How to invoke a MP callback function from Native MPY driver?

[haldark]

Hello,

I am planning to write HSPI Slave for ESP8266 as a MP module. The code is written in C and will follow Arduino esp8266 implementation. The code will be then compiled as a Native dynamically loadable module (.mpy), that can be loaded using "import".

The Arduino C code fires few interrupts when slave receives data or status transactions. These interrupts invoke C callback functions and pass pointer to a 64B long receive buffer. The callback function processes content of this buffer.

My main python code allocates a 64B buffer/array. I want my python code to pass python callback function, along with this buffer pointer.

When interrupt fires and invokes C callback function, they will copy content from C buffer to Python buffer and invoke python callback function.

I was looking in example/natmod directory for some reference code, but could not find any example to show peripheral interrupt from C world calling function of python world.

Is there any driver in micropython repository that I can refer to?

Any help, with some example code will be much appreciated.