كود:
/*
* Project name:
RTC_Read (Reading date/time stamp from PCF8583 through I2C)
* Copyright:
(c) MikroElektronika, 2005-2008
* Revision History:
20050130:
- initial release;
* Description:
This project is simple demonstration how to read date and time from PCF8583
RTC (real-time clock). The code can be used with any MCU that has MSSP
module at PORTC. Date and time are printed at LCD.
* Test configuration:
MCU: PIC16F877A/PIC18F4520
Dev.Board: EasyPIC5
Oscillator: HS, 8.000MHz
Ext. Modules: RTC module (PCF8583), LCD 2x16 chars
SW: mikroC v8.0
* NOTES:
- In order to use the example, address pin A0 of PCF8583 must be set to 0V!
- For proper I2C communication, pins on PORTC must be in the pull-up mode,
and the LEDs on board switched OFF!
*/
unsigned char sec, min1, hr, day, mn, year;
char *txt, tnum[4];
void Zero_Fill(char *value) { // fill text repesentation
if (value[1] == 0) { // with leading zero
value[1] = value[0];
value[0] = 48;
value[2] = 0;
}
}//~
//--------------------- Reads time and date information from RTC (PCF8583)
void Read_Time(char *sec, char *min, char *hr, char *day, char *mn, char *year) {
I2C_Start();
I2C_Wr(0xA0);
I2C_Wr(2);
I2C_Repeated_Start();
I2C_Wr(0xA1);
*sec =I2C_Rd(1);
//while (I2C_Is_Idle() == 0) ;
*min =I2C_Rd(1);
//while (I2C_Is_Idle() == 0) ;
*hr =I2C_Rd(1);
//while (I2C_Is_Idle() == 0) ;
*day =I2C_Rd(1);
//while (I2C_Is_Idle() == 0) ;
*mn =I2C_Rd(0);
//while (I2C_Is_Idle() == 0) ;
I2C_Stop();
}//~
//-------------------- Formats date and time
void Transform_Time(char *sec, char *min, char *hr, char *day, char *mn, char *year) {
*sec = ((*sec & 0xF0) >> 4)*10 + (*sec & 0x0F);
*min = ((*min & 0xF0) >> 4)*10 + (*min & 0x0F);
*hr = ((*hr & 0xF0) >> 4)*10 + (*hr & 0x0F);
*year = (*day & 0xC0) >> 6;
*day = ((*day & 0x30) >> 4)*10 + (*day & 0x0F);
*mn = ((*mn & 0x10) >> 4)*10 + (*mn & 0x0F);
}//~
//-------------------- Output values to LCD
void Display_Time(char sec, char min, char hr, char day, char mn, char year) {
ByteToStr(day,tnum);
txt = rtrim(tnum);
Zero_Fill(txt);
LCD_Out(1,6,txt);
ByteToStr(mn,tnum);
txt = rtrim(tnum);
Zero_Fill(txt);
LCD_Out(1,9,txt);
LCD_Chr(1,15,52+year);
ByteToStr(hr,tnum);
txt = rtrim(tnum);
Zero_Fill(txt);
LCD_Out(2,6,txt);
ByteToStr(min,tnum);
txt = rtrim(tnum);
Zero_Fill(txt);
LCD_Out(2,9,txt);
ByteToStr(sec,tnum);
txt = rtrim(tnum);
Zero_Fill(txt);
LCD_Out(2,12,txt);
}//~
//------------------ Performs project-wide init
void Init_Main() {
ADCON1 = 0x0F;
Lcd_Config(&PORTB, 4, 5, 6, 3, 2, 1, 0); // Lcd_Init_EP5, see Autocomplete
I2C_Init(100000); // initialize I2C
txt = "Date:"; // prepare and output static text on LCD
LCD_Out(1,1,txt);
LCD_Chr(1,8,':');
LCD_Chr(1,11,':');
txt = "Time:";
LCD_Out(2,1,txt);
LCD_Chr(2,8,':');
LCD_Chr(2,11,':');
txt = "200";
LCD_Out(1,12,txt);
LCD_Cmd(LCD_CURSOR_OFF); // cursor off
}//~
//----------------- Main procedure
void main() {
Init_Main(); // perform initialization
while (1) {
Read_Time(&sec,&min1,&hr,&day,&mn,&year); // read time from RTC(PCF8583)
Transform_Time(&sec,&min1,&hr,&day,&mn,&year); // format date and time
Display_Time(sec, min1, hr, day, mn, year); // prepare and display on LCD
Delay_ms(1000); // wait 1s
}
}
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سؤال حول PCF8583
