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jake1272
Joined: 15 Mar 2021
Posts: 37
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 Posted: Mon Apr 12, 2021 7:53 am |
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In the main code :
I removed the I2C1 and the LCD does display the date and time in a wrong format and the time it is not running as well
| Code: | #use I2C(MASTER, SLOW = 100000, STREAM = DS3231_STREAM)
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| Code: | | #use I2C(MASTER, I2C1, SLOW = 100000, STREAM = DS3231_STREAM) |
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temtronic
Joined: 01 Jul 2010
Posts: 9241
Location: Greensville,Ontario
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| Posted: Mon Apr 12, 2021 8:14 am |
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| That RTC has an 'osc-enable' bit, maybe the driver doesn't enable the enable ?? It 'should', by default be enabled, at least for a 5 volt PIC, if my fuzzy memory serves me right. You do HAVE a battery installed on the module ?? |
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jake1272
Joined: 15 Mar 2021
Posts: 37
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| Posted: Mon Apr 12, 2021 8:19 am |
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| temtronic wrote: | | That RTC has an 'osc-enable' bit, maybe the driver doesn't enable the enable ?? It 'should', by default be enabled, at least for a 5 volt PIC, if my fuzzy memory serves me right. You do HAVE a battery installed on the module ?? |
Yes, I do have a 3.6V battery installed on the module. |
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jake1272
Joined: 15 Mar 2021
Posts: 37
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| Posted: Mon Apr 12, 2021 8:25 am |
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| Jerson wrote: | To begin with debugging your code, I would
* comment all calls to the RTC driver functions.
* Replace the print statement with dummy values for each variable you print
* If you succeed with this, then re-enable RTC_get and check if it prints some values
Unless this works, do not check other RTC functions. |
Thank you very much for the suggestion |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Apr 12, 2021 4:27 pm |
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| jake1272 wrote: | I
removed the I2C1 and the LCD does display the date and time in a wrong format and the time it is not running as well.
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Post what you see on the LCD.
Post the date which shows in a wrong format.
If you see 00:00:00 for the time, then post that to us.
The more information the better. Withholding information makes it
harder for people to help you.
Also, I think you missed my post here, where I asked you to use
the example main() from the simple circuits website, instead of
your modified version. The simple circuits code initializes the ds3231
with a date and time. Your code does not do this.
http://www.ccsinfo.com/forum/viewtopic.php?t=59278&start=24 |
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jake1272
Joined: 15 Mar 2021
Posts: 37
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| Posted: Tue Apr 13, 2021 12:13 am |
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| PCM programmer wrote: | | jake1272 wrote: | I
removed the I2C1 and the LCD does display the date and time in a wrong format and the time it is not running as well.
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Post what you see on the LCD.
Post the date which shows in a wrong format.
If you see 00:00:00 for the time, then post that to us.
The more information the better. Withholding information makes it
harder for people to help you.
Also, I think you missed my post here, where I asked you to use
the example main() from the simple circuits website, instead of
your modified version. The simple circuits code initializes the ds3231
with a date and time. Your code does not do this.
http://www.ccsinfo.com/forum/viewtopic.php?t=59278&start=24 |
I did try his code, it doesnt change anything...I think there is a problem between the master and slave.I am not really sure
So the LCD print:
165:165:16 T:-00.25°C
Sat: 165/165/20165
A1: 45:85:00 ON
A2: 45:85:00 ON |
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Jerson
Joined: 31 Jul 2009
Posts: 125
Location: Bombay, India
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| Re: Problem with DS3231 and PIC16F1847 |
| Posted: Tue Apr 13, 2021 12:55 am |
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I have made a few changes that will allow you to test the code independent of the RTC part. At the very least, you will be able to set the date/time and see it on LCD. Of course, since the RTC driver is not being called, the reading will not change automatically. You will be able to edit it via the editing routines.
Once you're sure that part works, you can concentrate your effort on the RTC driver and why all bytes are reading 165 (0xA5)
| Code: |
// LCD module connections
#define LCD_RS_PIN PIN_A2
#define LCD_RW_PIN PIN_A3
#define LCD_ENABLE_PIN PIN_A4
#define LCD_DATA4 PIN_A7
#define LCD_DATA5 PIN_A6
#define LCD_DATA6 PIN_B5
#define LCD_DATA7 PIN_B4
// end LCD module connections
// pin definitions
#define button1 PIN_B1
#define button2 PIN_B2
#define button3 PIN_B3
#define LED_PIN PIN_B6
#include <16F1847.h>
#fuses INTRC_IO ,NOMCLR,NOLVP,NOBROWNOUT,PUT,NOWDT
#use delay(internal = 8MHz)
#use I2C(MASTER, I2C1, SLOW = 100000, STREAM = DS3231_STREAM)
#use fast_io(b)
#use fast_io(a)
#include <lcd.c> // include LCD driver source file
#include <DS3231.c> // include DS3231 driver source file
int8 i;
// DS3231 library variable declaration
RTC_Time *mytime, *alarm1, *alarm2;
// external interrupt routine
#INT_EXT
void ext_isr(void)
{
output_high(LED_PIN);
clear_interrupt(INT_EXT);
}
// function for displaying day of the week
void dow_print()
{
lcd_gotoxy(1, 2);
switch(mytime->dow)
{
case SUNDAY : printf(lcd_putc, "Sun"); break;
case MONDAY : printf(lcd_putc, "Mon"); break;
case TUESDAY : printf(lcd_putc, "Tue"); break;
case WEDNESDAY: printf(lcd_putc, "Wed"); break;
case THURSDAY : printf(lcd_putc, "Thu"); break;
case FRIDAY : printf(lcd_putc, "Fri"); break;
default : printf(lcd_putc, "Sat");
}
}
// a small function for buttons debounce
int1 debounce(int16 button)
{
int8 count = 0;
for(int8 i = 0; i < 5; i++)
{
if ( !input(button) )
count++;
delay_ms(10);
}
if(count > 2) return 1;
else return 0;
}
void wait()
{
set_timer0(0);
while( (get_timer0() < 62500L) && (input(button1) || i >= 5) && input(button2) && (input(button3) || i < 5) ) ;
}
int8 edit(int8 x_pos, int8 y_pos, int8 parameter)
{
if(i < 5)
while( debounce(button1) ); // call debounce function (wait for B1 to be released)
else
while( debounce(button3) ); // call debounce function (wait for B3 to be released)
lcd_gotoxy(x_pos, y_pos); // move cursor to row y_pos, column x_pos
while(TRUE)
{
while(!input(button2))
{
parameter++;
if( (i == 0 || i == 5) && parameter > 23) // if hours > 23 ==> hours = 0
parameter = 0;
if( (i == 1 || i == 6) && parameter > 59) // if minutes > 59 ==> minutes = 0
parameter = 0;
if(i == 2 && parameter > 31) // if day > 31 ==> day = 1
parameter = 1;
if(i == 3 && parameter > 12) // if month > 12 ==> month = 1
parameter = 1;
if(i == 4 && parameter > 99) // if year > 99 ==> year = 0
parameter = 0;
printf(lcd_putc, "%02u\b\b", parameter);
delay_ms(200);
}
lcd_putc(" \b\b");
wait();
printf(lcd_putc, "%02u\b\b", parameter);
wait();
if( (!input(button1) && i < 5) || (!input(button3) && i >= 5) )
{
i++; // increment 'i' for the next parameter
return parameter; // return parameter value and exit
}
}
}
void alarms_edit(int8 _alarm)
{
int1 alarm_c;
if(_alarm == 1) {
lcd_gotoxy(38, 1);
alarm_c = Alarm1_Status();
}
else {
lcd_gotoxy(38, 2);
alarm_c = Alarm2_Status();
}
while( debounce(button3) ); // call debounce function (wait for B3 to be released)
while(TRUE)
{
while( !input(button2) )
{
alarm_c = !alarm_c;
if(alarm_c)
lcd_putc("ON \b\b\b");
else
lcd_putc("OFF\b\b\b");
delay_ms(500);
}
lcd_putc(" \b\b\b");
wait();
if(alarm_c) lcd_putc("ON \b\b\b");
else lcd_putc("OFF\b\b\b");
wait();
if( !input(button3) )
{
if(_alarm == 1)
{
if(alarm_c) Alarm1_Enable(); // enable alarm1
else Alarm1_Disable(); // disable alarm1
}
else
{
if(alarm_c) Alarm2_Enable(); // enable alarm2
else Alarm2_Disable(); // disable alarm2
}
return;
}
}
}
// main function
void main()
{
setup_oscillator(OSC_8MHZ); // set internal oscillator to 8MHz
set_tris_b(0x0F); // configure RB0~4 ins as inputs
port_b_pullups(0x0E); // enable RB1, RB2 & RB3 internal pull-ups
enable_interrupts(GLOBAL); // enable global interrupts
enable_interrupts(INT_EXT_H2L); // enable external interrupt (INT0) with edge from high to low
delay_ms(1000); // wait a second
lcd_init(); // initialize LCD module
IntSqw_Set(OUT_INT); // DS3231 INT/SQW pin configuration (interrupt when alarm)
Disable_32kHZ(); // disable DS3231 32kHz output
while(TRUE)
{
// read current time and date
//- mytime = RTC_Get();
// print time
lcd_gotoxy(1, 1);
printf(lcd_putc, "%02u:%02u:%02u", mytime->hours, mytime->minutes, mytime->seconds);
// print date
dow_print(); // print week day
lcd_gotoxy(5, 2);
printf(lcd_putc, "%02u/%02u/20%02u", mytime->day, mytime->month, mytime->year);
// read alarm1
//- alarm1 = Alarm1_Get();
// print alarm1
lcd_gotoxy(21, 1);
printf(lcd_putc, "A1: %02u:%02u:00", alarm1->hours, alarm1->minutes);
lcd_gotoxy(38, 1);
if( Alarm1_Status() )
lcd_putc("ON ");
else
lcd_putc("OFF");
// read alarm2
//- alarm2 = Alarm2_Get();
// print alarm2
lcd_gotoxy(21, 2);
printf(lcd_putc, "A2: %02u:%02u:00", alarm2->hours, alarm2->minutes);
lcd_gotoxy(38, 2);
if( Alarm2_Status() )
lcd_putc("ON ");
else
lcd_putc("OFF");
// read chip temperature
signed int16 chip_temp = Get_Temperature();
// print chip temperature
lcd_gotoxy(11, 1);
if (chip_temp < 0) // if temperature is negative
printf(lcd_putc, "T:-%02Lu.%02Lu%cC", abs(chip_temp) / 100, abs(chip_temp) % 100, 223);
else
printf(lcd_putc, "T: %02Lu.%02Lu%cC", chip_temp / 100, chip_temp % 100, 223);
// if button B1 is pressed
if( !input(button1) )
if( debounce(button1) ) // call debounce function (make sure if B1 is pressed)
{
i = 0;
setup_timer_0(T0_INTERNAL | T0_DIV_16); // start Timer0 with internal clock & prescaler=16
mytime->hours = edit(1, 1, mytime->hours); // edit hours
mytime->minutes = edit(4, 1, mytime->minutes); // edit minutes
mytime->seconds = 0; // reset seconds
while( debounce(button1) ); // call debounce function (wait for button B1 to be released)
while(TRUE)
{
while( !input(button2) ) // if button B2 button is pressed
{
mytime->dow++;
if(mytime->dow > 7) mytime->dow = 1;
dow_print(); // print week day
delay_ms(500);
}
lcd_gotoxy(1, 2);
lcd_putc(" "); // print 3 spaces
wait(); // call wait() function
dow_print(); // print week day
wait(); // call wait() function
if( !input(button1) ) // if button B1 is pressed
break;
}
mytime->day = edit(5, 2, mytime->day); // edit day
mytime->month = edit(8, 2, mytime->month); // edit month
mytime->year = edit(13, 2, mytime->year); // edit year
while( debounce(button1) ); // call debounce function (wait for button B1 to be released)
// disable Timer0
// write data to the RTC chip
//- RTC_Set(mytime);
}
// if button B3 is pressed
if( !input(button3) )
if( debounce(button3) ) // call debounce function (make sure if B3 is pressed)
{
i = 5;
setup_timer_0(T0_INTERNAL | T0_DIV_16); // start Timer0 with internal clock & prescaler=16
alarm1->hours = edit(25, 1, alarm1->hours); // edit alarm1 hours
alarm1->minutes = edit(28, 1, alarm1->minutes); // edit alarm1 minutes
alarm1->seconds = 0; // reset alarm1 seconds
Alarm1_Set(alarm1, HOURS_MINUTES_SECONDS_MATCH); // alarm when hours, minutes and seconds match
Alarm1_IF_Reset(); // reset alarm1 interrupt flag
alarms_edit(1); // edit alarm1 ON & OFF
i = 5;
alarm2->hours = edit(25, 2, alarm2->hours); // edit alarm2 hours
alarm2->minutes = edit(28, 2, alarm2->minutes); // edit alarm2 minutes
Alarm2_Set(alarm2, HOURS_MINUTES_MATCH); // alarm when hours and minutes match
Alarm2_IF_Reset(); // reset alarm2 interrupt flag
alarms_edit(2); // edit alarm2 ON & OFF
while( debounce(button3) ); // call debounce function (wait for button B3 to be released)
}
if( input(LED_PIN) && !input(button2) )
{
output_low(LED_PIN);
if( Alarm1_IF_Check() )
{
Alarm1_IF_Reset(); // reset alarm1 interrupt flag
Alarm1_Disable(); // disable alarm1
}
if( Alarm2_IF_Check() )
{
Alarm2_IF_Reset(); // reset alarm2 interrupt flag
Alarm2_Disable(); // disable alarm2
}
}
delay_ms(100);
}
}
// end of code. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Apr 13, 2021 1:02 am |
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Do a web search for:
Read all the hits and see if any of it might apply to your problem. |
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jake1272
Joined: 15 Mar 2021
Posts: 37
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| Posted: Tue Apr 13, 2021 1:58 am |
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| Hi Jerson, If I don't include I2C1 in #use I2C(MASTER, I2C1, SLOW = 100000, STREAM = DS3231_STREAM), I can edit date, time alarms. But with I2C1 included the LCD is blank. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19537
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| Posted: Tue Apr 13, 2021 2:48 am |
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Er. On the 16F1847, the default pin location for I2C1, is pins B1 & B4,
which clashes with the button locations shown....
You are going to have to switch to using software I2C, or move some of
the other peripherals around.... 
Not surprised it doesn't work... |
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jake1272
Joined: 15 Mar 2021
Posts: 37
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| Posted: Tue Apr 13, 2021 3:55 am |
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| PCM programmer wrote: | Do a web search for:
Read all the hits and see if any of it might apply to your problem. |
Thanks, PCM programmer here is what I have found:
The I2C interface is accessible whenever either VCC or VBAT is at a valid level. If a microcontroller connected to the DS3231 resets because of a loss of VCC or other event, it is possible that the microcontroller and DS3231 I2C communications could become unsynchronized, e.g., the microcontroller resets while reading data from the DS3231. When the microcontroller resets, the DS3231 I2C interface may be placed into a known state by toggling SCL until SDA is observed to be at a high level. At that point the microcontroller should pull SDA low while SCL is high, generating a START condition.
Some people claimed (Adruino forum) there might be a problem with the battery |
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jake1272
Joined: 15 Mar 2021
Posts: 37
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| Posted: Tue Apr 13, 2021 4:00 am |
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| Ttelmah wrote: | Er. On the 16F1847, the default pin location for I2C1 is pins B1 & B4,
which clashes with the button locations shown...
You are going to have to switch to using software I2C or move some of
the other peripherals around....
Not surprised it doesn't work... |
I switch the pins, waiting for the magic to be operated but nothing happened
| Code: | #define LCD_RS_PIN PIN_A2
#define LCD_RW_PIN PIN_A3
#define LCD_ENABLE_PIN PIN_A4
#define LCD_DATA4 PIN_A7
#define LCD_DATA5 PIN_A6
#define LCD_DATA6 PIN_A0
#define LCD_DATA7 PIN_A1
// end LCD module connections
// pin definitions
#define button1 PIN_B5
#define button2 PIN_B2
#define button3 PIN_B3
#define LED_PIN PIN_A5
#include <16F1847.h>
#fuses INTRC_IO ,NOMCLR,NOLVP,NOBROWNOUT,PUT,NOWDT
#use delay(internal = 8MHz)
#use I2C(MASTER,I2C1, SLOW = 100000, STREAM = DS3231_STREAM)
#include <lcd.c> // include LCD driver source file
#include <DS3231.c> // include DS3231 driver source file
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Last edited by jake1272 on Tue Apr 13, 2021 4:00 am; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19537
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| Posted: Tue Apr 13, 2021 4:00 am |
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That is the standard I2C 're-init' sequence.
Basically use the 'no init' option in #USE I2C.
Then at the start simply toggle the SCL line, till you see the data line is high.
Once this is done, init the I2C interface. |
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Jerson
Joined: 31 Jul 2009
Posts: 125
Location: Bombay, India
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| Posted: Tue Apr 13, 2021 4:26 am |
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| jake1272 wrote: | | Hi Jerson, If I don't include I2C1 in #use I2C(MASTER, I2C1, SLOW = 100000, STREAM = DS3231_STREAM), I can edit date, time alarms. But with I2C1 included the LCD is blank |
This indicates you're having trouble with the I2C communications with RTC |
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temtronic
Joined: 01 Jul 2010
Posts: 9241
Location: Greensville,Ontario
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| Posted: Tue Apr 13, 2021 4:59 am |
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FWIW...
I posted my 'basic DS3231 driver' code in the code library. While it doesn't do 'alarms', I know it works,at least on the 18F46k22, 26k22 devices. I modified DS1307 code( device address, some register settings).
It's my RTC for all projects as the 'RTC module' I buy also have a 24lc32 EEProm on it and for $2 I can't resist buying them.
If it works for you, then you know the current driver has a 'bug' in it somewhere.....
Jay |
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