stm32: Implement reads of DTS peripheral

Only PCLK-driven operation is supported.

examples/stm32h5/src/bin/dts.rs

@@ -0,0 +1,75 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::dts::{Dts, InterruptHandler, SampleTime};
+use embassy_stm32::peripherals::DTS;
+use embassy_stm32::rcc::frequency;
+use embassy_stm32::{bind_interrupts, dts, Config};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    DTS => InterruptHandler;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut config = Config::default();
+    {
+        use embassy_stm32::rcc::*;
+        config.rcc.hsi = Some(HSIPrescaler::DIV1);
+        config.rcc.csi = true;
+        config.rcc.pll1 = Some(Pll {
+            source: PllSource::HSI,
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL25,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV4), // SPI1 cksel defaults to pll1_q
+            divr: None,
+        });
+        config.rcc.pll2 = Some(Pll {
+            source: PllSource::HSI,
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL25,
+            divp: None,
+            divq: None,
+            divr: Some(PllDiv::DIV4), // 100mhz
+        });
+        config.rcc.sys = Sysclk::PLL1_P; // 200 Mhz
+        config.rcc.ahb_pre = AHBPrescaler::DIV1; // 200 Mhz
+        config.rcc.apb1_pre = APBPrescaler::DIV2; // 100 Mhz
+        config.rcc.apb2_pre = APBPrescaler::DIV2; // 100 Mhz
+        config.rcc.apb3_pre = APBPrescaler::DIV2; // 100 Mhz
+        config.rcc.voltage_scale = VoltageScale::Scale1;
+        config.rcc.mux.adcdacsel = mux::Adcdacsel::PLL2_R;
+    }
+    let p = embassy_stm32::init(config);
+
+    info!("Hello World!");
+
+    let mut config = dts::Config::default();
+    config.sample_time = SampleTime::ClockCycles15;
+    let mut dts = Dts::new(p.DTS, Irqs, config);
+
+    let cal = Dts::factory_calibration();
+    let convert_to_celsius = |raw_temp: u16| {
+        let raw_temp = raw_temp as f32;
+        let sample_time = (config.sample_time as u8) as f32;
+
+        let f = frequency::<DTS>().0 as f32;
+
+        let t0 = cal.t0 as f32;
+        let fmt0 = cal.fmt0.0 as f32;
+        let ramp_coeff = cal.ramp_coeff as f32;
+
+        ((f * sample_time / raw_temp) - fmt0) / ramp_coeff + t0
+    };
+
+    loop {
+        let temp = dts.read().await;
+        info!("Temp: {} degrees", convert_to_celsius(temp));
+        Timer::after_millis(500).await;
+    }
+}