problem in RTC ALARM

[tariq]

hi everyone

I'm usig stm32f103 and code below to set rtc alarm every one hour

RTC_Alarm_Time.Alarm = 1;

RTC_Alarm_Time.AlarmTime.Hours=RTC_Time.Hours+1;
 if (RTC_Alarm_Time.AlarmTime.Hours>23)
{
 RTC_Alarm_Time.AlarmTime.Hours=0;
 }
 RTC_Alarm_Time.AlarmTime.Hours=RTC_Time.Hours;
RTC_Alarm_Time.AlarmTime.Minutes=RTC_Time.Minutes;
RTC_Alarm_Time.AlarmTime.Seconds=RTC_Time.Seconds;
HAL_RTC_SetAlarm_IT(&hrtc, &RTC_Alarm_Time, RTC_FORMAT_BIN);

my problem is that alarm skips hour zero and after hour 23 it goes to hour 1. 

I don't know maybe because when i set alarm hour to 0 RTC date is still previous day.I'm using stm32f103 so in my library i can't define alarm Mask that ignores date in alarms.


appreciate your help.

[SiliconWizard]

A quick look at your code seems to show there is basic programming problem.

If you don't have a debugger at disposal, try to execute "by hand" your code on paper (it's small so it'll be simple and fast to do.)
You'll see what your problems are.

I can see at least two. But the most obvious one is that you first increment 'TC_Alarm_Time.AlarmTime.Hours' (and wrap it around for 24 hours), but then you set it 'RTC_Time.Hours' (which I assume is the current time?), so your incremented value is just lost.

Code: [Select]

RTC_Alarm_Time.AlarmTime.Hours=RTC_Time.Hours;