/// <summary>
/// Set one of the two alarms on the DS323x module.
/// </summary>
/// <param name="alarm">Define the alarm to be set.</param>
/// <param name="time">Date and time for the alarm.</param>
/// <param name="type">Type of alarm to set.</param>
public void SetAlarm(Alarm alarm, DateTime time, AlarmType type)
{
byte[] data = null;
var register = Registers.Alarm1Seconds;
var element = 0;
if (alarm == Alarm.Alarm1Raised)
{
data = new byte[5];
element = 1;
data[0] = Converters.ByteToBCD((byte)(time.Second & 0xff));
}
else
{
data = new byte[4];
register = Registers.Alarm2Minutes;
}
data[element++] = Converters.ByteToBCD((byte)(time.Minute & 0xff));
data[element++] = Converters.ByteToBCD((byte)(time.Hour & 0xff));
if ((type == AlarmType.WhenDayHoursMinutesMatch) || (type == AlarmType.WhenDayHoursMinutesSecondsMatch))
{
data[element] = (byte)(DayOfWeekToByte(time.DayOfWeek) | 0x40);
}
else
{
data[element] = Converters.ByteToBCD((byte)(time.Day & 0xff));
}
switch (type)
{
//
// Alarm 1 interrupts.
//
case AlarmType.OncePerSecond:
data[0] |= 0x80;
data[1] |= 0x80;
data[2] |= 0x80;
data[3] |= 0x80;
break;
case AlarmType.WhenSecondsMatch:
data[1] |= 0x80;
data[2] |= 0x80;
data[3] |= 0x80;
break;
case AlarmType.WhenMinutesSecondsMatch:
data[2] |= 0x80;
data[3] |= 0x80;
break;
case AlarmType.WhenHoursMinutesSecondsMatch:
data[3] |= 0x80;
break;
case AlarmType.WhenDateHoursMinutesSecondsMatch:
break;
case AlarmType.WhenDayHoursMinutesSecondsMatch:
data[3] |= 0x40;
break;
//
// Alarm 2 interupts.
//
case AlarmType.OncePerMinute:
data[0] |= 0x80;
data[1] |= 0x80;
data[2] |= 0x80;
break;
case AlarmType.WhenMinutesMatch:
data[1] |= 0x80;
data[2] |= 0x80;
break;
case AlarmType.WhenHoursMinutesMatch:
data[2] |= 0x80;
break;
case AlarmType.WhenDateHoursMinutesMatch:
break;
case AlarmType.WhenDayHoursMinutesMatch:
data[2] |= 0x40;
break;
}
_ds323x.WriteRegisters(register, data);
//
// Turn the relevant alarm on.
//
var controlRegister = ControlRegister;
var bits = (byte)ControlRegisterBits.A1IE;
if (alarm == Alarm.Alarm2Raised)
{
bits = (byte)ControlRegisterBits.A2IE;
}
controlRegister |= (byte)ControlRegisterBits.INTCON;
controlRegister |= bits;
ControlRegister = controlRegister;
}
public void UpdateDisplay()
{
_I2CBus.WriteRegisters(0x0, displayBuffer);
}
