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#![no_std]
#![deny(missing_docs)]
#![deny(unsafe_code)]
use embedded_hal::blocking::i2c::{Write, WriteRead};
use bit_field::BitField;
mod adc;
mod ldo;
mod regs;
mod units;
use units::*;
use regs::*;
pub use adc::AdcSettings;
pub use ldo::{Ldo, LdoKind};
pub use regs::{AdcSampleRate, ChargingCurrent, ChargingVoltage, TsPinMode};
use cortex_m_semihosting::hprintln;
const AXP173_ADDR: u8 = 0x68;
const AXP173_ON_CHIP_BUFFER_DEFAULT: [u8; 6] = [0xf0, 0x0f, 0x00, 0xff, 0x00, 0x00];
type Axp173Result<T, E> = Result<T, Error<E>>;
type OperationResult<E> = Axp173Result<(), E>;
#[derive(Debug)]
pub enum Error<E> {
I2c(E),
InvalidChip([u8; 6]),
}
pub struct Axp173<I> {
i2c: I,
}
impl<I, E> Axp173<I>
where
I: WriteRead<Error = E> + Write<Error = E>,
{
pub fn new(i2c: I) -> Self {
Axp173 { i2c }
}
pub fn init(&mut self) -> OperationResult<E> {
self.read_u8(POWER_DATA_BUFFER1).map_err(Error::I2c)?;
let buf = self.read_onchip_buffer()?;
match buf {
AXP173_ON_CHIP_BUFFER_DEFAULT => Ok(()),
_ => Err(Error::InvalidChip(buf)),
}
}
pub fn read_onchip_buffer(&mut self) -> Axp173Result<[u8; 6], E> {
let mut buf = [0u8; 6];
self.read_bytes(POWER_DATA_BUFFER1, &mut buf)
.map_err(Error::I2c)?;
Ok(buf)
}
#[allow(clippy::trivially_copy_pass_by_ref)]
pub fn write_onchip_buffer(&mut self, bytes: &[u8; 6]) -> OperationResult<E> {
let mut buf = [0u8; 6 + 1];
buf[0] = POWER_DATA_BUFFER1;
for (i, byte) in bytes.iter().enumerate() {
buf[i + 1] = *byte;
}
self.i2c.write(AXP173_ADDR, &buf[..]).map_err(Error::I2c)?;
Ok(())
}
pub fn vbus_present(&mut self) -> Axp173Result<bool, E> {
let reg_val = self.read_u8(POWER_STATUS).map_err(Error::I2c)?;
Ok(reg_val.get_bit(POWER_STATUS_VBUS_PRESENT))
}
pub fn battery_present(&mut self) -> Axp173Result<bool, E> {
let reg_val = self.read_u8(POWER_MODE_CHGSTATUS).map_err(Error::I2c)?;
Ok(reg_val.get_bit(POWER_MODE_CHGSTATUS_BATTERY_PRESENT))
}
pub fn battery_charging(&mut self) -> Axp173Result<bool, E> {
let reg_val = self.read_u8(POWER_MODE_CHGSTATUS).map_err(Error::I2c)?;
Ok(reg_val.get_bit(POWER_MODE_CHGSTATUS_IS_CHARGING))
}
pub fn enable_ldo(&mut self, ldo: &Ldo) -> OperationResult<E> {
self.set_ldo_voltage(&ldo)?;
self.switch_ldo(&ldo.kind, true)
}
pub fn disable_ldo(&mut self, ldo: &LdoKind) -> OperationResult<E> {
self.switch_ldo(ldo, false)
}
fn switch_ldo(&mut self, ldo: &LdoKind, enable: bool) -> OperationResult<E> {
let bit = match ldo {
LdoKind::LDO2 => POWER_ON_OFF_REG_LDO2_ON,
LdoKind::LDO3 => POWER_ON_OFF_REG_LDO3_ON,
LdoKind::LDO4 => POWER_ON_OFF_REG_LDO4_ON,
};
let mut bits = self.read_u8(POWER_ON_OFF_REG).map_err(Error::I2c)?;
bits.set_bit(bit, enable);
self.write_u8(POWER_ON_OFF_REG, bits).map_err(Error::I2c)?;
Ok(())
}
fn set_ldo_voltage(&mut self, ldo: &Ldo) -> OperationResult<E> {
let reg = match &ldo.kind {
LdoKind::LDO2 | LdoKind::LDO3 => LDO2_LDO3_OUT_VOL_REG,
LdoKind::LDO4 => LDO4_OUT_VOL_REG,
};
let voltage = ldo.voltage;
let mut bits = self.read_u8(reg).map_err(Error::I2c)?;
let bits_range = match &ldo.kind {
LdoKind::LDO2 => 4..8,
LdoKind::LDO3 => 0..4,
LdoKind::LDO4 => 0..7,
};
bits.set_bits(bits_range, voltage);
self.write_u8(reg, bits).map_err(Error::I2c)?;
Ok(())
}
pub fn set_charging_current(&mut self, current: ChargingCurrent) -> OperationResult<E> {
let mut bits = self.read_u8(POWER_CHARGE1).map_err(Error::I2c)?;
bits.set_bits(POWER_CHARGE1_CURRENT_SETTING, current.bits());
self.write_u8(POWER_CHARGE1, bits).map_err(Error::I2c)?;
Ok(())
}
pub fn set_charging_voltage(&mut self, voltage: ChargingVoltage) -> OperationResult<E> {
let mut bits = self.read_u8(POWER_CHARGE1).map_err(Error::I2c)?;
bits.set_bits(POWER_CHARGE1_VOLTAGE_SETTING, voltage.bits());
self.write_u8(POWER_CHARGE1, bits).map_err(Error::I2c)?;
Ok(())
}
pub fn set_charging(&mut self, enabled: bool) -> OperationResult<E> {
let mut bits = self.read_u8(POWER_CHARGE1).map_err(Error::I2c)?;
bits.set_bit(POWER_CHARGE1_ENABLE_CHARGING, enabled);
self.write_u8(POWER_CHARGE1, bits).map_err(Error::I2c)?;
Ok(())
}
pub fn set_adc_settings(&mut self, adc_settings: &AdcSettings) -> OperationResult<E> {
let mut bits = self.read_u8(POWER_ADC_EN1).map_err(Error::I2c)?;
adc_settings.write_adc_en_bits(&mut bits);
self.write_u8(POWER_ADC_EN1, bits).map_err(Error::I2c)?;
let mut bits = self.read_u8(POWER_ADC_SPEED_TS).map_err(Error::I2c)?;
adc_settings.write_adc_sample_rate_and_ts_bits(&mut bits);
self.write_u8(POWER_ADC_SPEED_TS, bits)
.map_err(Error::I2c)?;
Ok(())
}
pub fn vbus_voltage(&mut self) -> Axp173Result<Voltage, E> {
let res = self.read_u12(POWER_VBUS_VOL_H8).map_err(Error::I2c)?;
Ok(Voltage::new(res, VBUS_VOLTAGE_COEFF))
}
pub fn vbus_current(&mut self) -> Axp173Result<Current, E> {
let res = self.read_u13(POWER_VBUS_CUR_H8).map_err(Error::I2c)?;
Ok(Current::new(res, VBUS_CURRENT_COEFF, VBUS_CURRENT_DIV))
}
pub fn batt_voltage(&mut self) -> Axp173Result<Voltage, E> {
let res = self.read_u12(POWER_BAT_AVERVOL_H8).map_err(Error::I2c)?;
Ok(Voltage::new(res, BATT_VOLTAGE_COEFF))
}
pub fn batt_charge_current(&mut self) -> Axp173Result<Current, E> {
let res = self.read_u13(POWER_BAT_AVERCHGCUR_H8).map_err(Error::I2c)?;
Ok(Current::new(res, BATT_CURRENT_COEFF, BATT_CURRENT_DIV))
}
pub fn batt_discharge_current(&mut self) -> Axp173Result<Current, E> {
let res = self.read_u13(POWER_BAT_AVERDISCHGCUR_H8).map_err(Error::I2c)?;
Ok(Current::new(res, BATT_CURRENT_COEFF, BATT_CURRENT_DIV))
}
fn read_u12(&mut self, msb_reg: u8) -> Result<u16, E> {
let msb = self.read_u8(msb_reg)? as u16;
let lsb = self.read_u8(msb_reg + 1)? as u16 & 0b1111;
Ok(msb << 4 | lsb)
}
fn read_u13(&mut self, msb_reg: u8) -> Result<u16, E> {
let msb = self.read_u8(msb_reg)? as u16;
let lsb = self.read_u8(msb_reg + 1)? as u16 & 0b11111;
Ok(msb << 5 | lsb)
}
fn read_u8(&mut self, reg: u8) -> Result<u8, E> {
let mut byte: [u8; 1] = [0; 1];
match self.i2c.write_read(AXP173_ADDR, &[reg], &mut byte) {
Ok(_) => Ok(byte[0]),
Err(e) => Err(e),
}
}
fn read_bytes(&mut self, reg: u8, buf: &mut [u8]) -> Result<(), E> {
self.i2c.write_read(AXP173_ADDR, &[reg], buf)
}
fn write_u8(&mut self, reg: u8, value: u8) -> Result<(), E> {
self.i2c.write(AXP173_ADDR, &[reg, value])?;
Ok(())
}
}