AN1921 Motorola / Freescale Semiconductor, AN1921 Datasheet

AN1921

Manufacturer Part Number

AN1921

Description

AN1921 General DSP568xx Interface Examples using the Embedded SDK

Manufacturer

Motorola / Freescale Semiconductor

Datasheet

1.AN1921.pdf (32 pages)

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Semiconductor Application Note

General DSP568xx

Interface Examples using

the Embedded SDK

Joseph R. Pasek

MOTOROLA

The purpose of this application note is to describe the process

of interfacing different devices to the Motorola DSP56824

processor

Metrowerks’ C compiler. This is in addition to the devices

available on the DSP’s EVM card described in the associated

SDK documentation. Examples include interfacing to LCDs,

Keypads, ADCs and pressure sensors.

It is assumed that the reader has some familiarity with both

the Metrowerks’ IDE and Motorola’s Embedded Software

Development Kit (SDK).

As the DSP568xx family assumes more microcontroller

roles, it must be capable of working in the embedded

environment, on occasion requiring some form of user

interface. This user interface is usually characterized by some

combination of LCD, LEDs, buttons, and keypad. The

combination used in this note is the LCD and 4x4 keypad.

The LCD used here is NetMedia’s Serial LCD+, which is a

4x20 LCD serial display. It is an off-the-shelf unit (see

Figure

LCD display, the Serial LCD+ provides a keypad interface,

an eight channel 10-bit A/D converter, an EEPROM and

RS-232 interface.

Introduction

LCD and Keypad User Interface

Description

1) with several interesting features. In addition to the

using

Motorola’s

Embedded

SDK

and

1. Introduction.....................................1

2. LCD and Keypad User Interface

3. Interfacing to Serial Devices Using

4. Integrating Devices With the EVM

Appendices

A. Details of NewMedia’s Serial

B. TI’s TLC2543...............................24

C. Header Files TLC2543.h and

D. Determining the Pressure

E. Motorola’s MPX4115A Integrated

Description.................................1

the SPI Port ................................7

Board........................................15

lcd.h .........................................27

Transducer’s Altitude Pressure

Adjustment...............................28

Pressure Sensor ........................29

LCD+.......................................20

Contents

(Motorola Order Number)

Order by AN1921/D

Rev. 1.0, 04/2001

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