Add function to read the temperature

src/ds323x/status.rs

@@ -31,4 +31,20 @@ where
         }
         Ok(())
     }
+
+    /// Read the temperature.
+    pub fn get_temperature(&mut self) -> Result<f32, Error<E>> {
+        let mut data = [Register::TEMP_MSB, 0, 0];
+        self.iface.read_data(&mut data)?;
+        let is_negative = (data[1] & 0b1000_0000) != 0;
+        let temp = ((data[1] as u16) << 2) | (data[2] >> 6) as u16;
+        if is_negative {
+            let temp_sign_extended = temp | 0b1111_1100_0000_0000;
+            Ok(temp_sign_extended as i16 as f32 * 0.25)
+        }
+        else {
+            let temp = ((data[1] as u16) << 2) | (data[2] >> 6) as u16;
+            Ok(temp as f32 * 0.25)
+        }
+    }
 }

src/lib.rs

@@ -287,6 +287,7 @@ impl Register {
     const CONTROL      : u8 = 0x0E;
     const STATUS       : u8 = 0x0F;
     const AGING_OFFSET : u8 = 0x10;
+    const TEMP_MSB     : u8 = 0x11;
 }
 
 struct BitFlags;

tests/common/mod.rs

@@ -19,6 +19,7 @@ impl Register {
     pub const CONTROL      : u8 = 0x0E;
     pub const STATUS       : u8 = 0x0F;
     pub const AGING_OFFSET : u8 = 0x10;
+    pub const TEMP_MSB     : u8 = 0x11;
 }
 
 pub struct BitFlags;

tests/status.rs

@@ -13,3 +13,7 @@ get_param_test!(is_not_busy, is_busy, STATUS, false, 0xFF & !BF::BUSY);
 
 get_param_test!(stopped,     has_been_stopped, STATUS, true,  0xFF);
 get_param_test!(not_stopped, has_been_stopped, STATUS, false, 0xFF & !BF::OSC_STOP);
+
+get_param_read_array_test!(temp_0,   get_temperature,    0.0,  TEMP_MSB, [0, 0], [0, 0]);
+get_param_read_array_test!(temp_min, get_temperature, -128.0,  TEMP_MSB, [0b1000_0000, 0], [0, 0]);
+get_param_read_array_test!(temp_max, get_temperature,  127.75, TEMP_MSB, [0b0111_1111, 0b1100_0000], [0, 0]);