Added PLL HAL code for STM32WBA

1 files changed, 23 insertions, 3 deletions

diff --git a/examples/stm32wba/src/bin/usb_hs_serial.rs b/examples/stm32wba/src/bin/usb_hs_serial.rs
index 1ffd94906..be2d0a4e5 100644
--- a/examples/stm32wba/src/bin/usb_hs_serial.rs
+++ b/examples/stm32wba/src/bin/usb_hs_serial.rs
@@ -7,9 +7,10 @@ use embassy_executor::Spawner;
 use embassy_futures::join::join;
 use embassy_stm32::usb::{Driver, Instance};
 use embassy_stm32::{bind_interrupts, peripherals, usb, Config};
-use embassy_stm32::rcc::{VoltageScale, Hse, HsePrescaler, Sysclk, mux};
+use embassy_stm32::rcc::{VoltageScale, Hse, HsePrescaler, APBPrescaler, AHBPrescaler, Sysclk, mux};
 use embassy_usb::class::cdc_acm::{CdcAcmClass, State};
 use embassy_usb::driver::EndpointError;
+use embassy_stm32::rcc::PllSource;
 use embassy_usb::Builder;
 use panic_probe as _;
 
@@ -23,12 +24,31 @@ async fn main(_spawner: Spawner) {
 
     let mut config = Config::default();
 
-    // ── Run off the external 32 MHz crystal directly ──
+    // External HSE (32 MHz) setup
     config.rcc.hse = Some(Hse { prescaler: HsePrescaler::DIV1 });
-    config.rcc.sys = Sysclk::HSE;
+
     // route HSE into the USB‐OTG‐HS block
     config.rcc.mux.otghssel = mux::Otghssel::HSE;
     config.rcc.sys = Sysclk::HSE;
+
+    // Fine-tune PLL1 dividers/multipliers
+    config.rcc.pll1 = Some(embassy_stm32::rcc::Pll {
+    source: PllSource::HSE,
+    pllm: 2,          // PLLM = 2 → HSE / 2 = 16 MHz input
+    mul: 12,            // PLLN = 12 → 16 MHz * 12 = 192 MHz VCO
+    divp: Some(2),      // PLLP = 2 → 96 MHz
+    divq: Some(2),      // PLLQ = 2 → 96 MHz
+    divr: Some(2),      // PLLR = 2 → 96 MHz
+    frac: Some(4096),   // 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;
+
+    // voltage scale for max performance
     config.rcc.voltage_scale = VoltageScale::RANGE1;
 
     let p = embassy_stm32::init(config);