HLK-RM04 with I2S and SPI

One my project requires mono audio and graphics LCD over WiFi. HLK-RM04 is very cheap board and can do just what i need, with some hacks :)

In this example i use simple app to stream audio over WiFi to this boad. I2S is using DMA and double buffering. Audio is generated using 8bit mono DAC, MCP4801.

SPI is semi-hardware; clock and data lines are hardware SPI, but chip select is hacked GPIO inide SPI driver. This is way faster than bitbanging. I have also included simple graphics library.

Try yourself.