FAQ Can I check CSI data is outputted?

Read bitfields phyX_pkt_cnt, where X can be 0,1,2, or 3. These registers will appear to output random values while CSI data is being output. Note: Due to the random output, there will be a 1 in 256 chance that the output will be zero during normal operation. it is recommended to read this bitfield multiple times to reduce the likelihood of a false negative.