H7: Add initial PLL configuration

embassy-stm32/src/rcc/h7/mod.rs

@@ -0,0 +1,27 @@
+use crate::pac::RCC;
+
+mod pll;
+pub use pll::PllConfig;
+
+const HSI: u32 = 64_000_000; // Hz
+const CSI: u32 = 4_000_000; // Hz
+const HSI48: u32 = 48_000_000; // Hz
+const LSI: u32 = 32_000; // Hz
+
+/// Configuration of the core clocks
+#[non_exhaustive]
+#[derive(Default)]
+pub struct Config {
+    pub hse: Option<u32>,
+    pub bypass_hse: bool,
+    pub sys_ck: Option<u32>,
+    pub per_ck: Option<u32>,
+    pub hclk: Option<u32>,
+    pub pclk1: Option<u32>,
+    pub pclk2: Option<u32>,
+    pub pclk3: Option<u32>,
+    pub pclk4: Option<u32>,
+    pub pll1: PllConfig,
+    pub pll2: PllConfig,
+    pub pll3: PllConfig,
+}