Add Adc::new_with_clock() to configure analog clock

Required on STM32WL with default HAL initialization.

The function is only available for adc_g0, but all
that have clock config should add implementations.

1 files changed, 39 insertions, 0 deletions

diff --git a/examples/stm32wl/src/bin/adc.rs b/examples/stm32wl/src/bin/adc.rs
new file mode 100644
index 000000000..118f02ae1
--- /dev/null
+++ b/examples/stm32wl/src/bin/adc.rs
@@ -0,0 +1,39 @@
+#![no_std]
+#![no_main]
+
+use core::mem::MaybeUninit;
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::adc::{Adc, CkModePclk, Clock, SampleTime};
+use embassy_stm32::SharedData;
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+static SHARED_DATA: MaybeUninit<SharedData> = MaybeUninit::uninit();
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init_primary(Default::default(), &SHARED_DATA);
+    info!("Hello World!");
+
+    let mut adc = Adc::new_with_clock(p.ADC1, Clock::Sync { div: CkModePclk::DIV1 });
+    adc.set_sample_time(SampleTime::CYCLES79_5);
+    let mut pin = p.PB2;
+
+    let mut vrefint = adc.enable_vrefint();
+    let vrefint_sample = adc.blocking_read(&mut vrefint);
+    let convert_to_millivolts = |sample| {
+        // From https://www.st.com/resource/en/datasheet/stm32g031g8.pdf
+        // 6.3.3 Embedded internal reference voltage
+        const VREFINT_MV: u32 = 1212; // mV
+
+        (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16
+    };
+
+    loop {
+        let v = adc.blocking_read(&mut pin);
+        info!("--> {} - {} mV", v, convert_to_millivolts(v));
+        Timer::after_millis(100).await;
+    }
+}