Hi,

I am doing my first project (learning phase for now) with ESP WROOM 32. I am using ESPIDF framework on visual studio code, but I still consider a good practise to learn direct register operations, not only blindly using built-in commands (especially for GPIO). I have been reading the datasheet for quite some time, but I can not implement what is written there: https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
Page 52, 4.3.3 Simple GPIO Output (I tried to do this) The compiler treats register names as undeclared functions. I know that there is definitely a way to perform the direct register read or write somehow... Is it just my faulty syntax or do you have to dig deeper into the framework? I really hope that you still have the choice to use build-in functions and register manipulation as well. Thank you in advance for any help reaching the bare register directly...
My code:

#include <stdio.h>
#include <stdint.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

//I want to toggle GPIO pin 2

void app_main() {

    GPIO_FUNC2_OUT_SEL_CFG_REG = 0x100; //This step is provided in the datasheet
    
    while (1) {

        GPIO_OUT_DATA |= (1 << 2);
      
        vTaskDelay(1000 / portTICK_PERIOD_MS);

        GPIO_OUT_DATA &= ~(1 << 2);
        
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

 

Sorry, can't help you much. But here is another thread where you may find some more info:

You can also post your question to the ESP32 forum.

I am waiting for the first post moderator approval in esp32 forum However, that thread does not help me much, because they are discussing the process (I am not there yet...) The thing is that my register names are not even recognized by the compiler. All I need for now is just a few lines of code on how to actually call the register...

 

I'm not a esp32 programmer but in general, usually there is a need to include the register define header(s) for low-level register manipulations.
https://github.com/espressif/esp-idf/blob/master/components/soc/esp32/include/soc/gpio_reg.h
https://github.com/espressif/esp-idf/tree/master

 

https://vivonomicon.com/2019/03/30/getting-started-with-bare-metal-esp32-programming/
HAVE FUN This is not Arduino Blinky

 

I would suggest downloading and getting the ESP-IDF working outside of any of the IDEs that offer ESP support to start with.

https://docs.espressif.com/projects...ation-guides/release-5.x/5.0/peripherals.html towards the bottom of the page is REG_WRITE, REG_READ, etc... that all deal with direct register access.