Setting up RAM with nRF52, S132, and SDK 11

[Bret Foreman]

I'm getting the following log messages when I try to initialize the BLE stack:

First from CHECK_RAM_START_ADDR, I get:

RAM START ADDR 0x20002080 should be adjusted to 0x20001FE8

RAM SIZE should be adjusted to 0xE018

Then, from softdevice_enable I get:

sd_ble_enable: RAM START at 0x20002080

sd_ble_enable: app_ram_base should be adjusted to 0x20001FE8

ram size should be adjusted to 0xE018

I searched through this forum and also the Infocenter and I can't find specific instructions for how to "adjust" these things. I think they are settings in the Keil project configuration but I can't find detailed instructions for what actions to take.

[Bret Foreman]

I did find this: infocenter.nordicsemi.com/.../nRF52_Series_Migration_v1.0.pdf

Which discusses the RAM settings in the migration case. But I thought I was starting with an nRF52 template.

[Bret Foreman]

I found the answer in the project's "Target" options. But really, the error message should contain more specifics about where to go to fix the problem.

[Øyvind Karlsen]

You can find some common IRAM and IROM values at the bottom of this blogpost.

[Vidar Berg]

s13x v.2.x.x supports dynamic memory allocation so you can optimize the softdevice's RAM usage for a specific use case. You can find more details about this feature in the migration document included with the softdevice in addition to what is mentioned in the SDS.

The examples allocate more RAM than what is actually needed, hence the log messages. This allows you do add characteristics, etc to the example without getting a "no memory" assert right away.

s13x_nrf5x_2.0.1_migration-document.pdf