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-Hardware timers
-===============
-
-Timers can be used for a great variety of tasks, calling a function periodically,
-counting events, and generating a PWM signal are among the most common use cases.
-Each timer consists of two 16-bit channels and this channels can be tied together to
-form one 32-bit timer. The operating mode needs to be configured per timer, but then
-the period (or the frequency) can be independently configured on each channel. 
-By using the callback method, the timer event can call a Python function.
-
-Example usage to toggle an LED at a fixed frequency::
-
-    from machine import Timer
-    from machine import Pin
-    led = Pin('GP16', mode=Pin.OUT)                  # enable GP16 as output to drive the LED
-    tim = Timer(3)                                   # create a timer object using timer 3
-    tim.init(mode=Timer.PERIODIC)                    # initialize it in periodic mode
-    tim_ch = tim.channel(Timer.A, freq=5)            # configure channel A at a frequency of 5Hz
-    tim_ch.irq(handler=lambda t:led.toggle(), trigger=Timer.TIMEOUT)        # toggle a LED on every cycle of the timer
-
-Example using named function for the callback::
-
-    from machine import Timer
-    from machine import Pin
-    tim = Timer(1, mode=Timer.PERIODIC, width=32)
-    tim_a = tim.channel(Timer.A | Timer.B, freq=1)   # 1 Hz frequency requires a 32 bit timer
-
-    led = Pin('GP16', mode=Pin.OUT) # enable GP16 as output to drive the LED
-
-    def tick(timer):                # we will receive the timer object when being called
-        global led
-        led.toggle()                # toggle the LED
-
-    tim_a.irq(handler=tick, trigger=Timer.TIMEOUT)         # create the interrupt
-
-Further examples::
-
-    from machine import Timer
-    tim1 = Timer(1, mode=Timer.ONE_SHOT)                               # initialize it in one shot mode
-    tim2 = Timer(2, mode=Timer.PWM)                                    # initialize it in PWM mode
-    tim1_ch = tim1.channel(Timer.A, freq=10, polarity=Timer.POSITIVE)  # start the event counter with a frequency of 10Hz and triggered by positive edges
-    tim2_ch = tim2.channel(Timer.B, freq=10000, duty_cycle=5000)       # start the PWM on channel B with a 50% duty cycle
-    tim2_ch.freq(20)                                                   # set the frequency (can also get)
-    tim2_ch.duty_cycle(3010)                                           # set the duty cycle to 30.1% (can also get)
-    tim2_ch.duty_cycle(3020, Timer.NEGATIVE)                           # set the duty cycle to 30.2% and change the polarity to negative
-    tim2_ch.period(2000000)                                            # change the period to 2 seconds
-
-
-Additional constants for Timer class
-------------------------------------
-
-.. data:: Timer.PWM
-
-   PWM timer operating mode.
-
-.. data:: Timer.A
-.. data:: Timer.B
-
-   Selects the timer channel. Must be ORed (``Timer.A`` | ``Timer.B``) when
-   using a 32-bit timer.
-
-.. data:: Timer.POSITIVE
-.. data:: Timer.NEGATIVE
-
-   Timer channel polarity selection (only relevant in PWM mode).
-
-.. data:: Timer.TIMEOUT
-.. data:: Timer.MATCH
-
-   Timer channel IRQ triggers.