====== countMode ======

''void countMode (u8 cntChannel, u8 cntMode)''
|cntChannel | Channel number (0 or 1 for DP-HCNT) | 
|cntMode | 0 = basic counter increments on both the rising and falling edge of the input.|
|::: |1 = encoder counter that counts up or down based on the phase difference between A and B|
|::: |2 = basic counter increments on the rising edge of the input.|
|::: |3 = basic counter increments on the falling edge of the input.|

When ''cntMode'' is 0, 2, or 3 the channel functions as a basic counter. The module reads from port A (A0 for
channel 0, A1 for channel 1). When in this mode, nothing should be connected to port B (B0 for channel 0,
B1 for channel 1). 

{{ :moacon:countmode:hcntmode.png?nolink |}}

When ''cntMode'' is 1, the channel functions as an encoder counter. 

{{ :moacon:countmode:encodermode.png?nolink |}}

The module counts up or down based on the phase difference between A and B. If A leads B, the counter
counts up. If B leads A, the counter counts down.  The count is updated on both rising and falling edges.

{{ :moacon:countmode:encoder.png }}

''countMode'' will always initialize the count to 0. The count will roll over (65,535 to 0 if increasing, and 0 to 65,535 if decreasing) when the count exceeds 65,535 (16 bit maximum) or falls below 0.

When using a 24V open-collector type encoder, connect like this.

{{ :moacon:countmode:encodermode2.png?nolink |}}
<code c>
countMode(0,0); // Simply, set the counter mode
cnt = count(0); // Reads the current count value of channel 0
</code>

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