ESB and nrf_esb_read_rx_payload() is returning a positive rssi value

[Mahendra Tailor]

Hi

This is a heads up that in SDK15.2.0  and file nrf_esb.c you have the line

m_rx_fifo.p_payload[m_rx_fifo.entry_point]->rssi = NRF_RADIO->RSSISAMPLE;

it should actually be

m_rx_fifo.p_payload[m_rx_fifo.entry_point]->rssi = NRF_RADIO->   - RSSISAMPLE;

Regards

Mahendra

[Sigurd]

Hi Mahendra,

Thanks for the heads up. It’s correct that the value from NRF_RADIO->RSSISAMPLE is read as a positive value while the actual received signal strength is a negative value. It would therefore make sense that the ESB code converts the value from positive to negative, or document it clearly that the actual RSSI is negative. I will report this to the developers.

[Mahendra Tailor]

Thank you. Just  reread my post and the correction to the code should be

m_rx_fifo.p_payload[m_rx_fifo.entry_point]->rssi =  - NRF_RADIO->RSSISAMPLE;

Apologies