How can design channel map that can coexistence with WiFi to avoid the interference

[Ryan Huang]

Hi,

My development platform is a central device that there is a WiFi function, I want to set BLE channel map to avoid from overlay. Let my central device can coexistence with WiFi. Does anyone tell me how can I decide the channel map?

Does anyone have any way to avoid the interference from WiFi?

Thanks

[David Edwin]

You can use the sd_ble_opt_set function of the S130/S132 to set the channel map so that the WiFi is avoided. The opt_id you would use is the BLE_GAP_OPT_CH_MAP .

The channels used by WiFi should be set as a "bad" channel, get the WiFi channels in use from your WiFi interface.

[Ryan Huang]

Hi David, Thanks for your reply!

1. Does the "gap_opt.ch_map.ch_map" set "1" or "0" If this channel is bad that I don't used?

2. Could you please tell me why we need to set the BLE channel map? Frequency hopping is built into the bluetooth protocol, so the bluetooth connection will adapt to congested channels due to WiFi. This should be handled automatically by the softdevice. Is Right?

[David Edwin]

Yes, it will hop through the WiFi channels, however if you do not compensate for the WiFi your performance will suffer. The map bit setting is as per the specification reference, bad = 0, unknown = 1

[Ryan Huang]

Hi David, Thanks for your reply!