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aaronik19
Joined: 25 Apr 2011
Posts: 297
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| DS1307 interface |
 Posted: Sat Apr 04, 2015 3:13 pm |
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Dear all,
I am trying to work with my RTC DS1307 module and it does not work. The main program is this:
| Code: | #include <program.h>
#define LCD_RS_PIN PIN_A3
#define LCD_RW_PIN PIN_A2
#define LCD_ENABLE_PIN PIN_A1
#define LCD_DATA4 PIN_D4
#define LCD_DATA5 PIN_D5
#define LCD_DATA6 PIN_D6
#define LCD_DATA7 PIN_D7
#include <lcd.c>
#include <ds1307.C>
int count1 = 0;
//timeclock variables
BYTE sec;
BYTE min;
BYTE hrs;
BYTE day;
BYTE month;
BYTE yr;
BYTE dow;
#INT_EXT
void EXT_isr(void)
{
if (PIN_A4)
{
output_toggle(PIN_E2);
}
}
void main()
{
lcd_init();
lcd_putc("\fReady...\n");
enable_interrupts(INT_EXT);
ds1307_init();
delay_ms(1000);
ds1307_set_date_time(15,6,5,2,15,20,55);
enable_interrupts(GLOBAL);
printf("done");
while(TRUE)
{
delay_ms(1000);
ds1307_get_date(day,month,yr,dow);
ds1307_get_time(hrs,min,sec);
printf( "\f\%02d/\%02d/\%02d\r\n",day,month,yr);
printf( "\%02d:\%02d:\%02d", hrs,min,sec);
}
} |
and the driver is:
| Code: | ////////////////////////////////////////////////////////////////////////////////
/// DS1307.C ///
/// Driver for Real Time Clock ///
/// ///
/// ds1307_init() - Enable oscillator without clearing the seconds register -///
/// used when PIC loses power and DS1307 run from 3V BAT ///
/// - Disable squarewave output ///
/// ///
/// ds1307_set_date_time(day,mth,year,dow,hour,min,sec) Set the date/time ///
/// ///
/// ds1307_get_date(day,mth,year,dow) Get the date ///
/// ///
/// ds1307_get_time(hr,min,sec) Get the time ///
/// ///
////////////////////////////////////////////////////////////////////////////////
#define RTC_SDA PIN_D7
#define RTC_SCL PIN_D6
#use i2c(master, sda=RTC_SDA, scl=RTC_SCL)
BYTE bin2bcd(BYTE binary_value);
BYTE bcd2bin(BYTE bcd_value);
void ds1307_init(void)
{
BYTE seconds = 0;
i2c_start();
i2c_write(0xD0); // WR to RTC
i2c_write(0x00); // REG 0
i2c_start();
i2c_write(0xD1); // RD from RTC
seconds = bcd2bin(i2c_read(0)); // Read current "seconds" in DS1307
i2c_stop();
seconds &= 0x7F;
delay_us(3);
i2c_start();
i2c_write(0xD0); // WR to RTC
i2c_write(0x00); // REG 0
i2c_write(bin2bcd(seconds)); // Start oscillator with current "seconds value
i2c_start();
i2c_write(0xD0); // WR to RTC
i2c_write(0x07); // Control Register
i2c_write(0x80); // Disable squarewave output pin
i2c_stop();
}
void ds1307_set_date_time(BYTE day, BYTE mth, BYTE year, BYTE dow, BYTE hr, BYTE min, BYTE sec)
{
sec &= 0x7F;
hr &= 0x3F;
i2c_start();
i2c_write(0xD0); // I2C write address
i2c_write(0x00); // Start at REG 0 - Seconds
i2c_write(bin2bcd(sec)); // REG 0
i2c_write(bin2bcd(min)); // REG 1
i2c_write(bin2bcd(hr)); // REG 2
i2c_write(bin2bcd(dow)); // REG 3
i2c_write(bin2bcd(day)); // REG 4
i2c_write(bin2bcd(mth)); // REG 5
i2c_write(bin2bcd(year)); // REG 6
i2c_write(0x80); // REG 7 - Disable squarewave output pin
i2c_stop();
}
void ds1307_get_date(BYTE &day, BYTE &mth, BYTE &year, BYTE &dow)
{
i2c_start();
i2c_write(0xD0);
i2c_write(0x03); // Start at REG 3 - Day of week
i2c_start();
i2c_write(0xD1);
dow = bcd2bin(i2c_read() & 0x7f); // REG 3
day = bcd2bin(i2c_read() & 0x3f); // REG 4
mth = bcd2bin(i2c_read() & 0x1f); // REG 5
year = bcd2bin(i2c_read(0)); // REG 6
i2c_stop();
}
void ds1307_get_time(BYTE &hr, BYTE &min, BYTE &sec)
{
i2c_start();
i2c_write(0xD0);
i2c_write(0x00); // Start at REG 0 - Seconds
i2c_start();
i2c_write(0xD1);
sec = bcd2bin(i2c_read() & 0x7f);
min = bcd2bin(i2c_read() & 0x7f);
hr = bcd2bin(i2c_read(0) & 0x3f);
i2c_stop();
}
BYTE bin2bcd(BYTE binary_value)
{
BYTE temp;
BYTE retval;
temp = binary_value;
retval = 0;
while(1)
{
// Get the tens digit by doing multiple subtraction
// of 10 from the binary value.
if(temp >= 10)
{
temp -= 10;
retval += 0x10;
}
else // Get the ones digit by adding the remainder.
{
retval += temp;
break;
}
}
return(retval);
}
// Input range - 00 to 99.
BYTE bcd2bin(BYTE bcd_value)
{
BYTE temp;
temp = bcd_value;
// Shifting upper digit right by 1 is same as multiplying by 8.
temp >>= 1;
// Isolate the bits for the upper digit.
temp &= 0x78;
// Now return: (Tens * 8) + (Tens * 2) + Ones
return(temp + (temp >> 2) + (bcd_value & 0x0f));
} |
now since I already have the MAX517 on pins C4 and C3 (hardware I2C) I used a software I2C for the RTC as can be seen on the RTC driver. But the LCD remains "Ready..." and on the hyperterminal nothing is being displayed. The module I am using is shown here:
http://www.instructables.com/id/Arduino-Shower-Monitor-2/
the module has built in 3k3 on I2C bus that's why I used a seperate i2c ports. |
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huynhhai
Joined: 04 Apr 2015
Posts: 39
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| Posted: Sat Apr 04, 2015 9:06 pm |
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You should use direct code to display lcd & read RTC no using interrupt & do it step by step, display any your info on lcd ok, then read RTC to display LCD, don't forgot enable internal oscillate of RTC, can you check it
Regards, |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Apr 04, 2015 10:17 pm |
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| Quote: | #define LCD_RS_PIN PIN_A3
#define LCD_RW_PIN PIN_A2
#define LCD_ENABLE_PIN PIN_A1
#define LCD_DATA4 PIN_D4
#define LCD_DATA5 PIN_D5
#define LCD_DATA6 PIN_D6
#define LCD_DATA7 PIN_D7
#define RTC_SDA PIN_D7
#define RTC_SCL PIN_D6 |
You are using the same pins for the LCD and the ds1307.
Don't do that. |
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aaronik19
Joined: 25 Apr 2011
Posts: 297
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| Posted: Sun Apr 05, 2015 2:19 am |
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| Dear all, thanks for your replies. Actually i removed all the enable_interrupts including the global one and it worked perfectly even on the same max517 i2c bus line C3 and C4 pins. What could be the problem? |
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huynhhai
Joined: 04 Apr 2015
Posts: 39
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| Posted: Sun Apr 05, 2015 11:58 am |
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| Maybe, your code at the programs interrupt no ok, therefore programs can not return to main programs ==> can not read RTC to display LCD |
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aaronik19
Joined: 25 Apr 2011
Posts: 297
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| Posted: Sun Apr 05, 2015 12:06 pm |
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| Is there any pattern or sequence where i should list the enable interrupts e.g. at the beginning of the main routine or after the initialization of the drivers? Or it does not make any difference? |
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huynhhai
Joined: 04 Apr 2015
Posts: 39
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| Posted: Sun Apr 05, 2015 1:17 pm |
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try to put this code look like below
| Code: |
#include <program.h>
#include <lcd.c>
#include <ds1307.C>
#INT_EXT
void EXT_isr(void)
{
if (PIN_A4)
{
output_toggle(PIN_E2);
}
} |
you put interrupt code wrong position maybe interrupt no active, check it again |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Apr 05, 2015 1:29 pm |
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This won't work:
To read a pin, you must use the input() function. Example:
| Code: |
if(input(PIN_A4))
{
output_toggle(PIN_E2);
}
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aaronik19
Joined: 25 Apr 2011
Posts: 297
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| Posted: Mon Apr 06, 2015 12:50 am |
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| Ooops...yes you are right! I will update the code and try again. |
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aaronik19
Joined: 25 Apr 2011
Posts: 297
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| Posted: Mon Apr 06, 2015 3:16 am |
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Dear All,
continue to working on the "strange" situation that I have on my code regaring the #INT statements! This is the code.
| Code: | #include <program.h>
#include <MAX517.C>
#include <ds1307.C>
#define LCD_RS_PIN PIN_A3
#define LCD_RW_PIN PIN_A2
#define LCD_ENABLE_PIN PIN_A1
#define LCD_DATA4 PIN_D4
#define LCD_DATA5 PIN_D5
#define LCD_DATA6 PIN_D6
#define LCD_DATA7 PIN_D7
#include <lcd.c>
//timeclock variables
BYTE sec;
BYTE min;
BYTE hrs;
BYTE day;
BYTE month;
BYTE yr;
BYTE dow;
void main()
{
setup_timer_1(T1_INTERNAL|T1_DIV_BY_8); //104 ms overflow
enable_interrupts(INT_TIMER1);
enable_interrupts(INT_RDA);
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
ds1307_init();
delay_ms(400);
lcd_init();
delay_ms(400);
while(true)
{
ds1307_get_date(day,month,yr,dow);
ds1307_get_time(hrs,min,sec);
lcd_gotoxy(0,0);
printf(lcd_putc, "Date: \%02d/\%02d/\%02d\r\n",day,month,yr);
lcd_gotoxy(0,1);
printf(lcd_putc, "Time: \%02d:\%02d:\%02d", hrs,min,sec);
}
} |
This code is working 100% but when I insert the following code just after the timeclock variables the program hangs:
| Code: | #INT_TIMER1
void TIMER1_isr(void)
{
}
#INT_EXT
void EXT_isr(void)
{
}
#INT_RDA
void RDA_isr(void)
{
}
#INT_TBE
void TBE_isr(void)
{
}
|
I tried to put one statement at a time, and also change the place where i put this code, but it was in vain. Sorry but I need to use all the interrupts that's why I put them all. |
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aaronik19
Joined: 25 Apr 2011
Posts: 297
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| Posted: Mon Apr 06, 2015 3:18 am |
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| sorry forgot to mention, I am using PIC18F4520 with crystal 20MHz |
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alan
Joined: 12 Nov 2012
Posts: 357
Location: South Africa
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| Posted: Mon Apr 06, 2015 3:44 am |
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Maybe there is a char in the RX reg and it keeps on firing the INT_RDA, try reading the RX reg and try.
When you tried adding them one at a time you did disable the interrupts that
didn't had any handler.
Just suggestions.
Regards |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19549
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| Posted: Mon Apr 06, 2015 4:21 am |
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Of course it would.....
Alan has given the first potential part. An INT_RDA handler _must_ always read a character, or the code will hang forever if this triggers. However even if this doesn't trigger there is a second problem.
The second part is INT_TBE. This _must_ only be enabled, when you have characters to send. Look at how ex_stisr works. The interrupt is disabled in the handler, once the last character is sent. INT_TBE says 'I want a character to transmit'. Unless you transmit one, the interrupt _will_ trigger again instantly.
You can never enable INT_TBE, until you have data waiting to send. The handler needs to either load a character, or disable the interrupt, or it can never exit. |
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huynhhai
Joined: 04 Apr 2015
Posts: 39
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| Posted: Tue Apr 07, 2015 12:54 am |
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| Are you forgot setup for priority interrupt? test one interrupt actived |
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aaronik19
Joined: 25 Apr 2011
Posts: 297
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| Posted: Tue Apr 07, 2015 1:08 am |
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| thanks for everyone. Now everything is sorted regarding this issue. |
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