forked from M-Labs/thermostat
Don't load REF pin of MAX1968 chip on HWRevs < 3.0
The REF pin of the MAX1968 on hardware revisions v2.x is missing a buffer, loading the pin on every CPU ADC read. Avoid reading from it and leave the pin floating on affected hardware revisions, and return the nominal 1.5V instead.
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76547be90a
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09be55e12a
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@ -18,7 +18,7 @@ use crate::{
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channel_state::ChannelState,
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command_parser::{CenterPoint, PwmPin},
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command_handler::JsonBuffer,
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pins,
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pins::{self, Channel0VRef, Channel1VRef},
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steinhart_hart,
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hw_rev,
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};
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@ -203,20 +203,30 @@ impl<'a> Channels<'a> {
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pub fn read_vref(&mut self, channel: usize) -> ElectricPotential {
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match channel {
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0 => {
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let sample = self.pins_adc.convert(
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&self.channel0.vref_pin,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480
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);
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let mv = self.pins_adc.sample_to_millivolts(sample);
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ElectricPotential::new::<millivolt>(mv as f64)
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match &self.channel0.vref_pin {
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Channel0VRef::Analog(vref_pin) => {
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let sample = self.pins_adc.convert(
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vref_pin,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480
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);
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let mv = self.pins_adc.sample_to_millivolts(sample);
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ElectricPotential::new::<millivolt>(mv as f64)
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},
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Channel0VRef::Disabled(_) => ElectricPotential::new::<volt>(1.5)
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}
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}
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1 => {
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let sample = self.pins_adc.convert(
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&self.channel1.vref_pin,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480
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);
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let mv = self.pins_adc.sample_to_millivolts(sample);
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ElectricPotential::new::<millivolt>(mv as f64)
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match &self.channel1.vref_pin {
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Channel1VRef::Analog(vref_pin) => {
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let sample = self.pins_adc.convert(
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vref_pin,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480
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);
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let mv = self.pins_adc.sample_to_millivolts(sample);
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ElectricPotential::new::<millivolt>(mv as f64)
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},
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Channel1VRef::Disabled(_) => ElectricPotential::new::<volt>(1.5)
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}
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}
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_ => unreachable!(),
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}
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26
src/pins.rs
26
src/pins.rs
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@ -66,21 +66,31 @@ pub trait ChannelPins {
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type TecUMeasPin;
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}
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pub enum Channel0VRef {
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Analog(PA0<Analog>),
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Disabled(PA0<Input<Floating>>),
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}
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impl ChannelPins for Channel0 {
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type DacSpi = Dac0Spi;
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type DacSync = PE4<Output<PushPull>>;
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type Shdn = PE10<Output<PushPull>>;
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type VRefPin = PA0<Analog>;
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type VRefPin = Channel0VRef;
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type ItecPin = PA6<Analog>;
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type DacFeedbackPin = PA4<Analog>;
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type TecUMeasPin = PC2<Analog>;
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}
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pub enum Channel1VRef {
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Analog(PA3<Analog>),
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Disabled(PA3<Input<Floating>>),
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}
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impl ChannelPins for Channel1 {
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type DacSpi = Dac1Spi;
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type DacSync = PF6<Output<PushPull>>;
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type Shdn = PE15<Output<PushPull>>;
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type VRefPin = PA3<Analog>;
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type VRefPin = Channel1VRef;
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type ItecPin = PB0<Analog>;
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type DacFeedbackPin = PA5<Analog>;
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type TecUMeasPin = PC3<Analog>;
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@ -150,13 +160,17 @@ impl Pins {
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gpioe.pe13, gpioe.pe14
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);
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let hwrev = HWRev::detect_hw_rev(&HWRevPins {hwrev0: gpiod.pd0, hwrev1: gpiod.pd1,
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hwrev2: gpiod.pd2, hwrev3: gpiod.pd3});
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let hw_settings = hwrev.settings();
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let (dac0_spi, dac0_sync) = Self::setup_dac0(
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clocks, spi4,
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gpioe.pe2, gpioe.pe4, gpioe.pe6
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);
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let mut shdn0 = gpioe.pe10.into_push_pull_output();
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let _ = shdn0.set_low();
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let vref0_pin = gpioa.pa0.into_analog();
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let vref0_pin = if hwrev.major > 2 {Channel0VRef::Analog(gpioa.pa0.into_analog())} else {Channel0VRef::Disabled(gpioa.pa0)};
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let itec0_pin = gpioa.pa6.into_analog();
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let dac_feedback0_pin = gpioa.pa4.into_analog();
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let tec_u_meas0_pin = gpioc.pc2.into_analog();
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@ -176,7 +190,7 @@ impl Pins {
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);
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let mut shdn1 = gpioe.pe15.into_push_pull_output();
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let _ = shdn1.set_low();
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let vref1_pin = gpioa.pa3.into_analog();
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let vref1_pin = if hwrev.major > 2 {Channel1VRef::Analog(gpioa.pa3.into_analog())} else {Channel1VRef::Disabled(gpioa.pa3)};
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let itec1_pin = gpiob.pb0.into_analog();
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let dac_feedback1_pin = gpioa.pa5.into_analog();
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let tec_u_meas1_pin = gpioc.pc3.into_analog();
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@ -198,10 +212,6 @@ impl Pins {
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channel1,
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};
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let hwrev = HWRev::detect_hw_rev(&HWRevPins {hwrev0: gpiod.pd0, hwrev1: gpiod.pd1,
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hwrev2: gpiod.pd2, hwrev3: gpiod.pd3});
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let hw_settings = hwrev.settings();
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let leds = Leds::new(gpiod.pd9, gpiod.pd10.into_push_pull_output(), gpiod.pd11.into_push_pull_output());
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let eeprom_scl = gpiob.pb8.into_alternate().set_open_drain();
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