Error value of RSSI in mesh

[P Sumanth]

Hi,

I am using nRFmesh SDK for a project. I have configured all nodes(devices) into one group. Each device will publish message for every three seconds. I am reading the RSSI value for message received from other individual nodes from NRF_RADIO->RSSISAMPLE. Suddenly Some times I see RSSI value as 0 even device is 5 to 6 feet far. I would like to know why the value is zero sometimes.

Regards

Sumanth

[Joakim Jakobsen]

Hi.

I am reading the RSSI value for message received from other individual nodes from NRF_RADIO->RSSISAMPLE.

So you are reading the RSSI from other nodes. Not the nodes you mention in your first sentence ("I have configured all nodes into one group")?

Could you add some more information about how you are retrieving the RSSI?

Best regards, 
Joakim 

[P Sumanth]

Hey

I am reading the RSSI from the nodes I configured. I am reading as below mentioned.

Each node sends its application data to other nodes. I will sort out the application data when I receive message, then I identify the node and read the RSSI from NRF_RADIO->RSSISAMPLE. I just store in a variable as

rssi_var = - ((int32_t) NRF_RADIO->RSSISAMPLE);

Some times I am seeing the rssi_var value as zero suddenly. I would like to know why its happening like that.

Regards

Sumanth

[Joakim Jakobsen]

Thanks. 

Do you start the RSSI measurement by issuing TASKS_RSSISTART first?
Ref: https://devzone.nordicsemi.com/f/nordic-q-a/53054/can-i-get-rssi-with-cw-signal-by-sg-for-factory-test/

[P Sumanth]

No, I have directly used NRF_RADIO->RSSISAMPLE

[Joakim Jakobsen]

Are you sure that you have received a message when you read the RSSISAMPLE register?

Could you try reading the register as suggested in the ticket in my previous answer?

Cheers,
Joakim

[P Sumanth]

I am sure, after receiving message only I read RSSISAMPLE. The rssi value are proper most of the times, only sometimes its value is read as zero, rest it worked.

I followed the above ticket , the rssi values are completely different from what I get now. Too much difference between both values.