nRF52832 RAM not initial when reset.

RE: nRF52832 RAM not initial when reset.

Somesh Burkule — Thu, 13 Aug 2020 09:17:10 GMT

Hi,

I want to reset RAM but I cant use pin reset because I can't change of custom board now.

I am doing softreset for that but as checked product specification softreset can't reset RAM. Is there any other to reset RAM using software?

RE: nRF52832 RAM not initial when reset.

zxcv7063 — Mon, 20 Apr 2020 08:56:37 GMT

Hi:

ok, Let me see first !

RE: nRF52832 RAM not initial when reset.

Håkon Alseth — Mon, 20 Apr 2020 06:53:40 GMT

Hi,

pin reset will clear the RAM:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=4_2_0_17_7#unique_832471788

Kind regards,

Håkon

RE: nRF52832 RAM not initial when reset.

zxcv7063 — Mon, 20 Apr 2020 02:32:16 GMT

Hi:

I've tried it the recommended way . The following problems are found.

The following screenshots:

When artificially pull down reset pin , Can ram be saved ?

RE: nRF52832 RAM not initial when reset.

Håkon Alseth — Wed, 08 Apr 2020 10:59:57 GMT

Hi,

Please see this post, it includes projects for most compilers we support:

https://devzone.nordicsemi.com/f/nordic-q-a/36848/nrf52840-ram-retention-example-fails-with-max_test_iterations-1

Kind regards,

Håkon

RE: nRF52832 RAM not initial when reset.

zxcv7063 — Wed, 08 Apr 2020 09:44:36 GMT

Hi:

I use S132 softdevice , I don't quite catch your meaning.

Can you say specifically it ?

RE: nRF52832 RAM not initial when reset.

Dmitry — Wed, 08 Apr 2020 09:38:13 GMT

Hi,

I would not rely on specific compiler features. Instead, you can change RAM parameters in project settings (for example, 0x20000010 0xfff0, if you don't use SoftDevice), and create a direct pointer to variable that is outside of project memory:

int *myvar = (int *) 0x20000004;

RE: nRF52832 RAM not initial when reset.

zxcv7063 — Tue, 07 Apr 2020 15:52:24 GMT

Hi ALL:

I use keil, How should i configure it ?

RE: nRF52832 RAM not initial when reset.

hmolesworth — Tue, 07 Apr 2020 15:46:27 GMT

Try looking towards the end of this timestamp link; I posted some simple code to allow variables to be not initialized on a reset in IAR and SES which might help