spi-slave-to-7segLED

A demo written for experimental Tiny Tapeout ECP5 prototyping board.

Description

The design implements a SPI-slave device for seven-segment display on TT base board. TT FPGA controls seven-segment display via spi-slave and the RP2040 just sends it a 6-bit message to light up the LEDs.

How to run this design

You'll need a (i) TinyTapeout Demo Board, (ii)TinyTapeout ECP5 Breakout Board and (iii) Raspberry Pi Pico.

Build and Program

While in the source directory do this -

cd ./programmer
make
make prog

You can also manually take the bit-file(from above make process) and feed to programmer.

python -m mpremote connect COM20 mount . + exec "import os; os.chdir('/remote'); import ecp_prog; ecp_prog.execute('spi_7seg.bit')"

Upload micropython firmware

Copy micropython i.e. micropython/main.py to micropython filesystem. Use Thonny IDE or any appropriate REPL shell to use the command below -

 send_spi_6bit(create_message(0b01,0xE))

When you're done, this is how it is supposed to show output -

Note

Do adjustments in verilog for negedge block describing rst_n and sclk signals. This is only to get it working on a higher clock or different FPGA altogether.