Arduino OLED 屏幕卡住,显示奇怪的白屏 [已关闭]

问题描述 投票:0回答:1

我正在尝试让 4 个 OLED 屏幕正常工作。我已正确连接它们(我认为),并从库示例中获取了代码。但是,我仍然遇到奇怪的白屏。

我已经像这样连接屏幕了:

VDD -> +5V
GND -> GND
SCK -> 21
SDA -> 20

我使用的是arduino Mega2560。我使用的代码如下所示:

    #include <SPI.h>
    #include <Wire.h>
    #include <Adafruit_GFX.h>
    #include <Adafruit_SSD1306.h>
    
    #define SCREEN_WIDTH 128 // OLED display width, in pixels
    #define SCREEN_HEIGHT 64 // OLED display height, in pixels
    
    // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
    #define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
    Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
    
    #define NUMFLAKES     10 // Number of snowflakes in the animation example
    
    #define LOGO_HEIGHT   16
    #define LOGO_WIDTH    16
    static const unsigned char PROGMEM logo_bmp[] =
    { B00000000, B11000000,
      B00000001, B11000000,
      B00000001, B11000000,
      B00000011, B11100000,
      B11110011, B11100000,
      B11111110, B11111000,
      B01111110, B11111111,
      B00110011, B10011111,
      B00011111, B11111100,
      B00001101, B01110000,
      B00011011, B10100000,
      B00111111, B11100000,
      B00111111, B11110000,
      B01111100, B11110000,
      B01110000, B01110000,
      B00000000, B00110000 };
    
    void setup() {
      Serial.begin(115200);
    
      // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
      if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
        Serial.println(F("SSD1306 allocation failed"));
        for(;;); // Don't proceed, loop forever
      }
    
      // Show initial display buffer contents on the screen --
      // the library initializes this with an Adafruit splash screen.
      display.display();
      delay(2000); // Pause for 2 seconds
    
      // Clear the buffer
      display.clearDisplay();
    
      // Draw a single pixel in white
      display.drawPixel(10, 10, WHITE);
    
      // Show the display buffer on the screen. You MUST call display() after
      // drawing commands to make them visible on screen!
      display.display();
      delay(2000);
      // display.display() is NOT necessary after every single drawing command,
      // unless that's what you want...rather, you can batch up a bunch of
      // drawing operations and then update the screen all at once by calling
      // display.display(). These examples demonstrate both approaches...
    
      testdrawline();      // Draw many lines
    
      testdrawrect();      // Draw rectangles (outlines)
    
      testfillrect();      // Draw rectangles (filled)
    
      testdrawcircle();    // Draw circles (outlines)
    
      testfillcircle();    // Draw circles (filled)
    
      testdrawroundrect(); // Draw rounded rectangles (outlines)
    
      testfillroundrect(); // Draw rounded rectangles (filled)
    
      testdrawtriangle();  // Draw triangles (outlines)
    
      testfilltriangle();  // Draw triangles (filled)
    
      testdrawchar();      // Draw characters of the default font
    
      testdrawstyles();    // Draw 'stylized' characters
    
      testscrolltext();    // Draw scrolling text
    
      testdrawbitmap();    // Draw a small bitmap image
    
      // Invert and restore display, pausing in-between
      display.invertDisplay(true);
      delay(1000);
      display.invertDisplay(false);
      delay(1000);
    
      testanimate(logo_bmp, LOGO_WIDTH, LOGO_HEIGHT); // Animate bitmaps
    }
    
    void loop() {
    }
    
    void testdrawline() {
      int16_t i;
    
      display.clearDisplay(); // Clear display buffer
    
      for(i=0; i<display.width(); i+=4) {
        display.drawLine(0, 0, i, display.height()-1, WHITE);
        display.display(); // Update screen with each newly-drawn line
        delay(1);
      }
      for(i=0; i<display.height(); i+=4) {
        display.drawLine(0, 0, display.width()-1, i, WHITE);
        display.display();
        delay(1);
      }
      delay(250);
    
      display.clearDisplay();
    
      for(i=0; i<display.width(); i+=4) {
        display.drawLine(0, display.height()-1, i, 0, WHITE);
        display.display();
        delay(1);
      }
      for(i=display.height()-1; i>=0; i-=4) {
        display.drawLine(0, display.height()-1, display.width()-1, i, WHITE);
        display.display();
        delay(1);
      }
      delay(250);
    
      display.clearDisplay();
    
      for(i=display.width()-1; i>=0; i-=4) {
        display.drawLine(display.width()-1, display.height()-1, i, 0, WHITE);
        display.display();
        delay(1);
      }
      for(i=display.height()-1; i>=0; i-=4) {
        display.drawLine(display.width()-1, display.height()-1, 0, i, WHITE);
        display.display();
        delay(1);
      }
      delay(250);
    
      display.clearDisplay();
    
      for(i=0; i<display.height(); i+=4) {
        display.drawLine(display.width()-1, 0, 0, i, WHITE);
        display.display();
        delay(1);
      }
      for(i=0; i<display.width(); i+=4) {
        display.drawLine(display.width()-1, 0, i, display.height()-1, WHITE);
        display.display();
        delay(1);
      }
    
      delay(2000); // Pause for 2 seconds
    }
    
    void testdrawrect(void) {
      display.clearDisplay();
    
      for(int16_t i=0; i<display.height()/2; i+=2) {
        display.drawRect(i, i, display.width()-2*i, display.height()-2*i, WHITE);
        display.display(); // Update screen with each newly-drawn rectangle
        delay(1);
      }
    
      delay(2000);
    }
    
    void testfillrect(void) {
      display.clearDisplay();
    
      for(int16_t i=0; i<display.height()/2; i+=3) {
        // The INVERSE color is used so rectangles alternate white/black
        display.fillRect(i, i, display.width()-i*2, display.height()-i*2, INVERSE);
        display.display(); // Update screen with each newly-drawn rectangle
        delay(1);
      }
    
      delay(2000);
    }
    
    void testdrawcircle(void) {
      display.clearDisplay();
    
      for(int16_t i=0; i<max(display.width(),display.height())/2; i+=2) {
        display.drawCircle(display.width()/2, display.height()/2, i, WHITE);
        display.display();
        delay(1);
      }
    
      delay(2000);
    }
    
    void testfillcircle(void) {
      display.clearDisplay();
    
      for(int16_t i=max(display.width(),display.height())/2; i>0; i-=3) {
        // The INVERSE color is used so circles alternate white/black
        display.fillCircle(display.width() / 2, display.height() / 2, i, INVERSE);
        display.display(); // Update screen with each newly-drawn circle
        delay(1);
      }
    
      delay(2000);
    }
    
    void testdrawroundrect(void) {
      display.clearDisplay();
    
      for(int16_t i=0; i<display.height()/2-2; i+=2) {
        display.drawRoundRect(i, i, display.width()-2*i, display.height()-2*i,
          display.height()/4, WHITE);
        display.display();
        delay(1);
      }
    
      delay(2000);
    }
    
    void testfillroundrect(void) {
      display.clearDisplay();
    
      for(int16_t i=0; i<display.height()/2-2; i+=2) {
        // The INVERSE color is used so round-rects alternate white/black
        display.fillRoundRect(i, i, display.width()-2*i, display.height()-2*i,
          display.height()/4, INVERSE);
        display.display();
        delay(1);
      }
    
      delay(2000);
    }
    
    void testdrawtriangle(void) {
      display.clearDisplay();
    
      for(int16_t i=0; i<max(display.width(),display.height())/2; i+=5) {
        display.drawTriangle(
          display.width()/2  , display.height()/2-i,
          display.width()/2-i, display.height()/2+i,
          display.width()/2+i, display.height()/2+i, WHITE);
        display.display();
        delay(1);
      }
    
      delay(2000);
    }
    
    void testfilltriangle(void) {
      display.clearDisplay();
    
      for(int16_t i=max(display.width(),display.height())/2; i>0; i-=5) {
        // The INVERSE color is used so triangles alternate white/black
        display.fillTriangle(
          display.width()/2  , display.height()/2-i,
          display.width()/2-i, display.height()/2+i,
          display.width()/2+i, display.height()/2+i, INVERSE);
        display.display();
        delay(1);
      }
    
      delay(2000);
    }
    
    void testdrawchar(void) {
      display.clearDisplay();
    
      display.setTextSize(1);      // Normal 1:1 pixel scale
      display.setTextColor(WHITE); // Draw white text
      display.setCursor(0, 0);     // Start at top-left corner
      display.cp437(true);         // Use full 256 char 'Code Page 437' font
    
      // Not all the characters will fit on the display. This is normal.
      // Library will draw what it can and the rest will be clipped.
      for(int16_t i=0; i<256; i++) {
        if(i == '\n') display.write(' ');
        else          display.write(i);
      }
    
      display.display();
      delay(2000);
    }
    
    void testdrawstyles(void) {
      display.clearDisplay();
    
      display.setTextSize(1);             // Normal 1:1 pixel scale
      display.setTextColor(WHITE);        // Draw white text
      display.setCursor(0,0);             // Start at top-left corner
      display.println(F("Hello, world!"));
    
      display.setTextColor(BLACK, WHITE); // Draw 'inverse' text
      display.println(3.141592);
    
      display.setTextSize(2);             // Draw 2X-scale text
      display.setTextColor(WHITE);
      display.print(F("0x")); display.println(0xDEADBEEF, HEX);
    
      display.display();
      delay(2000);
    }
    
    void testscrolltext(void) {
      display.clearDisplay();
    
      display.setTextSize(2); // Draw 2X-scale text
      display.setTextColor(WHITE);
      display.setCursor(10, 0);
      display.println(F("scroll"));
      display.display();      // Show initial text
      delay(100);
    
      // Scroll in various directions, pausing in-between:
      display.startscrollright(0x00, 0x0F);
      delay(2000);
      display.stopscroll();
      delay(1000);
      display.startscrollleft(0x00, 0x0F);
      delay(2000);
      display.stopscroll();
      delay(1000);
      display.startscrolldiagright(0x00, 0x07);
      delay(2000);
      display.startscrolldiagleft(0x00, 0x07);
      delay(2000);
      display.stopscroll();
      delay(1000);
    }
    
    void testdrawbitmap(void) {
      display.clearDisplay();
    
      display.drawBitmap(
        (display.width()  - LOGO_WIDTH ) / 2,
        (display.height() - LOGO_HEIGHT) / 2,
        logo_bmp, LOGO_WIDTH, LOGO_HEIGHT, 1);
      display.display();
      delay(1000);
    }
    
    #define XPOS   0 // Indexes into the 'icons' array in function below
    #define YPOS   1
    #define DELTAY 2
    
    void testanimate(const uint8_t *bitmap, uint8_t w, uint8_t h) {
      int8_t f, icons[NUMFLAKES][3];
    
      // Initialize 'snowflake' positions
      for(f=0; f< NUMFLAKES; f++) {
        icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());
        icons[f][YPOS]   = -LOGO_HEIGHT;
        icons[f][DELTAY] = random(1, 6);
        Serial.print(F("x: "));
        Serial.print(icons[f][XPOS], DEC);
        Serial.print(F(" y: "));
        Serial.print(icons[f][YPOS], DEC);
        Serial.print(F(" dy: "));
        Serial.println(icons[f][DELTAY], DEC);
      }
    
      for(;;) { // Loop forever...
        display.clearDisplay(); // Clear the display buffer
    
        // Draw each snowflake:
        for(f=0; f< NUMFLAKES; f++) {
          display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, WHITE);
        }
    
        display.display(); // Show the display buffer on the screen
        delay(200);        // Pause for 1/10 second
    
        // Then update coordinates of each flake...
        for(f=0; f< NUMFLAKES; f++) {
          icons[f][YPOS] += icons[f][DELTAY];
          // If snowflake is off the bottom of the screen...
          if (icons[f][YPOS] >= display.height()) {
            // Reinitialize to a random position, just off the top
            icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());
            icons[f][YPOS]   = -LOGO_HEIGHT;
            icons[f][DELTAY] = random(1, 6);
          }
        }
      }
    }

这是我正在使用的库之一的示例,所以我不太了解它,无法有效地知道什么是错误的/什么可能是错误的。不确定实际 OLED 上的地址在哪里。

arduino oledb
1个回答
0
投票

@Mat 关于在同一 I2C 总线上连接多个设备的说法是正确的。如果要这样做,则必须使用上拉电阻,并且每个设备通常都有不同的地址。至少目前,只使用单个 OLED。

您使用的示例很复杂,这可能会使调试变得比实际需要的更加困难。我已经在 Arduino Mega 上运行了这个简短的程序,使用与您相同的连接,驱动 128x64 OLED,并且运行良好。

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(115200);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);   // Alternative: 0x3D
  delay(2000);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 10);
  // Display static text
  display.println("Hello, world!");
  display.display(); 
}

void loop() {
  
}

I2C地址正确至关重要,0x3C和0x3D是最有可能的。您可以使用简单的 Arduino I2C 扫描仪 程序检查 OLED 的 I2C 地址。这至少可以确认您已正确连接 OLED,并且您确切知道其地址。

但是,如果您仍然看到雪花图片,那是因为非 Adafruit 部件(常见于 eBay 上)并不总是能与 Adafruit GFX 库正常工作。当 Adafruit GFX 库只是给我雪花时,我发现有一个替代库可以在一些 128x64 OLED 上工作。 这是一个使用U8G库的教程。

这是一个使用 U8G 的简化示例。

#include <Arduino.h> #include <U8x8lib.h> // search for "u8g2" in the Library Manager #include <Wire.h> U8X8_SSD1306_128X64_NONAME_HW_I2C u8x8(/* reset=*/ U8X8_PIN_NONE); void setup(void) { u8x8.begin(); //u8x8.setFlipMode(1); u8x8.setFont(u8x8_font_chroma48medium8_r); //u8x8.clear(); u8x8.setCursor(2,2); u8x8.print("Hello World"); } void loop(void) { }
在这种情况下,您不需要提供总线地址,因为库代码会直接读取它。

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