ld_drive: add unit type and hw related constant

src/device/boot.rs

@@ -1,6 +1,5 @@
 use super::{gpio, sys_timer, usb};
 use crate::laser_diode::current_sources::*;
-use crate::laser_diode::pd_mon::PdMon;
 use crate::thermostat::max1968::{MAX1968};
 use crate::thermostat::thermostat::Thermostat;
 use fugit::ExtU32;
@@ -39,7 +38,7 @@ pub fn bootup(
 
     sys_timer::setup(core_perif.SYST, clocks);
 
-    let (_eth_pins, usb, current_source_phy, pd_mon_phy, max1968_phy) = gpio::setup(
+    let (_eth_pins, usb, current_source_phy, max1968_phy) = gpio::setup(
         clocks,
         perif.TIM4,
         perif.GPIOA,
@@ -56,19 +55,6 @@ pub fn bootup(
 
     usb::State::setup(usb);
 
-    let mut laser = CurrentSource {
-        phy: current_source_phy,
-        setting: CurrentSourceSettings {
-            output_current: 0.0,
-        },
-    };
-
-    laser.setup();
-    laser.set_current(0.1).unwrap();
-
-    let mut pd_mon = PdMon::new(pd_mon_phy, perif.ADC2);
-
-
     let tec_driver = MAX1968::new(max1968_phy, perif.ADC1);
 
     let mut thermostat = Thermostat::new(tec_driver);

src/laser_diode/ld_drive.rs

@@ -1,11 +1,48 @@
 use miniconf::Miniconf;
 use crate::laser_diode::current_sources::CurrentSource;
+use core::marker::PhantomData;
 
 use uom::si::{
     electric_current::{milliampere},
-    f64::ElectricCurrent,
+    f64::{ElectricPotential, ElectricCurrent, ElectricalResistance},
 };
 
+use uom::{si::{ISQ, SI, Quantity}, typenum::*};
+
+// Volt / Ampere
+pub type transimpedance_unit = Quantity<ISQ<P2, P1, N3, N2, Z0, Z0, Z0>, SI<f64>, f64>;
+// Ampere / Volt
+type transconductance_unit = Quantity<ISQ<N2, N1, P3, P2, Z0, Z0, Z0>, SI<f64>, f64>;
+// Watt / Ampere
+pub type i_to_power_unit = Quantity<ISQ<P2, P1, N3, N1, Z0, Z0, Z0>, SI<f64>, f64>; 
+
+impl Settings{
+    pub const R_SENSE: ElectricalResistance = ElectricalResistance {
+        dimension: PhantomData,
+        units: PhantomData,
+        value: 10.0,
+    };
+
+    pub const DAC_OUT_V_MAX: ElectricPotential = ElectricPotential {
+        dimension: PhantomData,
+        units: PhantomData,
+        value: 4.096,
+    };
+
+    // Unit: A/V
+    const PD_MON_TRANSCONDUCTANCE: transconductance_unit = transconductance_unit {
+        dimension: PhantomData,
+        units: PhantomData,
+        value: 0.001,
+    };
+
+    const LD_DRIVE_TRANSIMPEDANCE: transimpedance_unit = transimpedance_unit {
+        dimension: PhantomData,
+        units: PhantomData,
+        value: 10.0 / 0.75,
+    };
+}
+
 #[derive(Clone, Debug, Miniconf)]
 pub struct Settings {
     pub ld_drive_current: ElectricCurrent,