SCAN 1MPHY&codedPHY ADVICE

RE: SCAN 1MPHY&codedPHY ADVICE

Simonr — Mon, 24 Feb 2020 06:49:06 GMT

What phone are you connected to while scanning? It seems to me like this is caused by the phone not supporting extended advertising, as very few phones support that as of yet. I'm guessing the central_and_peripheral device you have disables the extended flag when connected to a device that doesn't support it.

Best regards,

Simon

RE: SCAN 1MPHY&codedPHY ADVICE

jermi — Fri, 21 Feb 2020 01:39:19 GMT

think your reply ！！

sorry，I may not express clearly。

Customer application scenarios:

ble_peripheral 1 NRF52840 codedPHY advitise interval 1s

ble_peripheral 2 NRF52840 1MPHY advitise interval 1s

ble_central_and_peripheral NRF52840

1)central scanparam：（only scan get rssi not connect.）

2)peripheral connect interval : 50ms

Test situation:

1) The scanning result of the ble_central_and_peripheral when the broadcast is turned on or the mobile phone is linked is as follows:

From the results of the scan, each scan to COEDPHY takes more than 30 seconds, and the customer hopes to shorten the interval between scans to codedphy

2）The scanning results of the ble_central_and_peripheral without turning on the advitise and not linking the mobile phone, The scanning parameters and scanning results are as follows：

The scan results are normal，each scan to COEDPHY takes less than 4 seconds.

issues that need resolving

Now I am puzzled that after the mobile phone is connected, the scan interval of coded scan results reaches 30 seconds. How can I shorten this interval?

thinks！！

RE: SCAN 1MPHY&codedPHY ADVICE

Simonr — Wed, 19 Feb 2020 09:30:49 GMT

This seems to be the case of what I briefly explained in my last reply. It seems like you're only scanning on the primary BLE channels (37, 38, and 39). Seeing as Coded PHY uses extended advertising, which advertises most of the advertisement on the secondary channels, that would explain why you're not seeing it very often.

Please make sure that you have set the parameter .extended = 1 in ble_gap_scan_params_t in your scanning application.

Best regards,

Simon

RE: SCAN 1MPHY&codedPHY ADVICE

jermi — Wed, 19 Feb 2020 04:25:39 GMT

sorry，I Forget to tell you， This host has a link as a slave with the phone while scanning。

RE: SCAN 1MPHY&codedPHY ADVICE

jermi — Wed, 19 Feb 2020 01:25:51 GMT

Hi Simonr:

CODED and 1MPHY advertisements are broadcast once every 1 second. The scan results are shown in the figure below. Why is CODEPHY scanned much less than 1MPHY? Codedphy takes almost 30 seconds to be scanned once.

scan parameter configuration: Scan interval 1.7 second ， Scan window 5.1second

thinks！！！

RE: SCAN 1MPHY&codedPHY ADVICE

Simonr — Mon, 17 Feb 2020 11:29:35 GMT

Can you explain what you mean with "Only a small part coded can be scanned"? Does that mean that just some of the devices are appearing, or that just a small part of the advertisement appears? In the latter case, that means that you're only scanning on the primary channels, and are not seeing the Coded PHY advertisements on the secondary channels.

Best regards,

Simon

RE: SCAN 1MPHY&codedPHY ADVICE

jermi — Mon, 17 Feb 2020 02:12:42 GMT

Hi Simonr:

I have set the extended flag to 1，Scan interval 2.156s (3450 * 0.625ms)
Scan window 1.067s (1707 * 0.625ms) , when I scan Coded &1MBPS PHY,

Almost all 1Mbps advertise can be scanned, but Only a small part coded can be scanned, (I have 10 CEDEDPHY and 10 1MPHY advertise, advertise interval 1 minute， window 5 seconds）。

thinks！！

RE: SCAN 1MPHY&codedPHY ADVICE

Simonr — Fri, 14 Feb 2020 08:02:39 GMT

1. You won't be able to scan Coded and 1MBPS PHY at the same exact time, as there is only one radio on our nRF52 series chips, so you'll have to switch between the two PHYs when scanning.

2. When scanning on multiple PHYs, the modes will switch between one another based on the interval. Have you set the extended flag to 1? This will be necessary to discover Coded PHY advertisements.

Best regards,

Simon