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#![no_std]
extern crate byteorder;
extern crate embedded_hal as hal;
use byteorder::{ByteOrder, BigEndian};
use hal::blocking::i2c;
pub const INA219_ADDR: u8 = 0x41;
enum Register {
ShuntVoltage = 0x01,
BusVoltage = 0x02,
Power = 0x03,
Current = 0x04,
Calibration = 0x05
}
pub struct INA219<I2C> {
i2c: I2C,
address: u8
}
impl<I2C, E> INA219<I2C>
where I2C: i2c::Write<Error = E> + i2c::Read<Error = E> {
pub fn new(i2c: I2C, address: u8) -> INA219<I2C> {
INA219 {
i2c,
address
}
}
pub fn calibrate(&mut self, value: u16) -> Result<(), E> {
self.i2c.write(self.address, &[
Register::Calibration as u8,
(value >> 8) as u8,
value as u8
])?;
Ok(())
}
pub fn shunt_voltage(&mut self) -> Result<i16, E> {
let value = self.read(Register::ShuntVoltage)?;
Ok(value as i16)
}
pub fn voltage(&mut self) -> Result<u16, E> {
let value = self.read(Register::BusVoltage)?;
Ok((value >> 3) * 4)
}
pub fn power(&mut self) -> Result<i16, E> {
let value = self.read(Register::Power)?;
Ok(value as i16)
}
pub fn current(&mut self) -> Result<i16, E> {
let value = self.read(Register::Current)?;
Ok(value as i16)
}
fn read(&mut self, register: Register) -> Result<u16, E> {
let mut buf: [u8; 2] = [0x00; 2];
self.i2c.write(self.address, &[register as u8])?;
self.i2c.read(self.address, &mut buf)?;
Ok(BigEndian::read_u16(&buf))
}
}