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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32


sprintf call causes STM32L4xx to crash

First - use snprintf() instead of sprintf(). While THIS example with THIS specific value (101) will not overflow your 5 byte buffer, it is a good habit to get in to. For example:

sprintf( Holding, sizeof(Holding), “%i”, Input );

Second - can you be more specific about what “crash” means? Does your code end up somewhere you don’t expect, like a fault handler? Note that by default, all fault handlers are simply an empty loop, which usually ends up as a “jump to self” instruction in the startup code just after the call to main(). You may need real code in your fault handlers, or at least a breakpoint so you can inspect the fault registers to see what caused the fault.

Is that code snippet you showed us REALLY the entire function? Or is there more to it?