The ’tt_um_MultiPatternLEDSequencer_RSYO3000.v’ is just a wrapper for the tinytapeout I/O. Inside this, theres a top wrapper for the project called ‘MultiPatternLEDSequencer.v’ that connects to the tinytapeout wrapper and instances the following modules: ‘PLL_10MHztoNHz.v’ and ‘MPLS.v’
The ‘PLL_10MHztoNHz.v’ contains a verilog that can change the 10MHz frequency input to 1Hz, 2Hz 5Hz and 50Hz, to see the LEDs with various frequencies via the (‘clk_selector’) signal.
The ‘MPLS.v’ is the main module, it uses a combination of counters, feedback loops, and pattern selection logic to generate different LED patterns. The pattern selection signal (‘pattern_sel’) determines which LED pattern to display.
The ‘demo_counter’ is used to cycle through all the available patterns when (‘pattern_sel’) is 31.
The ‘pattern_counter’ and ‘oh_counter’ are used to generate specific timing sequences for the LED patterns.
The ’lfsr_reg’ implements a Linear Feedback Shift Register (LFSR) to generate pseudo-random sequences.
A ‘case’ selects from the selected (‘pattern_sel’) to display the selected pattern out of the 30 available patterns through the 8 outputs. The 30 patterns are the following ones:
Pattern 0: All LEDs OFF Turn off all the LEDs.
Pattern 1: All LEDs ON Turn on all the LEDs at once.
Pattern 2: Blinking LEDs Make the LEDs alternate between on and off, creating a blinking effect.
Pattern 3: Running lights The LEDs move in a sequence, like lights running down a line.
Pattern 4: Alternating LEDs Alternate the LEDs in an on-off pattern.
Pattern 5: Negative running lights Similar to pattern 3, but with the LEDs off where they were on, and vice versa.
Pattern 6: KR effect The LEDs flicker and shift, producing a mysterious “Knight Rider” effect.
Pattern 7: Bouncing lights Lights bounce back and forth.
Pattern 8: LED wave effect Create a wave-like pattern that travels along the LEDs.
Pattern 9: Alternating LED groups Divide the LEDs into groups of 2 that alternate turning on and off.
Pattern 10: Heartbeat Make the LEDs pulse in a heartbeat-like rhythm.
Pattern 11: p-Random LFSR LEDs Use a random number generator to make the LEDs light up in a pseudo-random pattern.
Pattern 12: XOR All XOR all counters, creating a unique show.
Pattern 13: Binary counter Display a binary counting sequence on the LEDs.
Pattern 14: Clockwise LED rotation Rotate the LEDs in a clockwise direction.
Pattern 15: XOR Pattern XOR between one hot counter and binary counter.
Pattern 16: Bouncing lights Similar to pattern 7, but with a slightly different bounce effect.
Pattern 17: Diagonal Bounce Make the LEDs bounce diagonally across the LEDs.
Pattern 18: Circular Bounce Create a circular bounce effect, like lights moving in a loop.
Pattern 19: Random Bounce The LEDs bounce pseudo-randomly.
Pattern 20: Negative Diagonal Bounce Like pattern 17, but with the LEDs off where they were on, and vice versa.
Pattern 21: Accelerating Bounce The bouncing effect speeds up over time.
Pattern 22: Gravity Effect LEDs appear to “fall” downward, creating a gravity-like effect.
Pattern 23: Spring Effect Like pattern 8, but with a spring-like bounce in the wave effect.
Pattern 24: Reflecting Bounce Create a bouncing pattern that reflects off the edges.
Pattern 25: Double Bounce Similar to pattern 17, but with the middle LEDs on.
Pattern 26: Wave Bounce A wave-like pattern that bounces back and forth.
Pattern 27: Breathing Effect Make the LEDs “breathe” by gradually brightening and dimming.
Pattern 28: Alternating Binary and One-Hot Switch between binary counting and one-hot encoding.
Pattern 29: Alternating LFSR and One-Hot Alternate between the LFSR sequence and one-hot encoding.
Pattern 30: Alternating LFSR and Binary Switch between the LFSR sequence and binary counting.
Pattern 31: DEMO This mode cycles through all the available patterns automatically, showcasing the variety of the patterns.
To test the MPLS module, follow these steps:
To create a simulation displaying all the patterns, run the target “make mpls_sim” in the src folder, this will run the testbench via icarus verilog for all patterns with a fixed time of simulation enough to see the patterns.
There is another target that simulates the PLL and 10MHz to 1Hz, 2Hz, 5Hz and 50Hz with the MPLS module by using “make tt_sim” in the src folder, running this one is not recommended since its meant for long testing and the VCD file can go up to 16GB if you let it run everything.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | N/C | LED[7] | none |
| 1 | pattern_sel[4] | LED[6] | none |
| 2 | pattern_sel[3] | LED[5] | none |
| 3 | pattern_sel[2] | LED[4] | none |
| 4 | pattern_sel[1] | LED[3] | none |
| 5 | pattern_sel[0] | LED[2] | none |
| 6 | clk_selector[1] | LED[1] | none |
| 7 | clk_selector[0] | LED[0] | none |