Bare metal GPIO driver for ESP32 | Toggling an LED

[@turboimport95]

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

[@isagumus1]

I really liked your step by step and clear explanation. You gained a new subscriber here. Thank you!

[@Fornicassaurus]

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

[@tjwatts100]

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

[@zaca211]

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.

[@matsvandamme1]

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.

[@aslambasha539]

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

[@phillipmaser132]

Wow! You got the documentation down. I will have to think about on this one. It seems like a lot for just an LED. What would it take to read analog values in and WIFI them out to thinkSpeak?

[@fadieid5638]

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?

[@openmarkand]

this is not bare metal as the dev uses esp-idf which incorporates bootloader, start linker script and so on. a bare metal approach would be to write a main, assembly file and use clang directly.

[@jackevans2386]

I gave up on ESP32 MCUs because I found it impossible to toggle any port pins fast enough and also to stop the OS from interrupting every 1ms. Do you know how to do this ? Or in other words, how many clock cycles does it take for you to toggle an I/O pin ?

[@AbuBakar-um5wc]

great video..but please try to explain more about things going

[@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.

[@msbanda2123]

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

[@skanderbelhaj2278]

man writing code like its native language

[@EasyElectronics2412]

😂😂😂

[@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?

[@EV_engineer]

For simply toggling an LED, GPIO_OUT_W1TS_REG and GPIO_OUT_W1TC_REG are generally easier to set up and offer greater flexibility. But if you have a specific hardware event that you want to use to trigger the LED, and you want to minimize CPU overhead, then GPIO_FUNCx_OUT_SEL might be more appropriate.

[@inderjitsaini9303]

@@EV_engineer Hello, Thank you for the video, it is very informative. Actually, I had the same question as well. So imagine I have two LEDs one is blinking the whole time and then the second LED will only blink when I turn the potentiometer (let's say that generates an interrupt). So, in the second case I will have to use GPIO_FUNCx_OUT_SEL?

[@jakewasowski1353]

Thanks bro

[@grenadier4702]

The next step is write your own linker script

[@wlcrutch]

Windows….yuck. I can’t watch a windows terminal 🤢

[@bobweiram6321]

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.