NRF5340 application in RAM

[dev_j]

Hello,

I want to have 2 applications running on nrf5340 CPUAPP (nothing on CPUNET) with app1 in flash and app2 (in RAM) getting launched by app1 once placed in RAM as a binary file.
app1 has a int sum(a,b) function that I want to use in app2. I am looking for documentation or guidance on how app2 can access functions from app1 or how to configure both applications to make this possible. One more idea is to build app2 in c instead of zephyr ncs2.6.0 that app1 is using to reduce the size of app2. Any ideas?

Thanks,
dev

[Turbo J]

CCC r0ket did this and is open source on github.

Basic idea was an array of function pointers at a fixed address in flash that the RAM program can call into. Won't save you much flash space though - I recommend using external flash chip if internal flash was not enough.

[dev_j]

Turbo J Thank you for replying, do you happen to have a link? I can't see it with a quick google search.

[Turbo J]

Its been a while since 2011: https://github.com/r0ket/r0ket

Note that the MCU is not a nordic product - but its an ARM Cortex-M variant at least.

Not easy to translate into a nordic SDK without major changes.

[dev_j]

Thank you, will look through.