Noob... UNO maxed out but Mega wont run Matrix?

hjg_leeds · November 21, 2021, 11:08pm

Hi.. I have nearly finished a Wearable LED Matrix coat... have all the codes running and animations but its maxed the UNO.. Checked forum and it suggested a Mega.... This uploads the script with no problem... but the LEDs wont run.

I have re run the irregular matrix to a size the UNO runs and checked its all working... it does.

I then change to the Mega and upload the same scripts that the UNO is running and duplicate all the pin positions but it refuses to run at all??

I can load a LED string pattern for all 896 LEDS and the Mega runs these no problem but the UNO cannot.

Any ideas out there where i'm going wrong??... apart from starting the coat that is

mickhowe · November 21, 2021, 11:14pm

I'm probably wrong but UNO and MEGA use different pin mapping. You might want to look into that while you wait for some one more knowledgeable to pipe up

mick in glen innes

mrburnette · November 21, 2021, 11:14pm

not all code is 100% compatible:

https://thecustomizewindows.com/2018/05/difference-between-arduino-uno-and-arduino-mega/

hjg_leeds · November 21, 2021, 11:19pm

Oh that scared me.. its taken long enough to work the scripts I have as it is lol..

but in the article it says
"Not all codes for Arduino Mega actually will work on Arduino UNO. But all codes for Arduino UNO will work on Arduino Mega."

mrburnette · November 21, 2021, 11:22pm

I was more concern with your wiring from uno moved to Mega...
I have made mistakes previously moving jumpers.

aarg · November 21, 2021, 11:25pm

Before you reply again, be aware that new users have a post limit on the first day. So if we continue in question and answer format, you will be locked out eventually. Best to think a bit and post as much information as you can, all at once.

We need:

the code in code tags
a schematic

hjg_leeds · November 21, 2021, 11:28pm

I have specified the Pins in the script closely following the Scott Marley
code:
(Arduino powered LED Mask with FastLED [Part 1] - How to write code for an irregular matrix - YouTube)

#define LED_PIN 6
#define MODE_PIN 3

The code works on the UNO perfectly as does the button mode change. The Mega works the full LED matrix as a "long string" with no problem.. I must be missing something basic... like sleep ATM .. I try specifying other Pins tomorrow though

aarg · November 21, 2021, 11:29pm

Not good enough. We need the actual code you've written. Sorry. Also where is the schematic?

hjg_leeds · November 22, 2021, 12:29am

Sorry mechanical not electrical engineer but this is the schematic,

also shown the UNO with the code running.

// https://macetech.github.io/FastLED-XY-Map-Generator/  irregular Matrix code
// Irregular Matrix code by Garrett Mace (macetech.com), inspired by Mark Kriegsman
// original code Scott Marley  https://github.com/s-marley/LEDMask
// Scott Video https://www.youtube.com/watch?v=zYZkbfmCuEY
// Removed Microphone / sound programming with // but left code in v1
     

#include <FastLED.h>
#include <EEPROM.h>
#include <JC_Button.h>

#define LED_PIN           6           // Output pin for LEDs [5]
#define MODE_PIN          3           // Input pin for button to change mode [3]
#define PLUS_PIN          2           // Input pin for plus button [2]
#define MINUS_PIN         4           // Input pin for minus button [4]
//#define MIC_PIN           A6          // Input pin for microphone [A6]
#define COLOR_ORDER       GRB         // Color order of LED string [GRB]
#define CHIPSET           WS2812B     // LED string type [WS2182B]
#define BRIGHTNESS        50          // Overall brightness [50]
#define LAST_VISIBLE_LED  895         // Last LED that's visible [895]
#define MAX_MILLIAMPS     2000        // Max current in mA to draw from supply [Changed to 2000 in v1]
#define SAMPLE_WINDOW     100         // How many ms to sample audio for [100]
#define DEBOUNCE_MS       20          // Number of ms to debounce the button [20]
#define LONG_PRESS        500         // Number of ms to hold the button to count as long press [500]
#define PATTERN_TIME      10          // Seconds to show each pattern on autoChange [10]
#define kMatrixWidth      43          // Matrix width [43 columns]
#define kMatrixHeight     24          // Matrix height [24 pixel max height]
#define NUM_LEDS (kMatrixWidth * kMatrixHeight)                                       // Total number of Leds
#define MAX_DIMENSION ((kMatrixWidth>kMatrixHeight) ? kMatrixWidth : kMatrixHeight)   // Largest dimension of matrix 43 wide in v1

CRGB leds[ NUM_LEDS ];
uint8_t brightness = BRIGHTNESS;
uint8_t soundSensitivity = 10;

// Used to check RAM availability. Usage: Serial.println(freeRam());
//int freeRam () {
 // extern int __heap_start, *__brkval;
 // int v;
 // return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
//}

// Button stuff
uint8_t buttonPushCounter = 9; // Was 10 but removed 1 for sound.h not in v1
uint8_t state = 0;
bool autoChangeVisuals = true; // this should mean only button press changes pattern
Button modeBtn(MODE_PIN, DEBOUNCE_MS);
Button plusBtn(PLUS_PIN, DEBOUNCE_MS);
Button minusBtn(MINUS_PIN, DEBOUNCE_MS);

void incrementButtonPushCounter() {
  buttonPushCounter = (buttonPushCounter + 1) %11;
  EEPROM.write(1, buttonPushCounter);
}

// Include various patterns
#include "Rainbow.h"
#include "Fire.h"
#include "Squares.h"
#include "Circles.h"
#include "Plasma.h"
#include "Matrix.h"
#include "CrossHatch.h"
#include "Drops.h"
#include "Noise.h"
#include "Snake.h"

// Helper to map XY coordinates to irregular matrix
uint16_t XY( uint8_t x, uint8_t y)
{
  // any out of bounds address maps to the first hidden pixel
  // Vertical serpentine matrix 43 columns max height 24 used for coat
  if( (x >= kMatrixWidth) || (y >= kMatrixHeight) ) {
    return (LAST_VISIBLE_LED + 1);
  }

  const uint16_t XYTable[] = {
   896, 897, 898, 899, 900, 138, 139, 906, 907, 921, 214, 247, 248, 950, 951, 963, 316, 363, 364, 411, 412, 459, 460, 507, 508, 555, 556, 969, 970, 984, 631, 664, 665,1013,1014,1026, 733, 780,1027,1028,1029,1030,1031,
     0,  45,  46,  91,  92, 137, 140, 905, 908, 213, 215, 246, 249, 280, 952, 962, 317, 362, 365, 410, 413, 458, 461, 506, 509, 554, 557, 968, 971, 630, 632, 663, 666, 697,1015,1025, 734, 779, 781, 826, 827, 872, 873,
     1,  44,  47,  90,  93, 136, 141, 904, 909, 212, 216, 245, 250, 279, 953, 961, 318, 361, 366, 409, 414, 457, 462, 505, 510, 553, 558, 967, 972, 629, 633, 662, 667, 696,1016,1024, 735, 778, 782, 825, 828, 871, 874,
     2,  43,  48,  89,  94, 135, 142, 903, 910, 211, 217, 244, 251, 278, 954, 960, 319, 360, 367, 408, 415, 456, 463, 504, 511, 552, 559, 966, 973, 628, 634, 661, 668, 695,1017,1023, 736, 777, 783, 824, 829, 870, 875,
     3,  42,  49,  88,  95, 134, 143, 902, 911, 210, 218, 243, 252, 277, 955, 959, 320, 359, 368, 407, 416, 455, 464, 503, 512, 551, 560, 965, 974, 627, 635, 660, 669, 694,1018,1022, 737, 776, 784, 823, 830, 869, 876,
     4,  41,  50,  87,  96, 133, 144, 901, 912, 209, 219, 242, 253, 276, 956, 958, 321, 358, 369, 406, 417, 454, 465, 502, 513, 550, 561, 964, 975, 626, 636, 659, 670, 693,1019,1021, 738, 775, 785, 822, 831, 868, 877,
     5,  40,  51,  86,  97, 132, 145, 180, 913, 208, 220, 241, 254, 275, 957, 315, 322, 357, 370, 405, 418, 453, 466, 501, 514, 549, 562, 597, 976, 625, 637, 658, 671, 692,1020, 732, 739, 774, 786, 821, 832, 867, 878,
     6,  39,  52,  85,  98, 131, 146, 179, 181, 207, 221, 240, 255, 274, 281, 314, 323, 356, 371, 404, 419, 452, 467, 500, 515, 548, 563, 596, 598, 624, 638, 657, 672, 691, 698, 731, 740, 773, 787, 820, 833, 866, 879,
     7,  38,  53,  84,  99, 130, 147, 178, 182, 206, 222, 239, 256, 273, 282, 313, 324, 355, 372, 403, 420, 451, 468, 499, 516, 547, 564, 595, 599, 623, 639, 656, 673, 690, 699, 730, 741, 772, 788, 819, 834, 865, 880,
     8,  37,  54,  83, 100, 129, 148, 177, 183, 205, 223, 238, 257, 272, 283, 312, 325, 354, 373, 402, 421, 450, 469, 498, 517, 546, 565, 594, 600, 622, 640, 655, 674, 689, 700, 729, 742, 771, 789, 818, 835, 864, 881,
     9,  36,  55,  82, 101, 128, 149, 176, 184, 204, 224, 237, 258, 271, 284, 311, 326, 353, 374, 401, 422, 449, 470, 497, 518, 545, 566, 593, 601, 621, 641, 654, 675, 688, 701, 728, 743, 770, 790, 817, 836, 863, 882,
    10,  35,  56,  81, 102, 127, 150, 175, 185, 203, 225, 236, 259, 270, 285, 310, 327, 352, 375, 400, 423, 448, 471, 496, 519, 544, 567, 592, 602, 620, 642, 653, 676, 687, 702, 727, 744, 769, 791, 816, 837, 862, 883,
    11,  34,  57,  80, 103, 126, 151, 174, 186, 202, 226, 235, 260, 269, 286, 309, 328, 351, 376, 399, 424, 447, 472, 495, 520, 543, 568, 591, 603, 619, 643, 652, 677, 686, 703, 726, 745, 768, 792, 815, 838, 861, 884,
    12,  33,  58,  79, 104, 125, 152, 173, 187, 201, 227, 234, 261, 268, 287, 308, 329, 350, 377, 398, 425, 446, 473, 494, 521, 542, 569, 590, 604, 618, 644, 651, 678, 685, 704, 725, 746, 767, 793, 814, 839, 860, 885,
    13,  32,  59,  78, 105, 124, 153, 172, 188, 200, 228, 233, 262, 267, 288, 307, 330, 349, 378, 397, 426, 445, 474, 493, 522, 541, 570, 589, 605, 617, 645, 650, 679, 684, 705, 724, 747, 766, 794, 813, 840, 859, 886,
    14,  31,  60,  77, 106, 123, 154, 171, 189, 199, 229, 232, 263, 266, 289, 306, 331, 348, 379, 396, 427, 444, 475, 492, 523, 540, 571, 588, 606, 616, 646, 649, 680, 683, 706, 723, 748, 765, 795, 812, 841, 858, 887,
    15,  30,  61,  76, 107, 122, 155, 170, 190, 198, 230, 231, 264, 265, 290, 305, 332, 347, 380, 395, 428, 443, 476, 491, 524, 539, 572, 587, 607, 615, 647, 648, 681, 682, 707, 722, 749, 764, 796, 811, 842, 857, 888,
    16,  29,  62,  75, 108, 121, 156, 169, 191, 920, 922, 935, 936, 949, 291, 304, 333, 346, 381, 394, 429, 442, 477, 490, 525, 538, 573, 586, 608, 983, 985, 998, 999,1012, 708, 721, 750, 763, 797, 810, 843, 856, 889,
    17,  28,  63,  74, 109, 120, 157, 168, 192, 919, 923, 934, 937, 948, 292, 303, 334, 345, 382, 393, 430, 441, 478, 489, 526, 537, 574, 585, 609, 982, 986, 997,1000,1011, 709, 720, 751, 762, 798, 809, 844, 855, 890,
    18,  27,  64,  73, 110, 119, 158, 167, 193, 918, 924, 933, 938, 947, 293, 302, 335, 344, 383, 392, 431, 440, 479, 488, 527, 536, 575, 584, 610, 981, 987, 996,1001,1010, 710, 719, 752, 761, 799, 808, 845, 854, 891,
    19,  26,  65,  72, 111, 118, 159, 166, 194, 917, 925, 932, 939, 946, 294, 301, 336, 343, 384, 391, 432, 439, 480, 487, 528, 535, 576, 583, 611, 980, 988, 995,1002,1009, 711, 718, 753, 760, 800, 807, 846, 853, 892,
    20,  25,  66,  71, 112, 117, 160, 165, 195, 916, 926, 931, 940, 945, 295, 300, 337, 342, 385, 390, 433, 438, 481, 486, 529, 534, 577, 582, 612, 979, 989, 994,1003,1008, 712, 717, 754, 759, 801, 806, 847, 852, 893,
    21,  24,  67,  70, 113, 116, 161, 164, 196, 915, 927, 930, 941, 944, 296, 299, 338, 341, 386, 389, 434, 437, 482, 485, 530, 533, 578, 581, 613, 978, 990, 993,1004,1007, 713, 716, 755, 758, 802, 805, 848, 851, 894,
    22,  23,  68,  69, 114, 115, 162, 163, 197, 914, 928, 929, 942, 943, 297, 298, 339, 340, 387, 388, 435, 436, 483, 484, 531, 532, 579, 580, 614, 977, 991, 992,1005,1006, 714, 715, 756, 757, 803, 804, 849, 850, 895
  };

  uint8_t i = (y * kMatrixWidth) + x;
  uint8_t j = XYTable[i];
  return j;
}

void setup() {
  FastLED.addLeds < CHIPSET, LED_PIN, COLOR_ORDER > (leds, NUM_LEDS).setCorrection(TypicalSMD5050);
  FastLED.setBrightness(brightness);
  FastLED.clear(true);

  //Upload this sketch once, then uncomment the line below and upload again.
  // This ensures the EEPROM value is set correctly.
  // buttonPushCounter = (int)EEPROM.read(1);    // load previous setting

  modeBtn.begin();
  plusBtn.begin();
  minusBtn.begin();
  buttonPushCounter = (int)EEPROM.read(1);    // load previous setting
  
  Serial.begin(57600);
  Serial.print(F("Starting pattern "));
  Serial.println(buttonPushCounter);
}

void checkBrightnessButton() {
  // On all none-sound reactive patterns, plus and minus control the brightness
  plusBtn.read();
  minusBtn.read();

  if (plusBtn.wasReleased()) {
    brightness += 10; // changed to + 10 incriments from 20
    FastLED.setBrightness(brightness);
  }

  if (minusBtn.wasReleased()) {
    brightness -= 10; // changed to - 10 incriments from -20
    FastLED.setBrightness(brightness);
  }
}

void checkSoundLevelButton(){
  // On all sound reactive patterns, plus and minus control the sound sensitivity
  plusBtn.read();
  minusBtn.read();

  if (plusBtn.wasReleased()) {
    // Increase sound sensitivity
    soundSensitivity -= 1;
    if (soundSensitivity == 0) soundSensitivity = 1;
  }

  if (minusBtn.wasReleased()) {
    // Decrease sound sensitivity
    soundSensitivity += 1;
  }
}

bool checkModeButton() {  
  modeBtn.read();

  switch (state) {
    case 0:                
      if (modeBtn.wasReleased()) {
        incrementButtonPushCounter();
        Serial.print(F("Short press, pattern "));
        Serial.println(buttonPushCounter);
        autoChangeVisuals = false;
        return true;
      }
      else if (modeBtn.pressedFor(LONG_PRESS)) {
        state = 1;
        return true;
      }
      break;

    case 1:
      if (modeBtn.wasReleased()) {
        state = 0;
        Serial.print(F("Long press, auto, pattern "));
        Serial.println(buttonPushCounter);
        autoChangeVisuals = true;
        return true;
      }
      break;
  }

  if(autoChangeVisuals){
    EVERY_N_SECONDS(PATTERN_TIME) {
      incrementButtonPushCounter();
      Serial.print("Auto, pattern ");
      Serial.println(buttonPushCounter); 
      return true;
    }
  }  

  return false;
}

// Functions to run patterns. Done this way so each class stays in scope only while
// it is active, freeing up RAM once it is changed.

//void runSound(){ // edited out sound in v1
 // bool isRunning = true;
 // Sound sound = Sound();
 // while(isRunning) isRunning = sound.runPattern();
//}

void runRainbow(){
  bool isRunning = true;
  Rainbow rainbow = Rainbow();
  while(isRunning) isRunning = rainbow.runPattern();
}

void runFire(){
  bool isRunning = true;
  Fire fire = Fire();
  while(isRunning) isRunning = fire.runPattern();
}

void runSquares(){
  bool isRunning = true;
  Squares squares = Squares();
  while(isRunning) isRunning = squares.runPattern();
}

void runCircles(){
  bool isRunning = true;
  Circles circles = Circles();
  while(isRunning) isRunning = circles.runPattern();
}

void runPlasma(){
  bool isRunning = true;
  Plasma plasma = Plasma();
  while(isRunning) isRunning = plasma.runPattern();
}

void runMatrix(){
  bool isRunning = true;
  Matrix matrix = Matrix();
  while(isRunning) isRunning = matrix.runPattern();
}

void runCrossHatch(){
  bool isRunning = true;
  CrossHatch crossHatch = CrossHatch();
  while(isRunning) isRunning = crossHatch.runPattern();
}

void runDrops(){
  bool isRunning = true;
  Drops drops = Drops();
  while(isRunning) isRunning = drops.runPattern();
}

void runNoise(){
  bool isRunning = true;
  Noise noise = Noise();
  while(isRunning) {
    isRunning = noise.runPattern();
  }
}

void runSnake(){
  bool isRunning = true;
  Snake snake = Snake();
  while(isRunning) {
    isRunning = snake.runPattern();
  }
}

// Run selected pattern
void loop() {
  switch (buttonPushCounter) {
    case 0:
      runSnake();
      break;
    case 1:
      runRainbow();
      break;
    case 2:
      runFire();
      break;
    case 3:
      runSquares();
      break;
    case 4:
      runCircles();
      break;
    case 5:
      runPlasma();
      break;
    case 6:
      runMatrix();
      break;
    case 7:
      runCrossHatch();
      break;
    case 8:
      runDrops();
      break;
    case 9:
      runNoise();
      break;
  }
}

hjg_leeds · November 22, 2021, 12:31am

Tired, sorry, the button pin is in 3 not 4 as I drew.

hjg_leeds · November 22, 2021, 12:48am

The Mega running all 896 LEDS on the "TwinkleFox" example code in FastLED... It must be the Matrix coding?? MEGA

johnwasser · November 22, 2021, 10:48pm

You have 1032 LED's (24x43) at four bytes each so that's over 4000 bytes. Your XYTable is another 2000 or so? You might be reaching the limit of what the Mega can hold.

I recommend you put XYTable in FLASH memory:
const uint16_t XYTable[] PROGMEM = {

You will have to fetch the values from PROGMEM:

  uint8_t i = (y * kMatrixWidth) + x;
  uint8_t j = pgm_read_word(&XYTable[i]);
  return j;

WARNING: Your table contains values over 255 but you are returning only the bottom 8 bits (uint8_t). You should probably make 'j' uint16_t.

hjg_leeds · November 22, 2021, 10:48pm

The Mega works with FastLED XY Matrix on full array however due to the irregular matrix it does not display properly... It must be the Irregular matrix code but I have re-done it several times and I think its correct...... any guidance appreciated.

hjg_leeds · November 22, 2021, 10:50pm

Thankyou John... appreciated.. I will try tomorrow with your suggestions.

hjg_leeds · November 30, 2021, 10:30pm

Hi John,

I have finally got the code working on the coat.. which is a plus. the only down side it animates a little too slowly.

I have run the script on "half a coat" and it runs perfectly using 36% of dynamic memory ( 68% when full coat)

I have converted to uint16_t as you suggested and this works.

I have set PROGMEM up as below but the sequencing dies and seem to get random pixels firing though dynamic memory use fell to 48 % so on the right tracks.

I have also tried the other PROGMEM functions but not winning... any suggestions??

const PROGMEM uint16_t XYTable[] = {
   896, 897, 898, 899, 900, 138, 139, 906, 907, 921, 214, 247, 248, 950, 951, 963, 316, 363, 364, 411, 412, 459, 460, 507, 508, 555, 556, 969, 970, 984, 631, 664, 665,1013,1014,1026, 733, 780,1027,1028,1029,1030,1031,
     0,  45,  46,  91,  92, 137, 140, 905, 908, 213, 215, 246, 249, 280, 952, 962, 317, 362, 365, 410, 413, 458, 461, 506, 509, 554, 557, 968, 971, 630, 632, 663, 666, 697,1015,1025, 734, 779, 781, 826, 827, 872, 873,
     1,  44,  47,  90,  93, 136, 141, 904, 909, 212, 216, 245, 250, 279, 953, 961, 318, 361, 366, 409, 414, 457, 462, 505, 510, 553, 558, 967, 972, 629, 633, 662, 667, 696,1016,1024, 735, 778, 782, 825, 828, 871, 874,
     2,  43,  48,  89,  94, 135, 142, 903, 910, 211, 217, 244, 251, 278, 954, 960, 319, 360, 367, 408, 415, 456, 463, 504, 511, 552, 559, 966, 973, 628, 634, 661, 668, 695,1017,1023, 736, 777, 783, 824, 829, 870, 875,
     3,  42,  49,  88,  95, 134, 143, 902, 911, 210, 218, 243, 252, 277, 955, 959, 320, 359, 368, 407, 416, 455, 464, 503, 512, 551, 560, 965, 974, 627, 635, 660, 669, 694,1018,1022, 737, 776, 784, 823, 830, 869, 876,
     4,  41,  50,  87,  96, 133, 144, 901, 912, 209, 219, 242, 253, 276, 956, 958, 321, 358, 369, 406, 417, 454, 465, 502, 513, 550, 561, 964, 975, 626, 636, 659, 670, 693,1019,1021, 738, 775, 785, 822, 831, 868, 877,
     5,  40,  51,  86,  97, 132, 145, 180, 913, 208, 220, 241, 254, 275, 957, 315, 322, 357, 370, 405, 418, 453, 466, 501, 514, 549, 562, 597, 976, 625, 637, 658, 671, 692,1020, 732, 739, 774, 786, 821, 832, 867, 878,
     6,  39,  52,  85,  98, 131, 146, 179, 181, 207, 221, 240, 255, 274, 281, 314, 323, 356, 371, 404, 419, 452, 467, 500, 515, 548, 563, 596, 598, 624, 638, 657, 672, 691, 698, 731, 740, 773, 787, 820, 833, 866, 879,
     7,  38,  53,  84,  99, 130, 147, 178, 182, 206, 222, 239, 256, 273, 282, 313, 324, 355, 372, 403, 420, 451, 468, 499, 516, 547, 564, 595, 599, 623, 639, 656, 673, 690, 699, 730, 741, 772, 788, 819, 834, 865, 880,
     8,  37,  54,  83, 100, 129, 148, 177, 183, 205, 223, 238, 257, 272, 283, 312, 325, 354, 373, 402, 421, 450, 469, 498, 517, 546, 565, 594, 600, 622, 640, 655, 674, 689, 700, 729, 742, 771, 789, 818, 835, 864, 881,
     9,  36,  55,  82, 101, 128, 149, 176, 184, 204, 224, 237, 258, 271, 284, 311, 326, 353, 374, 401, 422, 449, 470, 497, 518, 545, 566, 593, 601, 621, 641, 654, 675, 688, 701, 728, 743, 770, 790, 817, 836, 863, 882,
    10,  35,  56,  81, 102, 127, 150, 175, 185, 203, 225, 236, 259, 270, 285, 310, 327, 352, 375, 400, 423, 448, 471, 496, 519, 544, 567, 592, 602, 620, 642, 653, 676, 687, 702, 727, 744, 769, 791, 816, 837, 862, 883,
    11,  34,  57,  80, 103, 126, 151, 174, 186, 202, 226, 235, 260, 269, 286, 309, 328, 351, 376, 399, 424, 447, 472, 495, 520, 543, 568, 591, 603, 619, 643, 652, 677, 686, 703, 726, 745, 768, 792, 815, 838, 861, 884,
    12,  33,  58,  79, 104, 125, 152, 173, 187, 201, 227, 234, 261, 268, 287, 308, 329, 350, 377, 398, 425, 446, 473, 494, 521, 542, 569, 590, 604, 618, 644, 651, 678, 685, 704, 725, 746, 767, 793, 814, 839, 860, 885,
    13,  32,  59,  78, 105, 124, 153, 172, 188, 200, 228, 233, 262, 267, 288, 307, 330, 349, 378, 397, 426, 445, 474, 493, 522, 541, 570, 589, 605, 617, 645, 650, 679, 684, 705, 724, 747, 766, 794, 813, 840, 859, 886,
    14,  31,  60,  77, 106, 123, 154, 171, 189, 199, 229, 232, 263, 266, 289, 306, 331, 348, 379, 396, 427, 444, 475, 492, 523, 540, 571, 588, 606, 616, 646, 649, 680, 683, 706, 723, 748, 765, 795, 812, 841, 858, 887,
    15,  30,  61,  76, 107, 122, 155, 170, 190, 198, 230, 231, 264, 265, 290, 305, 332, 347, 380, 395, 428, 443, 476, 491, 524, 539, 572, 587, 607, 615, 647, 648, 681, 682, 707, 722, 749, 764, 796, 811, 842, 857, 888,
    16,  29,  62,  75, 108, 121, 156, 169, 191, 920, 922, 935, 936, 949, 291, 304, 333, 346, 381, 394, 429, 442, 477, 490, 525, 538, 573, 586, 608, 983, 985, 998, 999,1012, 708, 721, 750, 763, 797, 810, 843, 856, 889,
    17,  28,  63,  74, 109, 120, 157, 168, 192, 919, 923, 934, 937, 948, 292, 303, 334, 345, 382, 393, 430, 441, 478, 489, 526, 537, 574, 585, 609, 982, 986, 997,1000,1011, 709, 720, 751, 762, 798, 809, 844, 855, 890,
    18,  27,  64,  73, 110, 119, 158, 167, 193, 918, 924, 933, 938, 947, 293, 302, 335, 344, 383, 392, 431, 440, 479, 488, 527, 536, 575, 584, 610, 981, 987, 996,1001,1010, 710, 719, 752, 761, 799, 808, 845, 854, 891,
    19,  26,  65,  72, 111, 118, 159, 166, 194, 917, 925, 932, 939, 946, 294, 301, 336, 343, 384, 391, 432, 439, 480, 487, 528, 535, 576, 583, 611, 980, 988, 995,1002,1009, 711, 718, 753, 760, 800, 807, 846, 853, 892,
    20,  25,  66,  71, 112, 117, 160, 165, 195, 916, 926, 931, 940, 945, 295, 300, 337, 342, 385, 390, 433, 438, 481, 486, 529, 534, 577, 582, 612, 979, 989, 994,1003,1008, 712, 717, 754, 759, 801, 806, 847, 852, 893,
    21,  24,  67,  70, 113, 116, 161, 164, 196, 915, 927, 930, 941, 944, 296, 299, 338, 341, 386, 389, 434, 437, 482, 485, 530, 533, 578, 581, 613, 978, 990, 993,1004,1007, 713, 716, 755, 758, 802, 805, 848, 851, 894,
    22,  23,  68,  69, 114, 115, 162, 163, 197, 914, 928, 929, 942, 943, 297, 298, 339, 340, 387, 388, 435, 436, 483, 484, 531, 532, 579, 580, 614, 977, 991, 992,1005,1006, 714, 715, 756, 757, 803, 804, 849, 850, 895
  };

  uint16_t i = (y * kMatrixWidth) + x;
  uint16_t j = pgm_read_word(&XYTable[i]);
  return j;

johnwasser · December 1, 2021, 3:32pm

On a MEGA it is possible that the table is outside the first 64k of FLASH/PROGMEM. If that is the case you have to use 'far' (32-bit) addresses:
uint16_t j = pgm_read_word_far(&XYTable[i]);
Try that and see if it fixes your pattern.

hjg_leeds · December 1, 2021, 4:35pm

On it tonight John…. I think I tried the _far but will try again.

system · May 30, 2022, 4:36pm

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