I am not an expert in FreeRTOS or the ESP IDF but I have dabbled a bit. I was building my RBOT project around the ESP32 (here,here). I thought about shifting to an RPi ZeroW but then I got busy. I changed jobs and have focussed more on cloud-side.
A while back on twitter John Lee of Espressif tweeted that he had some samples and I was lucky enough to get one. At the time, I was not sure what it even was - but a new chip from Espressif is something I definitely wanted to play with!
The new ESP32-C3 is basically an ESP8266 killer. It’s cheaper, and it’s more powerful! It’s not really available yet but it looks like it’s only $1.80 while the ESP8266 is $1.84. The Hackaday article has a ton about it.
What’s really good about this is that the toolchain is the same as for the ESP32 - and one can assume that Espressif will probably extend their AWS FreeRTOS IoT support to this chip like they have for the full ESP32. But in the meantime I just wanted to get familiar with the chip and the toolchain.
The docs don’t cover this yet - after all, the boards are still sample only. But, looking at the schematic I could see that the LED was wired to GPIO8. I looked around for libraries to drive it and one blog mentioned that the example folder had some code for an LED strip. So I looked:
ls ~/esp/esp-idf/examples/peripherals/rmt/led_strip/ CMakeLists.txt components main Makefile README.md
Out of the box it’s not going to work. I copied that folder into ~esp and then did
Select “Example Configuration” and make these changes:
(8) RMT TX GPIO (1) Number of LEDS in a strip
Remember, the LED is on GPIO8 and there’s only one.
idf.py build idf.py -p /dev/ttyUSB0 flash
And suddenly I am almost blinded by the light!
Now it’s time to get serious and do some more reading and playing with FreeRTOS!