stm32/rtc: fix datetime and add f4 test

tests/stm32/Cargo.toml

@@ -6,7 +6,7 @@ license = "MIT OR Apache-2.0"
 
 [features]
 stm32f103c8 = ["embassy-stm32/stm32f103c8"]     # Blue Pill
-stm32f429zi = ["embassy-stm32/stm32f429zi", "sdmmc"]     # Nucleo
+stm32f429zi = ["embassy-stm32/stm32f429zi", "sdmmc", "chrono"]     # Nucleo
 stm32g071rb = ["embassy-stm32/stm32g071rb"]     # Nucleo
 stm32c031c6 = ["embassy-stm32/stm32c031c6"]     # Nucleo
 stm32g491re = ["embassy-stm32/stm32g491re"]     # Nucleo
@@ -16,6 +16,7 @@ stm32h563zi = ["embassy-stm32/stm32h563zi"]     # Nucleo
 stm32u585ai = ["embassy-stm32/stm32u585ai"]     # IoT board
 
 sdmmc = []
+chrono = ["embassy-stm32/chrono", "dep:chrono"]
 
 [dependencies]
 embassy-sync = { version = "0.2.0", path = "../../embassy-sync", features = ["defmt"] }
@@ -33,6 +34,8 @@ embedded-hal-1 = { package = "embedded-hal", version = "=1.0.0-alpha.10" }
 embedded-hal-async = { version = "=0.2.0-alpha.1" }
 panic-probe = { version = "0.3.0", features = ["print-defmt"] }
 
+chrono = { version = "^0.4", default-features = false, optional = true}
+
 # BEGIN TESTS
 # Generated by gen_test.py. DO NOT EDIT.
 [[bin]]
@@ -40,6 +43,11 @@ name = "gpio"
 path = "src/bin/gpio.rs"
 required-features = []
 
+[[bin]]
+name = "rtc"
+path = "src/bin/rtc.rs"
+required-features = [ "chrono",]
+
 [[bin]]
 name = "sdmmc"
 path = "src/bin/sdmmc.rs"

tests/stm32/src/bin/rtc.rs

@@ -0,0 +1,52 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+// required-features: chrono
+
+#[path = "../example_common.rs"]
+mod example_common;
+use chrono::{NaiveDate, NaiveDateTime};
+use defmt::assert;
+use embassy_executor::Spawner;
+use embassy_stm32::pac;
+use embassy_stm32::rtc::{Rtc, RtcConfig};
+use embassy_time::{Duration, Timer};
+use example_common::*;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init(config());
+    info!("Hello World!");
+
+    let now = NaiveDate::from_ymd_opt(2020, 5, 15)
+        .unwrap()
+        .and_hms_opt(10, 30, 15)
+        .unwrap();
+
+    info!("Starting LSI");
+
+    unsafe {
+        pac::RCC.csr().modify(|w| w.set_lsion(true));
+        while !pac::RCC.csr().read().lsirdy() {}
+    }
+
+    info!("Started LSI");
+
+    let mut rtc = Rtc::new(p.RTC, RtcConfig::default());
+
+    rtc.set_datetime(now.into()).expect("datetime not set");
+
+    info!("Waiting 5 seconds");
+    Timer::after(Duration::from_millis(5000)).await;
+
+    let then: NaiveDateTime = rtc.now().unwrap().into();
+    let seconds = (then - now).num_seconds();
+
+    defmt::info!("measured = {}", seconds);
+
+    assert!(seconds > 3 && seconds < 7);
+
+    info!("Test OK");
+    cortex_m::asm::bkpt();
+}