nrf5340_audio" in "v2.8.0" supports "GAIN control" in "SPI+GPIO mode".

[KF_Kozaki]

Please confirm whether the "sample app nrf5340_audio" in "v2.8.0" supports "GAIN control" in "SPI+GPIO mode".
the method to enable "GAIN control" in "SPI+GPIO mode" if the sample app "nrf5340_audio" in v2.8.0 supports it.


https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/fem/fem_nrf21540_gpio_spi.html
I tried to enable GAIN control in GPIO+SPI mode according to the method described in [reference/link], but I failed.

[KF_Kozaki]

Thank you for your response.

I would like to use the PowerAmp module.

As a countermeasure, I commented out the CODEC's SPI-related settings and attempted GAIN control in "SPI+GPIO mode."

As a result, the HCI device's Open processing (bt_hci_open) was successful.

However, it seems that the SPI communication (settings) in the PowerAmp startup sequence is failing.

Is PowerAmp's SPI controlled by the network core?

Is there any way to perform PowerAmp's SPI on the application core side?

Another plan I'm considering is to perform GAIN control in "GPIO mode."

In that case, is it possible for the application side to control the SPI for communication with the nrf21540, and for the network core to control the tx-en/rx-en-gpio?

[Amanda Hsieh]

If you are using the nRF21540 then both the pins and the SPI have to be controlled from the Network core due to timing constraints.