Colorduino plasma demo, matrix test and browser simulator

- ColorduinoPlasma sketch and Colorduino library v1.2.6 (lincomatic @ fff7bd3) - ColorduinoMatrixTest hardware test sketch - web/index.html: bit-accurate port of the plasma with large resolutions - prebuilt 16 MHz firmware (with and without Optiboot) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-11-07 22:28:12 +01:00
commit a18f081e0a
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 build/
 *.elf
 .vscode/
 .claude/
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 That's all there is to it!
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 # colorduino-plasma
 The classic **ColorduinoPlasma** demo for the ITead Colorduino 8×8 RGB LED matrix, plus a
 **browser simulator** that renders the exact same effect on your PC — at the original 8×8 or at
 much higher resolutions.
 ## Contents
 | Path | What |
 |---|---|
 | `arduino/ColorduinoPlasma/` | The plasma demo sketch (from the lincomatic Colorduino library) |
 | `arduino/ColorduinoMatrixTest/` | Hardware test: full colours, row/column scan, per-LED walk, brightness ramps, checkerboard |
 | `libraries/Colorduino/` | Colorduino library v1.2.6 by Sam C. Lin ([lincomatic/Colorduino](https://github.com/lincomatic/Colorduino) @ `fff7bd3`) |
 | `web/index.html` | Browser simulator — open it directly, no server needed |
 | `firmware/` | Prebuilt hex files for ATmega328(P/PB) @ 16 MHz |
 ## Browser simulator
 Open `web/index.html` in any browser.
 It is a straight port of `plasma_morph()` / `HSVtoRGB()` and matches the AVR build bit for bit
 as closely as possible:
 - all maths in 32-bit float (`Math.fround`), like `double` = `float` on AVR
 - the hue cast `(unsigned char)(value * 128)` **wraps negative values** (two's complement),
  which is what avr-libc's `__fixunssfsi` does — clamping to 0 would give a very different image
 - same `gamma8` table, same start value `paletteShift = 128000`
 Controls:
 - **Width / Height** — the plasma is an infinite field; a larger grid shows more of it.
  The Colorduino shows the top-left 8×8 (toggle *Mark 8×8 area*).
 - **Detail** — sub-samples between LED positions, so the same area renders smoothly.
 - **Colour** — *LED light* converts the gamma-corrected PWM values (linear light) to sRGB so it
  looks like the LEDs; *Raw PWM values* shows the bytes sent to the DM163; *Without gamma table*
  skips the gamma lookup.
 - **Speed**, **Rotate**, **LED dots**, pause (Space), step (→), fullscreen (F).
 The board's white balance (`{36, 63, 63}`) is an LED current correction and is not applied on screen.
 ## Building the sketches
 1. Copy `libraries/Colorduino` into your Arduino `libraries` folder
   (e.g. `Documents/Arduino/libraries/Colorduino`).
 2. Open a sketch from `arduino/`, select board **Arduino Uno**, and build.
 With arduino-cli, no install needed:
 ```bash
 arduino-cli compile -b arduino:avr:uno --library libraries/Colorduino arduino/ColorduinoPlasma
 ```
 > The library drives all of PORTD (including RX/TX), so `Serial` can't be used alongside it.
 ## Flashing
 ### Over serial (bootloader present)
 Connect a USB-serial adapter (FTDI-style, with DTR for auto-reset) to the Colorduino's serial
 header and upload as **Arduino Uno** (Optiboot, 115200 baud).
 ### Over ISP (Arduino as ISP)
 A normal ISP write erases the chip, including the bootloader. Flash the combined image to keep it:
 ```bash
 avrdude -p m328pb -c stk500v1 -P COM16 -b 19200 -U flash:w:firmware/ColorduinoPlasma_16MHz_optiboot.hex:i
 ```
 Use `-p m328p` if your board has an ATmega328P (signature `1E 95 0F`) rather than a 328PB
 (`1E 95 16`).
 Fuses used here (16 MHz crystal, 512-byte Optiboot boot section):
 | low | high | extended |
 |---|---|---|
 | `0xFF` | `0xD6` | `0xF5` |
 ## License
 The sketches, the library and the simulator (a port of the sketch) are licensed under the
 GNU LGPL v2.1 or later — see [LICENSE](LICENSE). Original copyrights: Sam C. Lin (Colorduino
 library and demo), Ben Combee, Ken Corey, Windell H. Oskay (color cycling plasma),
 zzy@IteadStudio. The library folder includes its upstream `COPYING` file.
@@ -0,0 +1,111 @@
 /*
  Colorduino 8x8 RGB matrix hardware test
  Needs the Colorduino library (lincomatic).
  Sequence (loops forever):
    1. Full screen: RED, GREEN, BLUE, WHITE        -> dead colour channel / driver (DM163)
    2. Rows one at a time (white)                  -> dead row driver (M54564)
    3. Columns one at a time, R then G then B      -> dead column channel
    4. Every LED one by one, R, G, B each          -> single dead / stuck LEDs
    5. Brightness ramp 0..255 per colour            -> PWM / greyscale problems
    6. Checkerboard + inverse                      -> shorts between neighbours
  Note: Colorduino drives all of PORTD, so Serial cannot be used while it runs.
 */
 #include <Colorduino.h>
 const uint8_t W = ColorduinoScreenWidth;
 const uint8_t H = ColorduinoScreenHeight;
 void show() { Colorduino.FlipPage(); }
 void fill(uint8_t r, uint8_t g, uint8_t b) {
  Colorduino.ColorFill(r, g, b);   // ColorFill flips the page itself
 }
 void clearBuf() {
  for (uint8_t y = 0; y < H; y++)
    for (uint8_t x = 0; x < W; x++)
      Colorduino.SetPixel(x, y, 0, 0, 0);
 }
 void fullColours() {
  fill(255, 0, 0);   delay(1500);
  fill(0, 255, 0);   delay(1500);
  fill(0, 0, 255);   delay(1500);
  fill(255, 255, 255); delay(1500);
  fill(0, 0, 0);     delay(300);
 }
 void rowScan() {
  for (uint8_t y = 0; y < H; y++) {
    clearBuf();
    for (uint8_t x = 0; x < W; x++) Colorduino.SetPixel(x, y, 255, 255, 255);
    show();
    delay(400);
  }
 }
 void columnScan() {
  const uint8_t cols[3][3] = {{255, 0, 0}, {0, 255, 0}, {0, 0, 255}};
  for (uint8_t c = 0; c < 3; c++) {
    for (uint8_t x = 0; x < W; x++) {
      clearBuf();
      for (uint8_t y = 0; y < H; y++)
        Colorduino.SetPixel(x, y, cols[c][0], cols[c][1], cols[c][2]);
      show();
      delay(250);
    }
  }
 }
 void pixelWalk() {
  for (uint8_t y = 0; y < H; y++) {
    for (uint8_t x = 0; x < W; x++) {
      clearBuf(); Colorduino.SetPixel(x, y, 255, 0, 0); show(); delay(120);
      clearBuf(); Colorduino.SetPixel(x, y, 0, 255, 0); show(); delay(120);
      clearBuf(); Colorduino.SetPixel(x, y, 0, 0, 255); show(); delay(120);
    }
  }
 }
 void ramps() {
  for (uint8_t c = 0; c < 4; c++) {
    for (int v = 0; v <= 255; v += 3) {
      uint8_t r = (c == 0 || c == 3) ? v : 0;
      uint8_t g = (c == 1 || c == 3) ? v : 0;
      uint8_t b = (c == 2 || c == 3) ? v : 0;
      fill(r, g, b);
      delay(12);
    }
  }
 }
 void checker() {
  for (uint8_t i = 0; i < 6; i++) {
    for (uint8_t y = 0; y < H; y++)
      for (uint8_t x = 0; x < W; x++) {
        bool on = ((x + y + i) & 1);
        Colorduino.SetPixel(x, y, on ? 255 : 0, on ? 255 : 0, on ? 255 : 0);
      }
    show();
    delay(500);
  }
 }
 void setup() {
  Colorduino.Init();
  // white balance (R, G, B), 0..63 - same default as the Plasma example
  unsigned char whiteBal[3] = {36, 63, 63};
  Colorduino.SetWhiteBal(whiteBal);
 }
 void loop() {
  fullColours();
  rowScan();
  columnScan();
  pixelWalk();
  ramps();
  checker();
 }
@@ -0,0 +1,202 @@
 	/*
  ColorduinoPlasma - Plasma demo using Colorduino Library for Arduino
  Copyright (c) 2011 Sam C. Lin lincomatic@hotmail.com ALL RIGHTS RESERVED
  based on  Color cycling plasma   
    Version 0.1 - 8 July 2009
    Copyright (c) 2009 Ben Combee.  All right reserved.
    Copyright (c) 2009 Ken Corey.  All right reserved.
    Copyright (c) 2008 Windell H. Oskay.  All right reserved.
    Copyright (c) 2011 Sam C. Lin All Rights Reserved
  This demo is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  This demo is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 #include <Colorduino.h>
 // To show off our hardware PWM LED driver (capable of displaying 16M colors), 
 // we will add gamma correction to show more accurate colors, and we will 
 // see better color transition.
 #include "gamma8.h"   
 typedef struct
 {
  unsigned char r;
  unsigned char g;
  unsigned char b;
 } ColorRGB;
 //a color with 3 components: h, s and v
 typedef struct 
 {
  unsigned char h;
  unsigned char s;
  unsigned char v;
 } ColorHSV;
 // increase the scaling of the plasma to see more details of the color transition.
 const float PlasmaScaling = 10.0; 
 unsigned char plasma[ColorduinoScreenWidth][ColorduinoScreenHeight];
 long paletteShift;
 //Converts an HSV color to RGB color
 void HSVtoRGB(void *vRGB, void *vHSV) 
 {
  float r, g, b, h, s, v; //this function works with floats between 0 and 1
  float f, p, q, t;
  int i;
  ColorRGB *colorRGB=(ColorRGB *)vRGB;
  ColorHSV *colorHSV=(ColorHSV *)vHSV;
  h = (float)(colorHSV->h / 256.0);
  s = (float)(colorHSV->s / 256.0);
  v = (float)(colorHSV->v / 256.0);
  //if saturation is 0, the color is a shade of grey
  if(s == 0.0) {
    b = v;
    g = b;
    r = g;
  }
  //if saturation > 0, more complex calculations are needed
  else
  {
    h *= 6.0; //to bring hue to a number between 0 and 6, better for the calculations
    i = (int)(floor(h)); //e.g. 2.7 becomes 2 and 3.01 becomes 3 or 4.9999 becomes 4
    f = h - i;//the fractional part of h
    p = (float)(v * (1.0 - s));
    q = (float)(v * (1.0 - (s * f)));
    t = (float)(v * (1.0 - (s * (1.0 - f))));
    switch(i)
    {
      case 0: r=v; g=t; b=p; break;
      case 1: r=q; g=v; b=p; break;
      case 2: r=p; g=v; b=t; break;
      case 3: r=p; g=q; b=v; break;
      case 4: r=t; g=p; b=v; break;
      case 5: r=v; g=p; b=q; break;
      default: r = g = b = 0; break;
    }
  }
  colorRGB->r = (int)(r * 255.0);
  colorRGB->g = (int)(g * 255.0);
  colorRGB->b = (int)(b * 255.0);
  // gamma correction
  colorRGB->r = pgm_read_byte(&gamma8[colorRGB->r]);
  colorRGB->g = pgm_read_byte(&gamma8[colorRGB->g]);
  colorRGB->b = pgm_read_byte(&gamma8[colorRGB->b]);
 }
 float
 dist(float a, float b, float c, float d) 
 {
  return sqrt((c-a)*(c-a)+(d-b)*(d-b));
 }
 void
 plasma_morph()
 {
  unsigned char x,y;
  float value;
  ColorRGB colorRGB;
  ColorHSV colorHSV;
  for(y = 0; y < ColorduinoScreenHeight; y++)
    for(x = 0; x < ColorduinoScreenWidth; x++) {
      {
 	value = sin((x + paletteShift) / PlasmaScaling)
 	  + sin(dist(x, y, 64.0, 64.0) / PlasmaScaling)
 	  + sin((y + paletteShift / 7.0) / PlasmaScaling)
 	  + sin(dist(x, y, 192.0, 100.0) / PlasmaScaling);
 	colorHSV.h=(unsigned char)((value) * 128)&0xff;
 	colorHSV.s=255; 
 	colorHSV.v=255;
 	HSVtoRGB(&colorRGB, &colorHSV);
 	Colorduino.SetPixel(x, y, colorRGB.r, colorRGB.g, colorRGB.b);
      }
  }
  paletteShift++;
  Colorduino.FlipPage(); // swap screen buffers to show it
 }
 /********************************************************
 Name: ColorFill
 Function: Fill the frame with a color
 Parameter:R: the value of RED.   Range:RED 0~255
          G: the value of GREEN. Range:RED 0~255
          B: the value of BLUE.  Range:RED 0~255
 ********************************************************/
 void ColorFill(unsigned char R,unsigned char G,unsigned char B)
 {
  PixelRGB *p = Colorduino.GetPixel(0,0);
  for (unsigned char y=0;y<ColorduinoScreenWidth;y++) {
    for(unsigned char x=0;x<ColorduinoScreenHeight;x++) {
      p->r = R;
      p->g = G;
      p->b = B;
      p++;
    }
  }
  Colorduino.FlipPage();
 }
 void setup()
 {
  Colorduino.Init(); // initialize the board
  // compensate for relative intensity differences in R/G/B brightness
  // array of 6-bit base values for RGB (0~63)
  // whiteBalVal[0]=red
  // whiteBalVal[1]=green
  // whiteBalVal[2]=blue
  unsigned char whiteBalVal[3] = {36,63,63}; // for LEDSEE 6x6cm round matrix
  Colorduino.SetWhiteBal(whiteBalVal);
  // start with morphing plasma, but allow going to color cycling if desired.
  paletteShift=128000;
  unsigned char bcolor;
  //generate the plasma once
  for(unsigned char y = 0; y < ColorduinoScreenHeight; y++)
    for(unsigned char x = 0; x < ColorduinoScreenWidth; x++)
    {
      //the plasma buffer is a sum of sines
      bcolor = (unsigned char)
      (
            128.0 + (128.0 * sin(x*8.0 / 16.0))
          + 128.0 + (128.0 * sin(y*8.0 / 16.0))
      ) / 2;
      plasma[x][y] = bcolor;
    }
 // to adjust white balance you can uncomment this line
 // and comment out the plasma_morph() in loop()
 // and then experiment with whiteBalVal above
 // ColorFill(255,255,255);
 }
 void loop()
 {
  plasma_morph();
 }
@@ -0,0 +1,25 @@
 // A simple gamma look-up-table, stored in Program Memory
 // To access the table, must use: pgm_read_byte()
 #ifndef _INC_GAMMA8_H_
 #define _INC_GAMMA8_H_
 const uint8_t PROGMEM gamma8[] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  1,  1,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,  2,
    2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  5,  5,  5,
    5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  9,  9,  9, 10,
   10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
   17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
   25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
   37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
   51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
   69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
   90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
  115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
  144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
  177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
  215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
  #endif
@@ -0,0 +1,274 @@
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                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007
 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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  12. No Surrender of Others' Freedom.
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  13. Use with the GNU Affero General Public License.
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  14. Revised Versions of this License.
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 EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
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  17. Interpretation of Sections 15 and 16.
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  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
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    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 Also add information on how to contact you by electronic and paper mail.
  If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:
    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, your program's commands
 might be different; for a GUI interface, you would use an "about box".
  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
 <http://www.gnu.org/licenses/>.
  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <http://www.gnu.org/philosophy/why-not-lgpl.html>.
@@ -0,0 +1,9 @@
 Arduino Interface Library for ITeadStudio Colorduino and Colors Shield
 Copyright (c) 2011-2016 Sam C. Lin <lincomatic@hotmail.com>
 To install, copy libraries/Colorduino to your <arduino sketchbook folder>/libraries/Colorduino folder.
 ColorduinoPlasma.pde is a sample program which uses the library.  It displays an animated plasma on an 8x8 LED matrix
 NOTE: Later versions of Arduino make the library run slowly. It's easy to see because ColorduinoPlasma runs slowly in a step-like version. I'm not sure which version triggers the slowdown, but my testing with Arduino 1.6.3 -> 1.8.1 all exhibit the slowdown. Arduino 1.0.2 runs full speed
 Modified: Removed the inefficient digitalPinToBitMask() and digitalPinToPort(), which was causing the sketch to run very slow if compiled by later versions of Arduino. 
@@ -0,0 +1,10 @@
 name=Colorduino
 version=1.2.6
 author=Sam C. Lin <lincomatic@hotmail.com>
 maintainer=Sam C. Lin <lincomatic@hotmail.com>
 sentence=Arduino Interface Library for ITeadStudio Colorduino and Colors Shield
 paragraph=Arduino Interface Library for ITeadStudio Colorduino and Colors Shield
 category=Display
 url=https://github.com/lincomatic/Colorduino
 architectures=avr
 includes=Colorduino.h
@@ -0,0 +1,193 @@
 /*
  Colorduino - Colorduino Library for Arduino
  Copyright (c) 2011-2012 Sam C. Lin <lincomatic@hotmail.com>
  based on C code by zzy@iteadstudio
    Copyright (c) 2010 zzy@IteadStudio.  All right reserved.
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 #include "Colorduino.h"
 void ColorduinoObject::LED_Delay(unsigned char i)
 {
  unsigned int y;
  y = i * 10;
  while(y--);
 }
 // compensate for relative intensity differences in R/G/B brightness
 // array of 6-bit base values for RGB (0~63)
 // wbval[0]=red
 // wbval[1]=green
 // wbval[2]=blue
 void ColorduinoObject::SetWhiteBal(unsigned char wbval[3])
 {
  cli();  // must not allow ISR to come in now, will screw up timing!
  LED_LAT_CLR;
  LED_SLB_CLR;
  for(unsigned char k=0;k<ColorduinoScreenHeight;k++)
    for(unsigned char i = 3;i > 0 ;i--)
    {
      unsigned char temp = wbval[i-1]<<2;
      for(unsigned char j = 0;j<6;j++)
      {
        if(temp &0x80)
          LED_SDA_SET;
        else
          LED_SDA_CLR;
        temp =temp << 1;
        LED_SCL_CLR;
        LED_SCL_SET;
    }
  }
  LED_SLB_SET;
  sei();  // safe to re-enable ISR
 }
 /********************************************************
 Name: ColorFill
 Function: Fill the frame with a color
 Parameter:R: the value of RED.   Range:RED 0~255
          G: the value of GREEN. Range:RED 0~255
          B: the value of BLUE.  Range:RED 0~255
 ********************************************************/
 void ColorduinoObject::ColorFill(unsigned char R,unsigned char G,unsigned char B)
 {
  PixelRGB *p = GetPixel(0,0);
  for (unsigned char y=0;y<ColorduinoScreenWidth;y++) {
    for(unsigned char x=0;x<ColorduinoScreenHeight;x++) {
      p->r = R;
      p->g = G;
      p->b = B;
      p++;
    }
  }
  FlipPage();
 }
 // ISR fires every 256-TCNTn ticks
 // if TCNTn = 100, ISR fires every 156 ticks
 // prescaler = 128 so ISR fires every 16MHz / 128 = 125KHz
 // 125KHz / 156 = 801.282Hz / 8 rows = 100.16Hz refresh rate
 // if TCNTn = 61, ISR fires every 256 - 61 = 195 ticks
 // 125KHz / 195 = 641.026Hz / 8 rows = 80.128Hz refresh rate
 unsigned char timerCounter;
 void ColorduinoObject::SetTimerCounter(unsigned char data)
 {
  timerCounter = data;
 }
 #if defined (__AVR_ATmega32U4__)
 ISR(TIMER4_OVF_vect)          //Timer4  Service 
 {  
  //ISR fires every 256-TCNT4 ticks
  //so if TCNT4 = 100, ISR fires every 156 ticks
  //prescaler = 128 so ISR fires every 16MHz / 128 = 125KHz
  //125KHz / 156 = 801.282Hz / 8 rows = 100.16Hz refresh rate
  //if TCNT4 = 61, ISR fires every 256 - 61 = 195 ticks
  //125KHz / 195 = 641.026Hz / 8 rows = 80.128Hz refresh rate
  //TCNT4 = 100;
  TCNT4 = timerCounter;
  close_all_lines;  
  Colorduino.run();
  Colorduino.open_line(Colorduino.line);
  if (++Colorduino.line > 7) Colorduino.line = 0;
 }
 #else
 ISR(TIMER2_OVF_vect)          //Timer2  Service 
 { 
 // ISR fires every 256-TCNT2 ticks
 // so if TCNT2 = 100, ISR fires every 156 ticks
 // prescaler = 128 so ISR fires every 16MHz / 128 = 125KHz
 // 125KHz / 156 = 801.282Hz / 8 rows = 100.16Hz refresh rate
 // if TCNT2 = 61, ISR fires every 256 - 61 = 195 ticks
 // 125KHz / 195 = 641.026Hz / 8 rows = 80.128Hz refresh rate
  //  TCNT2 = 100;
  TCNT2 = timerCounter;
  close_all_lines;  
  Colorduino.run();
  Colorduino.open_line(Colorduino.line);
  if (++Colorduino.line > 7) Colorduino.line = 0;
 }
 #endif
 /****************************************************
 the LED Hardware operate functions zone
 ****************************************************/
 /***************************************************
 the LED datas operate functions zone
 ***************************************************/
 void ColorduinoObject::run()
 {
  LED_SLB_SET;
  LED_LAT_CLR;
  // Inside the LED driver. Channel 23 is the last shift register so we should  
  // start with column 7B-7G-7R... and ...1B-1G-1R last
 #if defined (REVERSE_ROWCHANNELS)
  PixelRGB *pixel = GetDrawPixel(0,line);
 #else
  PixelRGB *pixel = GetDrawPixel(ColorduinoScreenWidth-1,line);
 #endif
  for(unsigned char x=0;x<ColorduinoScreenWidth;x++)
  {
    unsigned char temp = pixel->b;
    unsigned char p;
    for(p=0;p<ColorduinoBitsPerColor;p++) {
      if(temp & 0x80)
 	LED_SDA_SET;
      else
 	LED_SDA_CLR;
      temp <<= 1;  
      LED_SCL_CLR;
      LED_SCL_SET;
    }
    temp = pixel->g;
    for(p=0;p<ColorduinoBitsPerColor;p++) {
      if(temp & 0x80)
 	LED_SDA_SET;
      else
 	LED_SDA_CLR;
      temp <<= 1;  
      LED_SCL_CLR;
      LED_SCL_SET;
    }
    temp = pixel->r;
    for(p=0;p<ColorduinoBitsPerColor;p++) {
      if(temp & 0x80)
 	LED_SDA_SET;
      else
 	LED_SDA_CLR;
      temp <<= 1;  
      LED_SCL_CLR;
      LED_SCL_SET;
    }
 #if defined (REVERSE_ROWCHANNELS)
    pixel++;
 #else
    pixel--;
 #endif
  }
  LED_LAT_SET;
  LED_LAT_CLR;
 }
 // global instance
 ColorduinoObject Colorduino;
@@ -0,0 +1,349 @@
 /*
  Colorduino - Colorduino Library for Arduino
  Copyright (c) 2011-2016 Sam C. Lin <lincomatic@hotmail.com>
  based on C code by zzy@iteadstudio
  Copyright (c) 2010 zzy@IteadStudio.  All right reserved.
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 #ifndef _COLORDUINO_H_
 #define _COLORDUINO_H_
 #if defined(ARDUINO) && ARDUINO >= 100
 #include "Arduino.h"
 #else
 #include "WProgram.h"
 #include "pins_arduino.h"
 #endif
 #include <avr/pgmspace.h> 
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #define ColorduinoBitsPerColor 8
 #define ColorduinoScreenWidth 8
 #define ColorduinoScreenHeight 8
 //#define REVERSE_ROWCHANNELS
 /*****************************
 define the IO
 *****************************/
 //
 // Removed all the inefficient digitalPinToBitMask() and 
 // digitalPinToPort(), replaced with direct PORT and bit mapping
 //
 #if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
 #define RST PORTF // A2 = PF2
 #define RST_BIT 0x04
 #define LAT PORTF // A1 = PF1
 #define LAT_BIT 0x02
 #define SLB PORTF // A0 = PF0
 #define SLB_BIT 0x01
 #define SCL PORTH // D6 = PH3
 #define SCL_BIT 0x08
 #define SDA PORTH // D7 = PH4
 #define SDA_BIT 0x10
 #define open_line0	{PORTH=0x20;} // D8 = PH5
 #define open_line1	{PORTH=0x40;} // D9 = PH6
 #define open_line2	{PORTB=0x10;} // D10 = PB4
 #define open_line3	{PORTB=0x20;} // D11 = PB5
 #define open_line4	{PORTB=0x40;} // D12 = PB6
 #define open_line5	{PORTB=0x80;} // D13 = PB7
 #define open_line6	{PORTE=0x20;} // D3 = PE5
 #define open_line7	{PORTG=0x20;} // D4 = PG5
 #define close_all_lines	{PORTH=0x00;PORTB=0x00;PORTE=0x00;PORTG=0x00;}
 #elif defined(__AVR_ATmega32U4__)
 #define RST PORTF // A2 = PF5
 #define RST_BIT 0x20
 #define LAT PORTF // A1 = PF6
 #define LAT_BIT 0x40
 #define SLB PORTF // A0 = PF7
 #define SLB_BIT 0x80
 #define SCL PORTD // D6 = PD7
 #define SCL_BIT 0x80
 #define SDA PORTE // D7 = PE6
 #define SDA_BIT 0x40
 #define open_line0	{PORTB=0x10;} // D8 = PB4
 #define open_line1	{PORTB=0x20;} // D9 = PB5
 #define open_line2	{PORTB=0x40;} // D10 = PB6
 #define open_line3	{PORTB=0x80;} // D11 = PB7
 #define open_line4	{PORTD=0x40;} // D12 = PD6
 #define open_line5	{PORTC=0x80;} // D13 = PC7
 #define open_line6	{PORTD=0x01;} // D3 = PD0
 #define open_line7	{PORTD=0x10;} // D4 = PD4
 #define close_all_lines	{PORTB=0x00;PORTD=0x00;PORTC=0x00;}
 #else // 328/168
 #define RST PORTC // A2 = PC2
 #define RST_BIT 0x04
 #define LAT PORTC // A1 = PC1
 #define LAT_BIT 0x02
 #define SLB PORTC // A0 = PC0
 #define SLB_BIT 0x01
 #define SCL PORTD // D6 = PD6
 #define SCL_BIT 0x40
 #define SDA PORTD // D7 = PD7
 #define SDA_BIT 0x80
 #define open_line0	{PORTB=0x01;} // D8 = PB0
 #define open_line1	{PORTB=0x02;} // D9 = PB1
 #define open_line2	{PORTB=0x04;} // D10 = PB2
 #define open_line3	{PORTB=0x08;} // D11 = PB3
 #define open_line4	{PORTB=0x10;} // D12 = PB4
 #define open_line5	{PORTB=0x20;} // D13 = PB5
 #define open_line6	{PORTD=0x08;} // D3 = PD3
 #define open_line7	{PORTD=0x10;} // D4 = PD4
 #define close_all_lines	{PORTD=0x00;PORTB=0x00;}
 #endif  // defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
 #define LED_RST_SET RST|=RST_BIT
 #define LED_RST_CLR RST&=~RST_BIT
 #define LED_SDA_SET SDA|=SDA_BIT
 #define LED_SDA_CLR SDA&=~SDA_BIT
 #define LED_SCL_SET SCL|=SCL_BIT
 #define LED_SCL_CLR SCL&=~SCL_BIT
 #define LED_LAT_SET LAT|=LAT_BIT
 #define LED_LAT_CLR LAT&=~LAT_BIT
 #define LED_SLB_SET SLB|=SLB_BIT
 #define LED_SLB_CLR SLB&=~SLB_BIT
 typedef struct pixelRGB {
  unsigned char r;
  unsigned char g;
  unsigned char b;
 } PixelRGB;
 class ColorduinoObject {
 public:
  PixelRGB frameBuffer0[ColorduinoScreenWidth*ColorduinoScreenHeight];
  PixelRGB frameBuffer1[ColorduinoScreenWidth*ColorduinoScreenHeight];
  PixelRGB *curDrawFrame;
  PixelRGB *curWriteFrame;
  unsigned char line;
  ColorduinoObject() {
    line = 0;
    curWriteFrame = frameBuffer0;
    curDrawFrame = frameBuffer1;
  }
  void _IO_Init()
    {
 #if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
    DDRF = 0xff;
    DDRH = 0xff;
    DDRB = 0xff;
    DDRE = 0xff;
    DDRG = 0xff;
    PORTF = 0x00;
    PORTH = 0x00;  
    PORTB = 0x00;
    PORTE = 0x00;
    PORTG = 0x00;
 #elif defined(__AVR_ATmega328__) || defined(__AVR_ATmega168__)
    DDRD = 0xff; // set all pins direction of PortD
    DDRC = 0xff; // set all pins direction of PortC
    DDRB = 0xff; // set all pins direction of PortB
    PORTD = 0x00; // set all pins output is low of PortD
    PORTC = 0x00; // set all pins output is low of PortC
    PORTB = 0x00; // set all pins output is low of PortB
 #else
      uint8_t lines[] = {A0,A1,A2,3,4,6,7,8,9,10,11,12,13};
      for(int i = 0; i < 13;i++){
    	pinMode(lines[i],OUTPUT);
    	digitalWrite(lines[i],LOW);
      }
 #endif
    }
  void LED_Delay(unsigned char i);
  void SetWhiteBal(unsigned char wbval[3]);
  void _LED_Init()
    {
      LED_RST_SET;
      LED_Delay(1);
      LED_RST_CLR;
      LED_Delay(1);
      LED_RST_SET;
      LED_Delay(1);
      line = 0;
    }
  void _TC2_Init()
    {
      // Arduino runs at 16 Mhz...
      // Timer Settings, for the Timer Control Register etc. , thank you internets. ATmega168 !
      // Timer2 (8bit) Settings:
      // prescaler (frequency divider) values:   CS22    CS21   CS20
      //                                           0       0      0    stopped
      //                                           0       0      1      /1 
      //                                           0       1      0      /8 
      //                                           0       1      1      /32
      //                                           1       0      0      /64 
      //                                           1       0      1      /128
      //                                           1       1      0      /256
      //                                           1       1      1      /1024
      // TCNT2 increments every  = 16MHz / prescaler
 #if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
      TCCR2B = 0x00; // Disable timer while configuring
      TCCR2A = 0x00; // Use normal mode
      TIMSK2 = 0x01; // Timer2 overflow interrupt enable
      TCNT2  = 0xff; // Reset timer to count of 255
      TCCR2B = 0x05; // Prescaler = 128
 #elif defined(__AVR_ATmega32U4__)
      // set prescaler to 128 -> TCNT2 freq = 125KHz
      //TCCR4B |= (1<<CS43);
      //TCCR4B &= ~((1<<CS42)|(1<<CS41)|(1<<CS40));
      TCCR4B |= ((1<<CS42)|(1<<CS41)|(1<<CS40));
      TCCR4C &= ~(1<<PWM4D);
      //TCCR4D &= ~((1<<WGM41)|(1<<WGM40));   // Use normal mode
      TCCR4A &= ~((1<<COM4A1)|(1<<COM4A0));		// Use normal mode
      TIMSK4 |= (1<<TOIE4);      //Timer4D Overflow Interrupt Enable
      TIFR4 |= (1<<TOV4);
      OCR4C = 0xff;
      TCNT4 = 0xff;
 #else
      // set prescaler to 128 -> TCNT2 freq = 125KHz
      TCCR2B |= ((1<<CS22)|(1<<CS20));
      TCCR2B &= ~((1<<CS21));   
      TCCR2A &= ~((1<<WGM21) | (1<<WGM20));   // Use normal mode
      ASSR |= (1<<AS2);       // Use internal clock - external clock not used in Arduino
      TIMSK2 |= ((1<<TOIE2) | (0<<OCIE2B));   //Timer2 Overflow Interrupt Enable
      TCNT2 = 0xff;
 #endif
      // TCNTn=99, ISR fires every 256-99 = 157 ticks, 125KHz/157 = 796.2Hz/8 rows = 99.5Hz refresh rate
      SetTimerCounter(99);
      sei();
    }
  void open_line(unsigned char x)
    {
      switch (x)
 	{  
 	case 0 :open_line0;
 	  break;
 	case 1 :open_line1;
 	  break;
 	case 2 :open_line2;
 	  break;
 	case 3 :open_line3;
 	  break;
 	case 4 :open_line4;
 	  break;
 	case 5 :open_line5;
 	  break;
 	case 6 :open_line6;
 	  break;
 	case 7 :open_line7;
 	  break;
 	default: close_all_lines;
 	  break;
 	}
    }
  void Init() {
    _IO_Init();           //Init IO
    _LED_Init();          //Init LED Hardware
    _TC2_Init();          //Init Timer/Count2
  }
  void FlipPage() {
    cli();
    // swap frame buffers
    PixelRGB *tmp = curDrawFrame;
    curDrawFrame = curWriteFrame;
    curWriteFrame = tmp;
    sei();
  }
  // get a pixel for writing in the offscreen framebuffer, return null if out of screen
  PixelRGB *GetPixel(char x, char y) {
    if ( x < 0 || x >= ColorduinoScreenWidth ||
         y < 0 || y >= ColorduinoScreenHeight ) 
    {
      return NULL;
    }
    return curWriteFrame + (y * ColorduinoScreenWidth) + x;
  }
  // get a pixel from the active framebuffer, return null if out of screen
  PixelRGB *GetDrawPixel(char x, char y) {
    if ( x < 0 || x >= ColorduinoScreenWidth ||
         y < 0 || y >= ColorduinoScreenHeight ) 
    {
      return NULL;
    }
    return curDrawFrame + (y * ColorduinoScreenWidth) + x;
  }
  // set a pixel in the offscreen frame buffer
  void SetPixel(char x, char y, unsigned char r, unsigned char g, unsigned char b) {
    PixelRGB *p = GetPixel(x,y);
    if (p) {
      p->r = r;
      p->g = g;
      p->b = b;
    }
  }
  // set a pixel in the offscreen frame buffer
  void SetPixel(char x, char y, const PixelRGB & color) {
    PixelRGB * p = GetPixel(x,y);
    if (p) {
      *p = color;
    }
  }
 /********************************************************
 Name: ColorFill
 Function: Fill the frame with a color
 Parameter:R: the value of RED.   Range:RED 0~255
          G: the value of GREEN. Range:RED 0~255
          B: the value of BLUE.  Range:RED 0~255
 ********************************************************/
  void ColorFill(unsigned char R,unsigned char G,unsigned char B);
 /********************************************************
 Name: SetTimerCounter(unsigned char data)
 Function: Set the TimerCounter variable.
          ISR fires every 256-TCNTn ticks
 Parameter:data=loaded into TCNTn at the end of ISR
 ********************************************************/
  void SetTimerCounter(unsigned char data);
  void run();
 };
 extern ColorduinoObject Colorduino;
 #endif // _COLORDUINO_H_
@@ -0,0 +1,42 @@
 2018/09/07 DC v1.2.7
 - Colorduino.h - Remove all the inefficient digitalPinToBitMask() and digitalPinToPort(), 
  which was causing the sketch to run very slow if compiled by later versions of Arduino.
 - Colorduino.cpp - Disable interrupts inside SetWhiteBal(), so the timer ISR can’t
  come in at the same time, it will screw up the control signal timing.
 - Add a function to change the interrupt timer counter
 - Origin (0,0) is bottom left corner. When we update the LED driver in run(), channel 23 is 
  the last shift register so we should start with column 7B-7G-7R... and ...1B-1G-1R last
  You can use the REVERSE_ROWCHANNELS define to flip the columns.
 2016/12/12 SCL v1.2.6
 - Colorduino.h - fix C99 warning
 2016/12/12 SCL v1.2.5
 - merged sbouba PR#9 - limit check Get/Set functions
 - change 0 to NULL
 2012/07/12 SCL v1.2.4
 fixed bug in Mega support introduced in 1.2.3 (thanks wiltwong!)
 fixed a bug in close_lines() in Leonardo code (thanks Markus Lange)
 2012/07/11 SCL v1.2.3
 added Leonardo support (thanks to Markus Lange)
 added ColorFill() to library
 2012/07/07 SCL v1.2.2
 added Mega support (merged from wiltwong)
 2012/06/07 SCL v1.2.1
 fix compilation errors for Arduino v1.x
 2011/03/10 SCL lincomatic@hotmail.com v1.2
 take out superfluous cli/sei in ISR
 take out superfluous     TCCR2A |= (1 << WGM21) | (1 << WGM20);   in _T2C_Init()
 lower screen refresh rate from 100Hz to 80Hz
 2011/03/06 SCL lincomatic@hotmail.com v1.1
 fixed bugs in coordinate system.  origin (0,0) is bottom left corner
 rearranged frame buffer for better performance
 2011/03/04 SCL lincomatic@hotmail.com v1.0
 Initial Release
@@ -0,0 +1,316 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
 <meta charset="utf-8">
 <title>Colorduino Plasma</title>
 <style>
  :root { color-scheme: dark; }
  * { box-sizing: border-box; }
  body { margin: 0; background: #0b0b0d; color: #ddd; font: 14px/1.4 system-ui, sans-serif;
         display: flex; flex-direction: column; height: 100vh; }
  header { display: flex; flex-wrap: wrap; gap: 14px 18px; align-items: end; padding: 10px 14px;
           background: #16161a; border-bottom: 1px solid #2a2a30; }
  label { display: flex; flex-direction: column; gap: 3px; font-size: 12px; color: #9a9aa5; }
  label.inline { flex-direction: row; align-items: center; gap: 6px; color: #ddd; font-size: 13px; }
  input[type=number] { width: 78px; }
  input, select, button { font: inherit; background: #222228; color: #eee; border: 1px solid #3a3a44;
                          border-radius: 6px; padding: 4px 8px; }
  button { cursor: pointer; }
  button:hover { background: #2d2d35; }
  .group { display: flex; gap: 6px; align-items: end; }
  #stage { flex: 1; display: flex; align-items: center; justify-content: center; overflow: hidden; padding: 12px; }
  canvas { image-rendering: pixelated; }
  footer { padding: 6px 14px; font-size: 12px; color: #777; background: #16161a; border-top: 1px solid #2a2a30;
           display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
  .val { color: #ccc; font-variant-numeric: tabular-nums; }
 </style>
 </head>
 <body>
 <header>
  <div class="group">
    <label>Preset
      <select id="preset">
        <option value="8,8,1">8×8 Colorduino</option>
        <option value="8,8,32">8×8 area, 32× detail</option>
        <option value="32,32,1">32×32</option>
        <option value="64,64,1">64×64</option>
        <option value="128,72,1">128×72</option>
        <option value="256,256,1">256×256 field</option>
        <option value="64,36,8">64×36, 8× detail</option>
        <option value="">Custom</option>
      </select>
    </label>
  </div>
  <label>Width (px)<input id="w" type="number" min="1" max="1024" value="8"></label>
  <label>Height (px)<input id="h" type="number" min="1" max="1024" value="8"></label>
  <label>Detail
    <select id="detail">
      <option>1</option><option>2</option><option>4</option><option>8</option>
      <option>16</option><option>32</option><option>64</option>
    </select>
  </label>
  <label>Speed (frames/s) <span class="val" id="fpsv"></span>
    <input id="fps" type="range" min="1" max="60" value="12">
  </label>
  <label>Colour
    <select id="cmode">
      <option value="led">LED light (gamma table → screen)</option>
      <option value="raw">Raw PWM values</option>
      <option value="nogamma">Without gamma table</option>
    </select>
  </label>
  <label>Rotate
    <select id="rot"><option>0</option><option>90</option><option>180</option><option>270</option></select>
  </label>
  <label class="inline"><input id="led" type="checkbox" checked> LED dots</label>
  <label class="inline"><input id="outline" type="checkbox"> Mark 8×8 area</label>
  <div class="group">
    <button id="play">Pause</button>
    <button id="step">Step</button>
    <button id="reset">Reset</button>
    <button id="fs">Fullscreen</button>
  </div>
 </header>
 <div id="stage"><canvas id="c"></canvas></div>
 <footer>
  <span>paletteShift <span class="val" id="shift"></span> · samples <span class="val" id="samples"></span> · render <span class="val" id="ms"></span></span>
  <span>Space = pause · → = step · F = fullscreen</span>
 </footer>
 <script>
 "use strict";
 /* Port of ColorduinoPlasma (lincomatic Colorduino library), maths matched to
   the ATmega328 build: 32-bit float everywhere (Math.fround), float->unsigned
   char conversion wraps negatives (avr-libc __fixunssfsi), gamma8 table. */
 const F = Math.fround;
 const PlasmaScaling = F(10.0);
 const START_SHIFT = 128000;
 const gamma8 = [
  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,
  1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,4,4,4,4,4,5,5,5,
  5,6,6,6,6,7,7,7,7,8,8,8,9,9,9,10,10,10,11,11,11,12,12,13,13,13,14,14,15,15,16,16,
  17,17,18,18,19,19,20,20,21,21,22,22,23,24,24,25,25,26,27,27,28,29,29,30,31,32,32,33,34,35,35,36,
  37,38,39,39,40,41,42,43,44,45,46,47,48,49,50,50,51,52,54,55,56,57,58,59,60,61,62,63,64,66,67,68,
  69,70,72,73,74,75,77,78,79,81,82,83,85,86,87,89,90,92,93,95,96,98,99,101,102,104,105,107,109,110,112,114,
  115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
  177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255
 ];
 /* HSVtoRGB from the sketch, s = v = 255. Returns pre-gamma 0..255 values. */
 function hsvToRgb(hByte) {
  let h = F(hByte / 256.0);
  const s = F(255 / 256.0), v = F(255 / 256.0);
  h = F(h * 6.0);
  const i = Math.floor(h);
  const f = F(h - i);
  const p = F(v * F(1.0 - s));
  const q = F(v * F(1.0 - F(s * f)));
  const t = F(v * F(1.0 - F(s * F(1.0 - f))));
  let r, g, b;
  switch (i) {
    case 0: r = v; g = t; b = p; break;
    case 1: r = q; g = v; b = p; break;
    case 2: r = p; g = v; b = t; break;
    case 3: r = p; g = q; b = v; break;
    case 4: r = t; g = p; b = v; break;
    case 5: r = v; g = p; b = q; break;
    default: r = g = b = 0;
  }
  return [Math.trunc(F(r * 255.0)), Math.trunc(F(g * 255.0)), Math.trunc(F(b * 255.0))];
 }
 function linToSrgb(l) {
  const s = l <= 0.0031308 ? 12.92 * l : 1.055 * Math.pow(l, 1 / 2.4) - 0.055;
  return Math.round(Math.min(1, Math.max(0, s)) * 255);
 }
 /* The colour depends only on the 8-bit hue, so build a 256-entry palette. */
 const palettes = {};
 for (const mode of ["led", "raw", "nogamma"]) {
  const pal = new Uint32Array(256);
  for (let hb = 0; hb < 256; hb++) {
    let [r, g, b] = hsvToRgb(hb);
    if (mode !== "nogamma") { r = gamma8[r]; g = gamma8[g]; b = gamma8[b]; }
    if (mode === "led") {        // LED light output is linear in PWM duty
      r = linToSrgb(r / 255); g = linToSrgb(g / 255); b = linToSrgb(b / 255);
    }
    pal[hb] = (255 << 24) | (b << 16) | (g << 8) | r;   // little-endian RGBA
  }
  palettes[mode] = pal;
 }
 /* ---------- state & caches ---------- */
 const $ = id => document.getElementById(id);
 const cv = $("c"), ctx = cv.getContext("2d");
 const src = document.createElement("canvas"), sctx = src.getContext("2d");
 let W = 8, H = 8, D = 1, SW = 8, SH = 8;      // logical size, detail, sample grid
 let xs, ys, sDist, img, buf32;                // per-config caches
 let shift = START_SHIFT, playing = true, lastT = 0, acc = 0;
 let mask = null, cell = 1, rotation = 0;
 function setup() {
  W = clampInt($("w").value, 1, 1024);
  H = clampInt($("h").value, 1, 1024);
  D = clampInt($("detail").value, 1, 64);
  // keep the sample count sane
  while (W * D * H * D > 2_000_000 && D > 1) D >>= 1;
  $("detail").value = String(D);
  SW = W * D; SH = H * D;
  xs = new Float32Array(SW); ys = new Float32Array(SH);
  for (let i = 0; i < SW; i++) xs[i] = F(i / D);
  for (let j = 0; j < SH; j++) ys[j] = F(j / D);
  // static part: sin(dist(x,y,64,64)/10) and sin(dist(x,y,192,100)/10)
  sDist = new Float32Array(SW * SH * 2);
  for (let j = 0, k = 0; j < SH; j++) {
    const y = ys[j];
    for (let i = 0; i < SW; i++, k += 2) {
      const x = xs[i];
      sDist[k]     = F(Math.sin(F(dist(x, y, 64.0, 64.0) / PlasmaScaling)));
      sDist[k + 1] = F(Math.sin(F(dist(x, y, 192.0, 100.0) / PlasmaScaling)));
    }
  }
  src.width = SW; src.height = SH;
  img = sctx.createImageData(SW, SH);
  buf32 = new Uint32Array(img.data.buffer);
  $("samples").textContent = `${SW}×${SH}`;
  layout();
 }
 function dist(a, b, c, d) {
  const dx = F(c - a), dy = F(d - b);
  return F(Math.sqrt(F(F(dx * dx) + F(dy * dy))));
 }
 function clampInt(v, lo, hi) { v = parseInt(v, 10); return isNaN(v) ? lo : Math.max(lo, Math.min(hi, v)); }
 /* ---------- plasma_morph() ---------- */
 function computeFrame() {
  const pal = palettes[$("cmode").value];
  const s1 = new Float32Array(SW), s3 = new Float32Array(SH);
  for (let i = 0; i < SW; i++) s1[i] = F(Math.sin(F(F(xs[i] + shift) / PlasmaScaling)));
  const sh7 = F(shift / 7.0);
  for (let j = 0; j < SH; j++) s3[j] = F(Math.sin(F(F(ys[j] + sh7) / PlasmaScaling)));
  for (let j = 0, k = 0, p = 0; j < SH; j++) {
    const c = s3[j];
    for (let i = 0; i < SW; i++, k += 2, p++) {
      const value = F(F(F(s1[i] + sDist[k]) + c) + sDist[k + 1]);
      buf32[p] = pal[Math.trunc(F(value * 128)) & 0xff];
    }
  }
  sctx.putImageData(img, 0, 0);
 }
 /* ---------- display ---------- */
 function layout() {
  rotation = parseInt($("rot").value, 10);
  const rotated = rotation === 90 || rotation === 270;
  const lw = rotated ? H : W, lh = rotated ? W : H;
  const st = $("stage");
  const availW = st.clientWidth - 24, availH = st.clientHeight - 24;
  const dpr = window.devicePixelRatio || 1;
  // cell = device pixels per logical pixel
  cell = Math.max(1, Math.floor(Math.min(availW / lw, availH / lh) * dpr));
  if (D > 1) cell = Math.max(cell, D);  // detail needs room
  cv.width = lw * cell; cv.height = lh * cell;
  cv.style.width = (cv.width / dpr) + "px";
  cv.style.height = (cv.height / dpr) + "px";
  buildMask(lw, lh);
  draw();
 }
 /* black sheet with round holes, overlaid when "LED dots" is on */
 function buildMask(lw, lh) {
  mask = null;
  if (!$("led").checked || cell < 4) return;
  mask = document.createElement("canvas");
  mask.width = cv.width; mask.height = cv.height;
  const m = mask.getContext("2d");
  m.fillStyle = "#0b0b0d";
  m.fillRect(0, 0, mask.width, mask.height);
  m.globalCompositeOperation = "destination-out";
  const r = cell * 0.40;
  const tile = document.createElement("canvas");
  tile.width = tile.height = cell;
  const t = tile.getContext("2d");
  t.beginPath(); t.arc(cell / 2, cell / 2, r, 0, Math.PI * 2); t.fill();
  const pat = m.createPattern(tile, "repeat");
  m.fillStyle = pat;
  m.fillRect(0, 0, mask.width, mask.height);
 }
 function draw() {
  if (!img) return;
  ctx.save();
  ctx.imageSmoothingEnabled = false;
  ctx.fillStyle = "#000"; ctx.fillRect(0, 0, cv.width, cv.height);
  ctx.translate(cv.width / 2, cv.height / 2);
  ctx.rotate(rotation * Math.PI / 180);
  const dw = W * cell, dh = H * cell;
  ctx.drawImage(src, -dw / 2, -dh / 2, dw, dh);
  if ($("outline").checked && (W > 8 || H > 8)) {
    ctx.strokeStyle = "#fff"; ctx.lineWidth = Math.max(1, cell / 8);
    ctx.setLineDash([cell / 2, cell / 3]);
    ctx.strokeRect(-dw / 2, -dh / 2, Math.min(8, W) * cell, Math.min(8, H) * cell);
  }
  ctx.restore();
  if (mask) ctx.drawImage(mask, 0, 0);
  $("shift").textContent = shift;
 }
 function frame() {
  const t0 = performance.now();
  computeFrame();
  draw();
  $("ms").textContent = (performance.now() - t0).toFixed(1) + " ms";
  shift++;                       // paletteShift++ after drawing, as in the sketch
 }
 function tick(t) {
  const dt = Math.min(250, t - lastT); lastT = t;
  if (playing) {
    acc += dt;
    const period = 1000 / parseInt($("fps").value, 10);
    if (acc >= period) { acc %= period; frame(); }
  }
  requestAnimationFrame(tick);
 }
 /* ---------- UI ---------- */
 function applyPreset() {
  const v = $("preset").value;
  if (!v) return;
  const [w, h, d] = v.split(",");
  $("w").value = w; $("h").value = h; $("detail").value = d;
  $("led").checked = (d === "1");   // dots only make sense one sample per LED
  setup(); frame();
 }
 $("preset").onchange = applyPreset;
 for (const id of ["w", "h", "detail"]) $(id).onchange = () => { $("preset").value = ""; setup(); frame(); };
 $("cmode").onchange = () => { shift--; frame(); };
 $("rot").onchange = layout;
 $("led").onchange = layout;
 $("outline").onchange = draw;
 $("fps").oninput = () => $("fpsv").textContent = $("fps").value;
 $("play").onclick = () => { playing = !playing; $("play").textContent = playing ? "Pause" : "Play"; };
 $("step").onclick = () => { playing = false; $("play").textContent = "Play"; frame(); };
 $("reset").onclick = () => { shift = START_SHIFT; frame(); };
 $("fs").onclick = () => document.fullscreenElement ? document.exitFullscreen() : document.documentElement.requestFullscreen();
 window.addEventListener("resize", layout);
 document.addEventListener("fullscreenchange", () => setTimeout(layout, 50));
 document.addEventListener("keydown", e => {
  if (e.target.tagName === "INPUT" || e.target.tagName === "SELECT") return;
  if (e.code === "Space") { e.preventDefault(); $("play").click(); }
  else if (e.code === "ArrowRight") $("step").click();
  else if (e.key === "f" || e.key === "F") $("fs").click();
 });
 $("fpsv").textContent = $("fps").value;
 setup();
 frame();
 requestAnimationFrame(t => { lastT = t; tick(t); });
 </script>
 </body>
 </html>