I am trying to demonstrate the FMCOMMS FM Radio demo described here: HowTo: observe the FM band with an AD9361-equipped board [Analog Devices Wiki]
I am using the FMCOMMS4/Zedboard setup with an FM radio antenna connected to the broadband Rx port.
I can observe the FM radio spectrum on the IIOScope and have many strong signals.
When I execute iio_fm_radio_play in the console, I hear very clear audio on the HDMI monitor but it is very choppy and not continuous.
I have attached a screenshot of the console showing the output from iio_fm_radio_play. It shows continuous underrun!!! errors (?) that might be the reason for the choppy audio. Can you explain this?
Additionally, is there any documentation for iio_fm_radio_play? Perhaps there are some switches that I am not aware of?
Separately, I get permission errors if I try to pipe the audio data to the headphone jack using the "iio_fm_radio 95.5 | aplay -D default:CARD=ADAU1761 -r 48000 -f S16" command.
I would like to demonstrate clear, continuous audio on either the HDMI monitor speakers or the headphone jack. Please let me know if this is possible and how to properly demonstrate.