I want to develop C# program to get product rssi value on specific channel by using nRF52840 dongle pca10059

[Benny_Lin]

I 'm developing a program (C# ) on PC for the nRF52840 dongle (pca10059) that is a RSSI scanner.

Scanning different BLE channels in the environment. The program is much like the nRF connects "RSSI viewer".

Finally,the goal of program is to scan for RSSI values while not connecting to any device, just scan a specific channel.

Here, What approach should I manually get rssi value from nRF52840 dongle (pca10059)?

Thanks!

 

Benny_Lin

[Jørgen Holmefjord]

Hi,

We do not have any application examples implemented in C#, but the source code for the nRF Connect RSSI application (written in Node.js) is available on GitHub.

The firmware running on the boards are also available in source code, and can be built for the nRF52840 Dongle. The RSSI application communicates with the dongle over USB CDC ACM, so it should be possible to integrate the required functionality in your C# application.

Best regards,
Jørgen

[Jørgen Holmefjord]

Benny_Lin said:

The main.c is the RSSI viewer source code?

No, main.c is the source code of the firmware running on the Dongle. The RSSI viewer application source code is found in https://github.com/NordicSemiconductor/pc-nrfconnect-rssi/tree/master/src.

Benny_Lin said:

I study and follow main.c . I manually use putty tool connect to Dongle via usb and send "start" 

the response is 

I'm not sure what format you are reading in Putty, but is I'm not sure it is converted correctly in the txt file.

The packets from the RSSI firmware is 3 uint8_t bytes, starting with 0xFF, then the channel number, and finally the RSSI value:

[Jørgen Holmefjord]

The measured data is the RSSI value, as described in Received signal strength indicator (RSSI). Note that the RSSI value in the data packets from the firmware value is positive (uint8_t), while the actual RSSI value is negative, so you need to multiply by (-1), see RSSISAMPLE register documentation.

[Benny_Lin]

Hi Jorgen

Do RSSI Viewer application directly use measured data from  packets from the RSSI firmware is 3 uint8_t bytes to draw chart realtime?

Thanks!

[Jørgen Holmefjord]

It will filter the packets according to the Channels and Levels filters in the application, and hold the highest RSSI value from x number of last scans for each channel according to the hold time configuration, but apart from this, the application uses the RSSI samples as-is as far as I can see.

[Benny_Lin]

Hi Jorgen 

I will do experiment in real environment (receive adv channel rssi) by using Realterm and RSSI Viewer.

In Realterm Tool ,by sending "scan adv true" before sending "start" command, Does Any else command should I send?

Could you help to provide command list? 

Thanks

[Jørgen Holmefjord]

Benny_Lin said:

In Realterm Tool ,by sending "scan adv true" before sending "start" command, Does Any else command should I send?

That should be sufficient, but you can configure delay and how many times each channel should be sampled each interval.

Benny_Lin said:

Could you help to provide command list? 

The commands are not documented, as this is not intended as a standalone firmware for use outside of the application. But you can read the command list from the code.