The Definitive Guide to ARM® Cortex®-M3 and Cortex®-M4 Processors, 3rd Edition

Chapter 24

Software Porting

Abstract

This chapter covers porting software from legacy 8-bit/16-bit processors to ARM^® Cortex^®-M processors, from ARM7TDMI™ to Cortex-M3/M4 processors, and porting software between various Cortex-M processors. It also gives a feature comparison of various Cortex-M processors.

Keywords

porting; data type; optimization; casting; optimization; ARM7TDMI; modes; vector table; alignment

Chapter Outline

24.1 Overview

24.2 Porting software from 8-bit/16-bit MCUs to Cortex^®-M MCUs

24.2.1 Architectural differences

24.2.2 Common modifications

24.2.3 Memory size requirements

24.2.4 Non-applicable optimizations for 8-bit or 16-bit microcontrollers

24.2.5 Example – migrate from 8051 to ARM^® Cortex^®-M

Vector table

Data type

Interrupt ...