Merge pull request #40 from mattico/comparator

Implement most comparator features

Author: andresv

examples/comp.rs

@@ -0,0 +1,52 @@
+#![deny(warnings)]
+#![deny(unsafe_code)]
+#![no_main]
+#![no_std]
+
+extern crate cortex_m;
+extern crate cortex_m_rt as rt;
+extern crate panic_halt;
+extern crate stm32g0xx_hal as hal;
+
+use hal::analog::comparator::{Config, Hysteresis, RefintInput};
+use hal::prelude::*;
+use hal::stm32;
+use rt::entry;
+
+#[entry]
+fn main() -> ! {
+    let dp = stm32::Peripherals::take().expect("cannot take peripherals");
+    let mut rcc = dp.RCC.constrain();
+
+    let gpioa = dp.GPIOA.split(&mut rcc);
+
+    let (comp1, comp2) = dp.COMP.split(&mut rcc);
+
+    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.enable();
+    let mut led1 = gpioa.pa5.into_push_pull_output();
+
+    let pa3 = gpioa.pa3.into_analog();
+    let comp2 = comp2.comparator(
+        pa3,
+        RefintInput::VRefintM12,
+        Config::default()
+            .hysteresis(Hysteresis::High)
+            .output_inverted(),
+        &rcc.clocks,
+    );
+    let led2 = gpioa.pa2.into_push_pull_output();
+    // Configure PA2 to the comparator's alternate function so it gets
+    // changed directly by the comparator.
+    comp2.output_pin(led2);
+    let _comp2 = comp2.enable();
+
+    loop {
+        match comp1.output() {
+            true => led1.set_high().unwrap(),
+            false => led1.set_low().unwrap(),
+        }
+    }
+}

examples/comp_window.rs

@@ -0,0 +1,48 @@
+#![deny(warnings)]
+#![deny(unsafe_code)]
+#![no_main]
+#![no_std]
+
+extern crate cortex_m;
+extern crate cortex_m_rt as rt;
+extern crate panic_halt;
+extern crate stm32g0xx_hal as hal;
+
+use hal::analog::comparator::{self, Config, Hysteresis, RefintInput};
+use hal::prelude::*;
+use hal::stm32;
+use rt::entry;
+
+#[entry]
+fn main() -> ! {
+    let dp = stm32::Peripherals::take().expect("cannot take peripherals");
+    let mut rcc = dp.RCC.constrain();
+
+    let gpioa = dp.GPIOA.split(&mut rcc);
+
+    let pa1 = gpioa.pa1.into_analog();
+
+    let comp = comparator::window_comparator12(
+        dp.COMP,
+        pa1,
+        RefintInput::VRefintM14,
+        RefintInput::VRefintM34,
+        Config::default().hysteresis(Hysteresis::Medium),
+        &mut rcc,
+    );
+    let comp = comp.enable();
+
+    let mut led1 = gpioa.pa5.into_push_pull_output();
+    let mut led2 = gpioa.pa6.into_push_pull_output();
+
+    loop {
+        match comp.output() {
+            true => led1.set_high().unwrap(),
+            false => led1.set_low().unwrap(),
+        }
+        match comp.above_lower() {
+            true => led2.set_high().unwrap(),
+            false => led2.set_low().unwrap(),
+        }
+    }
+}