单片机源程序如下:

/*

* Project name:

Seven Segment Display (The 'Hello World' example for the Seven Segment Display)

* Copyright:

(c) Mikroelektronika, 2011.

* Revision History:

20110929:

- initial release (FJ);

* Description:

This code demonstrates how to display number on one 7-segment display

(common cathode). Display is connected to PORTD (RD0..RD7, segment A to

RD0, segment B to RD1, etc); common cathode is connected to the pin RA0 on

PORTA. Number is incremented every 1s.

* NOTES:

- Turn on Seven Segment Display switches SW4.1, SW4.2, SW4.3 and SW4.4. (board specific)

*/

#include "Display_Utils.h"

//unsigned short portd_index;

char seconds, minutes, hours, day, month, year; // Global date/time variables

char i;

// Software I2C connections

/*sbit Soft_I2C_Scl at RC3_bit;

sbit Soft_I2C_Sda at RC4_bit;

sbit Soft_I2C_Scl_Direction at TRISC3_bit;

sbit Soft_I2C_Sda_Direction at TRISC4_bit;

*/

// End Software I2C connections

//--------------------- Reads time and date information from RTC (PCF8583)

void Read_Time() {

I2C1_Start(); // Issue start signal

I2C1_Wr(0xA0); // Address PCF8583, see PCF8583 datasheet

I2C1_Wr(2); // Start from address 2

I2C1_Repeated_Start(); // issue I2C signal repeated start

//I2C1_Start(); // Issue repeated start signal

I2C1_Wr(0xA1); // Address PCF8583 for reading R/W=1

seconds = I2C1_Rd(1); // Read seconds byte

minutes = I2C1_Rd(1); // Read minutes byte

hours = I2C1_Rd(1); // Read hours byte

day = I2C1_Rd(1); // Read year/day byte

month = I2C1_Rd(0); // Read weekday/month byte

I2C1_Stop(); // Issue stop signal

}

//-------------------- Formats date and time

void Transform_Time() {

seconds = ((seconds & 0xF0) >> 4)*10 + (seconds & 0x0F); // Transform seconds

minutes = ((minutes & 0xF0) >> 4)*10 + (minutes & 0x0F); // Transform months

hours = ((hours & 0xF0) >> 4)*10 + (hours & 0x0F); // Transform hours

year = (day & 0xC0) >> 6; // Transform year

day = ((day & 0x30) >> 4)*10 + (day & 0x0F); // Transform day

month = ((month & 0x10) >> 4)*10 + (month & 0x0F); // Transform month

}

/*

void interrupt() {

LATD = 0; // Turn off all 7seg displays

LATD = mask(hours/10u); // bring appropriate value to PORTD

LATA = 0b011111; // turn on appropriate 7seg. display

Delay_ms(2);

LATD=0;

LATD = mask(hours%10u);

LATA = 0b101111;

Delay_ms(2);

LATD=0;

LATD = mask(minutes/10u);

LATA = 0b110111;

Delay_ms(2);

LATD=0;

LATD = mask(minutes%10u);

LATA = 0b111011;

Delay_ms(2);

LATD=0;

LATD = mask(seconds/10u);

LATA = 0b111101;

Delay_ms(2);

LATD=0;

LATD = mask(seconds%10u);

LATA = 0b111110;

Delay_ms(2);

LATD=0;

TMR0L = 0; // reset TIMER0 value

TMR0IF_bit = 0; // Clear TMR0IF

} */

void main() {

ANSELA = 0; // Configure PORTA pins as digital

ANSELD = 0; // Configure PORTD pins as digital

TRISA = 0; // Configure PORTA as output

LATA = 0; // Clear PORTA

TRISD = 0; // Configure PORTD as output

LATD = 0; // Clear PORTD

//T0CON = 0xC4; // Set TMR0 in 8bit mode, assign prescaler to TMR0

//TMR0L = 0; // clear TMROL

//GIE_bit = 1;

//TMR0IE_bit = 1;

I2C1_Init(100000); // initialize I2C communication

//Soft_I2C_Init(); // Initialize Soft I2C communication

do {

Read_Time(); // Read time from RTC(PCF8583)

Transform_Time(); // Format date and time

for (i=0;i<32;i++)

{

LATD = 0; // Turn off all 7seg displays

LATD = mask(hours/10u); // bring appropriate value to PORTD

LATA = 0b011111; // turn on appropriate 7seg. display

Delay_ms(20);

LATD=0;

LATD = mask(hours%10u);

LATA = 0b101111;

Delay_ms(20);

LATD=0;

LATD = mask(minutes/10u);

LATA = 0b110111;

Delay_ms(20);

LATD=0;

LATD = mask(minutes%10u);

LATA = 0b111011;

Delay_ms(20);

LATD=0;

LATD = mask(seconds/10u);

LATA = 0b111101;

Delay_ms(20);

LATD=0;

LATD = mask(seconds%10u);

LATA = 0b111110;

Delay_ms(20);

LATD=0;

}

//Delay_ms(4000); // one second delay

} while(1); // endless loop

}