270 jku-sky-LEDSpinner
270 : jku-sky-LEDSpinner
- Author: Tim Tremetsberger
- Description: LED Spinner on 7-Seg display with variable speeds
- GitHub repository
- Open in 3D viewer
- Clock: 50000000 Hz
LED Spinner TinyTapeout Project
Module: tt_um_timba307_LEDSpinner
Play Roulette using a 7-segment display hooked up to the chip. Using the TinyTapeout Demo Board, the built-in 7-segment can be used directly.
How it works
The "wheel" of the Roulette is compromised of the outer segments on the 7-segment display. When powering on, the wheel will instantly start spinning. The speed can be configured using ui_in[3:0]. These pins influence the size of the prescaler. The prescaler.v module generates ticks slow enough to enable seeing the rotating led segments. For every tick, a pseudo-random number is generated using a linear feedback shift register in the rng.v module. The wheel.v module controls the position of the active led on the ring and the stopping behaviour. If the user wants to stop the wheel ui_in[7] is activated. From this point on the wheel will use the random number to choose a stopping location and will spin till it reaches that location. Beforehand, the user takes a guess using the uio_in[5:0]. If the wheel lands on the correct guess (multiple guesses are also allowed), the guess_eval.v module will light up the point of the 7-seg display. The control of the 7-segment display is handled using the seg_driver.v module. After ui_in[7] is deactivated the wheel will continue to spin again and a new guess can be made.
| Signal | Dir | W | Purpose |
|---|---|---|---|
ui_in[3:0] |
in | 4 | Set speed, only 4b0000, 4b0001, 4b0011, 4b0111, 4b1111 are allowed for 1 Hz, 2 Hz, 4 Hz, 8 Hz and 16 Hz respectively. Invalid config triggers 1 kHz speed for testing purposes. |
ui_in[7] |
in | 1 | Stop the wheel |
uio_in[0] |
in | 1 | Guess top segment |
uio_in[1] |
in | 1 | Guess top right segment |
uio_in[2] |
in | 1 | Guess bottom right segment |
uio_in[3] |
in | 1 | Guess bottom segment |
uio_in[4] |
in | 1 | Guess bottom left segment |
uio_in[5] |
in | 1 | Guess top left segment |
uo_out[6:0] |
out | 7 | 7-segment outer ring |
uo_out[7] |
out | 1 | 7-segment display point |
clk |
in | 1 | System clock |
rst_n |
in | 1 | Async reset (active-low) |
ena |
in | 1 | Always 1 on TinyTapeout |
How to test
Every module has a dedicated testbench file for gtkwave plot generation. Run the simulate.sh script to automatically simulate the plots and open gtkwave.
External hardware
If the TinyTapeout Demo Board is used, just one additional set of dip-switches is needed for the bidirectional inputs. If the demo board is not used, then two sets of dip-switches and a 7-segment display is needed.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | speed_bit0 | seg_top | guess_top |
| 1 | speed_bit1 | seg_top_right | guess_top_right |
| 2 | speed_bit2 | seg_bot_right | guess_bot_right |
| 3 | speed_bit3 | seg_bot | guess_bot |
| 4 | seg_bot_left | guess_bot_left | |
| 5 | seg_top_left | guess_top_left | |
| 6 | seg_middle | ||
| 7 | stop_wheel | seg_dp |