285 lines
9.2 KiB
Rust
285 lines
9.2 KiB
Rust
use core::u16;
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use crate::thermostat::ad5680;
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use fugit::RateExtU32;
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use stm32f4xx_hal::{
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adc::{
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config::{self, AdcConfig},
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Adc,
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},
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gpio::{gpioa::*, gpiob::*, gpioc::*, Alternate, Analog, Output, PushPull},
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hal,
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pac::{ADC1, SPI1, TIM4},
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rcc::Clocks,
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spi::{NoMiso, Spi, TransferModeNormal},
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timer::pwm::{PwmChannel, PwmExt},
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};
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use uom::si::{
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electric_current::ampere,
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electric_potential::{millivolt, volt},
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electrical_resistance::ohm,
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f64::{ElectricCurrent, ElectricPotential, ElectricalResistance},
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ratio::ratio,
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};
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pub const PWM_FREQ_KHZ: u32 = 20;
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pub const R_SENSE: f64 = 0.05;
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// Rev 0_2: DAC Chip connects 3V3 reference voltage and thus provide 0-3.3V output range
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// TODO: Rev 0_3: DAC Chip connects 3V3 reference voltage,
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// which is then passed through a resistor divider to provide 0-3V output range
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const DAC_OUT_V_MAX: f64 = 3.3;
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const TEC_VSEC_BIAS_V: f64 = 1.65;
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const MAX_V_DUTY_MAX: f64 = 1.5 / 3.3;
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const MAX_I_POS_DUTY_MAX: f64 = 1.5 / 3.3;
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const MAX_I_NEG_DUTY_MAX: f64 = 1.5 / 3.3;
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pub struct MAX1968PinSet {
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pub dac_spi: DacSpi,
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pub dac_sync: DacSync,
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pub shdn: PA5<Output<PushPull>>,
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pub dac_vfb: PC0<Analog>,
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pub vref: PA6<Analog>,
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pub vtec: PB0<Analog>,
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pub itec: PB1<Analog>,
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pub max_v0: PwmChannel<TIM4, 1>,
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pub max_i_pos0: PwmChannel<TIM4, 2>,
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pub max_i_neg0: PwmChannel<TIM4, 0>,
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}
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type DacSpi = Spi<SPI1, (PB3<Alternate<5>>, NoMiso, PB5<Alternate<5>>), TransferModeNormal>;
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type DacSync = PB4<Output<PushPull>>;
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pub struct MaxAdcPins {
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pub dac_vfb: PC0<Analog>,
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pub vref: PA6<Analog>,
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pub itec: PB1<Analog>,
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pub vtec: PB0<Analog>,
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}
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pub struct MAX1968 {
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pub center_pt: ElectricPotential, // To be moved to a miniconf crate's struct
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pub adc: Adc<ADC1>,
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pub dac: ad5680::Dac<DacSpi, DacSync>,
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pub shdn: PA5<Output<PushPull>>,
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pub adc_pins: MaxAdcPins,
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pub pwm_pins: PwmPins,
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}
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pub struct PwmPins {
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pub max_v0: PwmChannel<TIM4, 1>,
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pub max_i_pos0: PwmChannel<TIM4, 2>,
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pub max_i_neg0: PwmChannel<TIM4, 0>,
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}
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enum PwmPinsEnum {
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MaxV,
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MaxPosI,
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MaxNegI,
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}
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pub enum AdcReadTarget {
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VREF,
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DacVfb,
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ITec,
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VTec,
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}
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impl PwmPins {
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fn setup(clocks: Clocks, tim4: TIM4, max_v0: PB7, max_i_pos0: PB8, max_i_neg0: PB6) -> PwmPins {
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let freq = 20.kHz();
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fn init_pwm_pin<P: hal::PwmPin<Duty = u16>>(pin: &mut P) {
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pin.set_duty(0);
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pin.enable();
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}
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let channels = (
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max_i_neg0.into_alternate::<2>(),
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max_v0.into_alternate::<2>(),
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max_i_pos0.into_alternate::<2>(),
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);
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let (mut max_i_neg0, mut max_v0, mut max_i_pos0) =
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tim4.pwm_hz(channels, freq, &clocks).split();
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init_pwm_pin(&mut max_v0);
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init_pwm_pin(&mut max_i_neg0);
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init_pwm_pin(&mut max_i_pos0);
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PwmPins {
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max_v0,
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max_i_pos0,
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max_i_neg0,
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}
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}
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}
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impl MAX1968 {
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pub fn new(pins: MAX1968PinSet, adc1: ADC1) -> Self {
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let dac = ad5680::Dac::new(pins.dac_spi, pins.dac_sync);
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let config = AdcConfig::default()
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.clock(config::Clock::Pclk2_div_2)
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.default_sample_time(config::SampleTime::Cycles_480);
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let pins_adc = Adc::adc1(adc1, true, config);
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MAX1968 {
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center_pt: ElectricPotential::new::<millivolt>(1500.0),
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adc: pins_adc,
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dac: dac,
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shdn: pins.shdn,
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adc_pins: MaxAdcPins {
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dac_vfb: pins.dac_vfb,
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vref: pins.vref,
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itec: pins.itec,
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vtec: pins.vtec,
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},
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pwm_pins: PwmPins {
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max_v0: pins.max_v0,
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max_i_pos0: pins.max_i_pos0,
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max_i_neg0: pins.max_i_neg0,
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},
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}
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}
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pub fn power_down(&mut self) {
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let _ = self.shdn.set_low();
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}
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pub fn power_up(&mut self) {
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let _ = self.shdn.set_high();
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}
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pub fn set_center_point(&mut self, value: ElectricPotential) {
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self.center_pt = value;
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}
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fn set_dac(&mut self, voltage: ElectricPotential) -> ElectricPotential {
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let value = ((voltage / ElectricPotential::new::<volt>(DAC_OUT_V_MAX)).get::<ratio>()
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* (ad5680::MAX_VALUE as f64)) as u32;
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self.dac.set(value).unwrap();
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// TODO: Store the set-ed DAC Voltage Value
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voltage
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}
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pub fn set_i(&mut self, i_tec: ElectricCurrent) -> ElectricCurrent {
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let center_point = self.center_pt;
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let r_sense = ElectricalResistance::new::<ohm>(R_SENSE);
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let voltage = i_tec * 10.0 * r_sense + center_point;
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let voltage = self.set_dac(voltage);
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let i_tec = (voltage - center_point) / (10.0 * r_sense);
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i_tec
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}
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// AN4073: ADC Reading Dispersion can be reduced through Averaging
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// Upon test, 16 Point Averaging = +-3 LSB Dispersion
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fn adc_read(&mut self, adc_read_target: AdcReadTarget, avg_pt: u16) -> ElectricPotential {
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let mut sample: u32 = 0;
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sample = match adc_read_target {
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AdcReadTarget::VREF => {
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for _ in (0..avg_pt).rev() {
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sample += self.adc.convert(
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&self.adc_pins.vref,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480,
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) as u32;
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}
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sample / avg_pt as u32
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}
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AdcReadTarget::DacVfb => {
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for _ in (0..avg_pt).rev() {
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sample += self.adc.convert(
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&self.adc_pins.dac_vfb,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480,
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) as u32;
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}
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sample / avg_pt as u32
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}
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AdcReadTarget::ITec => {
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for _ in (0..avg_pt).rev() {
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sample += self.adc.convert(
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&self.adc_pins.itec,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480,
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) as u32;
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}
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sample / avg_pt as u32
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}
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AdcReadTarget::VTec => {
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for _ in (0..avg_pt).rev() {
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sample += self.adc.convert(
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&self.adc_pins.vtec,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480,
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) as u32;
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}
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sample / avg_pt as u32
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}
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};
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let mv = self.adc.sample_to_millivolts(sample as u16);
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ElectricPotential::new::<millivolt>(mv as f64)
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}
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pub fn get_vref(&mut self) -> ElectricPotential {
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self.adc_read(AdcReadTarget::VREF, 16)
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}
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pub fn get_dac_vfb(&mut self) -> ElectricPotential {
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// Fixme: Rev0_2 does not have this feature
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unimplemented!()
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//self.adc_read(AdcReadTarget:: DacVfb, 1)
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}
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pub fn get_tec_i(&mut self) -> ElectricCurrent {
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(self.adc_read(AdcReadTarget::ITec, 1) - self.center_pt)
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/ ElectricalResistance::new::<ohm>(0.4)
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}
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pub fn get_tec_v(&mut self) -> ElectricPotential {
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// Fixme: Rev0_2 has Analog Input Polarity Reversed
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// Remove the -ve sign for Rev0_3
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-(self.adc_read(AdcReadTarget::VTec, 1) - ElectricPotential::new::<volt>(TEC_VSEC_BIAS_V))
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* 4.0
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}
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fn set_pwm(&mut self, pwm_pin: PwmPinsEnum, duty: f64, max_duty: f64) -> f64 {
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fn set<P: hal::PwmPin<Duty = u16>>(pin: &mut P, duty: f64) -> f64 {
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let max = pin.get_max_duty();
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let value = ((duty * (max as f64)) as u16).min(max);
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pin.set_duty(value);
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pin.enable();
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value as f64 / (max as f64)
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}
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let duty = duty.min(max_duty);
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match pwm_pin {
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PwmPinsEnum::MaxV => set(&mut self.pwm_pins.max_v0, duty),
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PwmPinsEnum::MaxPosI => set(&mut self.pwm_pins.max_i_pos0, duty),
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PwmPinsEnum::MaxNegI => set(&mut self.pwm_pins.max_i_neg0, duty),
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}
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}
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pub fn set_max_v(&mut self, max_v: ElectricPotential) -> (ElectricPotential, ElectricPotential) {
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let max = ElectricPotential::new::<volt>(6.0);
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let v = max_v / 4.0;
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let duty = (v / ElectricPotential::new::<volt>(3.3)).get::<ratio>();
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let duty = self.set_pwm(PwmPinsEnum::MaxV, duty, MAX_V_DUTY_MAX);
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(duty * max, max)
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}
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pub fn set_max_i_pos(&mut self, max_i_pos: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
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let max = ElectricCurrent::new::<ampere>(3.0);
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let v = 10.0 * max_i_pos * ElectricalResistance::new::<ohm>(R_SENSE);
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let duty = (v / ElectricPotential::new::<volt>(3.3)).get::<ratio>();
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let duty = self.set_pwm(PwmPinsEnum::MaxPosI, duty, MAX_I_POS_DUTY_MAX);
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(duty * max * 3.3 / 1.5, max)
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}
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pub fn set_max_i_neg(&mut self, max_i_neg: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
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let max = ElectricCurrent::new::<ampere>(3.0);
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let v = 10.0 * max_i_neg * ElectricalResistance::new::<ohm>(R_SENSE);
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let duty = (v / ElectricPotential::new::<volt>(3.3)).get::<ratio>();
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let duty = self.set_pwm(PwmPinsEnum::MaxNegI, duty, MAX_I_NEG_DUTY_MAX);
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(duty * max * 3.3 / 1.5, max)
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}
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}
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