This example is the bare minimum project needed to initialize, configure, and enable the CS47L63 hardware codec. It plays a sine wave sample using the I2S TX buffer, and then briefly mixes in the codec's noise and tone generators as well.
This code is liberally commented so it should be easy to understand, and it uses legible constants instead of indecipherable hex whenever possible to help self-document the written register values, simplifying experimentation with other available codec features not included in this trivial demo.
The /src/drivers/ directory is copied verbatim from the nRF Connect SDK's nrf5340_audio application, and contains only those files needed to initialize and communicate with the CS47L63.
All other functionality is implemented in a single main.c file, demonstrating the basic steps necessary to reuse Nordic's cs47l63_comm.c driver in your own application. Most configuration is accomplished via direct register manipulation, along with a few other functions from Cirrus Logic's cs47l63.c to handle the complicated frequency-locked loop peripheral.
main.c consists of three distinct sections: NRFX_CLOCKS, NRF_I2S, and HW_CODEC. These are suggested separation points for dividing the application into dedicated modules, but are consolidated here to facilitate quick comprehension and reduce the number of files to read.