--ramwr values persist after reboot (using nrfjprog to set values)

RE: --ramwr values persist after reboot (using nrfjprog to set values)

rshankle — Fri, 07 Jun 2019 11:38:17 GMT

thanks for the links. BTW I was able to make some progress if I changed the addresses I was using. I thought I grabbed the 0x2000.... from one of the examples. I'm seeing some success with 0x1000 1024 as a memory location. (I expect 0x1000 1000 to 0x2000 0000 to work.)

thanks again,
Bob

RE: --ramwr values persist after reboot (using nrfjprog to set values)

Håkon Alseth — Fri, 07 Jun 2019 08:57:56 GMT

Hi Bob,

There are three examples showing how to write to the flash in the SDK:

examples/peripheral/flash_fds

examples/peripheral/flash_fstorage

examples/peripheral/flashwrite

The last one shouldn't be used if you use the SoftDevice.

You can also find more info in the documentation regarding fds and fstorage:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_fds.html?cp=5_1_3_55

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_fstorage.html?cp=5_1_3_56

If your application stores bluetooth bonding data, chances are high that you already have fds in your project.

Kind regards,

Håkon

RE: --ramwr values persist after reboot (using nrfjprog to set values)

rshankle — Thu, 06 Jun 2019 13:10:44 GMT

Hakon,

Can you send an example on saving to flash that will persist after a full power cycle? Maybe I'm doing something wrong on my end.

thanks
Bob

RE: --ramwr values persist after reboot (using nrfjprog to set values)

Håkon Alseth — Thu, 06 Jun 2019 13:07:17 GMT

I do not see any other solutions than storing these settings to the flash.

You can look at "fds" module (which uses fstorage) for flash storage.

Kind regards,

Håkon

RE: --ramwr values persist after reboot (using nrfjprog to set values)

rshankle — Thu, 06 Jun 2019 12:41:06 GMT

Hakon,

I need to program the configuration parameters into the nRF52832 and then power down the board for shipping to the customer's site.

I've tried "nrfjprog --reset" that of course works because power isn't lost to the board. But "nrfjprog --pinreset" doesn't work (meaning the data isn't maintained in memory when the processor comes back up.)

Are there registers/memory locations in the nRF52832 that I can use as NVRam?

thanks,
Bob

RE: --ramwr values persist after reboot (using nrfjprog to set values)

Håkon Alseth — Thu, 06 Jun 2019 12:35:24 GMT

Hi,

Could you try "nrfjprog --reset"?

Kind regards,

Håkon

RE: --ramwr values persist after reboot (using nrfjprog to set values)

rshankle — Thu, 06 Jun 2019 11:43:13 GMT

Hi,

Using nrfjprog how do I write to NonVolatile RAM so the data persists after I power the board off and back on?

(A different way to look at it, how do I get data to persist after doing "nrfjprog --pinreset" ?

thanks,
Bob

RE: --ramwr values persist after reboot (using nrfjprog to set values)

Håkon Alseth — Thu, 06 Jun 2019 08:30:24 GMT

Hi,

There are three types of reset which does not reset the RAM, as shown in this table:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=3_1_0_17_7#unique_832471788

A soft-reset is one of the sources that doesn't reset the RAM, and therefore the stored data still persists. A power cycle will include a power-on-reset, thus you cannot trust your RAM content at that point.

Kind regards,

Håkon