add an option to allow overclocking

CHANGELOG.md

@@ -15,11 +15,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Add dac
 - Fix flash error flag clearing
 - Clarify README for windows users
+- Add an option to allow overclocking [#494]
 
 ### Added
 
 - Allow to set HSE bypass bit in `RCC` clock configuration register to use an external clock input on the `OSC_IN` pin
 - support `embedded-hal-1.0`
+
+[#494]: https://github.com/stm32-rs/stm32f1xx-hal/pull/494
 
 ## [v0.10.0] - 2022-12-12
 

src/rcc.rs

@@ -507,6 +507,7 @@ pub struct Config {
     #[cfg(any(feature = "stm32f103", feature = "connectivity"))]
     pub usbpre: UsbPre,
     pub adcpre: AdcPre,
+    pub allow_overclock: bool,
 }
 
 impl Default for Config {
@@ -521,6 +522,7 @@ impl Default for Config {
             #[cfg(any(feature = "stm32f103", feature = "connectivity"))]
             usbpre: UsbPre::Div15,
             adcpre: AdcPre::Div2,
+            allow_overclock: false,
         }
     }
 }
@@ -681,6 +683,7 @@ impl Config {
             #[cfg(any(feature = "stm32f103", feature = "connectivity"))]
             usbpre,
             adcpre: apre_bits,
+            allow_overclock: false,
         }
     }
 
@@ -724,11 +727,13 @@ impl Config {
         );
 
         assert!(
-            sysclk <= 72_000_000
+            self.allow_overclock ||
+            (sysclk <= 72_000_000
                 && hclk <= 72_000_000
                 && pclk1 <= 36_000_000
                 && pclk2 <= 72_000_000
                 && adcclk <= 14_000_000
+            )
         );
 
         Clocks {
@@ -763,6 +768,7 @@ fn rcc_config_usb() {
         #[cfg(any(feature = "stm32f103", feature = "connectivity"))]
         usbpre: UsbPre::Div1,
         adcpre: AdcPre::Div8,
+        allow_overclock: false,
     };
     assert_eq!(config, config_expected);