Central and Peripheral at the same time on the nrf52820

RE: Central and Peripheral at the same time on the nrf52820

Christian22 — Sat, 28 Nov 2020 21:08:03 GMT

Hi Torbjørn,

Thank you very much. This helped me a lot.

Best regards,

Christian

RE: Central and Peripheral at the same time on the nrf52820

ovrebekk — Mon, 23 Nov 2020 10:13:44 GMT

Hi Christian

The SoftDevice RAM consumption doesn't change from one chip to another. It will be the same on both the nRF52833 and the nRF52820.

There is no dedicated DK for the nRF52820 device, so you should be able to use the nRF52833 board that you have for development.

In the SDK there will be some projects that support a board called "pca10100e", which means they are intended to emulate the nRF52820 device while running on an nRF52833DK, and if you use one of these projects you can check the RAM consumption, and how much RAM is left over, if you were using a real nRF52820 device.

Best regards
Torbjørn

RE: Central and Peripheral at the same time on the nrf52820

Christian22 — Sun, 22 Nov 2020 01:35:38 GMT

Hi Torbjørn,

Thanks for the fast response. Unfortunately , my problem is that I only have a nrf52833 board. Therefore I need a solution to be able to estimate the RAM usage of the nrf52820 on the nrf52833. Is this possible?

Based on your sugestion I created a test project in the Keil IDE and used the value from "Total RW size" in the map-File to get an indication of the RAM usage.Does "total RW size" provide a value that can be used to estimate the RAM usage?

By the way I configured the test project for the nrf52833 in order to be able to test it on the device. Does it make any difference in RAM usage if I configure a project for the nrf52820 or for the nrf52833?

Best regards,

Christian

RE: Central and Peripheral at the same time on the nrf52820

ovrebekk — Fri, 13 Nov 2020 12:35:41 GMT

Hi Christian

The minimum RAM requirement for the S140 v7.2.0 is 5.6kB, as mentioned in the release notes:
devzone.nordicsemi.com/.../2627.s140_5F00_nrf52_5F00_7.2.0_5F00_release_2D00_notes.pdf

As you enable more features, such as support for multiple links, larger MTU, larger attribute table etc this number will increase, but based on your description I don't think it will get larger than 10kB.

For an accurate number I suggest you set up a test project and configure the stack as you want. Once you run the example you will get a warning message in the log console stating how much RAM the SoftDevice requires for your particular configuration.

Best regards
Torbjørn