2020年09月11日 | mickoC 编写pic18f45k22读取i2c接口RTC pcf8583时间显示在数码管

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

}