Add basic RTC support

1 files changed, 63 insertions, 0 deletions

diff --git a/examples/stm32wba6/src/bin/rtc.rs b/examples/stm32wba6/src/bin/rtc.rs
new file mode 100644
index 000000000..1e5634c60
--- /dev/null
+++ b/examples/stm32wba6/src/bin/rtc.rs
@@ -0,0 +1,63 @@
+#![no_std]
+#![no_main]
+
+// use chrono::{NaiveDate, NaiveDateTime};
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::Config;
+use embassy_stm32::rcc::*;
+use embassy_stm32::rtc::{DateTime, DayOfWeek, Rtc, RtcConfig};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+pub fn pll_init(config: &mut Config) {
+    config.rcc.pll1 = Some(embassy_stm32::rcc::Pll {
+        source: PllSource::HSI,
+        prediv: PllPreDiv::DIV1,  // PLLM = 1 → HSI / 1 = 16 MHz
+        mul: PllMul::MUL30,       // PLLN = 30 → 16 MHz * 30 = 480 MHz VCO
+        divr: Some(PllDiv::DIV5), // PLLR = 5 → 96 MHz (Sysclk)
+        // divq: Some(PllDiv::DIV10), // PLLQ = 10 → 48 MHz (NOT USED)
+        divq: None,
+        divp: Some(PllDiv::DIV30), // PLLP = 30 → 16 MHz (USBOTG)
+        frac: Some(0),             // Fractional part (enabled)
+    });
+
+    config.rcc.ahb_pre = AHBPrescaler::DIV1;
+    config.rcc.apb1_pre = APBPrescaler::DIV1;
+    config.rcc.apb2_pre = APBPrescaler::DIV1;
+    config.rcc.apb7_pre = APBPrescaler::DIV1;
+    config.rcc.ahb5_pre = AHB5Prescaler::DIV4;
+
+    // voltage scale for max performance
+    config.rcc.voltage_scale = VoltageScale::RANGE1;
+    // route PLL1_P into the USB‐OTG‐HS block
+    config.rcc.sys = Sysclk::PLL1_R;
+}
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut config = Config::default();
+
+    pll_init(&mut config);
+
+    let p = embassy_stm32::init(config);
+
+    let mut rtc = Rtc::new(p.RTC, RtcConfig::default());
+
+    // Setting datetime
+    let initial_datetime = DateTime::from(2025, 12, 9, DayOfWeek::Tuesday, 11, 00, 00, 0).unwrap();
+    match rtc.0.set_datetime(initial_datetime) {
+        Ok(()) => info!("RTC set successfully."),
+        Err(e) => error!("Failed to set RTC date/time: {:?}", e),
+    }
+
+    // Reading datetime every 1s
+    loop {
+        match rtc.1.now() {
+            Ok(result) => info!("{}", result),
+            Err(e) => error!("Failed to set RTC date/time: {:?}", e),
+        }
+
+        Timer::after_millis(1000).await;
+    }
+}