Merge #563

563: Initial ADC support for on STM32F1xx  r=Dirbaio a=sjoerdsimons

Add an ADC implementation for F1 based chips. Primarily tested using ADC1, proper functionality for ADC2 probably needs some extra work as it's mainly a slave and can't e.g. measure vrefint by itself.

Needs https://github.com/embassy-rs/stm32-data/pull/115

Co-authored-by: Sjoerd Simons <sjoerd@collabora.com>
Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>

examples/stm32f1/Cargo.toml

@@ -20,3 +20,6 @@ panic-probe = { version = "0.3", features = ["print-defmt"] }
 futures = { version = "0.3.17", default-features = false, features = ["async-await"] }
 heapless = { version = "0.7.5", default-features = false }
 nb = "1.0.0"
+
+[profile.dev]
+opt-level = "s"

examples/stm32f1/src/bin/adc.rs

@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use embassy::executor::Spawner;
+use embassy::time::Delay;
+use embassy_stm32::adc::Adc;
+use embassy_stm32::Peripherals;
+use embassy_traits::delay::Delay as _;
+use example_common::*;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello World!");
+
+    let mut adc = Adc::new(p.ADC1, &mut Delay);
+    let mut pin = p.PB1;
+
+    let mut vref = adc.enable_vref(&mut Delay);
+    adc.calibrate(&mut vref);
+    loop {
+        let v = adc.read(&mut pin);
+        info!("--> {} - {} mV", v, adc.to_millivolts(v));
+        Delay.delay_ms(100).await;
+    }
+}