Remove `I2cInterface`. (#20)

* Merge `ReadData` and `WriteData` traits.

* Remove `I2cInterface`.

* Update changelog.

* Fix links.

1 files changed, 19 insertions, 5 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))
     }