softdevice S140 v6.0.0: how to set the channel mask for different channels

[Youssif]

Hi

Can you please provide an example/pseudo-code on how the channel_mask member in the ble_gap_adv_params_t struct is used? The only examples provided in the SDK and the migration document set the entire member to {0} and it is unclear how this should used. In other words, what should we set the channel_mask to if we want to use channels 37, 38, and 39. We have tried the pseudocode below but starting advertising failed:-

s_adv_params.channel_mask[0] = 0xFF;
s_adv_params.channel_mask[1] = 0xFF;
s_adv_params.channel_mask[2] = 0xFF;
s_adv_params.channel_mask[3] = 0xFF;
s_adv_params.channel_mask[4] = 0x1F;

We are using softdevice S140 v6.0.0 and SDK 15.0.0 on an nRF52840 PDK.

Thanks

Youssif

[Sigurd]

Hi,

It is currently not supported to mask away secondary advertising channels, if you try that you will get a "NRF_ERROR_NOT_SUPPORTED" returned from sd_ble_gap_adv_set_configure(). This is what's happening in your case. If you set a bit in the channel_mask to 1, the channel is not used (masked away).

So if you want to use 37, 38, and 39 (primary advertising channels), then you don't need to set a channel mask at all. The adv_params are usually memset to 0 after declaration anyways. But you can of course set all your s_adv_params.channel_mask[x] to 0x00.

[Youssif]

Thanks a lot for your quick response.

[Youssif]

OK one more question, what if I want to advertise on channel 37 but not 38 and 39, how would I set that?

Thanks

Youssif

[Sigurd]

Hi,

You could set it like this: adv_params.channel_mask[4] = 0xC0;

[Lexi]

Hi, what is the [4] means here? if I just want to advertise on 38 then how it will be look like? and can I set it like "p_advertising->adv_params.channel_mask[4] = 0xC0" in ble_advertising.c ?