Add fractional divider support for RMT hal

esp-hal/CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Previously unavailable memory is available via `.dram2_uninit` section (#2079)
 - You can now use `Input`, `Output`, `OutputOpenDrain` and `Flex` pins as EXTI and RTCIO wakeup sources (#2095)
 - Added `Rtc::set_current_time` to allow setting RTC time, and `Rtc::current_time` to getting RTC time while taking into account boot time (#1883)
+- Add RMT fractional divider support.
 
 ### Changed
 

esp-hal/src/rmt.rs

@@ -2541,7 +2541,12 @@ mod clock_divider_solver {
                 } else if a < b {
                     l = m;
                 } else {
-                    unreachable!();
+                    // unreachable!();
+                    return Some(Self {
+                        div_num: quotient,
+                        div_b: m.numerator,
+                        div_a: m.denominator,
+                    });
                 }
             }
         }