DM240001【PDF 27/50 页】BOARD DEMO PIC24/DSPIC33/PIC32

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EXPLORER 16 DEVELOPMENT

BOARD USER ’S GUIDE

Chapter 3. Explorer 16 Tutorial Programs

3.1

3.2

INTRODUCTION

This chapter provides a high-level overview of the PIC24 and dsPIC33F firmware

programmed during the tutorial exercise in the previous chapter.

PIC24 TUTORIAL PROGRAM OPERATION

The PIC24 tutorial program is made up of three components which are individually

displayed on the LCD. The program is used to demonstrate the new Parallel Master

Port (PMP) module which is used to drive the LCD, as well as the new Real-Time

Clock/Calendar module (RTCC). The program flow is shown in Figure 3-1.

3.2.1

PIC24 Features

Features mode displays a continuous description of the PIC24FJ128GA010 device

feature set. To exit the display and continue to the next mode, press S4.

3.2.2

Voltmeter/Temperature

Voltmeter/Temperature mode uses the code modules, vbanner.c and ADC.c , and

the A/D module to measure analog signals from the board and convert them for display

on the LCD. The voltage is taken from the potentiometer (R6) and displays a voltage

between 0.00V and 3.29V on line 1 of the LCD. Temperature is from a TC1074A analog

thermal sensor (U5). The temperature is displayed on line 2 of the LCD and auto-

matically alternates between Celsius and Fahrenheit values. The voltage and

temperature are updated continuously.

This mode also lets users store the current temperature in the on-board serial

EEPROM by pressing S5. Pressing S6 switches the display between current and

stored temperature values. An ‘M’ on the right side of the LCD indicates that a stored

temperature value is being displayed.

To exit and continue to the next mode, press S4.

3.2.3

Clock/Calendar

Clock/Calendar mode uses code in the modules, rtcc.c and tbanner.c . Once this

mode is entered from the main menu, a Real-Time Clock will start counting from

10:00:00, and display the date and day for Oct. 10, 2005. The new RTCC module and

a 32 kHz clock crystal are used to provide the Real-Time Clock with day/date calendar.

In Clock/Calendar mode, the user-defined push buttons do the following:

? S3 toggles the Clock Set mode, which allows the user to set the date and time.

Setup mode starts with the tens digit of the hour in the time display.

? S4 accepts the value of the current item and moves cursor to the next item.

? S5 decrements the currently selected item.

? S6 increments the currently selected item.

Pressing S3 once superimposes a flashing cursor over the tens digit of the hour in the

time display. Each press of S4 moves the cursor sequentially through the digits of the

time display, then the month, day and year. Pressing S3 at any time in the process

returns to the regular clock/calendar display.

? 2005 Microchip Technology Inc.

DS51589A-page 23

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