C6/H2 Make higher LEDC frequencies work (#2520)

* ESP32-C6/H2: Make higher LEDC frequencies work

* FMT

* CHANGELOG.md

esp-hal/CHANGELOG.md

@@ -72,6 +72,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed some SysTimer race conditions and panics (#2451)
 - TWAI: accept all messages by default (#2467)
 - I8080: `set_byte_order()` now works correctly in 16-bit mode (#2487)
+- ESP32-C6/ESP32-H2: Make higher LEDC frequencies work (#2520)
 
 ### Removed
 

esp-hal/src/ledc/channel.rs

@@ -369,6 +369,13 @@ impl<S: crate::ledc::timer::TimerSpeed> Channel<'_, S> {
                 unsafe { w.timer_sel().bits(timer_number) }
             });
         }
+
+        // this is needed to make low duty-resolutions / high frequencies work
+        #[cfg(any(esp32h2, esp32c6))]
+        self.ledc
+            .ch_gamma_wr_addr(self.number as usize)
+            .write(|w| unsafe { w.bits(0) });
+
         self.start_duty_without_fading();
     }