Adafruit-GFX-Library

该类库为所有彩色屏幕的基础类库，安装方式：在Arduino的项目-加载库-库管理器中搜索Adafruit GFX Library，选择最新版本进行安装。Github下载地址
Arduino中的第三方库的存放地址可以在首选项-项目文件夹位置处查看，该路径下的libraries文件夹下即为第三方库的存放地址。

Arduino-ST7789-Library

该类库为ST7789的专用驱动库。Github下载地址
运行画直线的程序，用时约32.6s，太慢了，每次黑屏都要等半天！

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#include <Adafruit_GFX.h>    // Core graphics library by Adafruit
#include <Arduino_ST7789.h> // Hardware-specific library for ST7789 (with or without CS pin)
#include <SPI.h>

#define TFT_DC    8
#define TFT_RST   7  //9 
#define TFT_CS    9  //10 // only for displays with CS pin
#define TFT_MOSI  11   // for hardware SPI data pin (all of available pins)
#define TFT_SCLK  13   // for hardware SPI sclk pin (all of available pins)

#define w 240
#define h 240


Arduino_ST7789 tft = Arduino_ST7789(TFT_DC, TFT_RST, TFT_MOSI, TFT_SCLK, TFT_CS); //for display with CS pin

static inline uint32_t micros_start() __attribute__((always_inline));
static inline uint32_t micros_start()
{
  uint8_t oms = millis();
  while ((uint8_t)millis() == oms)
    ;
  return micros();
}


void setup(){
  Serial.begin(9600);
  tft.init(w, h);
}

void loop(){
  uint32_t start = micros_start();

  tft.fillScreen(BLACK);
  testLines();
  
  uint32_t usecLines = micros() - start;
  tft.setCursor(0, 20);
  tft.setTextSize(3);
  tft.setTextColor(RED);
  tft.println("Cost Time:");

  tft.setCursor(0, 50);
  tft.setTextSize(4);
  tft.setTextColor(RED);
  tft.println(usecLines);

  delay(60 * 1000L);
}

int32_t testLines()
{
  uint32_t start;
  int32_t x1, y1, x2, y2;

  start = micros_start();

  x1 = y1 = 0;
  y2 = h - 1;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = w - 1;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x1 = w - 1;
  y1 = 0;
  y2 = h - 1;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = 0;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x1 = 0;
  y1 = h - 1;
  y2 = 0;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = w - 1;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x1 = w - 1;
  y1 = h - 1;
  y2 = 0;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = 0;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    tft.drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  return micros() - start;
}

Arduino_GFX

安装方式：在Arduino的项目-加载库-库管理器中搜索GFX Library For Arduino，选择最新版本进行安装。Github下载地址
运行画直线的程序，用时约5.7s，速度超级快！在测试Arduino_GFX的时候还发生了一个小插曲，我连线明明是正确的，但屏幕没有任何反应，排了很久的bug，最后发现是我的arduino开发板有问题，果然太便宜了容易出问题，以后还是用正版的arduino开发板吧！

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#include <Arduino_GFX_Library.h>
int32_t w, h;

/* More dev device declaration: https://github.com/moononournation/Arduino_GFX/wiki/Dev-Device-Declaration */
#if defined(DISPLAY_DEV_KIT)
Arduino_GFX *gfx = create_default_Arduino_GFX();
#else /* !defined(DISPLAY_DEV_KIT) */

/* More data bus class: https://github.com/moononournation/Arduino_GFX/wiki/Data-Bus-Class */
Arduino_DataBus *bus = create_default_Arduino_DataBus();

/* More display class: https://github.com/moononournation/Arduino_GFX/wiki/Display-Class */
Arduino_GFX *gfx = new Arduino_ST7789(bus, DF_GFX_RST, 0 /* rotation */, true /* IPS */);

#endif /* !defined(DISPLAY_DEV_KIT) */

static inline uint32_t micros_start() __attribute__((always_inline));
static inline uint32_t micros_start()
{
  uint8_t oms = millis();
  while ((uint8_t)millis() == oms)
    ;
  return micros();
}

void setup(){
  Serial.begin(9600);
  gfx->begin();
  w = gfx->width();
  h = gfx->height();

  #ifdef DF_GFX_BL
    pinMode(DF_GFX_BL, OUTPUT);
    digitalWrite(DF_GFX_BL, HIGH);
  #endif
}

void loop(){
  uint32_t start = micros_start();

  gfx->fillScreen(BLACK);
  testLines();
  
  uint32_t usecLines = micros() - start;

  gfx->setCursor(0, 20);
  gfx->setTextSize(3);
  gfx->setTextColor(RED);
  gfx->println(F("Cost Time:"));

  gfx->setCursor(0, 50);
  gfx->setTextSize(4);
  gfx->setTextColor(RED);
  gfx->println(usecLines);

  delay(60 * 1000L);
}

int32_t testLines()
{
  uint32_t start;
  int32_t x1, y1, x2, y2;

  start = micros_start();

  x1 = y1 = 0;
  y2 = h - 1;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = w - 1;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x1 = w - 1;
  y1 = 0;
  y2 = h - 1;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = 0;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x1 = 0;
  y1 = h - 1;
  y2 = 0;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = w - 1;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x1 = w - 1;
  y1 = h - 1;
  y2 = 0;
  for (x2 = 0; x2 < w; x2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  x2 = 0;
  for (y2 = 0; y2 < h; y2 += 6)
  {
    gfx->drawLine(x1, y1, x2, y2, BLUE);
  }
#ifdef ESP8266
    yield(); // avoid long run triggered ESP8266 WDT restart
#endif

  return micros() - start;
}

TFT_eSPI

在Arduino的库管理器中搜索TFT_eSPI，安装最新版本。Github下载地址经测试，这个库太大了，arduino uno开发板无法成功上传。

参考内容