Implement i2c traits of embedded_hal

Author: phil-opp

Cargo.lock

@@ -15,6 +15,7 @@ bitflags = "1.0.3"
 volatile = "0.2.4"
 bit_field = "0.9.0"
 bare-metal = "0.2.3"
+embedded-hal = "0.2.1"
 
 [dependencies.stm32f7]
 version = "0.3.2"

Cargo.toml

@@ -4,6 +4,7 @@ use stm32f7::stm32f7x6::{
     i2c1::{self, RegisterBlock},
     RCC,
 };
+use embedded_hal;
 
 // TODO use &mut when svd2rust API has changed (modification should require &mut)
 //pub struct I2C<'a>(&'a mut RegisterBlock);
@@ -355,6 +356,33 @@ impl<'a> I2C<'a> {
     }
 }
 
+impl <'a> embedded_hal::blocking::i2c::Read for I2C<'a> {
+    type Error = Error;
+
+    fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Self::Error> {
+        self.connect(Address::bits_7(address), |mut connection: I2cConnection<u8>| connection.read_bytes_raw(buffer.iter_mut()))
+    }
+}
+
+impl <'a> embedded_hal::blocking::i2c::Write for I2C<'a> {
+    type Error = Error;
+
+    fn write(&mut self, address: u8, bytes: &[u8]) -> Result<(), Self::Error> {
+        self.connect(Address::bits_7(address), |mut connection: I2cConnection<u8>| connection.write_bytes(bytes.iter().map(|b| *b)))
+    }
+}
+
+impl <'a> embedded_hal::blocking::i2c::WriteRead for I2C<'a> {
+    type Error = Error;
+
+    fn write_read(&mut self, address: u8, bytes: &[u8], buffer: &mut [u8]) -> Result<(), Self::Error> {
+        self.connect(Address::bits_7(address), |mut connection: I2cConnection<u8>| {
+            connection.write_bytes(bytes.iter().map(|b| *b))?;
+            connection.read_bytes_raw(buffer.iter_mut())
+        })
+    }
+}
+
 pub fn init<'a>(i2c: &'a RegisterBlock, rcc: &mut RCC) -> I2C<'a> {
     // enable clocks
     rcc.apb1enr.modify(|_, w| w.i2c3en().enabled());

src/i2c.rs

@@ -19,6 +19,7 @@ extern crate byteorder;
 extern crate cortex_m_rt as rt;
 extern crate smoltcp;
 extern crate volatile;
+extern crate embedded_hal;
 
 pub mod ethernet;
 pub mod gpio;