Re: Get RSSI in DTM(Zephyr)
Tommy Lin (林志聰) <Tommy.Lin@...>
Thanks for your response.
Could you share if there are any reference code for DTM RSSI.
From: Ryan Erickson [mailto:Ryan.Erickson@...]
Sent: Tuesday, February 19, 2019 4:20 AM
To: Tommy Lin (林志聰) <Tommy.Lin@...>; Jamie Mccrae <Jamie.Mccrae@...>; Isaac Chen (陳尚航) <Isaac_Chen@...>; Chettimada, Vinayak Kariappa <vinayak.kariappa.chettimada@...>; zephyr-devel@...
Cc: Hanyu.Hsu@...; Rung-Sheng Lee (李榮盛) <Rung.Sheng.Lee@...>; Brent Tsai (蔡旻其) <Brent.Tsai@...>; Ryan Hsu (徐振鋒) <Ryan.Hsu@...>
Subject: RE: [Zephyr-devel] Get RSSI in DTM(Zephyr)
Per the Bluetooth Spec, there are no DTM commands to obtain RSSI. You would need to add your own custom command in firmware.
Ryan Erickson | Software Development Engineer III
On Behalf Of Tommy Lin (???)
EXTERNAL EMAIL: This email originated outside of Laird. Be careful with attachments and links.
Sorry to bother you.
I use hci command LE Receiver Test Command and LE Test End Command let DUT enter Test mode and can get packets from equipment successfully.
Equipment send 1500 Bytes with RSSI(70 dbm) to DUT
At the same time , I try to launch “btmon” tool to get RSSI information , but I can’t get any RSSI.
Are there any methods can get RSSI in DTM?
From: Jamie Mccrae [mailto:Jamie.Mccrae@...]
Generally you would be measuring the RSSI on the test equipment from a signal generated by your Bluetooth radio, and would be using a calibrated accurate test system. The nRF51824 (from the product spec) has an RSSI accuracy of +/-6dB, that is wildly inaccurate and I cannot see any reason to want to measure/record it on every module. You can add a non-standard command to read and return the RSSI if needed to the DTM code.
On Behalf Of Isaac Chen (???)
Our customer requested us to test conductive BLE RSSI in factory for accuracy improvement.
Could you please clarify the following questions?
1. As I know, BLE RSSI can’t be measured in standard DTM mode. Is it possible to add new feature in DTM to support BLE RSSI measurement?
2. If the answer to the above question is “no”, I still need your confirmation if other test modes exist that can measure RSSI except DTM mode.
In our experiences of other algorithm(LTE/WCDMA…etc.), RSSI usually can be detected easily in test mode via a CW tone. So it’s why we want
to double check this.
3. Do you have any customers who have experiences to measure conductive RSSI in factory or in lab? If so, can you share the methodology?
Quanta Computer Inc.
Business Unit 11 BL1
Tel : +886-3-327-2345 Ext : 17585
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I don’t remember if DTM mode has any RSSI command in the Specification.
Could you please elaborate on your requirements?
On Behalf Of Tommy Lin (???)
We have a product using nRF51824 with zephyr.
We use hci_uart sample code and follow below link , and we can get other BT device’s RSSI.
We have a question , If it is in DTM(Direct Test Mode) , how can we get RSSI?
Could you give us some suggestions.