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#![cfg_attr(not(std), no_std)]
#![feature(const_generics)]
#![feature(const_evaluatable_checked)]
#![feature(const_panic)]
use core::fmt;
use core::fmt::Formatter;
use embedded_hal;
#[cfg(feature = "crc")]
use crc_any::CRCu8;
use core::ops::Sub;
use bitflags::bitflags;
use serde::{Serialize, Deserialize};
pub const BQ76920: usize = 5;
pub const BQ76930: usize = 10;
pub const BQ76940: usize = 15;
pub struct BQ769x0<const X: usize> {
dev_address: u8,
init_complete: bool,
adc_gain: u16,
adc_offset: i8,
shunt: MicroOhms,
cell_count: u8,
cells: [MilliVolts; X]
}
#[derive(Debug, Copy, Clone)]
pub enum Error {
CRCMismatch,
I2CError,
BufTooLarge,
Uninitialized,
VerifyError(u8),
OCDSCDRangeMismatch,
UVThresholdUnobtainable(MilliVolts, MilliVolts),
OVThresholdUnobtainable(MilliVolts, MilliVolts),
}
pub struct Stat {
bits: u8
}
impl Stat {
pub fn cc_ready_is_set(&self) -> bool { self.bits & (1u8 << 7) != 0 }
pub fn device_xready_is_set(&self) -> bool { self.bits & (1u8 << 5) != 0 }
pub fn ovrd_alert_is_set(&self) -> bool { self.bits & (1u8 << 4) != 0 }
pub fn undervoltage_is_set(&self) -> bool { self.bits & (1u8 << 3) != 0 }
pub fn overvoltage_is_set(&self) -> bool { self.bits & (1u8 << 2) != 0 }
pub fn scd_is_set(&self) -> bool { self.bits & (1u8 << 1) != 0 }
pub fn ocd_is_set(&self) -> bool { self.bits & (1u8 << 0) != 0 }
pub fn is_ok(&self) -> bool { self.bits & 0b0011_1111 == 0 }
}
bitflags! {
pub struct SysStat: u8 {
const CC_READY = 0b1000_0000;
const DEVICE_XREADY = 0b0010_0000;
const OVRD_ALERT = 0b0001_0000;
const UNDERVOLTAGE = 0b0000_1000;
const OVERVOLTAGE = 0b0000_0100;
const SHORTCIRCUIT = 0b0000_0010;
const OVERCURRENT = 0b0000_0001;
const ALL = 0b1011_1111;
}
}
impl fmt::Debug for Stat {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
let _ = write!(f, "(");
if self.cc_ready_is_set() {
let _ = write!(f, "CC_READY, ");
};
if self.device_xready_is_set() {
let _ = write!(f, "XREADY, ");
};
if self.ovrd_alert_is_set() {
let _ = write!(f, "ALERT, ");
};
if self.undervoltage_is_set() {
let _ = write!(f, "UV, ");
};
if self.overvoltage_is_set() {
let _ = write!(f, "OV, ");
};
if self.scd_is_set() {
let _ = write!(f, "SCD, ");
};
if self.ocd_is_set() {
let _ = write!(f, "OCD, ");
};
write!(f, ")")
}
}
pub enum SCDDelay {
_70uS,
_100uS,
_200uS,
_400uS
}
impl SCDDelay {
pub fn bits(&self) -> u8 {
match self {
SCDDelay::_70uS => { 0x0 << 3 },
SCDDelay::_100uS => { 0x1 << 3 },
SCDDelay::_200uS => { 0x2 << 3 },
SCDDelay::_400uS => { 0x3 << 3 },
}
}
}
#[derive(Debug, PartialEq, PartialOrd, Clone, Copy)]
pub struct Amperes(pub u32);
#[derive(Debug, PartialEq, PartialOrd, Clone, Copy, Serialize, Deserialize)]
pub struct MilliAmperes(pub i32);
#[derive(Debug, PartialEq, PartialOrd, Clone, Copy)]
pub struct MicroOhms(pub u32);
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Serialize, Deserialize)]
pub struct MilliVolts(pub u32);
impl Sub for MilliVolts {
type Output = MilliVolts;
fn sub(self, rhs: Self) -> Self::Output {
MilliVolts(self.0 - rhs.0)
}
}
impl fmt::Display for Amperes {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{}A", self.0)
}
}
impl fmt::Display for MilliAmperes {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{}mA", self.0)
}
}
impl fmt::Display for MilliVolts {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{}mV", self.0)
}
}
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
pub struct DegreesCentigrade(pub i32);
impl fmt::Display for DegreesCentigrade {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{}degC", self.0)
}
}
#[derive(Copy, Clone)]
pub enum SCDThreshold {
_22mV = 22,
_33mV = 33,
_44mV = 44,
_56mV = 56,
_67mV = 67,
_78mV = 78,
_89mV = 89,
_100mV = 100,
_111mV = 111,
_133mV = 133,
_155mV = 155,
_178mV = 178,
_200mV = 200
}
#[derive(PartialEq, Clone, Debug)]
pub enum OCDSCDRange {
Lower,
Upper,
Unknown
}
impl OCDSCDRange {
pub fn bits(&self) -> u8 {
match self {
OCDSCDRange::Lower => { 0 << 7 },
OCDSCDRange::Upper => { 1 << 7 },
OCDSCDRange::Unknown => { unreachable!() },
}
}
}
impl SCDThreshold {
pub fn range(&self) -> OCDSCDRange {
use SCDThreshold::*;
match self {
_44mV | _67mV | _89mV => OCDSCDRange::Unknown,
_111mV | _133mV | _155mV | _178mV | _200mV => OCDSCDRange::Upper,
_ => OCDSCDRange::Lower
}
}
pub fn bits(&self, range: OCDSCDRange) -> u8 {
use OCDSCDRange::*;
use SCDThreshold::*;
match range {
Lower => {
match self {
_22mV => { 0x0 }, _33mV => { 0x1 }, _44mV => { 0x2 }, _56mV => { 0x3 },
_67mV => { 0x4 }, _78mV => { 0x5 }, _89mV => { 0x6 }, _100mV => { 0x7 },
_ => { 0x0 }
}
}
Upper => {
match self {
_44mV => { 0x0 }, _67mV => { 0x1 }, _89mV => { 0x2 }, _111mV => { 0x3 },
_133mV => { 0x4 }, _155mV => { 0x5 }, _178mV => { 0x6 }, _200mV => { 0x7 },
_ => { 0x0 }
}
}
_ => { unreachable!() }
}
}
pub fn from_mv(mv_threshold: u8) -> Self {
use SCDThreshold::*;
let thresholds = [_22mV, _33mV, _44mV, _56mV, _67mV, _78mV, _89mV,
_100mV, _111mV, _133mV, _155mV, _178mV, _200mV];
if mv_threshold < 22 {
return _22mV;
} else if mv_threshold > 200 {
return _200mV;
} else {
for t in thresholds.iter() {
if mv_threshold <= *t as u8 {
return *t;
}
}
}
unreachable!();
}
pub fn from_current(threshold: Amperes, shunt: MicroOhms) -> Self {
let mv_threshold = threshold.0 * shunt.0 / 1000;
Self::from_mv(mv_threshold as u8)
}
}
pub enum OCDDelay {
_8ms = 0x0,
_20ms = 0x1,
_40ms = 0x2,
_80ms = 0x3,
_160ms = 0x4,
_320ms = 0x5,
_640ms = 0x6,
_1280ms = 0x7
}
impl OCDDelay {
pub fn bits(&self) -> u8 {
match self {
OCDDelay::_8ms => { 0x0 << 4 },
OCDDelay::_20ms => { 0x1 << 4 },
OCDDelay::_40ms => { 0x2 << 4 },
OCDDelay::_80ms => { 0x3 << 4 },
OCDDelay::_160ms => { 0x4 << 4 },
OCDDelay::_320ms => { 0x5 << 4 },
OCDDelay::_640ms => { 0x6 << 4 },
OCDDelay::_1280ms => { 0x7 << 4 },
}
}
}
#[derive(Copy, Clone, PartialEq)]
pub enum OCDThreshold {
_8mV = 8,
_11mV = 11,
_14mV = 14,
_17mV = 17,
_19mV = 19,
_22mV = 22,
_25mV = 25,
_28mV = 28,
_31mV = 31,
_33mV = 33,
_36mV = 36,
_39mV = 39,
_42mV = 42,
_44mV = 44,
_47mV = 47,
_50mV = 50,
_56mV = 56,
_61mV = 61,
_67mV = 67,
_72mV = 72,
_78mV = 78,
_83mV = 83,
_89mV = 89,
_94mV = 94,
_100mV = 100,
}
impl OCDThreshold {
pub fn range(&self) -> OCDSCDRange {
use OCDThreshold::*;
match self {
_17mV | _22mV | _28mV | _33mV | _39mV | _44mV | _50mV => OCDSCDRange::Unknown,
_56mV | _61mV | _67mV | _72mV | _78mV | _83mV | _89mV | _94mV | _100mV => OCDSCDRange::Upper,
_ => OCDSCDRange::Lower
}
}
pub fn bits(&self, range: OCDSCDRange) -> u8 {
use OCDSCDRange::*;
use OCDThreshold::*;
match range {
Lower => {
match self {
_8mV => { 0x0 }, _11mV => { 0x1 }, _14mV => { 0x2 }, _17mV => { 0x3 },
_19mV => { 0x4 }, _22mV => { 0x5 }, _25mV => { 0x6 }, _28mV => { 0x7 },
_31mV => { 0x8 }, _33mV => { 0x9 }, _36mV => { 0xa }, _39mV => { 0xb },
_42mV => { 0xc }, _44mV => { 0xd }, _47mV => { 0xe }, _50mV => { 0xf },
_ => { 0x0 }
}
}
Upper => {
match self {
_17mV => { 0x0 }, _22mV => { 0x1 }, _28mV => { 0x2 }, _33mV => { 0x3 },
_39mV => { 0x4 }, _44mV => { 0x5 }, _50mV => { 0x6 }, _56mV => { 0x7 },
_61mV => { 0x8 }, _67mV => { 0x9 }, _72mV => { 0xa }, _78mV => { 0xb },
_83mV => { 0xc }, _89mV => { 0xd }, _94mV => { 0xe }, _100mV => { 0xf },
_ => { 0x0 }
}
}
_ => { unreachable!() }
}
}
pub fn from_mv(mv_threshold: u8) -> Self {
use OCDThreshold::*;
let thresholds = [_8mV , _11mV, _14mV, _17mV, _19mV, _22mV, _25mV, _28mV,
_31mV, _33mV, _36mV, _39mV, _42mV, _44mV, _47mV, _50mV, _56mV, _61mV, _67mV, _72mV,
_78mV, _83mV, _89mV, _94mV, _100mV];
if mv_threshold < 8 {
return _8mV;
} else if mv_threshold > 100 {
return _100mV;
} else {
for t in thresholds.iter() {
if mv_threshold <= *t as u8 {
return *t;
}
}
}
unreachable!();
}
pub fn from_current(threshold: Amperes, shunt: MicroOhms) -> Self {
let mv_threshold = threshold.0 * shunt.0 / 1000;
Self::from_mv(mv_threshold as u8)
}
}
pub enum UVDelay {
_1s = 0x0,
_4s = 0x1,
_8s = 0x2,
_16s = 0x3
}
impl UVDelay {
pub fn bits(&self) -> u8 {
match self {
UVDelay::_1s => { 0x0 << 6 },
UVDelay::_4s => { 0x1 << 6 },
UVDelay::_8s => { 0x2 << 6 },
UVDelay::_16s => { 0x3 << 6 },
}
}
}
pub enum OVDelay {
_1s = 0x0,
_4s = 0x1,
_8s = 0x2,
_16s = 0x3
}
impl OVDelay {
pub fn bits(&self) -> u8 {
match self {
OVDelay::_1s => { 0x0 << 4 },
OVDelay::_4s => { 0x1 << 4 },
OVDelay::_8s => { 0x2 << 4 },
OVDelay::_16s => { 0x3 << 4 },
}
}
}
pub struct Config {
pub shunt: MicroOhms,
pub scd_delay: SCDDelay,
pub scd_threshold: Amperes,
pub ocd_delay: OCDDelay,
pub ocd_threshold: Amperes,
pub uv_delay: UVDelay,
pub uv_threshold: MilliVolts,
pub ov_delay: OVDelay,
pub ov_threshold: MilliVolts
}
#[derive(Debug)]
pub struct CalculatedValues {
pub ocdscd_range_used: OCDSCDRange,
pub scd_threshold: Amperes,
pub ocd_threshold: Amperes,
pub uv_threshold: MilliVolts,
pub ov_threshold: MilliVolts
}
impl<const X: usize> BQ769x0<X> where [(); X * 2]: Sized, [(); X * 4]: Sized {
pub const fn new(dev_address: u8, cell_count: u8) -> Option<Self> {
match X {
BQ76920 | BQ76930 | BQ76940 => {
match X {
BQ76920 => {
if cell_count < 3 || cell_count > 5 {
return None;
}
}
BQ76930 => {
if cell_count < 6 || cell_count > 10 {
return None;
}
}
BQ76940 => {
if cell_count < 9 || cell_count > 15 {
return None;
}
},
_ => unreachable!()
}
Some(BQ769x0 {
dev_address,
init_complete: false,
adc_gain: 0,
adc_offset: 0,
shunt: MicroOhms(0),
cell_count,
cells: [MilliVolts(0); X]
})
},
_ => {
None
}
}
}
pub fn adc_gain(&self) -> u16 {
self.adc_gain
}
pub fn adc_offset(&self) -> i8 {
self.adc_offset
}
#[cfg(not(feature = "crc"))]
pub fn read_raw<I2C>(&mut self, i2c: &mut I2C, reg_address: u8, data: &mut [u8]) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
#[cfg(no_std)] {
cortex_m::asm::delay(10000);
}
match i2c.write_read(self.dev_address, &[reg_address], data) {
Ok(_) => { Ok(()) },
Err(_) => { Err(Error::I2CError) },
}
}
#[cfg(feature = "crc")]
pub fn read_raw<I2C>(&mut self, i2c: &mut I2C, reg_address: u8, data: &mut [u8]) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
cortex_m::asm::delay(10000);
if data.len() > X * 2 {
return Err(Error::BufTooLarge);
} else if data.len() == 0 {
return Ok(());
}
let mut buf = [0u8; X * 4];
let r = i2c.write_read(self.dev_address, &[reg_address], &mut buf[0..data.len()*2]);
let mut crc = CRCu8::crc8();
crc.reset();
crc.digest(&[(self.dev_address << 1) | 0b0000_0001, buf[0]]);
if crc.get_crc() != buf[1] {
return Err(Error::CRCMismatch);
}
if data.len() > 1 {
for i in (3..data.len()*2).step_by(2) {
crc.reset();
crc.digest(&[buf[i - 1]]);
if crc.get_crc() != buf[i] {
return Err(Error::CRCMismatch);
}
}
}
return if r.is_ok() {
for (i, b) in data.iter_mut().enumerate() {
*b = buf[i * 2];
}
Ok(())
} else {
Err(Error::I2CError)
}
}
#[cfg(not(feature = "crc"))]
pub fn write_raw<I2C>(&mut self, i2c: &mut I2C, reg_address: u8, data: &[u8]) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
#[cfg(no_std)] {
cortex_m::asm::delay(10000);
}
if data.len() > 8 {
return Err(Error::BufTooLarge);
} else if data.len() == 0 {
return Ok(());
}
let mut buf = [0u8; 8+1];
buf[0] = reg_address;
for (i, b) in data.iter().enumerate() {
buf[i + 1] = *b;
}
i2c.write(self.dev_address, &buf[0..data.len()+1]).map_err(|_| Error::I2CError)?;
i2c.write_read(self.dev_address, &[reg_address], &mut buf[0..data.len()]).map_err(|_| Error::I2CError)?;
for (i, x) in data.iter().zip(buf).enumerate() {
if *x.0 != x.1 {
return Err(Error::VerifyError(reg_address + i as u8));
}
}
Ok(())
}
#[cfg(feature = "crc")]
pub fn write_raw<I2C>(&mut self, i2c: &mut I2C, reg_address: u8, data: &[u8]) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
cortex_m::asm::delay(10000);
if data.len() > 8 {
return Err(Error::BufTooLarge);
} else if data.len() == 0 {
return Ok(());
}
let mut buf = [0u8; 8*2+1];
buf[0] = reg_address;
for (i, b) in data.iter().enumerate() {
buf[i * 2 + 1] = *b;
}
let mut crc = CRCu8::crc8();
crc.reset();
crc.digest(&[(self.dev_address << 1), reg_address, data[0]]);
buf[2] = crc.get_crc();
for i in (4..data.len()*2+1).step_by(2) {
crc.reset();
crc.digest(&[ buf[i-1] ]);
buf[i] = crc.get_crc();
}
i2c.write(self.dev_address, &buf[0..data.len()*2+1]).map_err(|_| Error::I2CError)?;
Ok(())
}
fn read_adc_characteristics<I2C>(&mut self, i2c: &mut I2C) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut gain1_offset = [0u8; 2];
let mut gain2 = [0u8; 1];
self.read_raw(i2c, 0x50, &mut gain1_offset)?;
self.read_raw(i2c, 0x59, &mut gain2)?;
self.adc_gain = 365 + ( ((gain1_offset[0] << 1) & 0b0001_1000) | (gain2[0] >> 5) ) as u16;
self.adc_offset = gain1_offset[1] as i8;
Ok(())
}
pub fn is_initialized(&self) -> bool {
self.init_complete
}
pub fn cell_voltages<I2C>(&mut self, i2c: &mut I2C) -> Result<&[MilliVolts], Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
if !self.is_initialized() {
return Err(Error::Uninitialized);
}
let mut buf = [0u8; X * 2];
self.read_raw(i2c, 0x0c, &mut buf)?;
let adc_tf = self.adc_transfer_function();
for (i, cell) in self.cells.iter_mut().enumerate() {
let adc_reading = ((buf[i * 2] as u16) << 8) | buf[i * 2 + 1] as u16;
*cell = adc_tf.apply(adc_reading);
}
let cc = self.cell_count;
if cc == 3 || cc == 6 || cc == 9 {
self.cells[2] = self.cells[4];
} else if cc == 4 || cc == 7 || cc == 8 || cc == 10 || cc == 11 || cc == 12 {
self.cells[3] = self.cells[4];
}
if (X == BQ76930 || X == BQ76940) && (cc == 6 || cc == 7 || cc == 9 || cc == 10) {
self.cells[7] = self.cells[9];
}
if (X == BQ76930 || X == BQ76940) && (cc == 8 || cc == 9 || cc == 11 || cc == 12 || cc == 13) {
self.cells[8] = self.cells[9];
}
if (X == BQ76940) && (cc == 9 || cc == 10 || cc == 11) {
self.cells[12] = self.cells[14];
}
if (X == BQ76940) && (cc == 12 || cc == 13 || cc == 14) {
self.cells[13] = self.cells[14];
}
Ok(&self.cells[..self.cell_count as usize])
}
pub fn enable_balancing<I2C>(&mut self, i2c: &mut I2C, cells: u8) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
self.write_raw(i2c, 0x01, &[cells])
}
pub fn balancing_state<I2C>(&mut self, i2c: &mut I2C) -> Result<u8, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut data = [0u8; 1];
self.read_raw(i2c, 0x01, &mut data)?;
Ok(data[0])
}
pub fn current<I2C>(&mut self, i2c: &mut I2C) -> Result<MilliAmperes, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut cc = [0u8; 2];
self.read_raw(i2c, 0x32, &mut cc)?;
let cc = i16::from_be_bytes(cc);
let vshunt = cc as i32 * 8440;
let current = vshunt / self.shunt.0 as i32;
Ok(MilliAmperes(current))
}
pub fn voltage<I2C>(&mut self, i2c: &mut I2C) -> Result<MilliVolts, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut vv = [0u8; 2];
self.read_raw(i2c, 0x2a, &mut vv)?;
let vv = u16::from_be_bytes(vv);
let voltage = 4 * (self.adc_gain as i32) * (vv as i32) + 5 * (self.adc_offset as i32) * 1000;
Ok(MilliVolts((voltage / 1000) as u32))
}
pub fn temperature<I2C>(&mut self, i2c: &mut I2C) -> Result<Temperature, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut ts = [0u8; 2];
self.read_raw(i2c, 0x2c, &mut ts)?;
let ts = u16::from_be_bytes(ts);
let vtsx = (ts as i32) * 382;
match self.temperature_source(i2c)? {
TemperatureSource::InternalDie => {
Ok(Temperature::InternalDie(DegreesCentigrade(vtsx)))
}
TemperatureSource::ExternalThermistor => {
Ok(Temperature::ExternalThermistor(DegreesCentigrade(vtsx)))
}
}
}
pub fn sys_stat<I2C>(&mut self, i2c: &mut I2C) -> Result<Stat, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut data = [0u8; 1];
self.read_raw(i2c, 0x00, &mut data)?;
Ok(Stat{ bits: data[0] })
}
pub fn sys_stat_reset<I2C>(&mut self, i2c: &mut I2C, flags: SysStat) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
self.write_raw(i2c, 0x00, &[flags.bits()])
}
pub fn discharge<I2C>(&mut self, i2c: &mut I2C, enable: bool) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut sys_ctrl2 = [0u8; 1];
self.read_raw(i2c, 0x05, &mut sys_ctrl2)?;
let already_enabled = sys_ctrl2[0] & 0b0000_0010 != 0;
if enable == already_enabled {
return Ok(())
}
if enable {
sys_ctrl2[0] = sys_ctrl2[0] | 0b0000_0010;
} else {
sys_ctrl2[0] = sys_ctrl2[0] & !0b0000_0010;
}
self.write_raw(i2c, 0x05, &sys_ctrl2)
}
pub fn charge<I2C>(&mut self, i2c: &mut I2C, enable: bool) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut sys_ctrl2 = [0u8; 1];
self.read_raw(i2c, 0x05, &mut sys_ctrl2)?;
let already_enabled = sys_ctrl2[0] & 0b0000_0001 != 0;
if enable == already_enabled {
return Ok(())
}
if enable {
sys_ctrl2[0] = sys_ctrl2[0] | 0b0000_0001;
} else {
sys_ctrl2[0] = sys_ctrl2[0] & !0b0000_0001;
}
self.write_raw(i2c, 0x05, &sys_ctrl2)
}
pub fn is_charge_enabled<I2C>(&mut self, i2c: &mut I2C) -> Result<bool, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut sys_ctrl2 = [0u8; 1];
self.read_raw(i2c, 0x05, &mut sys_ctrl2)?;
Ok(sys_ctrl2[0] & 0b0000_0001 != 0)
}
pub fn ship_enter<I2C>(&mut self, i2c: &mut I2C) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
self.write_raw(i2c, 0x04, &[0b0000_0000])?;
self.write_raw(i2c, 0x04, &[0b0000_0001])?;
self.write_raw(i2c, 0x04, &[0b0000_0010])?;
Ok(())
}
fn adc_transfer_function(&self) -> AdcTransferFunction {
AdcTransferFunction {
gain: self.adc_gain,
offset: self.adc_offset
}
}
fn ov_voltage_range(&self) -> (MilliVolts, MilliVolts) {
let min_adc_reading = 0b10_0000_0000_1000;
let max_adc_reading = 0b10_1111_1111_1000;
(self.adc_transfer_function().apply(min_adc_reading), self.adc_transfer_function().apply(max_adc_reading))
}
fn uv_voltage_range(&self) -> (MilliVolts, MilliVolts) {
let min_adc_reading = 0b01_0000_0000_0000;
let max_adc_reading = 0b01_1111_1111_0000;
(self.adc_transfer_function().apply(min_adc_reading), self.adc_transfer_function().apply(max_adc_reading))
}
pub fn init<I2C>(&mut self, i2c: &mut I2C, config: &Config) -> Result<CalculatedValues, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
self.read_adc_characteristics(i2c)?;
let scd_threshold = SCDThreshold::from_current(config.scd_threshold, config.shunt);
let ocd_threshold = OCDThreshold::from_current(config.ocd_threshold, config.shunt);
let scd_range = scd_threshold.range();
let ocd_range = ocd_threshold.range();
if (scd_range == OCDSCDRange::Lower && ocd_range == OCDSCDRange::Upper) ||
(scd_range == OCDSCDRange::Upper && ocd_range == OCDSCDRange::Lower) {
return Err(Error::OCDSCDRangeMismatch);
}
let range_to_use = if scd_range == OCDSCDRange::Unknown {
if ocd_range == OCDSCDRange::Unknown {
OCDSCDRange::Lower
} else {
ocd_range
}
} else if ocd_range == OCDSCDRange::Unknown {
if scd_range == OCDSCDRange::Unknown {
OCDSCDRange::Lower
} else {
scd_range
}
} else {
ocd_range
};
let scd_bits = scd_threshold.bits(range_to_use.clone());
let ocd_bits = ocd_threshold.bits(range_to_use.clone());
let mut regs = [0u8; 6];
regs[0] = range_to_use.bits() | config.scd_delay.bits() | scd_bits;
regs[1] = config.ocd_delay.bits() | ocd_bits;
regs[2] = config.uv_delay.bits() | config.ov_delay.bits();
let ov_limits = self.ov_voltage_range();
if !(config.ov_threshold >= ov_limits.0 && config.ov_threshold <= ov_limits.1) {
return Err(Error::OVThresholdUnobtainable(ov_limits.0, ov_limits.1));
}
let ov_trip_full = ((config.ov_threshold.0 as i32 - self.adc_offset as i32) * 1000) / self.adc_gain as i32;
let ov_bits = (((ov_trip_full as u16) >> 4) & 0xff) as u8;
let uv_limits = self.uv_voltage_range();
if !(config.uv_threshold >= uv_limits.0 && config.uv_threshold <= uv_limits.1) {
return Err(Error::UVThresholdUnobtainable(uv_limits.0, uv_limits.1));
}
let uv_trip_full = ((config.uv_threshold.0 as i32 - self.adc_offset as i32) * 1000) / self.adc_gain as i32;
let uv_bits = (((uv_trip_full as u16) >> 4) & 0xff) as u8;
regs[3] = ov_bits;
regs[4] = uv_bits;
regs[5] = 0x19;
self.write_raw(i2c, 0x06, ®s)?;
self.shunt = config.shunt;
self.init_complete = true;
let mut sysctrl2 = [0u8; 1];
self.read_raw(i2c, 0x05, &mut sysctrl2)?;
sysctrl2[0] = sysctrl2[0] | 0b0100_0000;
self.write_raw(i2c, 0x05, &sysctrl2)?;
Ok(CalculatedValues{
ocdscd_range_used: range_to_use,
scd_threshold: Amperes(((scd_threshold as u32) * 1000) / config.shunt.0),
ocd_threshold: Amperes(((ocd_threshold as u32) * 1000) / config.shunt.0),
uv_threshold: self.adc_transfer_function().apply(0b01_0000_0000_0000 | ((uv_bits as u16) << 4)),
ov_threshold: self.adc_transfer_function().apply(0b10_0000_0000_1000 | ((ov_bits as u16) << 4))
})
}
pub fn enable_adc<I2C>(&mut self, i2c: &mut I2C, enable: bool) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut sysctrl1 = [0u8; 1];
self.read_raw(i2c, 0x04, &mut sysctrl1)?;
sysctrl1[0] = sysctrl1[0] & !(1 << 4);
sysctrl1[0] = sysctrl1[0] | ((enable as u8) << 4);
self.write_raw(i2c, 0x04, &sysctrl1)
}
pub fn set_temperature_source<I2C>(&mut self, i2c: &mut I2C, source: TemperatureSource) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut sysctrl1 = [0u8; 1];
self.read_raw(i2c, 0x04, &mut sysctrl1)?;
sysctrl1[0] = sysctrl1[0] & !(1 << 3);
let is_external = source == TemperatureSource::ExternalThermistor;
sysctrl1[0] = sysctrl1[0] | ((is_external as u8) << 3);
self.write_raw(i2c, 0x04, &sysctrl1)
}
pub fn temperature_source<I2C>(&mut self, i2c: &mut I2C) -> Result<TemperatureSource, Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut sysctrl1 = [0u8; 1];
self.read_raw(i2c, 0x04, &mut sysctrl1)?;
sysctrl1[0] = sysctrl1[0] & !(1 << 3);
let is_external = sysctrl1[0] & (1 << 3) != 0;
if is_external {
Ok(TemperatureSource::ExternalThermistor)
} else {
Ok(TemperatureSource::InternalDie)
}
}
pub fn coulomb_counter_mode<I2C>(&mut self, i2c: &mut I2C, mode: CoulombCounterMode) -> Result<(), Error>
where I2C: embedded_hal::blocking::i2c::Write + embedded_hal::blocking::i2c::WriteRead
{
let mut sysctrl2 = [0u8; 1];
self.read_raw(i2c, 0x05, &mut sysctrl2)?;
sysctrl2[0] = sysctrl2[0] & !0b0110_0000;
match mode {
CoulombCounterMode::Disabled => {},
CoulombCounterMode::OneShot => { sysctrl2[0] = sysctrl2[0] | (1 << 5); }
CoulombCounterMode::Continuous => { sysctrl2[0] = sysctrl2[0] | (1 << 6); }
}
self.write_raw(i2c, 0x05, &sysctrl2)
}
}
#[derive(Copy, Clone)]
struct AdcTransferFunction {
gain: u16,
offset: i8
}
impl AdcTransferFunction {
fn apply(&self, adc_reading: u16) -> MilliVolts {
let adc_reading = adc_reading as i32;
let uv = adc_reading * self.gain as i32 + self.offset as i32 * 1000;
MilliVolts((uv / 1000) as u32)
}
}
pub enum CoulombCounterMode {
Disabled,
OneShot,
Continuous
}
#[derive(Eq, PartialEq, Copy, Clone)]
pub enum TemperatureSource {
InternalDie,
ExternalThermistor
}
#[derive(Eq, PartialEq, Copy, Clone)]
pub enum Temperature {
InternalDie(DegreesCentigrade),
ExternalThermistor(DegreesCentigrade)
}
#[cfg(test)]
mod tests {
extern crate std;
struct DummyI2C {
pub regs: [u8; 255],
}
impl DummyI2C {
pub fn new() -> Self {
let mut regs = [0u8; 255];
regs[0x50] = 0x15;
regs[0x51] = 0x2b;
regs[0x59] = 0xa3;
DummyI2C { regs }
}
}
impl embedded_hal::blocking::i2c::Write for DummyI2C {
type Error = ();
fn write(&mut self, addr: u8, bytes: &[u8]) -> Result<(), Self::Error> {
std::println!("-----------");
std::println!("write: {:#04x}", addr);
let base_reg_addr = bytes[0] as usize;
for (i, b) in bytes.iter().skip(1).enumerate() {
let reg_addr = base_reg_addr + i;
self.regs[reg_addr] = *b;
std::println!("{}/{:#04x}\t<= {:#04x}={:#010b}", reg_addr, reg_addr, *b, *b);
}
Ok(())
}
}
impl embedded_hal::blocking::i2c::WriteRead for DummyI2C {
type Error = ();
fn write_read(&mut self, address: u8, bytes: &[u8], buffer: &mut [u8]) -> Result<(), Self::Error> {
std::println!("----------------");
std::println!("write_read: {:#04x}", address);
let base_reg_addr = bytes[0] as usize;
for (i, b) in buffer.iter_mut().enumerate() {
let reg_addr = base_reg_addr + i;
let reg_value = self.regs[reg_addr];
*b = reg_value;
std::println!("{}/{:#04x}\t== {:#04x}={:#010b}", reg_addr, reg_addr, reg_value, reg_value);
}
Ok(())
}
}
#[test]
fn it_works() {
use crate::*;
let mut i2c = DummyI2C::new();
let mut bq769x0 = BQ769x0::new(0x08);
let config = Config {
shunt: MicroOhms(667),
scd_delay: SCDDelay::_400uS,
scd_threshold: Amperes(200),
ocd_delay: OCDDelay::_1280ms,
ocd_threshold: Amperes(100),
uv_delay: UVDelay::_4s,
uv_threshold: MilliVolts(2000),
ov_delay: OVDelay::_4s,
ov_threshold: MilliVolts(4175)
};
match bq769x0.init(&mut i2c, &config) {
Ok(actual) => {
std::println!("bq769x0 init ok");
std::println!("adc gain:{}uV/LSB offset:{}mV", bq769x0.adc_gain(), bq769x0.adc_offset());
std::println!("SCD: {}, OCD: {}, range: {:?}", actual.scd_threshold, actual.ocd_threshold, actual.ocdscd_range_used);
std::println!("UV: {}, OV: {}", actual.uv_threshold, actual.ov_threshold);
}
Err(e) => {
std::println!("bq769x0 init err: {:?}", e);
}
}
}
}