ESP32 Forum

hydrabus wrote: 1) A way to Count Leading Zeros of a 32bits unsigned integer
Does such feature exist on ESP32 CPU ?

ESP_igrr wrote: Yes, using NSAU instruction. Compiler will generate it if you use GCC __builtin_clz() intrinsic.

Thanks for the hint and the fact it support asm instruction for that I will test it later to check it generate the right asm code...

hydrabus wrote: 2) In a near future write an IDA Pro Processor Module for ESP32 (as only ESP8266 is supported ...)

ESP_igrr wrote: I have extended the 8266 ida-python plugin with some of the ESP32 instructions (not added FP yet) and am using it personally in day-to-day debugging using ScratchABit disassembler. I can share what i have if you want to work on this.

Could you share your plugin ?
My email is bvernoux at hydrabus.com

hydrabus wrote: 4) A way to retrieve number of cycles executed (with accuracy of CPU clock so 240MHz) on 64bits if possible (but I can survive with 32bits), CPU cycle counter (like on ARM CM3... => DWTBase->CYCCNT) is perfect for that (even if timer can be also used ...)

ESP_igrr wrote: 32-bit CPU cycle counter can be queried by reading CCOUNT special register, or equivalently, using xthal_get_ccount function defined in Xtensa HAL.

Thanks for the hint I will check that

hydrabus wrote: Could you share your plugin ?
My email is bvernoux at hydrabus.com

I've sent you an email.

ESP_igrr wrote:

hydrabus wrote: Could you share your plugin ?
My email is bvernoux at hydrabus.com

I've sent you an email.

Thanks for all I have replied to your Email

Has there been an update on the assembler language reference manual availability?

Hi
Any news about the availability of the assembler language reference manual for ESP32?

Still no change in status, unfortunately...

So will this ever happen?

It's unlikely that the official Cadence docs ever see a non-NDA-encumbered release... but there is information out there in the form of the compiler etc. We've tried to compile all this publically available info into one one file. It's a bit terse, bit I think it should be helpful when you decide to write assembly.