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haseeb
Joined: 27 Apr 2011
Posts: 19
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| RTCC alarm problem with PIC18F67k22 |
 Posted: Mon Apr 02, 2012 4:47 am |
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Hello
I'm using PIC18F67K22 with internal OSC 4MHz and CCS compiler ver
4.130. I have the RTCC clock selection used with (SOSC0 & SOSC1)
via crystal 32.768kHz.
I have a simple test program where I set the alarm for 10secs
and then wait to see if my LED will flash after 10secs. The process
then repeats itself as per my program.
However, I can not achieve this since my LED is not flashing
at will with the RTCC alarm. On its own, the LED does flash and i can
even set the flashing rate to any rate that i desire.
Please can someone help and suggest where i'm wrong in my code
below and how to achieve RTCC alarm.
Thanks
Haseeb
| Code: |
#include <18F67K22.h>
#fuses INTRC_IO, NOWDT, NOBROWNOUT, MCLR
// Set Speed to 4Mhz
#use delay(clock=4000000)
#include <stdio.h>
int alarm_flag = 0;
#int_RTC
void RTC_isr(void)
{
alarm_flag = 1; //raise flag once 10secs lapse
}
void main(void)
{
delay_ms(500); //startup delay
enable_interrupts(INT_RTC); //enable RTC interrupts
setup_rtc(RTC_ENABLE); //enable RTC
while(true) //loop forever
{
setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_10_SECONDS, 0x08); //initiallize 10 sec alarm
while(alarm_flag == 0); //stay here until 10sec alarm
alarm_flag = 0; //reset flag
//flash to indicate 10sec alarm
output_high(pin_B4);
delay_ms(200);
output_low(pin_B4);
delay_ms(200);
output_high(pin_B4);
delay_ms(200);
output_low(pin_B4);
delay_ms(200);
}
}
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jeremiah
Joined: 20 Jul 2010
Posts: 1346
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| Posted: Mon Apr 02, 2012 5:00 am |
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Try changing
| Code: |
enable_interrupts(INT_RTC); //enable RTC interrupts
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| Code: |
enable_interrupts(INT_RTC); //enable RTC interrupts
enable_interrupts(GLOBAL); //enable interrupts
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If it gives a compiler error, look in the .h file for which "global" define is correct. |
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haseeb
Joined: 27 Apr 2011
Posts: 19
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| Posted: Mon Apr 02, 2012 5:11 am |
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Hi
I have just done that and enabled GLOBAL interrupts as well.
Compiler gives NO error. But still my LED will not flash via
alarm....
please help...
Haseeb |
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haseeb
Joined: 27 Apr 2011
Posts: 19
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| Posted: Mon Apr 02, 2012 5:57 am |
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hello
anybody got any ideas regarding my alarm problem
haseeb |
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dyeatman
Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK
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| Posted: Mon Apr 02, 2012 6:25 am |
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Haseeb, this is a user forum, not CCS, so everyone may not be looking at
the forum right now. It may take a while before someone with the specific
knowledge you need gets a chance to check in. You have to be patient. If
you let your project get down to the deadline that is your problem...not one
that we caused.
_________________
Google and Forum Search are some of your best tools!!!! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19506
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| Posted: Mon Apr 02, 2012 8:41 am |
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I don't see you enabling the secondary oscillator. This is needed for the RTC to run. SOSC_LOW, and RTCOSC_T1 in the fuses, and setup_timer_1(T1_ENABLE_SOSC); in the code
I think it is probably defaulting to T1, but this is not enabled, so it doesn't run.
The T1 setting controls whether the secondary oscillator runs or not.
Best Wishes |
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haseeb
Joined: 27 Apr 2011
Posts: 19
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| Posted: Tue Apr 03, 2012 9:05 am |
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Hi
I have just tried your suggestion and still the RTC is not working.
No interrupt occur and my LED does not flash.
please help!
haseeb |
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jeremiah
Joined: 20 Jul 2010
Posts: 1346
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| Posted: Tue Apr 03, 2012 10:23 am |
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| Post your updated code (or just update the code in your first post and let us know), so we can see that changes got in there as it was suggested. |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Tue Apr 03, 2012 12:38 pm |
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| Code: | | while(alarm_flag == 0); //stay here until 10sec alarm |
Syntax...
take the Semi colon out, and add brackets.
| Code: | | while(alarm_flag == 0){} //stay here until 10sec alarm |
G.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19506
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| Posted: Tue Apr 03, 2012 2:44 pm |
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| Gabriel wrote: | | Code: | | while(alarm_flag == 0); //stay here until 10sec alarm |
Syntax...
take the Semi colon out, and add brackets.
| Code: | | while(alarm_flag == 0){} //stay here until 10sec alarm |
G. |
This is not needed.
In C, an 'if', executes the single code block after the command.
A line terminated with ';' is a code block, as are multiple lines contained in '{}' braces.
The original is syntactically perfectly OK.
Best Wishes |
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haseeb
Joined: 27 Apr 2011
Posts: 19
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| Posted: Wed Apr 04, 2012 7:04 am |
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ok thanks guys for your suggestions....
i will post the new updated code....now
haseeb |
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haseeb
Joined: 27 Apr 2011
Posts: 19
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| Posted: Thu Apr 19, 2012 3:16 am |
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Hello people
I have tried all that you have suggested and i have even tried out
the RTCC example program as below and it compiles and the output
is as below....HOWEVER....the clock does not seem to tick at all as the
seconds do not increment.
I have disabled the alarm and now its only the clock that i want to
get up and running.
Please can someone help....
Haseeb
| Code: |
OUTPUT on HyperTerminal as below....
Press ENTER after 1 digit answers.
Year 20: 12
Month: 04
Day: 19
Weekday 1-7: 05
Hour: 10
Min: 09
04/19/2012 10:09:00
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| Code: |
//Internal RTCC....
#include <18F67K22.h>
#FUSES NOWDT
#FUSES INTRC_IO
#FUSES NOPROTECT
#FUSES RTCOSC_T1
#FUSES SOSC_LOW
#FUSES MCLR
// Set Speed to 4Mhz
#use delay(clock=4000000)
// RS232 to PC
#use rs232(baud=9600, UART1, STREAM=User)
#include <stdio.h>
int8 get_number()
{
char first,second;
do {
first=fgetc(User);
} while ((first<'0') || (first>'9'));
fputc(first,User);
first-='0';
do {
second=fgetc(User);
} while (((second<'0') || (second>'9')) && (second!='\r'));
fputc(second,User);
if(second=='\r')
return(first);
else
return((first*10)+(second-'0'));
}
void set_clock(rtc_time_t &date_time)
{
fprintf(User, "\r\nPress ENTER after 1 digit answers.");
fprintf(User, "\r\nYear 20: ");
date_time.tm_year=get_number();
fprintf(User, "\r\nMonth: ");
date_time.tm_mon=get_number();
fprintf(User, "\r\nDay: ");
date_time.tm_mday=get_number();
fprintf(User, "\r\nWeekday 1-7: ");
date_time.tm_wday=get_number();
fprintf(User, "\r\nHour: ");
date_time.tm_hour=get_number();
fprintf(User, "\r\nMin: ");
date_time.tm_min=get_number();
date_time.tm_sec=0;
printf("\r\n\n");
}
void main(void)
{
//Initiallize All I/O Pins....
//PORTA
output_low(pin_A2);
output_low(pin_A3);
output_low(pin_A4);
output_low(pin_A5);
output_low(pin_A6);
output_low(pin_A7);
//PORTB
output_low(pin_B1);
output_low(pin_B2);
output_low(pin_B3);
output_low(pin_B5);
//PORTC
output_low(pin_C2);
output_high(pin_C5);
//PORTD
output_d(0);
//PORTE
output_e(0);
//PORTF
output_low(pin_F1);
output_low(pin_F2);
output_low(pin_F3);
output_low(pin_F4);
output_low(pin_F5);
output_low(pin_F6);
output_low(pin_F7);
//PORTG
output_low(pin_G0);
output_low(pin_G3);
output_low(pin_G4);
disable_interrupts(GLOBAL);
delay_ms(100); //startup delay
setup_timer_1(T1_ENABLE_SOSC);
rtc_time_t write_clock, read_clock;
setup_rtc(RTC_ENABLE,0); //enables internal RTCC
set_clock(write_clock);
rtc_write(&write_clock); //writes new clock setting to RTCC
while(true)
{
rtc_read(&read_clock); //reads clock value from RTCC
fprintf(User, "\r%02u/%02u/20%02u %02u:%02u:%02u",
read_clock.tm_mon,
read_clock.tm_mday,
read_clock.tm_year,
read_clock.tm_hour,
read_clock.tm_min,
read_clock.tm_sec);
delay_ms(250);
}
}
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haseeb
Joined: 27 Apr 2011
Posts: 19
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| Posted: Fri Apr 20, 2012 6:25 am |
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Hello People...
I have finally been able to get both the clock ticking and the alarm interrupts working as well. A change of crystal solved the problem.
However I can only get alarm interrupts for half second and one second only.
Please can you let me know why I cannot get higher delays with my alarm interrupts. Ideally I want this to be for 1 hour alarm setting.
But I tried to progress to that stage and found I could only do up to 1second complete.
Below is how I set the alarm configurations as per the PIC header file…
| Code: |
//setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_HALFSECOND, 0); //WORKS
//setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_SECOND, 0); //WORKS
//setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_10_SECONDS, 0); //DOES NOT WORK!!
setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_10_MINUTES, 0); //DOES NOT WORK!!
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This clearly reflects a software issue.
Please can you look at my program below and kindly suggest.
Thanks
haseeb
| Code: |
#include <18F67K22.h>
#FUSES INTRC_IO, NOWDT, SOSC_LOW, NOBROWNOUT, MCLR
#device ADC = 12
// Set Speed to 4Mhz
#use delay(clock=4000000)
// RS232 to Modem
#use rs232(baud=9600, UART2, STREAM=Modem)
// RS232 to PC
#use rs232(baud=9600, UART1, STREAM=User)
#define Boost_Converter pin_B5
#define LED pin_B4
#define Emerg_RST_Modem pin_C2
#define V285_Pin pin_C3
#define V180_Pin pin_C4
#define Modem_ON pin_C5
#include <stdio.h>
char clock_sleeping = 1; //flag to tell us that we have woken up from ...
// ... sleeping when the alarm INT (0 = wakeup / 1 = sleep)
#int_RTC
void RTC_isr(void)
{
//we have woken up from sleep
clock_sleeping = 0;
}
//RTCC function
void set_clock(rtc_time_t &date_time)
{
//reseting the clock...
date_time.tm_year=12; //2012
date_time.tm_mon=4; //April
date_time.tm_mday=20; //20th
date_time.tm_wday=6; //Friday
date_time.tm_hour=13; //13hrs
date_time.tm_min=8; //8min
date_time.tm_sec=0; //0secs
}
void main(void)
{
//Initiallize All I/O Pins....
//PORTA
output_low(pin_A2);
output_low(pin_A3);
output_low(pin_A4);
output_low(pin_A5);
output_low(pin_A6);
output_low(pin_A7);
//PORTB
output_low(pin_B1);
output_low(pin_B2);
output_low(pin_B3);
output_high(pin_B5);
//PORTC
output_low(pin_C2);
output_high(pin_C5);
//PORTD
output_d(0);
//PORTE
output_e(0);
//PORTF
output_low(pin_F1);
output_low(pin_F2);
output_low(pin_F3);
output_low(pin_F4);
output_low(pin_F5);
output_low(pin_F6);
output_low(pin_F7);
//PORTG
output_low(pin_G0);
output_low(pin_G3);
output_low(pin_G4);
enable_interrupts(INT_RTC); //enable RTC interrupts
enable_interrupts(GLOBAL); //enable interrupts
delay_ms(100); //startup delay
//Clock Initiation Commands...
rtc_time_t write_clock, read_clock;
setup_rtc(RTC_ENABLE,0); //enables internal RTCC
set_clock(write_clock);
rtc_write(&write_clock); //writes new clock setting to RTCC
//Print initial clock settings....
rtc_read(&read_clock); //reads clock value from RTCC
fprintf(User, "\n\r\n\r %02u:%02u:%02u", read_clock.tm_hour, read_clock.tm_min, read_clock.tm_sec);
while(TRUE)
{
//Before going to SLEEP .... set the Alarm!!!
//setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_HALFSECOND, 0); //WORKS
//setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_SECOND, 0); //WORKS
//setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_10_SECONDS, 0); //DOES NOT WORK!!
setup_rtc_alarm(RTC_ALARM_ENABLE, RTC_ALARM_10_MINUTES, 0); //DOES NOT WORK!!
sleep(); //now goto sleep...
delay_ms(100); //When waking up, delay needed to bring the PIC up to working state
if(clock_sleeping == 0) //did we wake up from clock INT?
{
rtc_read(&read_clock); //reads clock value from RTCC
fprintf(User, "\n\r\n\r %02u:%02u:%02u", read_clock.tm_hour, read_clock.tm_min, read_clock.tm_sec);
clock_sleeping = 1; //set sleep flag to indicate that we are about to goto sleep again...
delay_ms(100); //before we go back and set alarm...put delay as PIC likes it!
}
}
}
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