Write a program for a digital clock using pic16f1829 microcontroller Solution //

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Write a program for a digital clock using pic16f1829 microcontroller

Explanation / Answer

// LCD module connections sbit LCD_RS at RB2_bit; sbit LCD_EN at RB3_bit; sbit LCD_D4 at RB4_bit; sbit LCD_D5 at RB5_bit; sbit LCD_D6 at RB6_bit; sbit LCD_D7 at RB7_bit; sbit LCD_RS_Direction at TRISB2_bit; sbit LCD_EN_Direction at TRISB3_bit; sbit LCD_D4_Direction at TRISB4_bit; sbit LCD_D5_Direction at TRISB5_bit; sbit LCD_D6_Direction at TRISB6_bit; sbit LCD_D7_Direction at TRISB7_bit; // End LCD module connections unsigned short read_ds1307(unsigned short address) { unsigned short r_data; I2C1_Start(); I2C1_Wr(0xD0); //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0 I2C1_Wr(address); I2C1_Repeated_Start(); I2C1_Wr(0xD1); //0x68 followed by 1 --> 0xD1 r_data=I2C1_Rd(0); I2C1_Stop(); return(r_data); } void write_ds1307(unsigned short address,unsigned short w_data) { I2C1_Start(); // issue I2C start signal //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0 I2C1_Wr(0xD0); // send byte via I2C (device address + W) I2C1_Wr(address); // send byte (address of DS1307 location) I2C1_Wr(w_data); // send data (data to be written) I2C1_Stop(); // issue I2C stop signal } unsigned char BCD2UpperCh(unsigned char bcd) { return ((bcd >> 4) + '0'); } unsigned char BCD2LowerCh(unsigned char bcd) { return ((bcd & 0x0F) + '0'); } int Binary2BCD(int a) { int t1, t2; t1 = a%10; t1 = t1 & 0x0F; a = a/10; t2 = a%10; t2 = 0x0F & t2; t2 = t2 > 4; t = 0x0F & t; r = t*10 + r; return r; } int second; int minute; int hour; int hr; int day; int dday; int month; int year; int ap; unsigned short set_count = 0; short set; char time[] = "00:00:00 PM"; char date[] = "00-00-00"; void main() { I2C1_Init(100000); //DS1307 I2C is running at 100KHz CMCON = 0x07; // To turn off comparators ADCON1 = 0x06; // To turn off analog to digital converters TRISA = 0x07; PORTA = 0x00; Lcd_Init(); // Initialize LCD Lcd_Cmd(_LCD_CLEAR); // Clear display // Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off Lcd_Cmd(_LCD_BLINK_CURSOR_ON); Lcd_out(1,1,"Time:"); Lcd_out(2,1,"Date:"); do { set = 0; if(PORTA.F0 == 0) { Delay_ms(100); if(PORTA.F0 == 0) { set_count++; if(set_count >= 7) { set_count = 0; } } } if(set_count) { if(PORTA.F1 == 0) { Delay_ms(100); if(PORTA.F1 == 0) set = 1; } if(PORTA.F2 == 0) { Delay_ms(100); if(PORTA.F2 == 0) set = -1; } if(set_count && set) { switch(set_count) { case 1: hour = BCD2Binary(hour); hour = hour + set; hour = Binary2BCD(hour); if((hour & 0x1F) >= 0x13) { hour = hour & 0b11100001; hour = hour ^ 0x20; } else if((hour & 0x1F) = 60) minute = 0; if(minute < 0) minute = 59; minute = Binary2BCD(minute); write_ds1307(1, minute); //write min break; case 3: if(abs(set)) write_ds1307(0,0x00); //Reset second to 0 sec. and start Oscillator break; case 4: day = BCD2Binary(day); day = day + set; day = Binary2BCD(day); if(day >= 0x32) day = 1; if(day 0x12) month = 1; if(month

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