add tone generator
I added the tone generator and fixed de1_audio testbench (50 MHz) The audio codec now works with 50 MHz. I did not change this in the testbench.
pnr/de1_tone/makefile
0 → 100644
sim/de1_tone/makefile
0 → 100644
src/de1_tone.vhd
0 → 100644
src/t_de1_tone.vhd
0 → 100644
src/tone_rtl.vhd
0 → 100644
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