thermostat/src/channels.rs

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use stm32f4xx_hal::hal::digital::v2::OutputPin;
use smoltcp::time::Instant;
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use crate::{
ad7172,
channel::{Channel, Channel0, Channel1},
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channel_state::ChannelState,
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pins,
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units::Volts,
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};
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pub const CHANNELS: usize = 2;
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pub struct Channels {
pub channel0: Channel<Channel0>,
pub channel1: Channel<Channel1>,
pub adc: ad7172::Adc<pins::AdcSpi, pins::AdcNss>,
pub pwm: pins::PwmPins,
}
impl Channels {
pub fn new(pins: pins::Pins) -> Self {
let channel0 = Channel::new(pins.channel0);
let channel1 = Channel::new(pins.channel1);
let pwm = pins.pwm;
let mut adc = ad7172::Adc::new(pins.adc_spi, pins.adc_nss).unwrap();
// Feature not used
adc.set_sync_enable(false).unwrap();
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// Calibrate ADC channels individually
adc.disable_all_channels().unwrap();
adc.setup_channel(0, ad7172::Input::Ain0, ad7172::Input::Ain1).unwrap();
adc.calibrate().unwrap();
adc.disable_channel(0).unwrap();
adc.setup_channel(1, ad7172::Input::Ain2, ad7172::Input::Ain3).unwrap();
adc.calibrate().unwrap();
adc.disable_channel(1).unwrap();
// Setup channels and start ADC
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adc.setup_channel(0, ad7172::Input::Ain0, ad7172::Input::Ain1).unwrap();
adc.setup_channel(1, ad7172::Input::Ain2, ad7172::Input::Ain3).unwrap();
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adc.start_continuous_conversion().unwrap();
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Channels { channel0, channel1, adc, pwm }
}
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pub fn channel_state<I: Into<usize>>(&mut self, channel: I) -> &mut ChannelState {
match channel.into() {
0 => &mut self.channel0.state,
1 => &mut self.channel1.state,
_ => unreachable!(),
}
}
/// ADC input + PID processing
pub fn poll_adc(&mut self, instant: Instant) -> Option<u8> {
self.adc.data_ready().unwrap().map(|channel| {
let data = self.adc.read_data().unwrap();
let dac_value = {
let state = self.channel_state(channel);
let pid_output = state.update_pid(instant, data);
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if state.pid_engaged {
Some(pid_output)
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} else {
None
}
};
if let Some(dac_value) = dac_value {
// Forward PID output to i_set DAC
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self.set_dac(channel.into(), Volts(dac_value));
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}
channel
})
}
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/// i_set DAC
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pub fn set_dac(&mut self, channel: usize, voltage: Volts) {
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match channel {
0 => {
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self.channel0.dac.set(voltage).unwrap();
self.channel0.state.dac_value = voltage;
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self.channel0.shdn.set_high().unwrap();
}
1 => {
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self.channel1.dac.set(voltage).unwrap();
self.channel1.state.dac_value = voltage;
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self.channel1.shdn.set_high().unwrap();
}
_ => unreachable!(),
}
}
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pub fn read_dac_feedback(&mut self, channel: usize) -> Volts {
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match channel {
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0 => {
let sample = self.channel0.adc.convert(
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&self.channel0.dac_feedback_pin,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480
);
let mv = self.channel0.adc.sample_to_millivolts(sample);
Volts(mv as f64 / 1000.0)
}
1 => {
let sample = self.channel1.adc.convert(
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&self.channel1.dac_feedback_pin,
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stm32f4xx_hal::adc::config::SampleTime::Cycles_480
);
let mv = self.channel1.adc.sample_to_millivolts(sample);
Volts(mv as f64 / 1000.0)
}
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_ => unreachable!(),
}
}
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pub fn read_itec(&mut self, channel: usize) -> Volts {
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match channel {
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0 => {
let sample = self.channel0.adc.convert(
&self.channel0.itec_pin,
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
);
let mv = self.channel0.adc.sample_to_millivolts(sample);
Volts(mv as f64 / 1000.0)
}
1 => {
let sample = self.channel1.adc.convert(
&self.channel1.itec_pin,
stm32f4xx_hal::adc::config::SampleTime::Cycles_480
);
let mv = self.channel1.adc.sample_to_millivolts(sample);
Volts(mv as f64 / 1000.0)
}
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_ => unreachable!(),
}
}
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}