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//! I2C interface
extern crate embedded_hal as hal;
use hal::blocking;
use {private, Error};
/// I2C interface
#[derive(Debug, Default)]
pub struct I2cInterface<I2C> {
pub(crate) i2c: I2C,
pub(crate) address: u8,
}
/// Write data
pub trait WriteData: private::Sealed {
/// Error type
type Error;
/// Write to an u16 register
fn write_register(&mut self, register: u8, data: u16) -> Result<(), Error<Self::Error>>;
}
impl<I2C, E> WriteData for I2cInterface<I2C>
where
I2C: blocking::i2c::Write<Error = E>,
{
type Error = E;
fn write_register(&mut self, register: u8, data: u16) -> Result<(), Error<E>> {
let payload: [u8; 3] = [register, (data >> 8) as u8, data as u8];
self.i2c.write(self.address, &payload).map_err(Error::I2C)
}
}
/// Read data
pub trait ReadData: private::Sealed {
/// Error type
type Error;
/// Read an u16 register
fn read_register(&mut self, register: u8) -> Result<u16, Error<Self::Error>>;
}
impl<I2C, E> ReadData for I2cInterface<I2C>
where
I2C: blocking::i2c::WriteRead<Error = E>,
{
type Error = E;
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(data[0]) << 8) | u16::from(data[1])))
}
}
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