freeRTOS port to RH850

pra18 · May 31, 2022, 5:43am

Hi

1.Do we have working port of freeRTOS to RH850 ?

2.Do we have any document that describes porting steps such as creating startup code, configuring tick timer interrupts, stack and so on… ?

Many Thanks,

Pr

ravibhagavandas · May 31, 2022, 11:34pm

Hi,

We dont have an officially supported for Renesas RH850, however you can find contributions to this port in forum post here:

pra18 · June 1, 2022, 3:42pm

Hi

Thank you for the pointers , can you share path to a downloadable version of this v10.4 that contains port for Renesas RH850 ? We could find it elsewhere

also, if we take latest n greatest version of the freertos , is this port of renesas rh850 still exist as a standard part of the supported micros?
Especially this is of relevance when we get success with v10.4 and want to migrate to latest freertos

Thanks,
Pra

rtel · June 1, 2022, 3:56pm

Not sure if this is the same pointer Ravi provided one post above the last, just in a different thread: FreeRTOS Ported to RH850

There isn’t an RH850 in the “officially supported ports” as defined here - Officially supported and contributed FreeRTOS code - some definitions - but if there is a need and interest we could look at including one under one of the third party contributed categories - defined on the same page.

pra18 · June 13, 2022, 9:39am

hi

Thanks for the reply

For now we need proving freertos kernel on our Renesas RH850 target and do what it takes to get a stable port. We are also unsure as to whether we should build on a freertos version that had earlier ben proven on RH850 ( that is V10.4) or take a route with picking up latest kernel versions.

Regards,
Pra

pra18 · December 29, 2022, 2:47pm

Hi,

Is the freeRTOS port to RH850 compliant to be native POSIX ? Or if we want to make it POSIX styled do we need to re work on this port?

Thanks

rtel · December 29, 2022, 5:26pm

FreeRTOS does not natively use the POSIX threading API, but there is a wrapper that implements a subset of POSIX threading calls on top of FreeRTOS. The wrapper is not complete or regularly tested though.

keyur_khatri · February 10, 2025, 6:14am

Hi ,

I am using rh850 micrcontroller and I have ported this FreeRTOS

I have created a 3 UART Tasks which send data on UART.

In that I have used a vTaskDelay() function, code gets stuck in that function and never comes out of that

Can you please provide help in these ?

karahulx · February 10, 2025, 7:01am

Hi @keyur_khatri
Can you provide your complete code ? Is it possible to attach a debugger and see where the code is stuck inside vTaskDelay() ? Do you have configASSERT defined? Also ensure that the system tick timer is configured correctly and the tick interrupt is firing.

keyur_khatri · February 10, 2025, 7:08am

Thank for response.

Please check below attach image for reference where the code gets stuck

I have attached the RTOS code on which i am working.
Please check that code and help me if possible

RH850_RTOS.zip (3.2 MB)

aggarg · February 10, 2025, 7:27am

You likely need to update your boot.asm file and install vPortYield as TRAP0 handler. Try to update the vector table in the boot.asm file to the following:

;-----------------------------------------------------------------------------
;	exception vector table
;-----------------------------------------------------------------------------
	.section "RESET", text
	.align	512
	jr32	__start ; RESET

	.align	16
	syncp
	jr32	_Dummy ; SYSERR

	.align	16
	jr32	_Dummy

	.align	16
	jr32	_Dummy ; FETRAP

	.align	16
	jr32	vPortYield ; TRAP0 - Install vPortYield as TRAP0 handler.

	.align	16
	jr32	_Dummy_EI ; TRAP1

	.align	16
	jr32	_Dummy ; RIE

	.align	16
	syncp
	jr32	_Dummy_EI ; FPE/FXE

	.align	16
	jr32	_Dummy ; UCPOP

	.align	16
	jr32	_Dummy ; MIP/MDP

	.align	16
	jr32	_Dummy ; PIE

	.align	16
	jr32	_Dummy

	.align	16
	jr32	_Dummy ; MAE

	.align	16
	jr32	_Dummy

	.align	16
	syncp
	jr32	_Dummy ; FENMI

	.align	16
	syncp
	jr32	_Dummy ; FEINT

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority0)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority1)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority2)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority3)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority4)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority5)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority6)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority7)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority8)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority9)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority10)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority11)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority12)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority13)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority14)

	.align	16
	syncp
	jr32	_Dummy_EI ; INTn(priority15)

	.section "EIINTTBL", const
	.align	512
	.dw	#_Dummy_EI ; INT0
	.dw	#_Dummy_EI ; INT1
	.dw	#_Dummy_EI ; INT2
	.rept	2048 - 3
	.dw	#_Dummy_EI ; INTn
	.endm

	.section ".text", text
	.align	2
_Dummy:
	br	_Dummy

_Dummy_EI:
	br	_Dummy_EI

keyur_khatri · February 10, 2025, 9:42am

Thanks for response I am able to see the the improvement here now it is not gets stuck in vTaskDelay function.

But when it goes to execute UART task 3 then it got stuck in vPortFree function.
Kindly check the attached image for reference

aggarg · February 10, 2025, 10:31am

You are using heap_1 which does not allow freeing memory. Switch to heap_4 instead.

keyur_khatri · February 10, 2025, 11:46am

Thanks for the response. Now it is working correctly and task is executing properly

Appreciate your genuine Response @aggarg

Thankyou