ESP 32 is fa.........st

[ebclr]

Quick reply without calculating

What will be signal frequency on output5, on a standard esp32 board using Arduino and espressif


void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite( 5,HIGH );
//  delay(100);
  digitalWrite( 5,LOW );
//  delay(100);
}

[cowana]

No idea!

But if a 16MHz ATMEGA328 manages about 200kHz with the bloat of digitalWrite, I'd expect somewhere around 3MHz from an ESP32 running at 240MHz?

[ebclr]

Amazing 3.65 Mhz

[daybyter]

How fast is analogRead ?

[Bruce Abbott]

if a 16MHz ATMEGA328 manages about 200kHz with the bloat of digitalWrite,

Or, without the bloat...

Code: [Select]

.include "m328def.inc"
 ldi  r16,1<<5
 out  DDRB,r16
loop:
 out  PINB,R16
 rjmp loop2.67MHz (3.33MHz @20MHz)
 

[sleemanj]

It's no secret that the pin operations in the Arduino main core are very bloated and slow.

Frustratingly it would be possible to refactor the functions (pinMode, digitalWrite, digitalRead...) a bit and use some GCC compile-time magic to make serious optimisation for constant (compile time known) arguments such that a digitalWrite or pinMode for example would be optimised down to a single sbi or cbi instruction, like I did for my ATTinyCore fork

But I think any such pull request on the main arduino core would probably languish in the pit of "oh but it might break [insert random thing that a developer happens to use] which was relying on the slowness".