Tap Tempi Arduino Style

Grumble

I call this module TAP TEMPI because it outputs several tempos (aka tempi).

First there is a three position switch which positions corresponds with three settings for the internal clock:
upper position: interrupt time flag is set every 1mSec
mid position: interrupt flag is suppressed
down position: interrupt flag is set every 0.5mSec
The up and down positions only have effect when using the TAP switch for setting the base tempo!
There are two ways to set the base tempo: By means of a clock input (5 volt) or by pushing the TAP switch twice.
The Arduino will measure the time between two TAP's (or two positive going edges from the Trig IN input.
On the TAP input to the Arduino there is a de-bounce RC filter formed by R7, C1 (100NF) and the internal pull-up resistor of PD3.
When this is done, the Arduino calculates the timing for the x1 (base frequency), the x2 (double frequency), x3 (triple the base frequency) and x4 (quadruple the base frequency).
Also there are four momentary push-buttons to chose one of the frequencies to output to the Chose output.

I use an Arduino NANO for this but didn't use the Arduino IDE, instead I used ATMEL Studio for this project.

Schematic Tap Tempi.pdf

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Schematic Tap Tempi.pdf

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TEMPI.txt

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This is the program used in TXT format