DeviceOS 1.5.0-rc.1 - SoftAP using SDCARD - problem

[ScruffR]

Have you got your SPI calles wrapped in SPI transactions?

BTW, even when you have disclosed your used platform in some other thread(s) it's always good to mention that again in any new thread (or use the platform tags).

Could you also add a link or a quote to the "SPI issue" you are refering to for other readers to get the context?
I'll do that here for now

@avtolstoy

I have reproduced your issue and it’s related to our changes to have better thread-safety for SPI between system and application on Gen 3, however some changes affected Gen 2 devices as well. The key problem on Gen 2 devices is due to the undefined order in which the global C++ constructors are called ( STARTUP() macro creates an object in the global namespace with a constructor containing the code in the macro), the application-specific mutex for SPI class is not yet initialized at the point pinMode() is called in your STARTUP() macro and it needs to be for safety-checks on a pin configuration to be successfully made.

We’ll fix this in 1.5.0-rc.2. As a temporary workaround, please move any code that interacts with GPIO out of STARTUP() macro and perhaps into setup() .