Building digital clock using DS1307 RTC with PIC16F877A microcontroller | Digital clock part-3
ฝัง
- เผยแพร่เมื่อ 1 ต.ค. 2024
- In this lecture you will acquire knowledge on interfacing DS1307 RTC with the microcontroller PIC16F877A and building digital clock with pic microcontroller ,This is a course on programming in MPLAB X IDE using XC8 compiler for the microcontroller PIC16F877A.
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DS1307_read(DS1307_address,0x00); this code show error
SSPBUF = DS1307_address; this also
What is the error ..?
sir instead of c how to convert these code into assembler language i have an assignment that is we should write the program into assembler language What can i do
You're awesome, can you give me the code that can be edited with a button?
Very good explanation. You did all the basics of I2C protocol in detail
@Anandhu thanks for your feedback
Sir, sorry for asking continuous questions. I have some doubts in hardware mode. Should we use crystal for DS1307? If yes means, what freq should we buy? Also do we need pull up resistors between the i2c pins of pic and ds1307? Because the hardware model you showed doesnt had any of these? could you pls, share what you exactly did in hardware mode in detail sir. Thank you.
Yes of course you have to provide crystal for ds1307 and also we need to provide pull up for i2c lines, it’s ok I can help you anytime you can ask as many questions until your doubts are cleared no issues
Also refer the schematic I have provided for the hardware circuit
@@SMtrainingacademy thanks a lot
An excellent tutorial. I watched all the three parts of the I2C clock lesson.
I have one question. I built the circuit in proteus as explained and it worked fine. but when I removed the I2C debugger the DS1307 doesn't work and the LCD was only showing zeroes in place of seconds, minutes, etc. what is the reason for this?
Hello Kasun
It actually happens sometimes in proteus I have also faced it,but in hardware it will work fine 😊
@@SMtrainingacademy Thank you for the reply... :) it means it is a kind of a bug in proteus ?
May be @Kasun
The lecture is good but maybe you need to provide link for soft copy as not everything is clear from the video
Ofcourse I will try
@@SMtrainingacademy sir please provide code
@@prabhatkumar3547 Please go to this page and click download button
smtrainingacademy.com/course/chapter/view/eyJpdiI6ImV4eE9IUHBTZ3FCZTdIZis5WWxVNnc9PSIsInZhbHVlIjoidDZOTHhVWkFMREZGc0d4a2w2ZWkrQT09IiwibWFjIjoiMzgzNDI2ZjExYjA3ZjY5MGQ3ZDJmNGNhMGYzMTk0ZmM3MTAxMzI5Y2ExMGYxZTkzYWRlYTYxYmQ5YjQxZjYzNyJ9
@@prabhatkumar3547 bro did you simulate this code in proteus. I did but not getting real clock..please reply ASAP possible..
#include
#define _XTAL_FREQ 20000000
#define LCD PORTTD
#define RS RB0
#define RW RB1
#define EN RB2
// rtc micros for ds1317
#define DS1317_address 0xD0
#define second 0x00
#define minute 0x01
#define hour 0x02
#define day 0x03
#define date 0x04
#define month 0x05
#define year 0x06
#define control_reg 0x07
void DS1307_write(char sec, char min, char hr, char _day, char date_, char month_, char year_);
void DS1307_read(char slave_address,char register_address);
char decimal_to_bcd(unsigned char value);
void bcd_to_ascii(unsigned char value);
void delay(unsigned int delay);
void lcd_cmd(unsigned char cmd);
void lcd_data(unsigned char data);
void lcd_Init();
void lcd_word(const unsigned char *words);
unsigned char __sec,__min,__hr,__day,__month,__yr,__con;
void main(void)
{
TRISC = 0XFF;
SSPCON = 0X28;
SSPADD =49;
TRISB=TRISD=0X00;
PORTB=PORTD = 0X00;
lcd_Init();
lcd_cmd(0x80);
lcd_word("CLOCK:");
lcd_cmd(0xC0);
lcd_word("DATE:");
DS1307_write(0, 59, 2, 1, 26, 12, 19);
__delay_ms(300);
while(1)
{
__delay_ms(20);
DS1307_read(DS1307_address,0x00);
}
}
void DS1307_write(char _second, char _minute, char _hour, char _day, char _date, char _month, char _year)
{
SEN=1;
while(SEN);
SSPIF = 0;
SSPBUF = DS1307_address;
while(!SSPIF);
SSPIF = 0;
if(ACKSTAT)
{
PEN = 1;
while(PEN);
return;
}
SSPBUF = second;
while(!SSPIF);
SSPIF = 0;
if(ACKSTAT)
{
PEN = 1;
while(PEN);
return;
}
SSPBUF = decimal_to_bcd(_second);
while(SSPIF);
SSPIF = 0;
SSPBUF = decimal_to_bcd(_minute);
while(!SSPIF);
SSPIF = 0;
SSPBUF = decimal_to_bcd(_hour);
while(!SSPIF);
SSPIF = 0;
SSPBUF = decimal_to_bcd(_day);
while(!SSPIF);
SSPIF = 0;
SSPBUF = decimal_to_bcd(_date);
while(!SSPIF);
SSPIF = 0;
SSPBUF = decimal_to_bcd(_month);
while(!SSPIF);
SSPIF = 0;
SSPBUF = decimal_to_bcd(_year);
while(!SSPIF);
SSPIF = 0;
SSPBUF = 0x00;
while(!SSPIF);
SSPIF = 0;
PEN=1;
while(PEN);
}
void DS1307_READ(char slave_address,char register_address)
{
SEN = 1;
while(SEN);
SSPIF = 0;
SSPBUF =slave_address;
while(!SSPIF);
SSPIF = 0;
if(ACKSTAT)
{
PEN = 1;
while(PEN);
return;
}
SSPBUF = register_address;
while(!SSPIF);
SSPIF = 0;
if(ACKSTAT)
{
PEN = 1;
while(PEN);
return;
}
RSEN = 1;
while(RSEN);
SSPIF = 0;
SSPBUF = (slave_address + 1);
while(!SSPIF)
SSPIF = 0;
if(ACKSTAT)
{
PEN=1;
while(PEN);
return;
}
RCEN = 1;
while(! BF);
__sec = SSPBUF;
ACKDT = 0;
ACKDT = 1;
while(ACKEN);
RCEN = 1;
while(!BF)
__min = SSPBUF;
ACKDT = 0;
ACKEN = 1;
while(ACKEN);
RCEN = 1;
while(!BF);
__hr = SSPBUF;
ACKDT = 0;
ACKDT = 1;
while(ACKEN);
RCEN = 1;
while(!BF);
__day = SSPBUF;
ACKDT = 0;
ACKDT = 1;
while(ACKEN);
RCEN = 1;
while(!BF);
__date = SSPBUF;
ACKDT = 0;
ACKDT = 1;
while(ACKEN);
RCEN = 1;
while(!BF);
__month = SSPBUF;
ACKDT = 0;
ACKDT = 1;
while(ACKEN);
RCEN = 1;
while(!BF);
__yr = SSPBUF;
ACKDT = 0;
ACKDT = 1;
while(ACKEN);
RCEN = 1;
while(!BF);
__con = SSPBUF;
ACKDT = 0;
ACKDT = 1;
while(ACKEN);
PEN = 1;
while(PEN);
lcd_cmd(0x88);
bcd_to_ascii(__hr);
lcd_data(':');
bcd_to_ascii(__min);
lcd_data(':');
bcd_to_ascii(__sec);
lcd_cmd(0xC8);
bcd_to_ascii(__date);
lcd_data('/');
bcd_to_ascii(__month);
lcd_data('/');
bcd_to_ascii(__yr);
}
In hardware mode, did you used the potentiometer and the 5v source for the vss, vdd and vee for the lcd module
Yes I just did the same as per your understanding
And in the code part, you mentioned 1 for using 'day' register in ds1307, but why the LCD doesn't showing what day it is?
Can you mention the time frame in video where you found the problem
My doubt is why you are not printing the 'day' in the lcd?
In the code part, ds1307 write function, you declared it as 1.
Hello, why you upload a different proteus schematic in the website. But in the video you just used pic and you didnt used any crystal for pic. And you used I2C debugger here in the video and not in the proteus schematic which you uploaded in the website along with the code. Please say why you did that. Thank you
Which schematic is different can you please show that ..?
@@SMtrainingacademy I have another doubt why the LCD module Vss, Vdd and Vee are not connected to any power source? How it is running without any source? and there are no crystal connected to the pic and ds1307? why? could you explain this in detail? please!
@@amudhapriyane4534 Notice that in simulation we don’t require to provide power source and crystal for controller but in hardware we want to provide which I have already provided to you the actual circuit in the schematic diagram.please remember simulation is quite different than hardware but code will be the same
@@SMtrainingacademy okay. Thanks for your response sir. I understood
@@amudhapriyane4534 😊
is there anyother way to dump the code in pic16f877a board without PICkit3. I used Rs232 cable with pic isp software downloader to dump it, but is showing bad acknowledgement error. Do you how to resolve this?
PIC IC with bootloader is able to program using rs232 and without bootloader you cannot perform it
@@SMtrainingacademy Now we bought pickit3, the program works fine. We used MPLAB IPE for dumping the code. The interpreter said program was successfully uploaded. But we are not getting any output in the LCD. While using MPLAB IDE, we couldn't even upload the program. Do you know what could be the issue with out setup?
@@amudhapriyane4534 what is the config bits you have used
The above drive link has the code we used, you can refer that for the config bits.
@@amudhapriyane4534 which link can you share it again
how can we use alarm
You have to write the logic for settings and alarm
is there any error in this code
pls help
No it will work well
@@SMtrainingacademy
DS1307_read(DS1307_address,0x00);
SSPBUF = DS1307_address;
this two lines show error
@@tamilwingsyoutube3767 what error is showing