weMosD1--12864 OLED/I2C显示

参考：https://wiki.wemos.cc/products:d1:d1?s[]=i2c
参考：https://wiki.wemos.cc/products:d1_mini_shields:oled_shield?s[]=i2c
GitHub：https://github.com/mcauser/Adafruit_SSD1306/tree/esp8266-64x48/examples/ssd1306_64x48_i2c

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使用arduino UNO R3 来显示I2C协议的12864OLED很容易，直接调用u8glib库就可以了，但是weMosD1WiFi模块就有点难了，找了很久才发现这个可以用的库。

引脚：

• OLED的SCL连接：D15/SCL
• OLED的SDA连接：D14/SDA

要安装库：https://github.com/mcauser/Adafruit_SSD1306

一、这个库I2C的地址只能用0X3C
二、显示字符

#include <SPI.h>#include <Wire.h>#include <Adafruit_GFX.h>#include <Adafruit_SSD1306.h>#define OLED_RESET 0  // GPIO0Adafruit_SSD1306 display(OLED_RESET);void setup()   {  Serial.begin(9600);  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 64x48)  // 初始化完成  display.clearDisplay(); // 清屏   // 文本显示测试  display.setTextSize(1);  display.setTextColor(WHITE);  display.setCursor(0,0);  display.println("Hello, world!");  display.setTextColor(BLACK, WHITE); // 'inverted' text  display.println(3.141592);  display.setTextSize(2);  display.setTextColor(WHITE);  display.print("0x"); display.println(0xDEADBEEF, HEX);  display.display();  delay(2000);  display.clearDisplay();  Serial.println("end");}void loop() {}

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全部的测试代码（这个代码是64X48，其他的不能用）：

/*********************************************************************This is an example for our Monochrome OLEDs based on SSD1306 drivers  Pick one up today in the adafruit shop!  ------> http://www.adafruit.com/category/63_98This example is for a 64x48 size display using I2C to communicate3 pins are required to interface (2 I2C and one reset)Adafruit invests time and resources providing this open source code,please support Adafruit and open-source hardware by purchasingproducts from Adafruit!Written by Limor Fried/Ladyada  for Adafruit Industries.BSD license, check license.txt for more informationAll text above, and the splash screen must be included in any redistribution*********************************************************************/#include <SPI.h>#include <Wire.h>#include <Adafruit_GFX.h>#include <Adafruit_SSD1306.h>// SCL GPIO5// SDA GPIO4#define OLED_RESET 0  // GPIO0Adafruit_SSD1306 display(OLED_RESET);#define NUMFLAKES 10#define XPOS 0#define YPOS 1#define DELTAY 2#define LOGO16_GLCD_HEIGHT 16#define LOGO16_GLCD_WIDTH  16static const unsigned char PROGMEM logo16_glcd_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 };#if (SSD1306_LCDHEIGHT != 48)#error("Height incorrect, please fix Adafruit_SSD1306.h!");#endifvoid setup()   {  Serial.begin(9600);  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 64x48)  // init done  // Show image buffer on the display hardware.  // Since the buffer is intialized with an Adafruit splashscreen  // internally, this will display the splashscreen.  display.display();  delay(2000);  // Clear the buffer.  display.clearDisplay();  // draw a single pixel  display.drawPixel(10, 10, WHITE);  // Show the display buffer on the hardware.  // NOTE: You _must_ call display after making any drawing commands  // to make them visible on the display hardware!  display.display();  delay(2000);  display.clearDisplay();  // draw many lines  testdrawline();  display.display();  delay(2000);  display.clearDisplay();  // draw rectangles  testdrawrect();  display.display();  delay(2000);  display.clearDisplay();  // draw multiple rectangles  testfillrect();  display.display();  delay(2000);  display.clearDisplay();  // draw mulitple circles  testdrawcircle();  display.display();  delay(2000);  display.clearDisplay();  // draw a white circle, 10 pixel radius  display.fillCircle(display.width()/2, display.height()/2, 10, WHITE);  display.display();  delay(2000);  display.clearDisplay();  testdrawroundrect();  delay(2000);  display.clearDisplay();  testfillroundrect();  delay(2000);  display.clearDisplay();  testdrawtriangle();  delay(2000);  display.clearDisplay();  testfilltriangle();  delay(2000);  display.clearDisplay();  // draw the first ~12 characters in the font  testdrawchar();  display.display();  delay(2000);  display.clearDisplay();  // draw scrolling text  testscrolltext();  delay(2000);  display.clearDisplay();  // text display tests  display.setTextSize(1);  display.setTextColor(WHITE);  display.setCursor(0,0);  display.println("Hello, world!");  display.setTextColor(BLACK, WHITE); // 'inverted' text  display.println(3.141592);  display.setTextSize(2);  display.setTextColor(WHITE);  display.print("0x"); display.println(0xDEADBEEF, HEX);  display.display();  delay(2000);  display.clearDisplay();  // miniature bitmap display  display.drawBitmap(30, 16,  logo16_glcd_bmp, 16, 16, 1);  display.display();  delay(1);  // invert the display  display.invertDisplay(true);  delay(1000);  display.invertDisplay(false);  delay(1000);  display.clearDisplay();  // draw a bitmap icon and 'animate' movement  testdrawbitmap(logo16_glcd_bmp, LOGO16_GLCD_HEIGHT, LOGO16_GLCD_WIDTH);}void loop() {}void testdrawbitmap(const uint8_t *bitmap, uint8_t w, uint8_t h) {  uint8_t icons[NUMFLAKES][3];  // initialize  for (uint8_t f=0; f< NUMFLAKES; f++) {    icons[f][XPOS] = random(display.width());    icons[f][YPOS] = 0;    icons[f][DELTAY] = random(5) + 1;    Serial.print("x: ");    Serial.print(icons[f][XPOS], DEC);    Serial.print(" y: ");    Serial.print(icons[f][YPOS], DEC);    Serial.print(" dy: ");    Serial.println(icons[f][DELTAY], DEC);  }  while (1) {    // draw each icon    for (uint8_t f=0; f< NUMFLAKES; f++) {      display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, WHITE);    }    display.display();    delay(200);    // then erase it + move it    for (uint8_t f=0; f< NUMFLAKES; f++) {      display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, BLACK);      // move it      icons[f][YPOS] += icons[f][DELTAY];      // if its gone, reinit      if (icons[f][YPOS] > display.height()) {        icons[f][XPOS] = random(display.width());        icons[f][YPOS] = 0;        icons[f][DELTAY] = random(5) + 1;      }    }   }}void testdrawchar(void) {  display.setTextSize(1);  display.setTextColor(WHITE);  display.setCursor(0,0);  for (uint8_t i=0; i < 168; i++) {    if (i == '\n') continue;    display.write(i);    if ((i > 0) && (i % 21 == 0))      display.println();  }  display.display();  delay(1);}void testdrawcircle(void) {  for (int16_t i=0; i<display.height(); i+=2) {    display.drawCircle(display.width()/2, display.height()/2, i, WHITE);    display.display();    delay(1);  }}void testfillrect(void) {  uint8_t color = 1;  for (int16_t i=0; i<display.height()/2; i+=3) {    // alternate colors    display.fillRect(i, i, display.width()-i*2, display.height()-i*2, color%2);    display.display();    delay(1);    color++;  }}void testdrawtriangle(void) {  for (int16_t i=0; i<min(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);  }}void testfilltriangle(void) {  uint8_t color = WHITE;  for (int16_t i=min(display.width(),display.height())/2; i>0; i-=5) {    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, WHITE);    if (color == WHITE) color = BLACK;    else color = WHITE;    display.display();    delay(1);  }}void testdrawroundrect(void) {  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);  }}void testfillroundrect(void) {  uint8_t color = WHITE;  for (int16_t i=0; i<display.height()/2-2; i+=2) {    display.fillRoundRect(i, i, display.width()-2*i, display.height()-2*i, display.height()/4, color);    if (color == WHITE) color = BLACK;    else color = WHITE;    display.display();    delay(1);  }}void testdrawrect(void) {  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();    delay(1);  }}void testdrawline() {  for (int16_t i=0; i<display.width(); i+=4) {    display.drawLine(0, 0, i, display.height()-1, WHITE);    display.display();    delay(1);  }  for (int16_t 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 (int16_t i=0; i<display.width(); i+=4) {    display.drawLine(0, display.height()-1, i, 0, WHITE);    display.display();    delay(1);  }  for (int16_t 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 (int16_t i=display.width()-1; i>=0; i-=4) {    display.drawLine(display.width()-1, display.height()-1, i, 0, WHITE);    display.display();    delay(1);  }  for (int16_t 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 (int16_t i=0; i<display.height(); i+=4) {    display.drawLine(display.width()-1, 0, 0, i, WHITE);    display.display();    delay(1);  }  for (int16_t i=0; i<display.width(); i+=4) {    display.drawLine(display.width()-1, 0, i, display.height()-1, WHITE);    display.display();    delay(1);  }  delay(250);}void testscrolltext(void) {  display.setTextSize(2);  display.setTextColor(WHITE);  display.setCursor(10,0);  display.clearDisplay();  display.println("scroll");  display.display();  delay(1);  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();}