====== What is RP2040 PIO ? ======

The RP2040 PIO (Programmable Input Output) is a feature of the RP2040 microcontroller that allows users to create custom interfaces or implement specific protocols that may not be natively supported by the microcontroller.

 It consists of two PIO blocks, each containing four state machines that can execute small programs independently of the CPU (Cortex-M0+). These state machines can manage inputs and outputs in a deterministic way, ensuring precise timing regardless of the CPU load.

 The PIOs are programmed using a low-level assembly-like language, which enables efficient and fast execution, making it possible to handle complex tasks such as VGA or DVI output. 

(Source: Gemini)