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PIC18F46J11 and RTC functionality

 
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noxus



Joined: 16 Nov 2009
Posts: 6

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PIC18F46J11 and RTC functionality
PostPosted: Tue Nov 24, 2009 9:44 am     Reply with quote
Hello all,
I'm trying to get the RTC (clock & alarm) to work with my PIC18F46J11.
I want the microcontroller to execute some code when an RTC interrupt occurs. Eventually I am going to set the alarm time via a serial interface but for now I've hard coded the begin time and alarm time.
Note: I've attached a second external crystal oscillator for the RTC of the PIC microcontroller. I'm using the following code. (compiler is version 4.099)
Code:
#include <18F46J11.h>

#FUSES NOWDT
#FUSES INTRC_IO
#FUSES NOPROTECT
#FUSES RTCOSC_T1   

#use delay(clock=8000000)

#int_RTC
void RTC_isr(void)
{
   output_toggle(PIN_D2);
}

void main()
{
   time_t tWriteTime;
   time_t tAlarmTime;

   tWriteTime.tm_year = 9;
   tWriteTime.tm_mon  = 11;
   tWriteTime.tm_mday = 24;
   tWriteTime.tm_wday = 2;
   tWriteTime.tm_hour = 16;
   tWriteTime.tm_min  = 0;
   tWriteTime.tm_sec  = 0;

   tAlarmTime.tm_year = 9;
   tAlarmTime.tm_mon  = 11;
   tAlarmTime.tm_mday = 24;
   tAlarmTime.tm_wday = 2;
   tAlarmTime.tm_hour = 16;
   tAlarmTime.tm_min  = 0;
   tAlarmTime.tm_sec  = 5;

   setup_rtc(RTC_ENABLE | RTC_OUTPUT_SECONDS, 0x00);
   setup_rtc_alarm(RTC_ALARM_ENABLE,RTC_ALARM_SEC, 0xff);
   rtc_write(&tWriteTime);
   rtc_alarm_write(&tAlarmTime);
   
   enable_interrupts(int_rtc);

   while(1)
   {
   }
}


Via breakpoints and some extra debugging code I noticed that the RTC was indeed incrementing. But I'm not sure that I'm using the correct procedure to set the ALARM functionality. Also, I didn't find anything in the help file regarding the #INT_RTC interrupt routine.

At the moment it looks like the RTC interrupt never occurs when the RTC reaches the alarm time.

Did I set up the microcontroller correctly to generate an interrupt when the alarm time occurs?
I'm not sure since I couldn't find a good example or good documentation regarding this functionality.

Thanks in advance for all the help!
Ttelmah
Guest
PostPosted: Tue Nov 24, 2009 9:54 am     Reply with quote
enable_interrupts(INT_GLOBAL);

There are _two_ bits that must be set before an interrupt is responded to. It's own interrupt enable,and the _global_ interrupt enable....

Best Wishes
noxus



Joined: 16 Nov 2009
Posts: 6

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PostPosted: Tue Nov 24, 2009 10:02 am     Reply with quote
Thanks Ttelmah!
I cannot believe I forgot the enable the global interrupts.
Thanks a million!
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