bq40z50 0.1.2

Rust driver for Texas Instrument BQ40Z50 battery manager.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

#![no_std]
use byteorder::{ByteOrder, LittleEndian};
use embedded_hal::blocking::i2c::WriteRead;

/// I2C address
#[derive(Copy, Clone)]
pub enum Address {
    /// Device address
    Dev = 0x0B,
    /// Register of MAC
    Mac = 0x44,
}

// Read word
#[derive(Copy, Clone)]
pub enum Cmd {
    TemperatureReg = 0x08,
    VoltageReg = 0x09,
    CurrentReg = 0x0A,
    AverageCurrentReg = 0x0B,
    MaxErrorReg = 0x0C,
    RelativeSocReg = 0x0D,
    AbsoluteSocReg = 0x0E,
    RemainingCapacityReg = 0x0F,
    FullChargeCapacityReg = 0x10,
    ChargingCurrentReg = 0x14,
    ChargingVoltageReg = 0x15,
    BatteryStatusReg = 0x16,
    CycleCountReg = 0x17,
    CellVoltage4Reg = 0x3C,
    CellVoltage3Reg = 0x3D,
    CellVoltage2Reg = 0x3E,
    CellVoltage1Reg = 0x3F,
    SohReg = 0x4F,
}

// Read word
#[derive(Copy, Clone)]
pub enum CmdBlock {
    DEVICENAMEReg = 0x21,
}

#[derive(Clone, Copy, Debug)]
pub enum Error<I2cError> {
    I2cError(I2cError),
}

pub struct BQ40Z50<I2C> {
    i2c: I2C,
}

impl<I2C, I2cError> BQ40Z50<I2C>
where
    I2C: WriteRead<Error = I2cError>,
{
    pub fn new(i2c: I2C) -> BQ40Z50<I2C> {
        BQ40Z50 { i2c: i2c }
    }

    pub fn get_temperature(&mut self) -> Result<f32, Error<I2cError>> {
        let mut buffer = [0u8; 2];
        self.i2c.write_read(
            Address::Dev as u8,
            &[Cmd::TemperatureReg as u8],
            &mut buffer,
        )?;
        Ok(convert_temperature(LittleEndian::read_u16(&buffer[0..2])))
    }

    pub fn get_voltage(&mut self) -> Result<u32, Error<I2cError>> {
        let mut buffer = [0u8; 2];
        self.i2c
            .write_read(Address::Dev as u8, &[Cmd::VoltageReg as u8], &mut buffer)?;
        Ok(LittleEndian::read_u32(&buffer[0..2]))
    }

    pub fn get_current(&mut self) -> Result<u32, Error<I2cError>> {
        let mut buffer = [0u8; 2];
        self.i2c
            .write_read(Address::Dev as u8, &[Cmd::CurrentReg as u8], &mut buffer)?;
        Ok(LittleEndian::read_u32(&buffer[0..2]))
    }

    pub fn get_cell_voltage_1(&mut self) -> Result<u32, Error<I2cError>> {
        let mut buffer = [0u8; 2];
        self.i2c.write_read(
            Address::Dev as u8,
            &[Cmd::CellVoltage1Reg as u8],
            &mut buffer,
        )?;
        Ok(LittleEndian::read_u32(&buffer[0..2]))
    }

    pub fn get_cell_voltage_2(&mut self) -> Result<u32, Error<I2cError>> {
        let mut buffer = [0u8; 2];
        self.i2c.write_read(
            Address::Dev as u8,
            &[Cmd::CellVoltage2Reg as u8],
            &mut buffer,
        )?;
        Ok(LittleEndian::read_u32(&buffer[0..2]))
    }

    pub fn get_cell_voltage_3(&mut self) -> Result<u32, Error<I2cError>> {
        let mut buffer = [0u8; 2];
        self.i2c.write_read(
            Address::Dev as u8,
            &[Cmd::CellVoltage3Reg as u8],
            &mut buffer,
        )?;
        Ok(LittleEndian::read_u32(&buffer[0..2]))
    }

    pub fn get_cell_voltage_4(&mut self) -> Result<u32, Error<I2cError>> {
        let mut buffer = [0u8; 2];
        self.i2c.write_read(
            Address::Dev as u8,
            &[Cmd::CellVoltage4Reg as u8],
            &mut buffer,
        )?;
        Ok(LittleEndian::read_u32(&buffer[0..2]))
    }
}

fn convert_temperature(raw: u16) -> f32 {
    raw as f32 / 10.0 - 273.15
}

impl<E> From<E> for Error<E> {
    fn from(error: E) -> Self {
        Error::I2cError(error)
    }
}