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_13

13. Multiprocessing

Stephen Smith¹  

(1)

Gibsons, BC, Canada

 

The RP2040 contains two ARM Cortex-M0+ CPU cores; in this chapter, we look at how to run code on the second processor. The second processor is in a power-conserving sleep state by default; we’ll see how to wake it up and assign it work to process. Raspberry added two helpful features to the RP2040 for working with both CPU cores:

1. 1.

   There are two FIFOs: one for core 0 to send data to core 1 and the other for core 1 to send data to core 0.

    
2. 2.

   There are 32 spinlocks that can be assigned to control access to shared ...