Remove `I2cInterface`. (#20)

* Merge `ReadData` and `WriteData` traits.

* Remove `I2cInterface`.

* Update changelog.

* Fix links.

5 files changed, 59 insertions, 47 deletions

diff --git a/src/devices/common.rs b/src/devices/common.rs
index f1509d3..5fed33f 100644
--- a/src/devices/common.rs
+++ b/src/devices/common.rs
@@ -1,17 +1,31 @@
 //! Common functions
 
-use crate::{devices::OperatingMode, interface, Ads1x1x, BitFlags, Config, Error, Register};
+use crate::{devices::OperatingMode, Ads1x1x, BitFlags, Config, Error, Register};
 
-impl<DI, IC, CONV, MODE, E> Ads1x1x<DI, IC, CONV, MODE>
+impl<I2C, IC, CONV, MODE, E> Ads1x1x<I2C, IC, CONV, MODE>
 where
-    DI: interface::WriteData<Error = E> + interface::ReadData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
 {
+    pub(super) fn write_register(&mut self, register: u8, data: u16) -> Result<(), Error<E>> {
+        let data = data.to_be_bytes();
+        let payload: [u8; 3] = [register, data[0], data[1]];
+        self.i2c.write(self.address, &payload).map_err(Error::I2C)
+    }
+
+    pub(super) fn read_register(&mut self, register: u8) -> Result<u16, Error<E>> {
+        let mut data = [0, 0];
+        self.i2c
+            .write_read(self.address, &[register], &mut data)
+            .map_err(Error::I2C)
+            .and(Ok(u16::from_be_bytes(data)))
+    }
+
     pub(super) fn set_operating_mode(&mut self, mode: OperatingMode) -> Result<(), Error<E>> {
         let config = match mode {
             OperatingMode::OneShot => self.config.with_high(BitFlags::OP_MODE),
             OperatingMode::Continuous => self.config.with_low(BitFlags::OP_MODE),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
@@ -19,7 +33,7 @@ where
     /// Read whether a measurement is currently in progress.
     pub fn is_measurement_in_progress(&mut self) -> Result<bool, Error<E>> {
         let config = Config {
-            bits: self.iface.read_register(Register::CONFIG)?,
+            bits: self.read_register(Register::CONFIG)?,
         };
         Ok(!config.is_high(BitFlags::OS))
     }
diff --git a/src/devices/features/tier1.rs b/src/devices/features/tier1.rs
index 0c940ee..c6aa8cd 100644
--- a/src/devices/features/tier1.rs
+++ b/src/devices/features/tier1.rs
@@ -1,12 +1,10 @@
 //! Common functions
 
-use crate::{
-    ic, interface, Ads1x1x, BitFlags as BF, DataRate12Bit, DataRate16Bit, Error, Register,
-};
+use crate::{ic, Ads1x1x, BitFlags as BF, DataRate12Bit, DataRate16Bit, Error, Register};
 
-impl<DI, IC, MODE, E> Ads1x1x<DI, IC, ic::Resolution12Bit, MODE>
+impl<I2C, IC, MODE, E> Ads1x1x<I2C, IC, ic::Resolution12Bit, MODE>
 where
-    DI: interface::WriteData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
 {
     /// Set data rate
     pub fn set_data_rate(&mut self, rate: DataRate12Bit) -> Result<(), Error<E>> {
@@ -21,15 +19,15 @@ where
             DR::Sps2400 => cfg.with_high(BF::DR2).with_low(BF::DR1).with_high(BF::DR0),
             DR::Sps3300 => cfg.with_high(BF::DR2).with_high(BF::DR1).with_low(BF::DR0),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
 }
 
-impl<DI, IC, MODE, E> Ads1x1x<DI, IC, ic::Resolution16Bit, MODE>
+impl<I2C, IC, MODE, E> Ads1x1x<I2C, IC, ic::Resolution16Bit, MODE>
 where
-    DI: interface::WriteData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
 {
     /// Set data rate
     pub fn set_data_rate(&mut self, rate: DataRate16Bit) -> Result<(), Error<E>> {
@@ -45,7 +43,7 @@ where
             DR::Sps475 => cfg.with_high(BF::DR2).with_high(BF::DR1).with_low(BF::DR0),
             DR::Sps860 => cfg.with_high(BF::DR2).with_high(BF::DR1).with_high(BF::DR0),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
diff --git a/src/devices/features/tier2.rs b/src/devices/features/tier2.rs
index 96330a0..4eb989e 100644
--- a/src/devices/features/tier2.rs
+++ b/src/devices/features/tier2.rs
@@ -3,13 +3,13 @@
 //! These are the features included only in ADS1x14, ADS1x15
 
 use crate::{
-    conversion, ic, interface, Ads1x1x, BitFlags as BF, ComparatorLatching, ComparatorMode,
+    conversion, ic, Ads1x1x, BitFlags as BF, ComparatorLatching, ComparatorMode,
     ComparatorPolarity, ComparatorQueue, Error, FullScaleRange, Register,
 };
 
-impl<DI, IC, CONV, MODE, E> Ads1x1x<DI, IC, CONV, MODE>
+impl<I2C, IC, CONV, MODE, E> Ads1x1x<I2C, IC, CONV, MODE>
 where
-    DI: interface::WriteData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
     IC: ic::Tier2Features,
     CONV: conversion::ConvertThreshold<E>,
 {
@@ -42,7 +42,7 @@ where
                 .with_low(BF::PGA1)
                 .with_high(BF::PGA0),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
@@ -55,7 +55,7 @@ where
     /// selected. See [`FullScaleRange`](enum.FullScaleRange.html).
     pub fn set_low_threshold_raw(&mut self, value: i16) -> Result<(), Error<E>> {
         let register_value = CONV::convert_threshold(value)?;
-        self.iface.write_register(Register::LOW_TH, register_value)
+        self.write_register(Register::LOW_TH, register_value)
     }
 
     /// Set raw comparator upper threshold
@@ -66,7 +66,7 @@ where
     /// selected. See [`FullScaleRange`](enum.FullScaleRange.html).
     pub fn set_high_threshold_raw(&mut self, value: i16) -> Result<(), Error<E>> {
         let register_value = CONV::convert_threshold(value)?;
-        self.iface.write_register(Register::HIGH_TH, register_value)
+        self.write_register(Register::HIGH_TH, register_value)
     }
 
     /// Set comparator mode
@@ -75,7 +75,7 @@ where
             ComparatorMode::Traditional => self.config.with_low(BF::COMP_MODE),
             ComparatorMode::Window => self.config.with_high(BF::COMP_MODE),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
@@ -89,7 +89,7 @@ where
             ComparatorPolarity::ActiveLow => self.config.with_low(BF::COMP_POL),
             ComparatorPolarity::ActiveHigh => self.config.with_high(BF::COMP_POL),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
@@ -103,7 +103,7 @@ where
             ComparatorLatching::Nonlatching => self.config.with_low(BF::COMP_LAT),
             ComparatorLatching::Latching => self.config.with_high(BF::COMP_LAT),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
@@ -117,7 +117,7 @@ where
             ComparatorQueue::Two => self.config.with_low(BF::COMP_QUE1).with_high(BF::COMP_QUE0),
             ComparatorQueue::Four => self.config.with_high(BF::COMP_QUE1).with_low(BF::COMP_QUE0),
         };
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
@@ -132,7 +132,7 @@ where
             .config
             .with_high(BF::COMP_QUE1)
             .with_high(BF::COMP_QUE0);
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
@@ -153,7 +153,7 @@ where
         {
             self.disable_comparator()?;
         }
-        self.iface.write_register(Register::HIGH_TH, 0x8000)?;
-        self.iface.write_register(Register::LOW_TH, 0)
+        self.write_register(Register::HIGH_TH, 0x8000)?;
+        self.write_register(Register::LOW_TH, 0)
     }
 }
diff --git a/src/devices/mode/continuous.rs b/src/devices/mode/continuous.rs
index b3b4807..edc87c2 100644
--- a/src/devices/mode/continuous.rs
+++ b/src/devices/mode/continuous.rs
@@ -1,25 +1,25 @@
 //! Continuous measurement mode
 
 use crate::{
-    conversion, devices::OperatingMode, interface, mode, Ads1x1x, ChannelId, Error,
-    ModeChangeError, Register,
+    conversion, devices::OperatingMode, mode, Ads1x1x, ChannelId, Error, ModeChangeError, Register,
 };
 use core::marker::PhantomData;
 
-impl<DI, IC, CONV, E> Ads1x1x<DI, IC, CONV, mode::Continuous>
+impl<I2C, IC, CONV, E> Ads1x1x<I2C, IC, CONV, mode::Continuous>
 where
-    DI: interface::ReadData<Error = E> + interface::WriteData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
     CONV: conversion::ConvertMeasurement,
 {
     /// Change operating mode to OneShot
     pub fn into_one_shot(
         mut self,
-    ) -> Result<Ads1x1x<DI, IC, CONV, mode::OneShot>, ModeChangeError<E, Self>> {
+    ) -> Result<Ads1x1x<I2C, IC, CONV, mode::OneShot>, ModeChangeError<E, Self>> {
         if let Err(Error::I2C(e)) = self.set_operating_mode(OperatingMode::OneShot) {
             return Err(ModeChangeError::I2C(e, self));
         }
         Ok(Ads1x1x {
-            iface: self.iface,
+            i2c: self.i2c,
+            address: self.address,
             config: self.config,
             fsr: self.fsr,
             a_conversion_was_started: false,
@@ -31,7 +31,7 @@ where
 
     /// Read the most recent measurement
     pub fn read(&mut self) -> Result<i16, Error<E>> {
-        let value = self.iface.read_register(Register::CONVERSION)?;
+        let value = self.read_register(Register::CONVERSION)?;
         Ok(CONV::convert_measurement(value))
     }
 
@@ -43,7 +43,7 @@ where
     #[allow(unused_variables)]
     pub fn select_channel<CH: ChannelId<Self>>(&mut self, channel: CH) -> Result<(), Error<E>> {
         let config = self.config.with_mux_bits(CH::channel_id());
-        self.iface.write_register(Register::CONFIG, config.bits)?;
+        self.write_register(Register::CONFIG, config.bits)?;
         self.config = config;
         Ok(())
     }
diff --git a/src/devices/mode/oneshot.rs b/src/devices/mode/oneshot.rs
index 0663e4b..957eba5 100644
--- a/src/devices/mode/oneshot.rs
+++ b/src/devices/mode/oneshot.rs
@@ -1,24 +1,25 @@
 //! Common functions
 use crate::{
-    conversion, devices::OperatingMode, interface, mode, Ads1x1x, BitFlags, ChannelId,
-    ChannelSelection, Config, DynamicOneShot, Error, ModeChangeError, Register,
+    conversion, devices::OperatingMode, mode, Ads1x1x, BitFlags, ChannelId, ChannelSelection,
+    Config, DynamicOneShot, Error, ModeChangeError, Register,
 };
 use core::marker::PhantomData;
 
-impl<DI, IC, CONV, E> Ads1x1x<DI, IC, CONV, mode::OneShot>
+impl<I2C, IC, CONV, E> Ads1x1x<I2C, IC, CONV, mode::OneShot>
 where
-    DI: interface::WriteData<Error = E> + interface::ReadData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
     CONV: conversion::ConvertMeasurement,
 {
     /// Change operating mode to Continuous
     pub fn into_continuous(
         mut self,
-    ) -> Result<Ads1x1x<DI, IC, CONV, mode::Continuous>, ModeChangeError<E, Self>> {
+    ) -> Result<Ads1x1x<I2C, IC, CONV, mode::Continuous>, ModeChangeError<E, Self>> {
         if let Err(Error::I2C(e)) = self.set_operating_mode(OperatingMode::Continuous) {
             return Err(ModeChangeError::I2C(e, self));
         }
         Ok(Ads1x1x {
-            iface: self.iface,
+            i2c: self.i2c,
+            address: self.address,
             config: self.config,
             fsr: self.fsr,
             a_conversion_was_started: true,
@@ -30,13 +31,13 @@ where
 
     fn trigger_measurement(&mut self, config: &Config) -> Result<(), Error<E>> {
         let config = config.with_high(BitFlags::OS);
-        self.iface.write_register(Register::CONFIG, config.bits)
+        self.write_register(Register::CONFIG, config.bits)
     }
 }
 
-impl<DI, IC, CONV, E> Ads1x1x<DI, IC, CONV, mode::OneShot>
+impl<I2C, IC, CONV, E> Ads1x1x<I2C, IC, CONV, mode::OneShot>
 where
-    DI: interface::ReadData<Error = E> + interface::WriteData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
     CONV: conversion::ConvertMeasurement,
 {
     fn read_inner(&mut self, channel: ChannelSelection) -> nb::Result<i16, Error<E>> {
@@ -51,7 +52,6 @@ where
         if self.a_conversion_was_started && same_channel {
             // result is ready
             let value = self
-                .iface
                 .read_register(Register::CONVERSION)
                 .map_err(nb::Error::Other)?;
             self.a_conversion_was_started = false;
@@ -83,9 +83,9 @@ where
     }
 }
 
-impl<DI, IC, CONV, E> DynamicOneShot for Ads1x1x<DI, IC, CONV, mode::OneShot>
+impl<I2C, IC, CONV, E> DynamicOneShot for Ads1x1x<I2C, IC, CONV, mode::OneShot>
 where
-    DI: interface::ReadData<Error = E> + interface::WriteData<Error = E>,
+    I2C: embedded_hal::i2c::I2c<Error = E>,
     CONV: conversion::ConvertMeasurement,
 {
     type Error = Error<E>;