I was looking for low footprint RTOS (with minimal capability of Message Q, semaphore, memory mgmt, few tasks & interrupts) and found silRTOS fits for my budget size(
- posted
16 years ago
silrtos port on ARM
Loading thread data ...
- Vote on answer
- posted
16 years ago
Hi i guess the first thing that you have to do is implement a interrup timer. Which will be utilized for sechduling and other timing pupose.
Have you compiled silRTOS for the ARM9? Is it a C code? Do u have boot loader ready?
- Vote on answer
- posted
16 years ago
I'd never heard of silRTOS so am interested to see what it is like. I found it through Google but download link is broken.
Did you consider FreeRTOS.org?
-- Regards, Richard. + http://www.FreeRTOS.org & http://www.FreeRTOS.org/shop 14 official architecture ports, 5000 downloads per month. + http://www.SafeRTOS.com Certified by TÜV as meeting the requirements for safety related systems.
- Vote on answer
- posted
16 years ago
Speaking of FreeRTOS
Atmel AT91SAM7S256.... using the AT91SAM7S64 stuff
in the context load for ARM, is it not 'incorrect' to load R0-R14 in the context switch since your using SUB PC [LR -#4]
The stacks for the tasks all have pattern data in R0-R14 prior to first run. I changed it to [LR-#13] to leave the link register alone [R14] and the return worked correctly. Am I missing something?
-- Posted via a free Usenet account from http://www.teranews.com
- Vote on answer
- posted
16 years ago
No.
The pattern data in R0 to R14 are placed in the User mode stack by code running in Supervisor mode. Two different LR registers are being used.
Yes - probably you are not calling main() from Supervisor mode (or at least switching to Supervisor mode prior to starting the scheduler). This is a very common mistake, hence the comments warning you of this in the code, and the notes in red text on the documentation pages, and the FAQ :o)
-- Regards, Richard. + http://www.FreeRTOS.org & http://www.FreeRTOS.org/shop 16 official architecture ports, 5000 downloads per month. + http://www.SafeRTOS.com Certified by TÜV as meeting the requirements for safety related systems.
- Vote on answer
- posted
16 years ago
ound