Add alarm 1 and 2 examples

examples/linux.rs

@@ -21,5 +21,6 @@ fn main() {
     // do something else...
     let seconds = rtc.get_seconds().unwrap();
     println!("Seconds: {}", seconds);
+
     let _dev = rtc.destroy_ds3231();
 }

examples/linux_alarm1.rs

@@ -0,0 +1,18 @@
+//! Set the Alarm1 to each week on a week day at a specific time
+extern crate linux_embedded_hal as hal;
+extern crate ds323x;
+use ds323x::{ Ds323x, Hours, WeekdayAlarm1, Alarm1Matching };
+
+fn main() {
+    let dev = hal::I2cdev::new("/dev/i2c-1").unwrap();
+    let mut rtc = Ds323x::new_ds3232(dev);
+    let alarm1 = WeekdayAlarm1 {
+        weekday: 1,
+        hour: Hours::H24(7),
+        minute: 2,
+        second: 15
+    };
+    rtc.set_alarm1_weekday(alarm1, Alarm1Matching::AllMatch).unwrap();
+
+    let _dev = rtc.destroy_ds3232();
+}

examples/linux_alarm2.rs

@@ -0,0 +1,23 @@
+//! Set the Alarm2 to each day at the same time and enable interrupts on output.
+//!
+//! The INT/SQW output pin will be set to 1 when it the alarm matches.
+
+extern crate linux_embedded_hal as hal;
+extern crate ds323x;
+use ds323x::{ Ds323x, Hours, DayAlarm2, Alarm2Matching };
+
+fn main() {
+    let dev = hal::Spidev::open("/dev/spidev0.0").unwrap();
+    let chip_select = hal::Pin::new(24);
+    let mut rtc = Ds323x::new_ds3234(dev, chip_select);
+    let alarm2 = DayAlarm2 {
+        day: 1, // does not matter given the chosen matching
+        hour: Hours::AM(11),
+        minute: 2
+    };
+    rtc.set_alarm2_day(alarm2, Alarm2Matching::HoursAndMinutesMatch).unwrap();
+    rtc.use_int_sqw_output_as_interrupt().unwrap();
+    rtc.enable_alarm2_interrupts().unwrap();
+
+    let (_dev, _chip_select_pin) = rtc.destroy_ds3234();
+}