The popularity of Raspberry Pico board powered by RP2040 microcontroller has made every reader wanting to know more about the board and chip. So today we will be talking about RP2040’s Programmable IOs, a feature that makes it different from most other microcontroller boards. The two PIO blocks or let’s call it the hardware interfaces in the RP2040 have four state machines each. These two PIO blocks can simultaneously execute programs to manipulate GPIOs and transfer raw data. Now, what do these state machines do? Well, the PIO state machines execute the programs fetched from various sources. Sometimes the programs are taken from the PIO library (UART, SPI, or I2C) or user software. Why Programmable I/O? All the boards usually come with hardware support for digital communications protocols such as I2C, SPI, and UART. However, if you plan to use more of these interfaces than what is available on the board, you can use the programmable IOs provided in RP2040 […]
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