安信可小安派BW21-CBV-Kit+OLED

使用安信可小安派BW21-CBV-Kit开发板进行I2C设备扫描的，驱动OLED显示。

开发平台：Arduino IDE

开发板：小安派BW21-CBV-Kit

模块:OLED

功能：使用开发板实现OLED显示.

1、硬件连接确认

确保开发板与OLED模块的连接正确：

OLED_SCL → GPIO13 (I2C时钟线)

OLED_SDA → GPIO12 (I2C数据线)

共地连接→GND

电源→5V。

2、代码

#include <Wire.h>
#include <Adafruit_OLED_libraries/Adafruit_GFX.h>
#include <Adafruit_OLED_libraries/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)
// The pins for I2C are defined by the Wire-library.
#define OLED_RESET     -1      // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C    ///< See datasheet for Address
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define NUMFLAKES 10    // Number of snowflakes in the animation example

#define LOGO_HEIGHT_FLAKES 16
#define LOGO_WIDTH_FLAKES  16
static const unsigned char PROGMEM logo_bmp_flake[] =
    {0b00000000, 0b11000000,
     0b00000001, 0b11000000,
     0b00000001, 0b11000000,
     0b00000011, 0b11100000,
     0b11110011, 0b11100000,
     0b11111110, 0b11111000,
     0b01111110, 0b11111111,
     0b00110011, 0b10011111,
     0b00011111, 0b11111100,
     0b00001101, 0b01110000,
     0b00011011, 0b10100000,
     0b00111111, 0b11100000,
     0b00111111, 0b11110000,
     0b01111100, 0b11110000,
     0b01110000, 0b01110000,
     0b00000000, 0b00110000};

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

    // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
    if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
        Serial.println(F("SSD1306 allocation failed"));
        for (;;)
            ;    // Don't proceed, loop forever
    }

    // Clear the buffer
    display.clearDisplay();

    // Show the display buffer on the screen. You MUST call display() after
    // drawing commands to make them visible on screen!
    display.display();
    delay(500);

    testanimate(logo_bmp_flake, LOGO_WIDTH_FLAKES, LOGO_HEIGHT_FLAKES);    // Animate bitmaps
}

void loop()
{
}

#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_FLAKES, display.width());
        icons[f][YPOS] = -LOGO_HEIGHT_FLAKES;
        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, SSD1306_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_FLAKES, display.width());
                icons[f][YPOS] = -LOGO_HEIGHT_FLAKES;
                icons[f][DELTAY] = random(1, 6);
            }
        }
    }
}

OLED屏幕初始化

使用IIC通信，地址为0x3C。SSD1306_SWITCHCAPVCC表示内部升压生成驱动电压。

其中16x16像素的二进制位图，每行2字节，MSB优先。

clearDisplay() → 绘制 → display() 避免闪烁，drawBitmap直接操作显存，比逐像素绘制高效，random()函数生成动态效果。

3.软件界面代码操作

注意：

当开发板连接电脑后，刚开始找不到端口，需要进行如下操作，按住左边boot按键不松手，再点击一下右边reset按键,1-2秒内可以观察到蓝灯逐渐亮起来，蓝灯亮起来红，此时松开左边boot按键，开发板进入烧录模式，不过有时按下BOOT后，再按RESET就可以了。

在这里选择开发板型号就可以进行上传了。

上传完成什么会出现End Upload Flash，按一下开发板的RESET就可以看到实际的现象了。

4、连接图

5、实现视频

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很棒！

是煤老板吗？

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