課程目標(biāo)

• 取模軟件的使用
• OLED中文字符的顯示

相關(guān)知識(shí)

**字模顯示原理：**我們使用的OLED屏是由方形的發(fā)光點(diǎn)陣列組成的，分辨率為128x64。英文和數(shù)字最小可用8x8像素，漢字最小顯示像素為16x16，通常為了顯示效果，英文和數(shù)字通常使用8x16像素表示，稱為1608字體。

在OLED顯示屏上顯示字符,和在點(diǎn)陣上顯示圖像是一樣的都是通過區(qū)域內(nèi)的像素點(diǎn)的亮暗來呈現(xiàn)圖案。

**1608字體：**1608代表著字符顯示的區(qū)域大小,即高度16位*寬度8位

**PCtoLCD取模軟件：**我們可以通過取模軟件來自動(dòng)生成想要顯示的文字編碼。這里重點(diǎn)講一下PCtoLCD軟件的應(yīng)用。

取模軟件的使用：

1、啟動(dòng)軟件，點(diǎn)擊「模式」，選擇「字符模式」。

2、點(diǎn)擊「選項(xiàng)」進(jìn)行字模配置。通常字模配置要根據(jù)程序驅(qū)動(dòng)方式來選擇，我們選擇陰碼、逐行式、順向，其他選項(xiàng)如下圖所示。

3、輸入漢字。點(diǎn)擊生成字?；蛘弑４孀帜＃蜁?huì)得到對(duì)應(yīng)的點(diǎn)陣數(shù)據(jù)。

電路搭建

所需材料

ArduinoUNO * 1
OLED顯示屏 * 1
杜邦線若干

電路連接

OLED屏的VCC和GND分別連接開發(fā)板的5V和GND，OLED屏的SDA和SCL分別連接開發(fā)板A4和A5。

程序編寫

練習(xí)一：OLED顯示中文字符

通過取模軟件，將需要顯示的中文進(jìn)行轉(zhuǎn)換。然后編寫程序，讓OLED能夠顯示出來。圖形化方式這里不做贅述，主要通過代碼的方式來實(shí)現(xiàn)。

代碼方式：

/* 項(xiàng)目名稱:OLED顯示中文
   項(xiàng)目時(shí)間:2022.03.17
   項(xiàng)目作者:MRX
*/
#include < Wire.h >
#include < Adafruit_GFX.h >
#include < Adafruit_SSD1306.h >


#define OLED_RESET     4
Adafruit_SSD1306 display(128, 64, &Wire, OLED_RESET);


//取16X16漢字字模 逐行式 順向高位在前
static const unsigned char PROGMEM str1[] =
{
  0x10,0x20,0x10,0x20,0x10,0x20,0x10,0x20,0xFD,0xFE,0x24,0x20,0x24,0x20,0x24,0x20,
  0x25,0xFC,0x49,0x04,0x29,0x04,0x11,0x04,0x29,0x04,0x45,0x04,0x85,0xFC,0x01,0x04

};/*"姑",0*/


static const unsigned char PROGMEM str2[] =
{
  0x08,0x20,0x08,0x20,0xFF,0xFE,0x08,0x20,0x0A,0x20,0x02,0x00,0x7F,0xF0,0x02,0x10,
  0x02,0x14,0x22,0x12,0x22,0x12,0x24,0x12,0x44,0x10,0x08,0x10,0x10,0xA0,0x20,0x40


};/*"蘇",1*/
static const unsigned char PROGMEM str3[] =
{
  0x20,0x28,0x20,0x24,0x20,0x20,0x27,0xFE,0x24,0x20,0xFC,0x20,0x24,0x24,0x27,0xA4,
  0x24,0xA4,0x24,0xA8,0x24,0xA8,0x3C,0x90,0xE6,0x92,0x49,0x2A,0x08,0x46,0x10,0x82


};/*"城",2*/


static const unsigned char PROGMEM str4[] =
{
  0x10,0x40,0x10,0x40,0x10,0x40,0x10,0x40,0x3E,0x40,0x22,0x60,0x42,0x50,0x42,0x48,
  0xA4,0x44,0x14,0x44,0x08,0x40,0x08,0x40,0x10,0x40,0x20,0x40,0x40,0x40,0x80,0x40


};/*"外",3*/


static const unsigned char PROGMEM str5[] =
{
  0x02,0x00,0x01,0x00,0x7F,0xFE,0x44,0x42,0x9F,0xF4,0x04,0x40,0x3F,0xF8,0x04,0x40,
  0xFF,0xFE,0x08,0x20,0x13,0x10,0x20,0x88,0xC0,0x46,0x06,0x00,0x01,0x80,0x00,0x40


};/*"寒",4*/


static const unsigned char PROGMEM str6[] =
{
  0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x21,0x08,0x21,0x08,0x21,0x08,0x21,0x08,
  0x21,0x08,0x21,0x08,0x21,0x08,0x21,0x08,0x21,0x08,0x3F,0xF8,0x00,0x08,0x00,0x00


};/*"山",5*/


static const unsigned char PROGMEM str7[] =
{
  0x01,0x00,0x01,0x00,0x01,0x00,0x3F,0xF8,0x01,0x00,0x01,0x00,0xFF,0xFE,0x00,0x20,
  0x00,0x20,0x7F,0xFC,0x08,0x20,0x04,0x20,0x04,0x20,0x00,0x20,0x00,0xA0,0x00,0x40


};/*"寺",6*/


void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.setTextColor(WHITE);//開像素點(diǎn)發(fā)光
  display.clearDisplay();//清屏


  display.setTextSize(1); //設(shè)置字體大小
  display.setCursor(35, 5);//設(shè)置顯示位置
  display.println("-MRXCLASS-");//輸出字符


  display.drawBitmap(10, 32, str1, 16, 16, 1); //畫出字符對(duì)應(yīng)點(diǎn)陣數(shù)據(jù)
  display.drawBitmap(26, 32, str2, 16, 16, 1); //畫出字符對(duì)應(yīng)點(diǎn)陣數(shù)據(jù)
  display.drawBitmap(42, 32, str3, 16, 16, 1); //畫出字符對(duì)應(yīng)點(diǎn)陣數(shù)據(jù)
  display.drawBitmap(58, 32, str4, 16, 16, 1); //畫出字符對(duì)應(yīng)點(diǎn)陣數(shù)據(jù)
  display.drawBitmap(74, 32, str5, 16, 16, 1); //畫出字符對(duì)應(yīng)點(diǎn)陣數(shù)據(jù)
  display.drawBitmap(90, 32, str6, 16, 16, 1); //畫出字符對(duì)應(yīng)點(diǎn)陣數(shù)據(jù)
  display.drawBitmap(106, 32, str7, 16, 16, 1); //畫出字符對(duì)應(yīng)點(diǎn)陣數(shù)據(jù)
  display.display();//開顯示                


}


void loop() {


}

演示圖片：

代碼分析：

程序中我們使用了圖像庫(kù)「Adafruit_GFX」中的drawBitmap()函數(shù)進(jìn)行位圖繪制，函數(shù)參數(shù)分別輸入了要顯示的坐標(biāo)，字符數(shù)據(jù)源，字符的寬高，最后參數(shù)由于我們的OLED是單色的，默認(rèn)為1**。**

void drawBitmap(int16_t x, int16_t y, uint8_t *bitmap, int16_t w, int16_t h, uint16_t color);

這會(huì)在一部分顯示區(qū)域中發(fā)出連續(xù)的位信息。這里1代表是像素被設(shè)置成規(guī)定的顏色，0就是不設(shè)置像素的顏色。x，y是位圖左上角，w和h是寬度和高度。