using LUT generate sine, square, triangle wave with variable freq

Dependencies:   mbed-dsp mbed

Revision:
0:4a2e0ba6c332
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Nov 08 01:14:27 2016 +0000
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+http://mbed.org/users/mbed_official/code/mbed/builds/25aea2a3f4e3
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