Open source OS

[Altera_Forum]

Hi, 

I am a beginner to embedded OS. can you introduce open source RTOS OS to work on Nios II ? I search for a free RTOS OS that its performance is similar to commercial OS such as ecos. Best Regards.

[Altera_Forum]

Given that you are a beginner, it would be useful to read about an RTOS and be able to use the code. I would recommend downloading the Micrium books about uCOS-III.  

 http://micrium.com/  You may need to register to download the PDFs, but its definitely worth it.  The NIOS II examples already have uCOS-II examples.  If you want to understand how to port the OS, then read through this document (its for an ARM microcontroller);  https://www.ovro.caltech.edu/~dwh/ucos/project_ar1803.pdf https://www.ovro.caltech.edu/~dwh/ucos/gcc_and_ucosii.zip  uCOS-II and uCOS-III are not open-source, but their source code is available to read. You can use the OS for university and non-commercial purposes.  Once you understand uCOS-II/III you can take a look at other OSes, eg., FreeRTOS.  http://www.freertos.org/  Cheers, Dave

[Altera_Forum]

Dear Dave, 

many thanks. I read some documents about RTOS previously. what is your opinion about read ecos documents to start RTOS learning? I am an student and i am working on my final university project. How can i get license of uC/OS-III or uC/OS-II ? Best Regards.

[Altera_Forum]

--- Quote Start ---   I read some documents about RTOS previously. what is your opinion about read ecos documents to start RTOS learning?   --- Quote End ---   I never found eCOS documentation particularly good. I have this book  http://www.amazon.com/embedded-software-development-anthony-massa/dp/0130354732  which you can download in PDF from  http://ecos.sourceware.org/docs.html  I read it, but was never inspired to use eCOS ... whereas I have had uCOS-II running in one system continuously since 2000.    --- Quote Start ---   I am an student and i am working on my final university project. How can i get license of uC/OS-III or uC/OS-II ?   --- Quote End ---   You don't need it. You already have the source to uCOS-II in your Quartus/NIOS installation. You can download the source to uCOS-III from the Micrium site, along with PDF copies of all the books they sell.  Cheers, Dave