Lib.rs

axp173

What is this?

This is a embedded-hal driver for X-Powers' Power Management IC AXP173.

It's device-agnostic and uses embedded-hal's Write/WriteRead for I2C communication.

Usage

1. Add dependency to Cargo.toml:

   cargo add axp173
   

2. Instantiate and init the device:

   // ... declare and configure your I2c peripheral ...
   
   // Init AXP173 PMIC
   let axp173 = axp173::Axp173::new(i2c);
   axp173.init()?;
   Ok(axp173)
   

3. Configure the PMIC

   // Set charging current to 100mA
   axp173
       .set_charging_current(ChargingCurrent::CURRENT_100MA)?;
   
   // Enable internal ADCs
   // 25Hz sample rate, Disable TS, enable current sensing ADC
   axp173
       .set_adc_settings(
           AdcSettings::default()
               .set_adc_sample_rate(AdcSampleRate::RATE_25HZ)
               .ts_adc(false)
               .set_ts_pin_mode(TsPinMode::SHUT_DOWN)
               .vbus_voltage_adc(true)
               .vbus_current_adc(true)
               .batt_voltage_adc(true)
               .batt_current_adc(true),
       )?;
   
   // Enable battery gas gauge
   axp173.set_coulomb_counter(true)?;
   axp173.resume_coulomb_counter()?;
   
   // Power-off the device after 4 seconds of
   // long press of power button
   axp173.set_shutdown_long_press_time(ShutdownLongPressTime::SEC_4)?;
   
   // Clear pending IRQs and enable some interesting IRQs
   axp173.clear_all_irq()?;
   axp173.set_irq(axp173::Irq::ButtonShortPress, true)?;
   axp173.set_irq(axp173::Irq::BatteryCharged, true)?;
   axp173.set_irq(axp173::Irq::VbusPluggedIn, true)?;
   

4. Handle PMIC IRQs:

   // Inside an IRQ ISR:
   if axp173.check_irq(Irq::ButtonShortPress)? {
       axp173.clear_irq(Irq::ButtonShortPress)?;
       defmt::info!("Button pressed");
   }
   axp173.clear_all_irq()?; // Clear everything else
   

Status

What is done and tested and what is not yet:

• Coulomb counter reading
• Coulomb counter control
• IRQs
• Battery voltage & current readings
• VBUS voltage & current readings
• AXP173 on-chip buffer
  • Reading
  • Checking default values
  • Writing
• AXP173 LDO2, LDO3, LDO4 enable/disable
• LDO voltage setup
• VBUS presence
• Battery presence
• Battery charging status
• Charging current setup
• Charging regulated voltage setup
• Internal ADC settings:
  • Sample rate
  • Enable/Disable various ADC channels (batt. voltage, current, etc.)
• Button settings
• DC/DC settings
• Temperature sensor readings
• Instantaneous battery power reading