PIO is definetly interesting stuff. This has its own assembly language (.pio) to program. Custom peripherals can be implemented by using this assembly. Raspbe

PIO is definetly interesting stuff. This has its own assembly language (.pio) to program. Custom peripherals can be implemented by using this assembly. Raspberry Pi already provides example programs such as custom I2C, SPI, UART (they are different from the hardware peripherals in the chip), logic analyser, LED controller, and etc[1]. [1]: https://github.com/raspberrypi/pico-examples/tree/master/pio https://github.com/raspberrypi/pico-examples/tree/master/pio