= Beeper =

A built-in beeper is provided that beeps when touchscreen buttons are pressed, or based on app control.

The beeper device /dev/cardbeep accepts formatted strings containing various notes to play. The following notes are supported:
||'''Note'''||'''Octave'''||'''Frequency (Hz)'''||
||C||5||523.25||
||D||5||587.33||
||E||5||659.26||
||F||5||698.46||
||G||5||783.99||
||A||5||880||
||B||5||987.77||
||C||6||1046.5||
||E||6||1318.5||
||G||6||1568||
||A||6||1760||
||C||7||2093||
||D||7||2349.3||
||E||7||2637||

A string can be formatted to send to the device in the format:
{{{

<duration><note><octave>
 * duration
  * 1 – 8, note = 1/duration
   * 1 = whole (1/1) note
   * 4 = quarter (1/4) note
   * 8 = eighth (1/8) note
 * note - letter from above table
 * octave - number from above table
}}}

Commas are used to separate note information, for example:
{{{
4A5,8E6
}}}
Plays a 1/4 note A in octave five then a 1/8 note E in octave 6.

The default octave may be set by:
{{{
O<octave>
}}}

Example:
{{{
O5,A,B,C
}}}
Sets the default octave to 5 then plays note A, B, and C.

The tempo may be set by:
{{{
T<tempo>
}}}
''tempo must be three characters numeric'''

Example:
{{{
T100,A,B
}}}
Sets the tempo to 100 then plays note A and B.

Refer to the lib825ev library [wiki:Docs/Prog/Manual/ApplicationLibraries/lib825ev/KeypadSound/PlayNotes PlayNotes] function for application beeper output.