware alternately several times. Each time, the old firmware operates normally, but RUI3 does not work.

7

In the case of the previous FW (ver1.0.4), it was configured as Boot + App, but RUI3 does not seem to be configured that way. Please check if this is correct.