Changes between Version 3 and Version 4 of Docs/825gen2/Dev/Devices/Beeper

Timestamp:

09/18/24 12:59:29 (14 months ago)

Author:

Don Wilson

Comment:

--

Docs/825gen2/Dev/Devices/Beeper

@@ -2 +2 @@
 
 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 functions for sound output.
+http://tech.825spectrum.com/trac/wiki/Docs/Prog/Manual/ApplicationLibraries/lib825ev/KeypadSound#KeypadSoundFunctions
+
+