Add support for setting the comparator mode

3 files changed, 43 insertions, 1 deletions

diff --git a/src/devices/ads1x1x/features/mod.rs b/src/devices/ads1x1x/features/mod.rs
index ad26258..c24b7b4 100644
--- a/src/devices/ads1x1x/features/mod.rs
+++ b/src/devices/ads1x1x/features/mod.rs
@@ -2,4 +2,4 @@
 //! support.
 
 mod tier1;
-
+mod tier2;
diff --git a/src/devices/ads1x1x/features/tier2.rs b/src/devices/ads1x1x/features/tier2.rs
new file mode 100644
index 0000000..d238691
--- /dev/null
+++ b/src/devices/ads1x1x/features/tier2.rs
@@ -0,0 +1,23 @@
+//! Tier 2 features.
+//!
+//! These are the features included only in ADS1x14, ADS1x15
+
+use { Ads1x1x, Error, interface, ic, ComparatorMode, Register, BitFlags };
+
+impl<DI, IC, MODE, E> Ads1x1x<DI, IC, MODE>
+where
+    DI: interface::WriteData<Error = E>,
+    IC: ic::Resolution + ic::Tier2Features
+{
+    /// Set comparator mode
+    pub fn set_comparator_mode(&mut self, mode: ComparatorMode) -> Result<(), Error<E>> {
+        let config;
+        match mode {
+            ComparatorMode::Traditional => config = self.config.with_low(BitFlags::COMP_MODE),
+            ComparatorMode::Window      => config = self.config.with_high(BitFlags::COMP_MODE)
+        }
+        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.config = config;
+        Ok(())
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 5d4c3fa..a35f8f7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -98,6 +98,24 @@ pub enum DataRate {
     Sps3300
 }
 
+/// Comparator mode (only for ADS1x14, ADS1x15)
+#[derive(Debug, Clone)]
+pub enum ComparatorMode {
+    /// Traditional comparator (default)
+    ///
+    /// In this mode the ALERT/RDY pin asserts (according to selected active
+    /// polarity) when the conversion data exceeds the limit set as *high*
+    /// threshold and remains active until the conversion data falls below the
+    /// value set as *low* threshold.
+    Traditional,
+    /// Window comparator
+    ///
+    /// In this mode the ALERT/RDY pin asserts (according to selected active
+    /// polarity) when the conversion data exceeds the value set as *high*
+    /// threshold or goes below the value set as *low* temperature threshold.
+    Window
+}
+
 /// Possible slave addresses
 #[derive(Debug, Clone)]
 pub enum SlaveAddr {
@@ -141,6 +159,7 @@ impl BitFlags {
     const DR2          : u16 = 0b0000_0000_1000_0000;
     const DR1          : u16 = 0b0000_0000_0100_0000;
     const DR0          : u16 = 0b0000_0000_0010_0000;
+    const COMP_MODE    : u16 = 0b0000_0000_0001_0000;
 }