MiOS not recognising stm32 / MIDIbox NG issue

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Hi all, the core was recognised in MIOS Studio when I uploaded the MCSequence app fine. I got to testing the JA PCB with MIDIbox NG, uploaded the midibox MG script ( SEQ_L.ngc ) on the SD card then flashed MBHP_CORE_STM32 -> project.hex.
The progress bar completed but the core is no longer recognised by MIOS studio. I can see the core is receiving power and the SD card reader led does flash when connected to the computer but no luck connecting again.

I’ve double checked that the selector on the back is still set on USB and the core boot config switch is still as flash and also used another USB cable to rule that out. I’m using MacOS 10.15.7 with MIOS studio.

Any tips on where to start with troubleshooting? Should I try mounting the USB port from the core module to t/s or reinstall something?

cheers
Adrian

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Hi Adrian,

first thing to check:
MacOS caches your USB MIDI ports, to see the new virtual USB MIDI devices after a firmware upload, please perform these steps:

start the Audio-MIDI-Setup of MacOS (e.g. search for “audio-midi” with Spotlight)
disconnect the core module from USB
delete the interface in the Audio-MIDI-Setup
connect the core module to USB again

Do you see new MIDI devices after that procedure? (Close and restart MIOS Studio for that).

If it still does not work, you could also try to reflash the App via STM32CubeProgrammer (an app for MacOS) using a mini USB cable connected directly to the Waveshare core module. For this to work, the power switch on the module must be set to USB instead of 5V. STM32CubeProgrammer should then see the core and you could try to flash the .hex

Best regards,
Peter

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Hi Peter,
Thanks for the reply. I tried the suggested method of deleting from the audio-midi setup then tried reconnecting with the same machine along with another Mac with Monterey installed and still no response.

I tried installing the suggested STM32CubeProgrammer and setting the Waveshare to USB but the OS didn’t let me install the app for some reason.

I then installed STM32CubeProgrammer to a windows 10 computer but it doesn’t seem to be recognised there either unfortunately. USB lights are flashing when connected but Waveshare does not connect to the STM32CubeProgrammer.

Any other tips?

Thanks in advance for your assistance

Cheers

Adrian

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@Drox i think the previous flash was corrupted - did you per chance flash the STM32F1 and not STM32F4 hex file?

If so (or if the flash was interrupted, i.e. due to a bad USB cable, power supply problem or “unplugging”), you’d need to use an ST-LINK V2 programmer (the original one from ST Micro) and attach the contained 16-pin JTAG cable between programmer and your core, then start STM32CubeProgrammer again, select the Programmer and flash.

It’s not expensive and is very useful for any (later) STM32 based DIY projects - highly recommended:
https://de.farnell.com/stmicroelectronics/st-link-v2/programmierer-icd-f-stm8-stm32/dp/1892523?ICID=I-RP-STM7REC-2
(Also be aware of cheap clones - these often are of bad quality or don’t come with the required 16-pin programming cable).

Once you’ve obtained the Programmer, here’s @Phatline s very nice video how to “unbrick” your core - in this video it’s shown for the LoopA, but it’s identical for any core:

It should not be too problematic once you have access to a programmer - and you can use STM32CubeProgrammer for your Mac.

Best regards,
Peter

PS: Just saw that Farnell is out of ST-Link V2s, but they should be available from other sources.

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Thanks! I’ll give that a try.

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good news! I was able to source an ST Link V2 locally and followed the unbrick process in the helpful video you shared.

I do have another question when getting to the part when I load the script from the SD card.
I’ve got back to the part where I run seq_l but get an error in MIOS Studio:
[MBNG_FILE_R] /seq_l.NGR (optional run script) not found.
I do see on the previous line in MIOS Studio indicates that the file loaded from the SD card and I reformatted the card via windows to FAT32. It’s a VERBATIM micro SD HC class 10 4GB. Could that be the issue or maybe the cable to the SD card board is faulty?

I also tried reflowing and double checking the SD card board for shorts but no change. It’s like the file isn’t successfully loading maybe? Will try making another cable to test with.

Thanks in advance for your assistance

Adrian

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@Drox cheers, well done with the programmer!

Note that some MBNG scripts come with both a .NGC and .NGR (config and run script file) and that loading the config will also try to load the run script - if the run file is not present, you get this error message that can be ignored.

Here’s a screenshot from the video tutorial showing i encountered the same message 🙂:

So as long as your screen reads “Patch ‘seq_l’ loaded from SD Card”, your SD card is nicely working.

Best regards and enjoy the build!
Peter

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Hi Peter, Thank you for pointing that out! I missed that little detail in the video.