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temtronic
Joined: 01 Jul 2010
Posts: 9097
Location: Greensville,Ontario
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 Posted: Wed Nov 07, 2018 12:49 pm |
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OK... NOW I see a BIG problem !
The function rtc_write(...) is SPECIFIC for the INTERNAL Real Time Clock Counter NOT to be used for an EXTERNAL RealTime Clock 'chip' like the DS1307. The DS1307 requires a separate 'driver' to be #included at the start of your program.
You don't say which PIC you're using, but the DS1307.c 'driver' will work for all PICs.
Only a few PICs actually have a builtin( internal) RTCC peripheral.
Jay |
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PROMOD
Joined: 01 Feb 2018
Posts: 42
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| Posted: Thu Nov 08, 2018 11:30 am |
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In the following program there is no "DS1307.c" included in the beginning then how are ds1307_display(), ds1307_write() functions working?
Also there is no "ds1307_read()" function used in the following program then how does the time & date data, stored in ds1307 resister address from 00h to 07h , read by microprocessor and display in the LCD?
| Code: | #define LCD_RS_PIN PIN_D0
#define LCD_RW_PIN PIN_D1
#define LCD_ENABLE_PIN PIN_D2
#define LCD_DATA4 PIN_D3
#define LCD_DATA5 PIN_D4
#define LCD_DATA6 PIN_D5
#define LCD_DATA7 PIN_D6
//End LCD module connections
#include <18F4431.h>
#fuses NOMCLR, INTRC_IO, NOWDT,NOPROTECT,NOLVP
#use delay(clock = 8000000)
#include <lcd.c>
#use fast_io(B)
#use I2C(master, I2C1, FAST = 100000)
char time[] = "TIME: : : ";
char calendar[] = "DATE: / /20 ";
unsigned int8 second, second10, minute, minute10,
hour, hour10, date, date10, month, month10,
year, year10, day;
void ds1307_display(){
second10 = (second & 0x70) >> 4;
second = second & 0x0F;
minute10 = (minute & 0x70) >> 4;
minute = minute & 0x0F;
hour10 = (hour & 0x30) >> 4;
hour = hour & 0x0F;
date10 = (date & 0x30) >> 4;
date = date & 0x0F;
month10 = (month & 0x10) >> 4;
month = month & 0x0F;
year10 = (year & 0xF0) >> 4;
year = year & 0x0F;
time[12] = second + 48;
time[11] = second10 + 48;
time[9] = minute + 48;
time[8] = minute10 + 48;
time[6] = hour + 48;
time[5] = hour10 + 48;
calendar[14] = year + 48;
calendar[13] = year10 + 48;
calendar[9] = month + 48;
calendar[8] = month10 + 48;
calendar[6] = date + 48;
calendar[5] = date10 + 48;
lcd_gotoxy(1, 1); // Go to column 1 row 1
printf(lcd_putc, time); // Display time
lcd_gotoxy(1, 2); // Go to column 1 row 2
printf(lcd_putc, calendar); // Display calendar
}
void ds1307_write(unsigned int8 address, data_){
i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address
i2c_write(address); // Send register address
i2c_write(data_); // Write data to the selected register
i2c_stop(); // Stop I2C
}
void main(){
setup_oscillator(OSC_8MHZ); // Set internal oscillator to 8MHz
setup_adc_ports(NO_ANALOGS); // Configure AN pins as digital
port_b_pullups(TRUE);
output_b(0);
set_tris_b(0x0F);
lcd_init(); // Initialize LCD module
lcd_putc('\f'); // LCD clear
while(TRUE){
if(input(PIN_B2) == 0){
// Convert BCD to decimal
minute = minute + minute10 * 10;
hour = hour + hour10 * 10;
date = date + date10 * 10;
month = month + month10 * 10;
year = year + year10 * 10;
// End conversion
lcd_putc('\f'); // LCD clear
lcd_gotoxy(5, 1); // Go to column 5 row 1
lcd_putc("Minutes:");
delay_ms(200);
while(TRUE)
{
if(input(PIN_B3) == 0)
minute++;
if(minute > 59)
minute = 0;
lcd_gotoxy(8, 2); // Go to column 8 row 2
printf(lcd_putc,"%02u", minute);
if(input(PIN_B2) == 0)
break;
delay_ms(200);
}
lcd_putc('\f'); // LCD clear
lcd_gotoxy(6, 1); // Go to column 6 row 1
lcd_putc("Hour:");
delay_ms(200);
while(TRUE){
if(input(PIN_B3) == 0)
hour++;
if(hour > 23)
hour = 0;
lcd_gotoxy(8, 2); // Go to column 8 row 2
printf(lcd_putc,"%02u", hour);
if(input(PIN_B2) == 0)
break;
delay_ms(200);
}
lcd_putc('\f'); // LCD clear
lcd_gotoxy(6, 1); // Go to column 6 row 1
lcd_putc("Date:");
delay_ms(200);
while(TRUE){
if(input(PIN_B3) == 0)
date++;
if(date > 31)
date = 1;
lcd_gotoxy(8, 2); // Go to column 8 row 2
printf(lcd_putc,"%02u", date);
if(input(PIN_B2) == 0)
break;
delay_ms(200);
}
lcd_putc('\f'); // LCD clear
lcd_gotoxy(6, 1); // Go to column 6 row 1
lcd_putc("Month:");
delay_ms(200);
while(TRUE){
if(input(PIN_B3) == 0)
month++;
if(month > 12)
month = 1;
lcd_gotoxy(8, 2); // Go to column 8 row 2
printf(lcd_putc,"%02u", month);
if(input(PIN_B2) == 0)
break;
delay_ms(200);
}
lcd_putc('\f'); // LCD clear
lcd_gotoxy(6, 1); // Go to column 6 row 1
lcd_putc("Year:");
lcd_gotoxy(7, 2); // Go to column 7 row 1
lcd_putc("20");
delay_ms(200);
while(TRUE){
if(input(PIN_B3) == 0)
year++;
if(year > 99)
year = 0;
lcd_gotoxy(9, 2); // Go to column 9 row 2
printf(lcd_putc,"%02u", year);
if(input(PIN_B2) == 0){
// Convert decimal to BCD
minute = ((minute/10) << 4) + (minute % 10);
hour = ((hour/10) << 4) + (hour % 10);
date = ((date/10) << 4) + (date % 10);
month = ((month/10) << 4) + (month % 10);
year = ((year/10) << 4) + (year % 10);
// End conversion
ds1307_write(1, minute);
ds1307_write(2, hour);
ds1307_write(4, date);
ds1307_write(5, month);
ds1307_write(6, year);
ds1307_write(0, 0); //Reset seconds and start oscillator
delay_ms(200);
break;
}
delay_ms(200);
}
}
i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address
i2c_write(0); // Send register address
i2c_start(); // Restart I2C
i2c_write(0xD1); // Initialize data read
second =i2c_read(1); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(1); // Read hour from register 2
day = i2c_read(1); // Read day from register 3
date = i2c_read(1); // Read date from register 4
month = i2c_read(1); // Read month from register 5
year = i2c_read(0); // Read year from register 6
i2c_stop(); // Stop I2C
ds1307_display(); // Diaplay results delay_ms(50);
}
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Thu Nov 08, 2018 1:53 pm |
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In this code, ds1307_display() & ds1307_write() are standalone functions to do similar operations to the standard driver.
Again this code has it's own read. |
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PROMOD
Joined: 01 Feb 2018
Posts: 42
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| Posted: Thu Nov 08, 2018 8:34 pm |
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| Code: | void ds1307_write(unsigned int8 address, data_){
i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address
i2c_write(address); // Send register address
i2c_write(data_); // Write data to the selected register
i2c_stop(); // Stop I2C
} |
In the above code there is no "i2c_write();" function initialized/defined/declared! Then how in the following portion "i2c_read();" works?
| Code: | i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address
i2c_write(0); // Send register address
i2c_start(); // Restart I2C
i2c_write(0xD1); // Initialize data read
second =i2c_read(1); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(1); // Read hour from register 2
day = i2c_read(1); // Read day from register 3
date = i2c_read(1); // Read date from register 4
month = i2c_read(1); // Read month from register 5
year = i2c_read(0); // Read year from register 6
i2c_stop(); // Stop I2C
ds1307_display(); // Diaplay results delay_ms(50);
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Fri Nov 09, 2018 12:17 am |
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Read the compiler manual....
These are standard supplied functions from the compiler. |
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Mike Walne
Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK
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| Posted: Fri Nov 09, 2018 4:11 am |
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| PROMOD wrote: | Then how in the following portion "i2c_read();" works?
| Code: | i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address
i2c_write(0); // Send register address
i2c_start(); // Restart I2C
i2c_write(0xD1); // Initialize data read
second =i2c_read(1); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(1); // Read hour from register 2
day = i2c_read(1); // Read day from register 3
date = i2c_read(1); // Read date from register 4
month = i2c_read(1); // Read month from register 5
year = i2c_read(0); // Read year from register 6
i2c_stop(); // Stop I2C
ds1307_display(); // Diaplay results delay_ms(50);
} |
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The read works by:-
Giving the I2C the DS1307's address. | Code: | i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address |
The DS1307 register to read from | Code: | | i2c_write(0); // Send register address |
Sending the command to start reading | Code: | i2c_start(); // Restart I2C
i2c_write(0xD1); // Initialize data read |
Then read all the bytes in sequence | Code: | second =i2c_read(1); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(1); // Read hour from register 2
day = i2c_read(1); // Read day from register 3
date = i2c_read(1); // Read date from register 4
month = i2c_read(1); // Read month from register 5
year = i2c_read(0); // Read year from register 6
i2c_stop(); // Stop I2C |
It's all in the compiler manual and the DS1307 data sheet.
You need to read both to get a complete picture.
Mike |
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PROMOD
Joined: 01 Feb 2018
Posts: 42
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| Posted: Fri Nov 09, 2018 9:29 am |
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| Code: | second =i2c_read(1); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(1); // Read hour from register 2
day = i2c_read(1); // Read day from register 3
date = i2c_read(1); // Read date from register 4
month = i2c_read(1); // Read month from register 5
year = i2c_read(0); // Read year from register 6
i2c_stop(); |
Why the above code are not like the following?
| Code: | second =i2c_read(0); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(2); // Read hour from register 2
day = i2c_read(3); // Read day from register 3
date = i2c_read(4); // Read date from register 4
month = i2c_read(5); // Read month from register 5
year = i2c_read(6); // Read year from register 6
i2c_stop(); |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Fri Nov 09, 2018 9:34 am |
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Because the second can't work....
I2C_read accepts a single _bit_ value. 0 or 1, which determines whether is sends a NACK only. Can't accept numbers like 2, 3, 4, 5....
You really need to read the I2C reference, and get an understanding of how I2C works, since this is vital to understanding what the functions actually do.
Last edited by Ttelmah on Fri Nov 09, 2018 9:41 am; edited 1 time in total |
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PROMOD
Joined: 01 Feb 2018
Posts: 42
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| Posted: Fri Nov 09, 2018 9:41 am |
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One more question:
ds1307_write(1, minute);
In the above statement:
1=address
minute=data
Am I correct? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Fri Nov 09, 2018 2:59 pm |
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1, gets transferred into the variable called 'address' in the function, when the function is called.
minute, gets transferred into the variable called data in the function when the function is called.
Understand, 'address' and 'data' are variable names 'given to' the values transferred to the function. The values are copied into these variables at the moment you call the function. |
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PROMOD
Joined: 01 Feb 2018
Posts: 42
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| Posted: Fri Nov 09, 2018 8:37 pm |
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I am all most done with this program. I have learned many things by this program.
One more things I need to know why the following conditions have been used in the program. Is there any problem if I eliminate those conditions?
| Code: | if(input(PIN_B2) == 0)
..................
..................
if(input(PIN_B3) == 0)
...................
.................
if(input(PIN_B3) == 0)
......................................
if(input(PIN_B3) == 0)
.....................................
if(input(PIN_B3) == 0)
...................................
if(input(PIN_B2) == 0)
.................................
if(input(PIN_B3) == 0)
................................
if(input(PIN_B2) == 0) |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Sat Nov 10, 2018 2:26 am |
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Depends what you want _your_ program to do?.
These are buttons to allow you to set the clock. |
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PROMOD
Joined: 01 Feb 2018
Posts: 42
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| Posted: Wed Nov 14, 2018 9:30 am |
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I just want to read time and date from ds1307 and to display it in LCD monitor. To do so I have written the following code. But its not working. Why is it not working?
| Code: | void ds1307_display()
{
second10 = (second & 0x70) >> 4;
second = second & 0x0F;
minute10 = (minute & 0x70) >> 4;
minute = minute & 0x0F;
hour10 = (hour & 0x30) >> 4;
hour = hour & 0x0F;
date10 = (date & 0x30) >> 4;
date = date & 0x0F;
month10 = (month & 0x10) >> 4;
month = month & 0x0F;
year10 = (year & 0xF0) >> 4;
year = year & 0x0F;
time[12] = second + 48;
time[11] = second10 + 48;
time[9] = minute + 48;
time[8] = minute10 + 48;
time[6] = hour + 48;
time[5] = hour10 + 48;
calendar[14] = year + 48;
calendar[13] = year10 + 48;
calendar[9] = month + 48;
calendar[8] = month10 + 48;
calendar[6] = date + 48;
calendar[5] = date10 + 48;
lcd_gotoxy(1, 1); // Go to column 1 row 1
printf(lcd_putc, time); // Display time
lcd_gotoxy(1, 2); // Go to column 1 row 2
printf(lcd_putc, calendar); // Display calendar
}
void main()
{
setup_oscillator(OSC_8MHZ); // Set internal oscillator to 8MHz
setup_adc_ports(NO_ANALOGS); // Configure AN pins as digital
port_b_pullups(TRUE);
output_b(0);
set_tris_b(0x0F);
lcd_init(); // Initialize LCD module
lcd_putc('\f'); // LCD clear
i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address
i2c_write(0); // Send register address
i2c_start(); // Restart I2C
i2c_write(0xD1); // Initialize data read
second =i2c_read(1); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(1); // Read hour from register 2
day = i2c_read(1); // Read day from register 3
date = i2c_read(1); // Read date from register 4
month = i2c_read(1); // Read month from register 5
year = i2c_read(0); // Read year from register 6
i2c_stop(); // Stop I2C
ds1307_display(); // Display results
delay_ms(50);
}
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temtronic
Joined: 01 Jul 2010
Posts: 9097
Location: Greensville,Ontario
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| Posted: Wed Nov 14, 2018 10:55 am |
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quick reply..
NOT a complete program !
1) NO processor defined in 1st line of the program
2) call to function lcd_init(); yet lcd_init() is NOT in program. It's probably in an LCD_module driver file, that's not #included...
3) calls to I2C, but again no setup as to WHERE the I2C device is located, speed, type, etc.
You need to post the complete program.
You should get the PIC to flash an LED (the '1Hz LED' program).
THEN get the LCD to work, typically get 'Hello World' to display on it.
THEN proceed with the RTC portion of code.
Build upon known working code, one step at a time.
Jay |
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PROMOD
Joined: 01 Feb 2018
Posts: 42
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| Posted: Wed Nov 14, 2018 8:56 pm |
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The following is not working!
| Code: | #define LCD_RS_PIN PIN_B0
#define LCD_RW_PIN PIN_B1
#define LCD_ENABLE_PIN PIN_B2
#define LCD_DATA4 PIN_B3
#define LCD_DATA5 PIN_B4
#define LCD_DATA6 PIN_B5
#define LCD_DATA7 PIN_B6
#include <18F4431.h>
#device adc=10 // setting the adc at 10 bit
#fuses NOMCLR, INTRC_IO, NOWDT,NOPROTECT,NOLVP // setting Cristal Clock, No watch dog timer and No low voltage protection
#use delay(clock=8000000)
#use fast_io(B)
#use I2C(master, I2C1, FAST = 100000)
#include <lcd.c>
char time[] = "TIME: : : ";
char calendar[] = "DATE: / /20 ";
unsigned int8 second, second10, minute, minute10,
hour, hour10, date, date10, month, month10,
year, year10, day;
void ds1307_display()
{
second10 = (second & 0x70) >> 4;
second = second & 0x0F;
minute10 = (minute & 0x70) >> 4;
minute = minute & 0x0F;
hour10 = (hour & 0x30) >> 4;
hour = hour & 0x0F;
date10 = (date & 0x30) >> 4;
date = date & 0x0F;
month10 = (month & 0x10) >> 4;
month = month & 0x0F;
year10 = (year & 0xF0) >> 4;
year = year & 0x0F;
time[12] = second + 48;
time[11] = second10 + 48;
time[9] = minute + 48;
time[8] = minute10 + 48;
time[6] = hour + 48;
time[5] = hour10 + 48;
calendar[14] = year + 48;
calendar[13] = year10 + 48;
calendar[9] = month + 48;
calendar[8] = month10 + 48;
calendar[6] = date + 48;
calendar[5] = date10 + 48;
lcd_gotoxy(1, 1); // Go to column 1 row 1
printf(lcd_putc, time); // Display time
lcd_gotoxy(1, 2); // Go to column 1 row 2
printf(lcd_putc, calendar); // Display calendar
}
void main()
{
setup_oscillator(OSC_8MHZ); // Set internal oscillator to 8MHz
//setup_adc_ports(NO_ANALOGS); // Configure AN pins as digital
port_b_pullups(TRUE);
output_b(0);
//set_tris_b(0x00);
lcd_init(); // Initialize LCD module
lcd_putc('\f');
while(1)
{
i2c_start(); // Start I2C
i2c_write(0xD0); // DS1307 address
i2c_write(0); // Send register address
i2c_start(); // Restart I2C
i2c_write(0xD1); // Initialize data read
second =i2c_read(1); // Read seconds from register 0
minute =i2c_read(1); // Read minuts from register 1
hour = i2c_read(1); // Read hour from register 2
day = i2c_read(1); // Read day from register 3
date = i2c_read(1); // Read date from register 4
month = i2c_read(1); // Read month from register 5
year = i2c_read(0); // Read year from register 6
i2c_stop(); // Stop I2C
ds1307_display(); // Diaplay results delay_ms(50);
}
}
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