Implement Observable POC

examples/comp.rs

@@ -15,7 +15,7 @@ use rt::entry;
 
 #[entry]
 fn main() -> ! {
-    use hal::comparator::{ComparatorExt, ComparatorSplit, Config, Hysteresis, RefintInput};
+    use hal::comparator::{refint_input, ComparatorExt, ComparatorSplit, Config, Hysteresis};
     use hal::gpio::GpioExt;
     use hal::prelude::OutputPin;
     use hal::rcc::RccExt;
@@ -31,16 +31,16 @@ fn main() -> ! {
 
     let pa1 = gpioa.pa1.into_analog();
     let pa0 = gpioa.pa0.into_analog();
-    let comp1 = comp1.comparator(&pa1, pa0, Config::default(), &rcc.clocks);
+    let comp1 = comp1.comparator(pa1, pa0, Config::default(), &rcc.clocks);
     let comp1 = comp1.enable();
 
     // led1 pa1 will be updated manually when to match comp1 value
     let mut led1 = gpioa.pa5.into_push_pull_output();
 
     let pa7 = gpioa.pa7.into_analog();
     let comp2 = comp2.comparator(
-        &pa7,
-        RefintInput::VRefintM12,
+        pa7,
+        refint_input::VRefintM12,
         Config::default()
             .hysteresis(Hysteresis::None)
             .output_inverted(),

examples/comp_w_dac.rs

@@ -7,6 +7,7 @@ mod utils;
 extern crate cortex_m_rt as rt;
 
 use rt::entry;
+use stm32g4xx_hal::observable::Observable;
 
 #[entry]
 fn main() -> ! {
@@ -30,15 +31,16 @@ fn main() -> ! {
     // Set up DAC to output to pa4 and to internal signal Dac1IntSig1
     // which just so happens is compatible with comp1
     let dac1ch1 = dp.DAC1.constrain((gpioa.pa4, Dac1IntSig1), &mut rcc);
-    let mut dac = dac1ch1.calibrate_buffer(&mut delay).enable();
+    let dac = dac1ch1.calibrate_buffer(&mut delay).enable();
+    let (mut dac, [dac_token]) = dac.observe();
 
     let (comp1, _comp2, ..) = dp.COMP.split(&mut rcc);
     let pa1 = gpioa.pa1.into_analog();
 
     // Set up comparator with pa1 as positive, and the DAC as negative input
     let comp = comp1.comparator(
-        &pa1,
-        &dac,
+        pa1,
+        dac_token,
         comparator::Config::default().hysteresis(comparator::Hysteresis::None),
         &rcc.clocks,
     );

examples/observe.rs

@@ -0,0 +1,64 @@
+//! ## Origin
+//!
+//! This code has been taken from the stm32g0xx-hal project and modified slightly to support
+//! STM32G4xx MCUs.
+
+//#![deny(warnings)]
+#![deny(unsafe_code)]
+#![no_main]
+#![no_std]
+
+mod utils;
+use utils::logger::info;
+extern crate cortex_m_rt as rt;
+
+use fugit::ExtU32 as _;
+use hal::{
+    adc::AdcClaim as _,
+    comparator::{ComparatorExt, ComparatorSplit, Config},
+    delay::SYSTDelayExt as _,
+    gpio::GpioExt,
+    observable::Observable as _,
+    rcc::RccExt,
+    stm32,
+};
+use rt::entry;
+use stm32g4xx_hal::{self as hal, adc::config::SampleTime, delay::DelayExt as _};
+
+#[entry]
+fn main() -> ! {
+    let cp = cortex_m::Peripherals::take().unwrap();
+    let dp = stm32::Peripherals::take().unwrap();
+    let mut rcc = dp.RCC.constrain();
+
+    let gpioa = dp.GPIOA.split(&mut rcc);
+
+    let (comp1, ..) = dp.COMP.split(&mut rcc);
+
+    let (pa1, [pa1_token]) = gpioa // <- The pin to keep track of
+        .pa1
+        .into_analog()
+        .observe();
+    let pa0 = gpioa.pa0.into_analog(); // <- Reference voltage
+
+    // Only pa1_token and pa0 consumed here
+    let comp1 = comp1.comparator(pa1_token, pa0, Config::default(), &rcc.clocks);
+    let _comp1 = comp1.enable(); // <-- TODO: Do things with comparator
+
+    let mut delay = cp.SYST.delay(&rcc.clocks);
+    let mut adc = dp.ADC1.claim_and_configure(
+        stm32g4xx_hal::adc::ClockSource::SystemClock,
+        &rcc,
+        stm32g4xx_hal::adc::config::AdcConfig::default(),
+        &mut delay,
+        false,
+    );
+
+    // Can not reconfigure pa1 here
+    loop {
+        // Can still use pa1 here
+        let sample = adc.convert(pa1.as_ref(), SampleTime::Cycles_640_5);
+        info!("Reading: {}", sample);
+        delay.delay(1000.millis());
+    }
+}

examples/opamp.rs

@@ -5,7 +5,7 @@
 
 use stm32g4xx_hal::adc::AdcClaim;
 use stm32g4xx_hal::adc::ClockSource;
-use stm32g4xx_hal::opamp::{Gain, InternalOutput};
+use stm32g4xx_hal::opamp::Gain;
 use stm32g4xx_hal::prelude::*;
 use stm32g4xx_hal::pwr::PwrExt;
 
@@ -34,12 +34,20 @@ fn main() -> ! {
     // setup opamps
     let (opamp1, opamp2, opamp3, ..) = dp.OPAMP.split(&mut rcc);
 
+    let pa1 = gpioa.pa1.into_analog();
+    let pa2 = gpioa.pa2.into_analog();
+    let pa7 = gpioa.pa7.into_analog();
+
+    let pb0 = gpiob.pb0.into_analog();
+    let pb1 = gpiob.pb1.into_analog();
+    let pb2 = gpiob.pb2.into_analog();
+
     // Set up opamp1 and opamp2 in follower mode
-    let opamp1 = opamp1.follower(gpioa.pa1, gpioa.pa2);
-    let opamp2 = opamp2.follower(gpioa.pa7, InternalOutput);
+    let opamp1 = opamp1.follower(pa1).enable_output(pa2);
+    let opamp2 = opamp2.follower(pa7);
 
     // Set up opamp1 and opamp2 in open loop mode
-    let opamp3 = opamp3.open_loop(gpiob.pb0, gpiob.pb2, gpiob.pb1);
+    let opamp3 = opamp3.open_loop(pb0, pb2).enable_output(pb1);
 
     // disable opamps
     let (opamp1, pa1, pa2) = opamp1.disable();
@@ -48,18 +56,10 @@ fn main() -> ! {
     let (_opamp3, _pb0, _pb2, _pb1) = opamp3.disable();
 
     // Configure opamp1 with pa1 as non-inverting input and set gain to x2
-    let _opamp1 = opamp1.pga(
-        pa1,
-        pa2, // Route output to pin pa2
-        Gain::Gain2,
-    );
+    let _opamp1 = opamp1.pga(pa1, Gain::Gain2).enable_output(pa2); // Route output to pin pa2
 
     // Configure op with pa7 as non-inverting input and set gain to x4
-    let opamp2 = opamp2.pga(
-        pa7,
-        InternalOutput, // Do not route output to any external pin, use internal AD instead
-        Gain::Gain4,
-    );
+    let opamp2 = opamp2.pga(pa7, Gain::Gain4); // Do not route output to any external pin, use internal AD instead
 
     // Lock opamp2. After the opamp is locked its registers cannot be written
     // until the device is reset (even if using unsafe register accesses).