Arithmetic (from Shift Registers) Using the Tang Nano 9K FPGA Board

This video shows an FPGA project (my first) that interacts with a Raspberry Pi. The FPGA implements registers A, B, and C. It supports serial loading of A and B, the math operation C = C + A*B, and serial reading of C. It uses the educational version of the Gowin IDE, and shows how a parallel-in, parallel-out shift register is synthesized.
Chapters
0:00 FPGA resources to be used.
0:35 Project goals and function.
1:05 Design.
2:43 Hardware setup.
2:57 Pin assignments on FPGA and Raspberry Pi.
3:36 Tour of project running.
5:40 Verilog introduction.
6:22 Serial-in, parallel-out shift register.
7:45 Parallel-in, parallel-out shift register.
10:28 What the PIPO synthesizes to.
15:16 Top-level module design.
16:02 Top-level module Verilog.
18:31 FPGA constraints file (assigns pins)
19:03 C program for the Raspberry Pi
21:03 Wrapping up.
See here for project source codes:
github.com/grughuhler/tang_ma...
See here for my getting started video on the Tang Nano 9K:
• Getting started with t...

[@DrKnow65]

nice timing, just watched the getting started video and a minute later this is here :)

[@phillipneal8194]

Thank you. Very nice. Simple interface to an FPGA.

[@jaroslavpsenicka]

I'd be interested in I2C communication between the RPi and the FPGA as it seems a bit more standardized way of data exchange, I can imagine this on the RPi side, but the FPGA remains a mystery for me ATM... thanks for the tutorial BTW it's really nice

[@electronics.tinker]

Gowin has some i2c soft ip that might simplify the test, but it looks like the slave was written for a different FPGA than the one on the Tang Nano 9K. I plan to look into it. It may take some time. I think I must figure out bidirectional signals in a simpler context first.