[Ref] FPGA-based DDS implementation
Basic reference
http://www.eetree.io/doc/stepfpgadds20k
verilog basic syntax
https://blog.csdn.net/zhangshuaiisme/article/details/78993582
always block usage
https://blog.csdn.net/kebu12345678 /article/details/81332093
LED control
based on small foot (FPGA development board) and rotary encoder https://www.cirmall.com/circuit/2704/ LED control based on small foot (FPGA development board) and rotary encoder #/ detailsSmall Feetstep
FPGA Rotary Encoding
Switchhttp://www.cirmall.com/bbs/forum.php?mod=viewthread&tid=45184&highlight=Little Feet?mod=viewthread&tid=45184&highlight=Little Feet