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SiNut
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Joined: 12/03/2015
Location: United States
Posts: 12

Posted: 05:18pm 28 Oct 2019

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I am building a battery management system using the STM32L452RET processor. It uses a NUCLEO-L452 board with an interface board that has analog, relay driver and CAN bus circuitry on it. The system will eventually run custom firmware. However the ARMmiteL4 provides a simple and quick way to check out the hardware and exercise the different interfaces. The latest version of ARMmiteL4 code (2019-05-09_041753) runs just fine and provides access to the analog and digital interfaces.

I built ten of these systems and have loaded the ARMmiteL4 code on them all. Everyone accepts the .BIN file and responds with the startup message and displays the �>� prompt. Six of the boards then accept my Basic test file and operate exactly as expected. However the rest accept a few characters of input and then lock up entirely with no further response. Sometimes they go as far as to accept the �XMODEM receive� command but then lock up during the transfer. In all cases a reset will bring them back with the startup message and �>� prompt only to lock up again after accepting a few characters. I have reflashed the ARMmiteL4 image after erasing the processors entirely but to no avail. I have also tried changing the baud rate of the console at the prompt, again with the same results.

All the NUCLEO-L452 boards were purchased in a batch and are the same revision number. All the processors have the same numbers on them. All the crystals on the boards are running at a frequency within a few hertz of each other. These NUCLEO boards behave in the same manner without my interface board attached.

My questions are:
- Has anyone else experienced similar behavior, running the ARMmiteL4 code across multiple copies of a system?

- Is there any reason the ARMmiteL4 code will not run on the STM32L452 processor? It appears to be built around the same core as the rest of the series.

- Is there a way I can get a copy of the ARMmiteL4 source code to delve into this mystery further? I guess this last question is really for PeterM.

I would appreciate any suggestions on how to get all the systems running consistently. The ARMmite environment is excellent for testing and quickly prototyping different algorithms and I would hate to give it up. Thank you.

-- Gurbir

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