DM240001【PDF 29/50 页】BOARD DEMO PIC24/DSPIC33/PIC32

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Explorer 16 Development Board User’s Guide

3.3

dsPIC33F TUTORIAL PROGRAM OPERATION

The dsPIC33F tutorial program is made up of five simple processes which continuously

execute on the dsPIC33FJ256GP710 device:

?

?

?

?

?

Real-Time Clock (RTC) using Timer1

A/D conversion of Potentiometer (R6)

A/D volts to Hex conversion

Hex to Decimal conversion (for LCD display)

LCD Update

The time of day and A/D conversion values are continually updated and displayed on

the LCD. The program demonstrates the basic code to initialize Timer1, enable the

Timer1 oscillator for RTC operation, and initialize the A/D for single channel conversion

of potentiometer, RP5. The LCD is driven via the port pins. The program flow is shown

In addition to the tutorial, the Explorer 16 CD also provides code examples to demon-

strate higher level processing requirements, such as DMA, digital filters and Fast

Fourier Transforms (FFT). See Code Example 2 on the CD for more information.

3.3.1

Voltmeter

The simple tutorial program initializes the A/D module for 12-bit mode with

auto-sampling and conversion of the potentiometer connected to pin AN5 and initial-

izes the respective interrupt. The A/D module continually samples and converts the

potentiometer signal (0 to 3.3 VDC) on analog channel, AN5. When a conversion is

complete, an interrupt is generated and the result in the ADCBUF0 register is copied

into a temporary variable, temp1 . The adc_lcd_update flag is then asserted and the

A/D Interrupt Flag, AD1IF (IFS0<13>), is cleared.

The program exits the Interrupt Service Routine and re-enters the main program loop.

The variable, adc_lcd_update , is evaluated in the main loop to determine if there is

a new A/D conversion value which can be converted and displayed on the LCD.

The primary code modules associated with the operation of the ADC module and

display are:

?

?

?

?

init_ADC.c

isr_ADC.c

advolts.c

hexdec.c

3.3.2

Real-Time Clock

The tutorial program also supports a Real-Time Clock demo. Timer1 is initialized with

interrupts enabled and the external 32.768 kHz oscillator is enabled. Within the Timer1

Interrupt Service Routine (once every second), the variables, hours , minutes and

seconds , are updated, the flag variable, rtc_lcd_update , is asserted and the

Timer1 Interrupt Flag, T1IF (IFS0<3>), is cleared.

The program exits the Interrupt Service Routine and re-enters the main program loop.

The variable, rtc_lcd_update , is evaluated in the main loop to determine if there is

a new time of day value which can be converted and displayed on the LCD.

The primary code modules associated with the operation of the Timer1 module and

display are:

? init_timer1.c

? isr_timer1.c

? hexdec.c

DS51589A-page 25

? 2005 Microchip Technology Inc.

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