ESP32 Forum

hi there,
I have some requirement to write some assembly code for ESP32. I have seen that we can do so for ULP co - processor . I am curious about dual cores of ESP32 . I am not able to find any good references for the same. Is it possible to write the code in c and assembly and run it. Any pointers would be helpful.
rgds,
DSPGRO

Yes, you can write inline or external assembly in the same way as you would for any other architecture where you use the gnu gcc etc tools. Unfortunately, the ISA of the Xtensa architecture isn't really documented in a document that we are allowed to hand out publicly (due to an NDA with Cadence) but if you Google well, you may find something.

Sorry to jump in here, but would you happen to know of cadence would be willing to sign an NDA with anybody willing to go through the process to get the ISA manual, or is reserved for paying customers only?

Yes, you can get Xtensa Tools evaluation package, which includes the documentation. See https://www.tensilicatools.com/platform/tensilica-sdk/.

(I don't know if they will talk to anyone or only to companies...)