Paul Mathieu 14dba00fd0 Add dsp ...

With:
- LED control
- UART
- PDM out
- square wave generator (DMA to PDM out (was it really necessary?))
- sample program that plays a square wave from UART values

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..

boot_rom.vhdl.in

Add dsp

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dsp_test.vhdl

Add dsp

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dsp.vhdl

Add dsp

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led.h

Add dsp

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main.c

Add dsp

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makefile

Add dsp

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sys.h

Add dsp

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