DM300019 datasheet(29/50 Pages) MICROCHIP

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dsPICDEM™ 80-PIN STARTER

DEVELOPMENT BOARD USER’S GUIDE

DS51584B-page 25

Chapter 3. Demonstration Program Operation

3.1

INTRODUCTION

The dsPICDEM 80-Pin Starter Development Board is shipped with example

applications programmed into the dsPIC DSC device. These examples exercise

several of the dsPIC DSC peripherals such as the 12-bit Analog-to-Digital Converter

(ADC) and UART interfaces. This chapter provides an overview of the demonstration

code. Detailed information on the dsPICDEM 80-Pin Starter Development Board

hardware is presented in Chapter 4. “dsPICDEM™ Development Board Hardware”

and Appendix A. “Drawings and Schematics”.

3.2

HIGHLIGHTS

Items discussed in this chapter are:

• Demonstration Program Summary

• Demonstration Code Operation

•Board Self-test

3.3

DEMONSTRATION PROGRAM SUMMARY

The preprogrammed demonstration program includes two functionally separate code

modules:

• Demonstration code module

• Board self-test code module

These two code modules have been combined into one composite program and coded

into the device. The board self-test code module has been included on the CD as a

library archive only and is briefly discussed at the end of this section. The following

sections present the operation of each module.

When power is applied to the dsPICDEM 80-Pin Starter Development Board, the dsPIC

DSC device begins executing the demonstration program, which consists of three

distinct functional tasks:

• Interrupt processing

• Analog-to-digital conversion

• Digital-to-analog conversion

3.3.1

Interrupt Processing

To illustrate interrupt processing, the demonstration program uses switches S1 and S2

as signals to drive LEDs RD4 and RD5 (output devices). When switch S1 is pressed

(to represent an interrupt), LED RD4 blinks at a 1 Hz rate (once per second) until switch

S1 is pressed again. Similarly, when switch S2 is pressed, LED RD5 blinks until switch

S2 is pressed again. Timer 1 is set up to interrupt every half second.

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