Replace u8 with IIRFilterSize enum

examples/reading_temperature.rs

@@ -26,13 +26,13 @@ fn main() -> result::Result<
         .with_humidity_oversampling(OversamplingSetting::OS2x)
         .with_pressure_oversampling(OversamplingSetting::OS4x)
         .with_temperature_oversampling(OversamplingSetting::OS8x)
-        .with_temperature_filter(2)
+        .with_temperature_filter(IIRFilterSize::Size3)
         .with_gas_measurement(Duration::from_millis(1500), 320, 25)
         .with_run_gas(true)
         .build();
 
     let profile_dur = dev.get_profile_dur(&settings.0)?;
-    info!("Duration {:?}", profile_dur);
+    info!("Profile duration {:?}", profile_dur);
     info!("Setting sensor settings");
     dev.set_sensor_settings(settings)?;
     info!("Setting forced power modes");

src/lib.rs

@@ -12,8 +12,8 @@ extern crate embedded_hal as hal;
 #[macro_use]
 extern crate log;
 
-pub use self::settings::{DesiredSensorSettings, GasSett, OversamplingSetting, SensorSettings,
-                         Settings, SettingsBuilder, TphSett};
+pub use self::settings::{DesiredSensorSettings, GasSett, IIRFilterSize, OversamplingSetting,
+                         SensorSettings, Settings, SettingsBuilder, TphSett};
 
 mod calc;
 mod settings;
@@ -496,12 +496,13 @@ where
         let mut element_index = 0;
         /* Selecting the filter */
         if desired_settings.contains(DesiredSensorSettings::FILTER_SEL) {
-            let tph_sett_filter = boundary_check::<I2C>(tph_sett.filter, "TphSett.filter", 0, 7)?;
             let mut data =
                 I2CUtil::read_byte(&mut self.i2c, self.dev_id.addr(), BME680_CONF_ODR_FILT_ADDR)?;
 
             debug!("FILTER_SEL: true");
-            data = (data as (i32) & !0x1ci32 | tph_sett_filter as (i32) << 2i32 & 0x1ci32) as (u8);
+            data = (data as (i32) & !0x1ci32
+                | tph_sett.filter.unwrap_or(IIRFilterSize::Size0) as (i32) << 2i32 & 0x1ci32)
+                as (u8);
             reg[element_index] = (BME680_CONF_ODR_FILT_ADDR, data);
             element_index += 1;
         }
@@ -611,8 +612,9 @@ where
         }
 
         if desired_settings.contains(DesiredSensorSettings::FILTER_SEL) {
-            sensor_settings.tph_sett.filter =
-                Some(((data_array[5usize] as (i32) & 0x1ci32) >> 2i32) as (u8));
+            sensor_settings.tph_sett.filter = Some(IIRFilterSize::from_u8(
+                ((data_array[5usize] as (i32) & 0x1ci32) >> 2i32) as (u8),
+            ));
         }
 
         if desired_settings

src/settings.rs

@@ -26,13 +26,43 @@ impl OversamplingSetting {
     }
 }
 
+#[derive(Copy, Clone, Debug)]
+#[repr(u8)]
+pub enum IIRFilterSize {
+    Size0 = 0,
+    Size1 = 1,
+    Size3 = 2,
+    Size7 = 3,
+    Size15 = 4,
+    Size31 = 5,
+    Size63 = 6,
+    Size127 = 7,
+}
+
+impl IIRFilterSize {
+    // TODO replace with TryFrom once stabilized
+    pub fn from_u8(os: u8) -> IIRFilterSize {
+        match os {
+            0 => IIRFilterSize::Size0,
+            1 => IIRFilterSize::Size1,
+            2 => IIRFilterSize::Size3,
+            3 => IIRFilterSize::Size7,
+            4 => IIRFilterSize::Size15,
+            5 => IIRFilterSize::Size31,
+            6 => IIRFilterSize::Size63,
+            7 => IIRFilterSize::Size127,
+            _ => panic!("Unknown IIRFilterSize: {}", os),
+        }
+    }
+}
+
 #[derive(Debug, Default, Copy)]
 #[repr(C)]
 pub struct TphSett {
     pub os_hum: Option<OversamplingSetting>,
     pub os_temp: Option<OversamplingSetting>,
     pub os_pres: Option<OversamplingSetting>,
-    pub filter: Option<u8>,
+    pub filter: Option<IIRFilterSize>,
 }
 
 impl Clone for TphSett {
@@ -114,7 +144,7 @@ impl SettingsBuilder {
             sensor_settings: Default::default(),
         }
     }
-    pub fn with_temperature_filter(mut self, filter: u8) -> SettingsBuilder {
+    pub fn with_temperature_filter(mut self, filter: IIRFilterSize) -> SettingsBuilder {
         self.sensor_settings.tph_sett.filter = Some(filter);
         self.desired_settings |= DesiredSensorSettings::FILTER_SEL;
         self