Programming Embedded Systems in C and C++

50 Chapter 5: Getting to Know the Hardware

you should add a third section to the board-specific header file. Each line of the

interrupt map becomes a single #define within the file, as shown:

/**********************************************************************

*

* Interrupt Map

*

**********************************************************************/

/*

* Zilog 85230 SCC

*/

#define SCC_INT 17

/*

* On-Chip Timer/Counters

*/

#define TIMER0_INT 8

#define TIMER1_INT 18

#define TIMER2_INT 19

/*

* On-Chip Serial Ports

*/

#define RX_INT 20

#define TX_INT 21

Get to Know the Processor

If you haven’t worked with the processor on your board before, you should take

some time to get familiar with it now. This shouldn’t take very long if you do all of

your programming in C or C++. To the user of a high-level language, most proces-

sors look and act pretty much the same. However, if you’ll be doing any assembly

language programming, you will need to familiarize yourself with the processor’s

architecture and basic instruction set.

Everything you need to know about the processor can be found in the databooks

provided by the manufacturer. If you don’t have a databook or programmer’s

guide for your processor already, you should obtain one immediately. If you are

going to be a successful embedded systems programmer, you must be able to read

databooks and get something out of them. Processor databooks are usually well ...