用arduino编程GxEPD2库墨水屏随机显示取模图片

以下是一个简单的示例程序，使用Arduino编程和GxEPD2库来随机显示取模图片。

#include <GxEPD2_BW.h> // include the GxEPD2 library
#include <SPI.h> // include the SPI library

// initialize the display
GxEPD2_BW<GxEPD2_154_D67, GxEPD2_154_D67::HEIGHT / 8> display(GxEPD2_154_D67(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));

void setup() {
  // initialize the SPI bus
  SPI.begin();
  SPI.setBitOrder(MSBFIRST);
  SPI.setDataMode(SPI_MODE0);
  SPI.setClockDivider(SPI_CLOCK_DIV2);

  // initialize the display
  display.init(115200);
}

void loop() {
  // list of bitmap images
  static const unsigned char PROGMEM images[][32] = {
    {0x3C,0x42,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x42,0x3C},
    {0x00,0x7E,0x81,0x81,0x81,0x7E,0x00,0x00,0x00,0x7E,0x81,0x81,0x81,0x7E,0x00,0x00},
    {0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0xFF,0x00,0x00,0x00,0x00,0x00,0x00},
    {0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81},
    {0x00,0x00,0x00,0xFF,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81},
    {0x81,0xC3,0xC3,0xC3,0xA5,0xA5,0xFF,0xDB,0xDB,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3},
    {0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3,0xC3},
    {0xFF,0x00,0x00,0x00,0x00,0x00,0xFF,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x81}
  };

  // randomly choose an image
  int index = random(0, 8);

  // clear the display
  display.clear();

  // draw the image
  display.drawBitmap(0, 0, images[index], 16, 8, GxEPD_WHITE);

  // refresh the display
  display.display();

  // wait for a few seconds
  delay(5000);
}

该程序使用了GxEPD2_BW类，它是GxEPD2库中用于控制黑白墨水屏的类。在setup()函数中，我们初始化了SPI总线并初始化了显示屏。在loop()函数中，我们定义了一个包含8个不同图像的数组，然后使用random()函数随机选择一个图像。我们使用display.clear()清除屏幕，然后使用display.drawBitmap()函数绘制所选图像。最后，我们使用display.display()函数刷新屏幕并等待几秒钟，然后重复该过程。