FreeRTOS on the Raspberry Pi Pico (RP2040) Part 5: Semaphores

[@DarylBCarr]

Very intersting. Looking forward to future FreeRTOS tutorials.

[@jamesdemaine2289]

Great video series, I am on the edge of my seat for the hardware interrupt video

[@NoOneYouKnow466]

Great video, congratulations on providing a very clear and compact explanation and examples. Looking forward for new episodes of this series

[@LearnEmbeddedSystems]

Many thanks!

[@WolGarm]

Hi! This tutorial series has been really helpful. Your explanations are so easy to follow, great work! Please keep going.

[@uffeibsen8872]

This is great !!! Would love to see more on this topic and maybe real life examples poshing this to the limit !!!!

[@edwardvidal6176]

Thanks! Using this video series I was able compile, debug and connect a pico running freeRTOS to a Raspberry Pi 3B+ running bare metal Ultibo. The pico is running a blinking led task and a 2nd task performing KLT & DWT. The processing task that (sends Sync & Ready 10 times each, recives 4160 bytes an image of 64 x 64 with CRC after each column, performs the klt-feature-detect finds 4 PCA Feature #0: (37.000000,29.000000) with value of 19844 Feature #1: (28.000000,39.000000) with value of 9270 Feature #2: (24.000000,29.000000) with value of 4393 Feature #3: (38.000000,39.000000) with value of 465), in addition a dwt lifting step with 4 levels of decomposition.

[@jameslibby5215]

I’ve been following this project because I’m using this pico in my senior engineering design class in university. I’ve just designed and ordered a custom pcb with the rp2040 on it and I’m excited to get it working and maybe moving from the arduino IDE to VS code and using FreeRTOS. I’d love a job in embedded systems or robotics. I’m a computer engineering student.

[@davidaguilera8608]

Please publish the SMP tutorial for FreeRTOS, I need it for my thesis project. Also: You Explain so well, keep going!

[@oguzkaganyagloglu103]

I've been following this tutorial and it is really great. You explain everything so clearly. I am looking forward to the freertos multiprocessing tutorial. Are there any updates on when to come out?

[@Pyrografpl]

Thanks, you inspired me to check FreeRTOS, I used it but actully not indepth.

[@yahmk3978]

Thank you!

[@electrocsj3461]

Muy buenos tutoriales, estaría bueno que hablaras sobre los mutex o los eventgroups

[@LearnEmbeddedSystems]

Mutexes are covered in part 4 of the tutorial series, check the playlist!

[@edwardvidal6176]

pshell and littlefs are now working as part of rp2040-freertos-project. Next step is testing xmodem transfers between pico and rpi4b. littlefs-test.txt on github provides on the steps to merge. Thanks for a great series of videos.

[@jimhorwitz9983]

Any update on SMP video? excited to see it...

[@edwardvidal6176]

Using 2 minicom shells connected to USB & Uart on pico. I as able to transfer files from raspberry pi with xmodem to pico. My rp2040-freertos-project at github user develone. My test-read-crc16 project includes several libraries (freertos lifting crc16 klt littlefs). In the doc/xmodem has several images. The text file doc/littlefs-test.txt has more information on build of my code.

[@edwardvidal6176]

Any updates on when a multi-core freeRTOS will come out. I am looking forward to it.

[@LearnEmbeddedSystems]

Sorry for the delay, it will hopefully be out in the next 2 weeks.

[@5mxg]

Now would be nice to compare rtos overhead for different techniques

[@LearnEmbeddedSystems]

I plan on making a video regarding memory management which will include overheads for different FreeRTOS functions, is this what you mean?

[@5mxg]

@@LearnEmbeddedSystems Yes, memory and CPU cycles overhead for thread switching, mutex checking/setting, queues etc. I wonder how different will it be on different CPUs. Some time ago FreeRTOS for 8 bit PIC was too bulky and as I don't like the 'memory and cpu is cheap so we can waste it'. So I made some own replacements for inter process communication and used more like coroutines approach. I wonder how it is now. Looking forward to next parts of Your current tutorial.

[@irenerose2879]

Have you done any work on the Arducam RP2040? It has a great deal of functionality on board. I personally would like to run/use FreeRTOS on it.

[@edwardvidal6176]

Has anyone found a way how to convert pico led to pico_w led? Also freeRTOS has an smp branch, Is freeRTOS smp planned for this video series?

[@alexcristian2593]

where is the next part? :(((

[@edwardvidal6176]

I am in process of adding to my rp2040-freertos-project at github the code found in pshell which uses littlefs. I currently have a libcrc16.a that has crc16.c xreceive.c, xtransmit.c, fs.c, lfs.c, lfc_util.c, from pshell project. The library also has head-tail.c and cvtutils.c I have tested pshell and have a document at github pshell-test.pdf. Next I will try and add to libcrc16.a the vi.c from pshell.