RP2040 Assembly Language Programming: ARM Cortex-M0+ on the Raspberry Pi Pico

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

S. SmithRP2040 Assembly Language Programminghttps://doi.org/10.1007/978-1-4842-7753-9_10

10. How to Initialize and Interact with Programmable I/O

Stephen Smith¹  

(1)

Gibsons, BC, Canada

 

So far, we’ve studied the Assembly Language instructions for the ARM Cortex-M0+ processor. In this chapter, we put that aside and look at a new Assembly Language syntax quite different from ARM’s. The RP2040 contains eight programmable I/O (PIO) processors that are programmed as state machines with their own Assembly Language instructions. There is a tool in the SDK, pioasm, which assembles these in a similar manner to the GNU Assembler we have used.

The RP2040 contains several ...