Suggest a free RTOS for 8051 based application

[smith_suez]

can any one suggest a free RTOS for 8051 based application. This is for educational purpose.
Thanks in advance

 

[microlab]

Re: RTOS for 8051

hai
try rtx51
which is available with keil
u can downlaod this from their website
which will give u an eveluation version
and can be use it for learning purpose

ml

 

[fireplus]

Re: RTOS for 8051

uc/os II is a good one

Fire in The Wire :idea:

 

[TechToys]

Re: RTOS for 8051

Try www.freertos.org

There is a port for Cygnal 8051.

Good articles there too.

For uCOSII, there is a complete book written by Jean J Labrosse.

John

 

[lambtron]

Re: RTOS for 8051

Here's an extremely simple, lightning fast, multitasking kernel that will run up to four threads. This can be used as a foundation for a real-time os.

; EXEC is the kernel entry for tasks.  The kernel assumes exclusive use
; of registers R6 and R7 in each task register bank.  Up to 4 tasks are
; supported by the kernel, as the 8051 has 4 register banks.
;       Entry:	R6 contains task blocking-time request.
exec:
        mov	r7,sp                   ;save task stack state
        mov	a,psw                   ;fetch current tsk reg bank ptr
bump_bank:
        add	a,#8                    ;  & bump it to next task's bank
        anl	a,#18h
        mov	psw,a
        jnz	bump_task_timer         ;branch fwd if not last tsk in list
        jnb	new_tick,$              ;wait for next realtime tick
        clr	new_tick                ;  then reset realtime tick flag
bump_task_timer:
        djnz	r6,bump_bank
        mov	sp,r7                   ;restore task stack state
        ret                             ;  & exit to task

 

[smith_suez]

Re: RTOS for 8051

Thanks everyone....
Does free rtx51 support priority based scheduling?

 

[rosarioantony]

Re: RTOS for 8051

this is a free open source RTOS portal . they have ported for cygnal 8051 controller.
https://www.freertos.org/