当寻址超过7个LED条时，Adafruit NeoPixel库无法工作

Question

在最后一个问题上，我正在开发一个由Arduino Mega控制的交互式14x14LED表(有关设置和代码的更多信息，请看这里。修正了数据以错误的顺序到达Arduino的问题后，我现在面临着这个问题：

为了控制LED表上每个像素的颜色，使用Adafruit的NeoPixel库，我在表单int143的数组中读取。这现在工作很好，但当我试图设置RGB值超过7个LED条与相应的数据，什么都没有发生。我也有几个Serial.println()调用来检查读取什么数据，如果我运行超过7个LED条，0就会被打印出来，以确定每一个可能的值。

控制LED的基本功能是完美的-我也可以处理和输出上述数据正确的LED条，只要我不使用超过7条。问题是，如果我在一个数组中声明多于这7条条带，或者将它们分开，这并不重要。另外，单独初始化它们不像创建条带的一个实例那样有效，每次我想使用不同的条带时都会重新分配引脚。

我的代码现在看起来是这样的，我完全不知道造成这个问题的原因是什么，或者我如何解决这个问题。

#include <ArduinoJson.h>
#include <Adafruit_NeoPixel.h>

#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif

#define PINROW0 0
#define PINROW1 1
#define PINROW2 2
#define PINROW3 3
#define PINROW4 4
#define PINROW5 5
#define PINROW6 6
#define PINROW7 7
#define PINROW8 8
#define PINROW9 26
#define PINROW10 28
#define PINROW11 30
#define PINROW12 32
#define PINROW13 34

#define NUMPIXELS 14 //Anzahl der Pixel pro Reihe

/*Adafruit_NeoPixel row0 = Adafruit_NeoPixel(NUMPIXELS, PINROW0, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row1 = Adafruit_NeoPixel(NUMPIXELS, PINROW1, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row2 = Adafruit_NeoPixel(NUMPIXELS, PINROW2, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row3 = Adafruit_NeoPixel(NUMPIXELS, PINROW3, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row4 = Adafruit_NeoPixel(NUMPIXELS, PINROW4, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row5 = Adafruit_NeoPixel(NUMPIXELS, PINROW5, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row6 = Adafruit_NeoPixel(NUMPIXELS, PINROW6, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row7 = Adafruit_NeoPixel(NUMPIXELS, PINROW7, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row8 = Adafruit_NeoPixel(NUMPIXELS, PINROW8, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row9 = Adafruit_NeoPixel(NUMPIXELS, PINROW9, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row10 = Adafruit_NeoPixel(NUMPIXELS, PINROW10, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row11 = Adafruit_NeoPixel(NUMPIXELS, PINROW11, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row12 = Adafruit_NeoPixel(NUMPIXELS, PINROW12, NEO_GRB + NEO_KHZ800);
  Adafruit_NeoPixel row13 = Adafruit_NeoPixel(NUMPIXELS, PINROW13, NEO_GRB + NEO_KHZ800);
*/

//Adafruit_NeoPixel currentStrip = Adafruit_NeoPixel(NUMPIXELS, pins[0], NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel row[] = { //Initialisieren des Arrays, das die addressierbaren LED Streifen im Adafruit Format enthält
  Adafruit_NeoPixel(NUMPIXELS, PINROW0, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW1, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW2, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW3, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW4, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW5, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW6, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW7, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW8, NEO_GRB + NEO_KHZ800)/*,
  Adafruit_NeoPixel(NUMPIXELS, PINROW9, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW10, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW11, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW12, NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel(NUMPIXELS, PINROW13, NEO_GRB + NEO_KHZ800)*/
};


#define DELAY 1000 //Refresh Zyklus auf 10 Millisekunden setzen
#define NUMSTRIPS 9/*(sizeof(row)/sizeof(row[0]))*/ //Anzahl der verbundenen LED Streifen definieren


int values[14][14][3];
String matrixAsString = "";

void setup() {

#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
  clock_prescale_set(clock_div_1);
#endif

  /*Seriellen Port über den der Pi sich mit dem Arduino verbindet einrichten*/
  Serial.begin(115200); //setzen der Bitrate auf 115200 Bit pro Sekunde
  Serial.setTimeout(100000);

  /*NeoPixel Library initialisieren*/
  for (int i = 0; i < NUMSTRIPS; i++) {
    row[i].begin();
    row[i].show();
  }
}

void process(String matrixAsString) {
  DynamicJsonDocument doc(4372);
  Serial.println(matrixAsString);
  deserializeJson(doc, matrixAsString);

  Serial.println((int)(doc[2][10][0]));
  Serial.println((int)(doc[2][10][0]));
  Serial.println((int)(doc[5][10][0]));
  Serial.println((int)(doc[0][1][2]));
  Serial.println((int)(doc[0][0][1]));

  for (int i = 0; i < NUMSTRIPS; i++) {
    for (int j = 0; j < NUMPIXELS; j++) {
      for (int k = 0; k < 3; k++) {
        values[i][j][k] = (int)(doc[i][j][k]);
      }
    }
  }
}

void paint() {
  int r = 0;
  int g = 0;
  int b = 0;
  for (int i = 0; i < NUMSTRIPS; i++) {
    for (int j = 0; j < NUMPIXELS; j++) {
      r = values[i][j][0];
      g = values[i][j][1];
      b = values[i][j][2];
      row[i].setPixelColor(j, row[i].Color(r, g, b));
      row[i].show();
    }
  }
}

//infinite loop refreshing the matrix
void loop() {

  while (Serial.available()) {
    char c = Serial.read();
    matrixAsString += c;
    if (c == '\n') {
      process(matrixAsString);
      paint();
      matrixAsString = "";
    }

  }

}

作为正式的Adafruit文档，这个库被设计成有与Arduino所能支持的一样多的条连接，所以必须有一个解决方案。

为了测试我的代码，我使用了这个数据，它是随机生成的14x14RGB矩阵的字符串表示：

[[0,0,0,1,0,0,1,1,0,2,1,0,2,2,0,3,2,0,3,3,0,3,3,1,3,3,2,3,3,3,4,3,3,4,4,3,5,4,3,5,4,4]，[6,4,4,7,4,4,7,5,4,7,6,4,7,7,4,7,7,5,7,7,6,7,7,7,7,7,8,8,7,8,8,8,8,8,9,8,8,10,8,8,11,8]，[8,11,9,8,11,10,9,11,10,9,11,11,9,12,11,9,12,12,9,13,12,10,13,12,10,13,13,10,13,14,10,13,15,11,13,15,11,14,15,11,15,15]，[12,15,15,12,15,16,12,15,17,13,15,17,13,16,17,13,16,18,14,16,18,14,17,18,15,17,18,15,17,19,15,18,19,15,18,20,15,19,20,15,19,21]，[15,20,21,15,21,21,16,21,21,17,21,21,17,22,21,18,22,21,19,22,21,19,23,21,20,23,21,20,23,22,20,23,23,20,24,23,20,25,23,20,26,23]，[21,26,23,22,26,23,22,27,23,23,27,23,23,27,24,24,27,24,24,27,25,24,28,25,24,28,26,24,29,26,24,29,27,24,29,28,24,30,28,25,30,28]，[25,30,29,25,31,29,25,31,30,26,31,30,27,31,30,27,32,30,27,32,31,27,33,31,27,34,31,27,35,31,27,35,32,28,35,32,28,36,32,29,36,32]，[29,37,32,29,37,33,29,38,33,29,38,34,30,38,34,31,38,34,32,38,34,33,38,34,33,39,34,33,39,35,33,39,36,33,40,36,33,40,37,33,41,37]，[33,42,37,33,42,38,33,42,39,33,42,40,33,43,40,33,43,41,33,43,42,33,44,42,33,45,42,33,45,43,33,46,43,34,46,43,34,47,43,35,47,43]，[36,47,43,37,47,43,38,47,43,38,47,44,39,47,44,39,47,45,39,48,45,40,48,45,40,48,46,40,49,46,41,49,46,41,50,46,41,51,46,41,51,47]，[42,51,47,42,51,48,43,51,48,43,51,49,43,52,49,43,53,49,43,54,49,43,54,50,44,54,50,44,55,50,45,55,50,45,55,51,46,55,51,47,55,51]，[48,55,51,48,56,51,48,57,51,48,58,51,48,58,52,48,58,53,48,59,53,48,59,54,48,60,54,48,60,55,48,60,56,48,60,57,49,60,57,49,61,57]，[49,62,57,49,62,58,49,63,58,49,63,59,50,63,59,50,64,59,50,65,59,51,65,59,52,65,59,53,65,59,54,65,59,54,66,59,54,66,60,54,67,60]，[55,67,60,56,67,60,57,67,60,58,67,60,59,67,60,59,67,61,59,68,61,59,69,61,60,69,61,61,69,61,61,69,62,61,69,63,61,70,63,61,71,63]]

谢谢您的帮助，我非常感谢您提供的任何建议或建议。

Answer 1

您只有8kB的ram，您正在使用：

• 这个数组上的int values[14][14][3]; => 1176字节(如果要使用字节/uint8 8_t而不是int，而不是一半)
• 该死的String matrixAsString = "";和+=操作符。这会严重扰乱内存(就内存碎片而言)。
• DynamicJsonDocument doc(4372);分配另一个巨大的内存
• 更别提了，每个条子都有自己的像素内存，所以values阵列有点多余
• 也许可以使用相同的缓冲区来读取和json解析器？可能会省下很多钱

因此，根据这一点，你必须失去记忆

无论如何，我会使用一些像样的ARM和DMA魔法(例如，在STM32 MCU上同时使用16个通道)，而不用太多的CPU交互来发送它。或者像OctoWS2811发光二极管库这样的现有解决方案