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*** 2.3.2 ***
- FIX: Fixed spurious characters generated by Serial over USB driver (bug
3276379).
+- NEW: Now it is possible to share DMA channels in the STM32 HAL thanks
+ to a centralized manager. Channels are allocated when the driver is
+ started and released when it is stopped.
- OPT: STM32 PWM driver implementation simplified.
- CHANGE: Now pwmChangePeriod() does not implicitly disable the active
PWM channels.