Propeller Programming: Using Assembler, Spin, and C

© Sridhar Anandakrishnan 2018

Sridhar AnandakrishnanPropeller Programminghttps://doi.org/10.1007/978-1-4842-3354-2_13

13. Programming in Cog-C Mode

Sridhar Anandakrishnan¹ 

(1)

Department of Geosciences, University Park, Pennsylvania, USA

 

In the previous chapter, we programmed the Propeller in the large memory model where the code was all stored in hub memory and instructions were downloaded to a cog one at a time for execution. This exacts a performance penalty. If the code you want to run on a cog will fit entirely within the cog (496 longs), then you can write that code in such a way that it is copied to the cog all at once and runs on the cog natively.

Figure 13-1

A rotary snow plough used for clearing track. From “The World’s Work, Volume 1,” WH ...