nrf: add main macro support

embassy-macros/src/chip/stm32.rs

@@ -0,0 +1,51 @@
+use darling::FromMeta;
+use proc_macro2::TokenStream;
+use quote::{format_ident, quote};
+use syn::spanned::Spanned;
+
+#[derive(Debug, FromMeta)]
+pub struct Args {
+    #[darling(default)]
+    pub use_hse: Option<u32>,
+    #[darling(default)]
+    pub sysclk: Option<u32>,
+    #[darling(default)]
+    pub pclk1: Option<u32>,
+}
+
+pub fn generate(args: Args) -> TokenStream {
+    let mut clock_cfg_args = quote! {};
+    if args.use_hse.is_some() {
+        let mhz = args.use_hse.unwrap();
+        clock_cfg_args = quote! { #clock_cfg_args.use_hse(#mhz.mhz()) };
+    }
+
+    if args.sysclk.is_some() {
+        let mhz = args.sysclk.unwrap();
+        clock_cfg_args = quote! { #clock_cfg_args.sysclk(#mhz.mhz()) };
+    }
+
+    if args.pclk1.is_some() {
+        let mhz = args.pclk1.unwrap();
+        clock_cfg_args = quote! { #clock_cfg_args.pclk1(#mhz.mhz()) };
+    }
+
+    quote!(
+        use embassy_stm32::{rtc, interrupt, Peripherals, pac, hal::rcc::RccExt, hal::time::U32Ext};
+
+        let dp = pac::Peripherals::take().unwrap();
+        let rcc = dp.RCC.constrain();
+        let clocks = rcc.cfgr#clock_cfg_args.freeze();
+
+        unsafe { Peripherals::set_peripherals(clocks) };
+
+        let mut rtc = rtc::RTC::new(dp.TIM3, interrupt::take!(TIM3), clocks);
+        let rtc = unsafe { make_static(&mut rtc) };
+        rtc.start();
+        let mut alarm = rtc.alarm1();
+
+        unsafe { embassy::time::set_clock(rtc) };
+
+        let alarm = unsafe { make_static(&mut alarm) };
+    )
+}