Simple FreeRTOS example with softdevice doesn't work

[himanshu pande]

I have created a simple program with 4 FreeRTOS threads(One time, 10 ms, 100 ms, 1000 ms) and it works fine stand alone giving me periodic tasks as expected.

Linker portion for working example:

MEMORY { FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x80000 RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x10000 }

But this same example doesn't work at all when I use S132 softdevice.

Firstly, if I flash my hex file as it is after softdevice is flashed, I get error of being not able to write to the memory. So in my application, I try a small change with linker

MEMORY { FLASH (rx) : ORIGIN = 0x1f000, LENGTH = 0x61000 RAM (rwx) : ORIGIN = 0x20002128, LENGTH = 0xded8 } which allows me to flash my application when softdevice is also existing on the chip.

I have tried the following solutions already but they don't work for me:

devzone.nordicsemi.com/.../

devzone.nordicsemi.com/.../

What exactly is the problem of using FreeRTOS and softdevice together?

[Susheel Nuguru]

They work together. Are you making sure that if you are enabling any interrupts in your application, then they cannot have priority 0? Also which version of softdevice are you using? Can you be more descriptive about not working with softdevice part. What is not working? application main not starting or some failures ?

[himanshu pande]

Softdevice used is : s132_nrf52_3.0.0_softdevice. And like I told, the application simple has 4 FreeRTOS threads with no other interrupts or functionality. I am not using any functionality of the softdevice as of now. But I intend to in the future. I am still unclear over why the example works stand alone but not with softdevice. I get the hard fault handler inside vTaskStartScheduler call.

Also, if I dont consider the softdevice at all, the example works when flash origin is 0x0 in linker but doesn't work when flash origin is 0x1f000.

[Susheel Nuguru]

seems like you are using GCC. So probably this is related to you devzone.nordicsemi.com/.../

[himanshu pande]

Do we have a solution for this problem? Also, I would like to point out that regardless of softdevice, I face a fault when the code is placed at 0x1f000.

FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x80000 -> Code works fine FLASH (rx) : ORIGIN = 0x1f000, LENGTH = 0x61000 -> Doesn't work

[Susheel Nuguru]

I would like to point out that regardless of softdevice, I face a fault when the code is placed at 0x1f000.

If you are placing your code at 0x1f000, then the softdevice is located from 0x0 till 0x1effff. So it cannot be regardless of softdevice. Are you enabling softdevice when you place your code at 0x1f000? can you share your code that reproduces this issue.