Bare metal GPIO driver for ESP32 | Toggling an LED

In this video, I write my own GPIO driver for the ESP32 microcontroller, instead of using the provided ESP-IDF headers. All memory addresses are pulled directly from the Technical Reference Manual.

[Technical Reference Manual]

[Source Code]

[turboimport]

Man this was dope, explanation was great. Most people just blow right over stuff like this like its nothing.

[zaca]

Holy crap that was simple. I just switched over the Espressif framework from Arduino and I've been messing around with their GPIO driver for a couple of hours now. Considering all I needed to do was toggle the internal LED, this saves so much hassle.

[tjwatts]

Very useful: thanks. Great for ULP programming where there's no other option.

[alexclarosfernandez]

Your videos are great!!!
Thanx a lot for your time and effort!!!

[matsvandamme]

Nice video. Please note that GPIO_OUT_W1TS_REG and GPIO_OUT_W1TC_REG are exposed in soc/gpio_reg.h so a simple #include is sufficient, no need to define these registers inside your code. Please also note that GPIO pin numbers are exposed in hal/gpio_types.h. Same comment, no need to define GPIO5 macro again.

[fadieid]

Great stuff, arw you willing to continue the series? I am looking for a bate metal approach to the ESP32 instead of the typical arduino core use. What topics are you looking to cover?

[aslambasha]

Can anyone give insight on how to read GPIO pin such as button and control LED foe ESP32.

[skanderbelhaj]

man writing code like its native language

[msbanda]

If you using FreeRTOS, it’s not bare metal, right? 😂

[PatrioticGestalt]

I tried reading the same document to see how you came about your awesome simplicity. What made you decide to avoid setting the GPIO_FUNCx_OUT_SEL register?

[jeanfernandeseng]

When this code is executed on ESP32, Is there some FreeRTOS tasks at under kernel ? I am trying to check a gpio from external source and send to serial, and the FreeRTOS under IDF sometimes run task like IPC and move the context of execution. I watched the video and I dont understand why you move to linux. Does it possible under windows create a Real Bare Bone code ? Thanks in Advance.

[bobweiram]

The moment you included the RTOS and linked against IDF's libraries, it's no longer bare metal. All you did was bypass the GPIO functions. What a waste if time.

[grenadier]

The next step is write your own linker script