Conversion of RSSI to dBm

RE: Conversion of RSSI to dBm

TML_YT — Thu, 28 Apr 2022 11:13:06 GMT

Thank you for your answer.
I understand it very well.

RE: Conversion of RSSI to dBm

ketiljo — Thu, 28 Apr 2022 06:54:30 GMT

Yes, this is correct. From the register description:

RSSI sample result. The value of this register is read as a positive value while the actual received signal strength is a negative value. Actual received signal strength is therefore as follows: received signal strength = -A dBm

RE: Conversion of RSSI to dBm

TML_YT — Thu, 28 Apr 2022 00:24:00 GMT

Thank you for your reply.

The value of rssi that can be read in SEGGER debug mode is positive, and the further away and the weaker the signal, the larger the number, 40, 60, 80... (in decimal).

On the other hand, the rssi in the payload nrf_esb_payload_t is int8_t (i.e. signed char), but does it not have a minus '-'?

Is it correct to understand that the readable rssi value with a '-' is the dBm value of the rssi?

RE: Conversion of RSSI to dBm

ketiljo — Wed, 27 Apr 2022 11:52:34 GMT

Figure 124 refers to 15.4 modulated packets and ESB is not using that. The value you read from the RSSISAMPLE register is the RSSI value in dBm. No need for any conversion here