Porting OpenAMP from STM32 library (demo project) to Klipper

We will use STM’s OpenAMP version for the project. It differs from original OpenAMP in low level parts - inter processor communication interrupts and registers.

What do we need for porting?

We will start with OpenAMP tty echo example. If this example works, it means linux in configured correctly.

We have to check if /dev/ttyRPMSG is created and if /sys/kernel/debug/remoteproc/remoteproc0/trace0 is created. If these 2 files are created, porting is successful and we can focus on removing HAL librareis and integrate code into Klipper.

Creting new project with STM32CubeIDE

What do we need to create new working OpenAMP project?

Creating new project with default settings

In main.c, include #include "openamp_log.h
In openamp_conf.h:60, uncomment #define VIRTUAL_UART_MODULE_ENABLED
On CM4 core properties, go under C/C++ Build -> Settings -> Tool Settings -> MCU GCC Compiler -> Preprocessor and add __LOG_TRACE_IO_. Without this, printf() doesn’t work.

Creating new, clean project (no settings enabled)

In System Core, enable IPCC for both cores and activate it.
When you activate IPCC, you can enable OpenAMP middleware. Enable and activate it.
After this, follow instructions under Creating new project with default settings