Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

lvh831 — Mon, 21 Nov 2022 09:32:46 GMT

Could you elaborate how you did it? I also want to download my code to RAM so that I wouldn't damage the flash unit. It's for CI unit test.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Thu, 12 Sep 2019 07:12:42 GMT

I have tried with some register configuration by referring http://markding.github.io/swd_programing_sram/ and can able to flash code successfully in RAM.

Thanks for your support on this Vidar for understanding what I need.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Wed, 04 Sep 2019 13:27:25 GMT

We are working in a flashing prgram(if I try to explain it , it may go pages & pages) So only I have mentioned what I needed.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Vidar Berg — Wed, 04 Sep 2019 13:26:59 GMT

Please try the blinky example attached below. I just change the address range for the flash segment to code RAM. Segments should be renamed if you want to do it properly.

devzone.nordicsemi.com/.../5557.blinky.zip

You also need to set update PC with the debugger to start execution from RAM:

EDIT: You also need to set the VTOR register if you need interrupt forwarding.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

awneil — Wed, 04 Sep 2019 13:15:30 GMT

[quote userid="81882" url="~/f/nordic-q-a/51757/need-to-flash-code-in-ram-of-nordic-nrf52832-from-segger-embedded-studio/207979"]im trying to get a simple solution[/quote]

But a solution to what problem ?

What problem, exactly, do you solve by having your code disappear when the power is removed?

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Wed, 04 Sep 2019 13:05:34 GMT

Please, I know RAM is volatile & it will be gone once it is power off. Again im trying to get a simple solution . I need to flash code in RAM instead of Flash memory is that possible if so how to achieve this?

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Wed, 04 Sep 2019 13:01:56 GMT

I have tried setting of ProgramSection load="No" in Flash area and making ProgramSection load="yes" in the RAM area in 'Flash_Placement.xml' and removed FLASH related Macro in Section Placement MAcro in Common (Private Configuration), but I got build error in many cases.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

awneil — Wed, 04 Sep 2019 13:00:53 GMT

No, "running from RAM" is not a goal - it is a means to an end.

RAM is volatile - so, when you power-off the board, the code will be gone!

So running from RAM is not going to achieve your stated goal with the LED!

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Wed, 04 Sep 2019 12:56:09 GMT

My goal is very simple. I'm trying to flash blinky SDE example program directly to RAM. Such a way that if I power OFF & ON the board. LED should not blink.(Code will be gone off)

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

awneil — Wed, 04 Sep 2019 12:52:55 GMT

[quote userid="81882" url="~/f/nordic-q-a/51757/need-to-flash-code-in-ram-of-nordic-nrf52832-from-segger-embedded-studio/207963"]I need (sic?) to execute the whole program(all function call) from RAM[/quote]

Why?

If you explain your goal, people may be able to help you get there ...

http://www.catb.org/esr/faqs/smart-questions.html#goal

Again:

you won't be able to get an entire BLE program into RAM;
you will need to consult the Segger documentation (possibly also GCC docs)

[quote userid="81882" url="~/f/nordic-q-a/51757/need-to-flash-code-in-ram-of-nordic-nrf52832-from-segger-embedded-studio/207963"] I have tried different methods[/quote]

What, exactly, have you tried?

What problems, exactly, are you having?

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Wed, 04 Sep 2019 12:49:03 GMT

I have not tried in any other Cortex M4 before, So I don't know whether it is different or Not.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Wed, 04 Sep 2019 12:47:17 GMT

Yes, I need to execute the whole program(all function call) from RAM. I know we need to change in linker script 'Flash_Placement.xml' & Section Placement Macro. I have tried different methods referring website still I have not got a solution.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

awneil — Wed, 04 Sep 2019 12:40:48 GMT

Would it be any different from doing that with any other Cortex M4?

Note that you're not going to fit the SoftDevice into RAM!

😮

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Vidar Berg — Wed, 04 Sep 2019 12:40:03 GMT

Ok, so you want to execute code from RAM. Is it for a particular function call or all function calls in a particular source file? You will need to change the linker script for this.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

Nivas Bathirappan — Wed, 04 Sep 2019 12:36:40 GMT

Yes I need to load code in RAM instead of Flash Memory.

RE: Need to flash code in RAM of Nordic nrf52832 from Segger Embedded Studio?

awneil — Wed, 04 Sep 2019 12:35:49 GMT

Not entirely clear what you mean by that?

You mean load code into RAM?