===== Timer group =====

This group contains all timer and counter peripherals.

<code>
    "timer": {
        "ms_tick": {
            "peripheral" : "systick",
            "mode" : "count overflows",
            "frequency" : "1 kHz",
        }
    }
</code>

==== peripheral ====

defines which peripheral to use. peripherals can be:
  * systick (part of the ARM core)
  * timer1
  * timer2
  * ...

**type**: String

**default**: systick

==== mode ====

defines the operation mode the timer/counte operates in. Possible modes are:
  * count overflows


**type**: enum

**default**: count overflows

==== frequency ====

The frequency defines the time between timer overflows. 1kHz means that the time between overflow events is 1/(1 kHz) = 1 ms.

**type**: string (Hz, kHz, MHz)

**default**: "1 kHz"