ram resource requirements

RE: ram resource requirements

user91830 — Wed, 08 Jun 2022 13:05:14 GMT

ok，i will try to test ,

Thanks.

RE: ram resource requirements

Hung Bui — Wed, 08 Jun 2022 12:48:02 GMT

Hi Delay 7,

It's pretty much depends on the service and the characteristic.
The easiest way to estimate that is to actually test using our project. You will have a rough idea of how many bytes needed for a certain service/characteristic.

RE: ram resource requirements

user91830 — Wed, 08 Jun 2022 11:49:33 GMT

thanks your reply.it`s useful.but i want to estimate the ram before developing project.when adding a device infomation services 、battery services or custom services as a central.Is there any relevant experience parameters, such as how much ram will be required by adding a nus.

Thanks again

RE: ram resource requirements

Hung Bui — Wed, 08 Jun 2022 11:05:39 GMT

Hi delay_7,

You can find out the RAM required for the softdevice by looking at the p_app_ram_base that's output from the sd_ble_enable() function.
You can see this in the description of sd_ble_enable() function:

* @param[in, out] p_app_ram_base Pointer to a variable containing the start address of the application RAM region (APP_RAM_BASE). On return, this will contain the minimum start address of the application RAM region required by the SoftDevice for this configuration.

What you can do is to printout p_app_ram_start after sd_ble_enable() call in nrf_sdh_ble_enable() in nrf_sdh_ble.c. Similar to what we do here when the ram on configured for the softdevice is not sufficient: