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The assumption that all STM32 timers have exactly four channels no longer holds. E.g. the STM32L4 has the following general purpose timers: - TIM2: 32 bit, 4 channels - TIM15: 16 bit, 2 channels - TIM16: 16 bit, 1 channel Hence, a new field is added to the timer configuration to also contain the number of timer channels. Due to alignment the `struct` previously was padded by 16 bit, so adding another 8 bit field doesn't increase its size. For backward compatibility, a value of `0` is considered as alias for `TIMER_CHANNEL_NUMOF` (or 4), so that the number of timer channels only needs to be set when the timer is different from the typical 4 channel timer. This helps backward compatibility.