ESP32+TFT屏幕连接无线局域网投屏

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前言

首先，本教程参考B站UP主super大大怪i的开源资料，在此对UP主表示感谢，本人在此基础上做了一些改动以适配我的屏幕和单片机，在下文会提到。本方案实现起来并不困难，硬件比较简单，大约几个小时就可以搞定。然后你就可以在单片机的屏幕上开心地玩原神了。

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一、硬件准备

首先你需要一块ESP32开发板，本人使用的是一块ESP32-WROOM-32核心板，关于ESP32各个型号的区别可以进入乐鑫官网查看。

其次是一块屏幕，我使用的是一块2.8寸（240*320）的tft屏幕，原作者使用的屏幕尺寸较小，故换了块大的，驱动是ST7789，使用spi通信协议。

电脑，这个不用说了。
能开热点的手机，因为ESP32无法连接处2.4G网络外的其他网络，校园网可能连不上，所以最好用手机开热点使用。

二、软件准备

1.下载Arduino IDE

Arduino IDE这个是我们的编译环境，之前也试过PIO感觉不稳定所以没用，Arduino IDE推荐大家到Arduino的官网下载，最新的版本是2.0新添加了很多功能，颜值也很高，强烈推荐下最新版。

2.配置ESP32的开发环境

软件下载完成之后需要配置ESP32的开发环境，打开Arduino IDE的界面，点击文件------>首选项
在打开的界面中粘贴如下语句，点击确定

https://dl.espressif.com/dl/package_esp32_index.json

接着重启软件，点击工具------>开发板------>开发板管理器，搜索栏输入ESP32点击第一个下载即可

下载完成后再次重启软件，点击开发板找到ESP32 Arduino，选择ESP32 Dev Module

如图所示，配置完成

3.导入所需要的库

我们需要导入TFT_eSPI和TJpg_Decoder两个库，TFT_eSPI是一个功能强大的TFT屏幕驱动库，TJpg_Decoder库用于JEPG的解码。
在管理库中搜索tft,下载TFT_eSPI库，TJpg_Decoder库同理

添加完成后可以在库中找到相应的库文件

三、 硬件连接

#define TFT_MOSI 13 // In some display driver board, it might be written as "SDA" and so on.
#define TFT_SCLK 14
#define TFT_CS   15  // Chip select control pin
#define TFT_DC   2  // Data Command control pin
#define TFT_RST  4 // Reset pin (could connect to Arduino RESET pin)
#define TFT_BL   33  // LED back-light

另外，tft屏幕的VCC需要连接单片机上的5V引脚，屏幕需要和单片机共地。
可以使用面包板制作，当然，也可以和我一样使用洞洞板，这样会极大地增加稳定性。

四、 代码

在编写程序之前，首先需要对TFT_eSPI这个库中地部分定义更改以适应我的屏幕，打开Aruino的库文件保存目录，我的在C:\Users\expert\OneDrive\文档\Arduino\libraries（每个人的目录位置可能不同），打开找到TFT_eSPI
找到User_Setup.h这个头文件，用notepad++或者记事本打开

我们需要做如下改动，选择屏幕驱动这里我用的是ST7789

选择使用BGR配色方案，这里如果选择了RGB屏幕颜色可能会反转

选择屏幕的分辨率，我的屏幕是320*240

选择屏幕的SPI驱动引脚，这里我就使用了ESP32默认的就好（理论上来说可以把引脚配置到任意的GPIO上）

其他的配置默认即可

总体头文件如下

//                            USER DEFINED SETTINGS
//   Set driver type, fonts to be loaded, pins used and SPI control method etc
//
//   See the User_Setup_Select.h file if you wish to be able to define multiple
//   setups and then easily select which setup file is used by the compiler.
//
//   If this file is edited correctly then all the library example sketches should
//   run without the need to make any more changes for a particular hardware setup!
//   Note that some sketches are designed for a particular TFT pixel width/height

// User defined information reported by "Read_User_Setup" test & diagnostics example
#define USER_SETUP_INFO "User_Setup"

// Define to disable all #warnings in library (can be put in User_Setup_Select.h)
//#define DISABLE_ALL_LIBRARY_WARNINGS

// ##################################################################################
//
// Section 1. Call up the right driver file and any options for it
//
// ##################################################################################

// Define STM32 to invoke optimised processor support (only for STM32)
//#define STM32

// Defining the STM32 board allows the library to optimise the performance
// for UNO compatible "MCUfriend" style shields
//#define NUCLEO_64_TFT
//#define NUCLEO_144_TFT

// STM32 8 bit parallel only:
// If STN32 Port A or B pins 0-7 are used for 8 bit parallel data bus bits 0-7
// then this will improve rendering performance by a factor of ~8x
//#define STM_PORTA_DATA_BUS
//#define STM_PORTB_DATA_BUS

// Tell the library to use parallel mode (otherwise SPI is assumed)
//#define TFT_PARALLEL_8_BIT
//#defined TFT_PARALLEL_16_BIT // **** 16 bit parallel ONLY for RP2040 processor ****

// Display type -  only define if RPi display
//#define RPI_DISPLAY_TYPE // 20MHz maximum SPI

// Only define one driver, the other ones must be commented out
//#define ILI9341_DRIVER       // Generic driver for common displays
//#define ILI9341_2_DRIVER     // Alternative ILI9341 driver, see https://github.com/Bodmer/TFT_eSPI/issues/1172
//#define ST7735_DRIVER      // Define additional parameters below for this display
//#define ILI9163_DRIVER     // Define additional parameters below for this display
//#define S6D02A1_DRIVER
//#define RPI_ILI9486_DRIVER // 20MHz maximum SPI
//#define HX8357D_DRIVER
//#define ILI9481_DRIVER
//#define ILI9486_DRIVER
//#define ILI9488_DRIVER     // WARNING: Do not connect ILI9488 display SDO to MISO if other devices share the SPI bus (TFT SDO does NOT tristate when CS is high)
#define ST7789_DRIVER      // Full configuration option, define additional parameters below for this display
//#define ST7789_2_DRIVER    // Minimal configuration option, define additional parameters below for this display
//#define R61581_DRIVER
//#define RM68140_DRIVER
//#define ST7796_DRIVER
//#define SSD1351_DRIVER
//#define SSD1963_480_DRIVER
//#define SSD1963_800_DRIVER
//#define SSD1963_800ALT_DRIVER
//#define ILI9225_DRIVER
//#define GC9A01_DRIVER

// Some displays support SPI reads via the MISO pin, other displays have a single
// bi-directional SDA pin and the library will try to read this via the MOSI line.
// To use the SDA line for reading data from the TFT uncomment the following line:

// #define TFT_SDA_READ      // This option is for ESP32 ONLY, tested with ST7789 and GC9A01 display only

// For ST7735, ST7789 and ILI9341 ONLY, define the colour order IF the blue and red are swapped on your display
// Try ONE option at a time to find the correct colour order for your display

 //#define TFT_RGB_ORDER TFT_RGB  // Colour order Red-Green-Blue
  #define TFT_RGB_ORDER TFT_BGR  // Colour order Blue-Green-Red

// For M5Stack ESP32 module with integrated ILI9341 display ONLY, remove // in line below

// #define M5STACK

// For ST7789, ST7735, ILI9163 and GC9A01 ONLY, define the pixel width and height in portrait orientation
// #define TFT_WIDTH  80
// #define TFT_WIDTH  128
// #define TFT_WIDTH  172 // ST7789 172 x 320
 #define TFT_WIDTH  240 // ST7789 240 x 240 and 240 x 320
// #define TFT_HEIGHT 160
// #define TFT_HEIGHT 128
// #define TFT_HEIGHT 240 // ST7789 240 x 240
 #define TFT_HEIGHT 320 // ST7789 240 x 320
// #define TFT_HEIGHT 240 // GC9A01 240 x 240

// For ST7735 ONLY, define the type of display, originally this was based on the
// colour of the tab on the screen protector film but this is not always true, so try
// out the different options below if the screen does not display graphics correctly,
// e.g. colours wrong, mirror images, or stray pixels at the edges.
// Comment out ALL BUT ONE of these options for a ST7735 display driver, save this
// this User_Setup file, then rebuild and upload the sketch to the board again:

// #define ST7735_INITB
// #define ST7735_GREENTAB
// #define ST7735_GREENTAB2
// #define ST7735_GREENTAB3
// #define ST7735_GREENTAB128    // For 128 x 128 display
// #define ST7735_GREENTAB160x80 // For 160 x 80 display (BGR, inverted, 26 offset)
// #define ST7735_REDTAB
// #define ST7735_BLACKTAB
// #define ST7735_REDTAB160x80   // For 160 x 80 display with 24 pixel offset

// If colours are inverted (white shows as black) then uncomment one of the next
// 2 lines try both options, one of the options should correct the inversion.

// #define TFT_INVERSION_ON
#define TFT_INVERSION_OFF


// ##################################################################################
//
// Section 2. Define the pins that are used to interface with the display here
//
// ##################################################################################

// If a backlight control signal is available then define the TFT_BL pin in Section 2
// below. The backlight will be turned ON when tft.begin() is called, but the library
// needs to know if the LEDs are ON with the pin HIGH or LOW. If the LEDs are to be
// driven with a PWM signal or turned OFF/ON then this must be handled by the user
// sketch. e.g. with digitalWrite(TFT_BL, LOW);

// #define TFT_BL   32            // LED back-light control pin
// #define TFT_BACKLIGHT_ON HIGH  // Level to turn ON back-light (HIGH or LOW)



// We must use hardware SPI, a minimum of 3 GPIO pins is needed.
// Typical setup for ESP8266 NodeMCU ESP-12 is :
//
// Display SDO/MISO  to NodeMCU pin D6 (or leave disconnected if not reading TFT)
// Display LED       to NodeMCU pin VIN (or 5V, see below)
// Display SCK       to NodeMCU pin D5
// Display SDI/MOSI  to NodeMCU pin D7
// Display DC (RS/AO)to NodeMCU pin D3
// Display RESET     to NodeMCU pin D4 (or RST, see below)
// Display CS        to NodeMCU pin D8 (or GND, see below)
// Display GND       to NodeMCU pin GND (0V)
// Display VCC       to NodeMCU 5V or 3.3V
//
// The TFT RESET pin can be connected to the NodeMCU RST pin or 3.3V to free up a control pin
//
// The DC (Data Command) pin may be labelled AO or RS (Register Select)
//
// With some displays such as the ILI9341 the TFT CS pin can be connected to GND if no more
// SPI devices (e.g. an SD Card) are connected, in this case comment out the #define TFT_CS
// line below so it is NOT defined. Other displays such at the ST7735 require the TFT CS pin
// to be toggled during setup, so in these cases the TFT_CS line must be defined and connected.
//
// The NodeMCU D0 pin can be used for RST
//
//
// Note: only some versions of the NodeMCU provide the USB 5V on the VIN pin
// If 5V is not available at a pin you can use 3.3V but backlight brightness
// will be lower.


// ###### EDIT THE PIN NUMBERS IN THE LINES FOLLOWING TO SUIT YOUR ESP8266 SETUP ######

// For NodeMCU - use pin numbers in the form PIN_Dx where Dx is the NodeMCU pin designation
#define TFT_CS   PIN_D8  // Chip select control pin D8
#define TFT_DC   PIN_D3  // Data Command control pin
#define TFT_RST  PIN_D4  // Reset pin (could connect to NodeMCU RST, see next line)
//#define TFT_RST  -1    // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V

//#define TFT_BL PIN_D1  // LED back-light (only for ST7789 with backlight control pin)

//#define TOUCH_CS PIN_D2     // Chip select pin (T_CS) of touch screen

//#define TFT_WR PIN_D2       // Write strobe for modified Raspberry Pi TFT only


// ######  FOR ESP8266 OVERLAP MODE EDIT THE PIN NUMBERS IN THE FOLLOWING LINES  ######

// Overlap mode shares the ESP8266 FLASH SPI bus with the TFT so has a performance impact
// but saves pins for other functions. It is best not to connect MISO as some displays
// do not tristate that line when chip select is high!
// Note: Only one SPI device can share the FLASH SPI lines, so a SPI touch controller
// cannot be connected as well to the same SPI signals.
// On NodeMCU 1.0 SD0=MISO, SD1=MOSI, CLK=SCLK to connect to TFT in overlap mode
// On NodeMCU V3  S0 =MISO, S1 =MOSI, S2 =SCLK
// In ESP8266 overlap mode the following must be defined

//#define TFT_SPI_OVERLAP

// In ESP8266 overlap mode the TFT chip select MUST connect to pin D3
//#define TFT_CS   PIN_D3
//#define TFT_DC   PIN_D5  // Data Command control pin
//#define TFT_RST  PIN_D4  // Reset pin (could connect to NodeMCU RST, see next line)
//#define TFT_RST  -1  // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V


// ###### EDIT THE PIN NUMBERS IN THE LINES FOLLOWING TO SUIT YOUR ESP32 SETUP   ######

// For ESP32 Dev board (only tested with ILI9341 display)
// The hardware SPI can be mapped to any pins

//#define TFT_MISO 19
//#define TFT_MOSI 23
//#define TFT_SCLK 18
//#define TFT_CS   15  // Chip select control pin
//#define TFT_DC    2  // Data Command control pin
//#define TFT_RST   4  // Reset pin (could connect to RST pin)
//#define TFT_RST  -1  // Set TFT_RST to -1 if display RESET is connected to ESP32 board RST

// For ESP32 Dev board (only tested with GC9A01 display)
// The hardware SPI can be mapped to any pins

#define TFT_MOSI 13 // In some display driver board, it might be written as "SDA" and so on.
#define TFT_SCLK 14
#define TFT_CS   15  // Chip select control pin
#define TFT_DC   2  // Data Command control pin
#define TFT_RST  4 // Reset pin (could connect to Arduino RESET pin)
#define TFT_BL   33  // LED back-light

//#define TOUCH_CS 21     // Chip select pin (T_CS) of touch screen

//#define TFT_WR 22    // Write strobe for modified Raspberry Pi TFT only

// For the M5Stack module use these #define lines
//#define TFT_MISO 19
//#define TFT_MOSI 23
//#define TFT_SCLK 18
//#define TFT_CS   14  // Chip select control pin
//#define TFT_DC   27  // Data Command control pin
//#define TFT_RST  33  // Reset pin (could connect to Arduino RESET pin)
//#define TFT_BL   32  // LED back-light (required for M5Stack)

// ######       EDIT THE PINs BELOW TO SUIT YOUR ESP32 PARALLEL TFT SETUP        ######

// The library supports 8 bit parallel TFTs with the ESP32, the pin
// selection below is compatible with ESP32 boards in UNO format.
// Wemos D32 boards need to be modified, see diagram in Tools folder.
// Only ILI9481 and ILI9341 based displays have been tested!

// Parallel bus is only supported for the STM32 and ESP32
// Example below is for ESP32 Parallel interface with UNO displays

// Tell the library to use 8 bit parallel mode (otherwise SPI is assumed)
//#define TFT_PARALLEL_8_BIT

// The ESP32 and TFT the pins used for testing are:
//#define TFT_CS   33  // Chip select control pin (library pulls permanently low
//#define TFT_DC   15  // Data Command control pin - must use a pin in the range 0-31
//#define TFT_RST  32  // Reset pin, toggles on startup

//#define TFT_WR    4  // Write strobe control pin - must use a pin in the range 0-31
//#define TFT_RD    2  // Read strobe control pin

//#define TFT_D0   12  // Must use pins in the range 0-31 for the data bus
//#define TFT_D1   13  // so a single register write sets/clears all bits.
//#define TFT_D2   26  // Pins can be randomly assigned, this does not affect
//#define TFT_D3   25  // TFT screen update performance.
//#define TFT_D4   17
//#define TFT_D5   16
//#define TFT_D6   27
//#define TFT_D7   14

// ######       EDIT THE PINs BELOW TO SUIT YOUR STM32 SPI TFT SETUP        ######

// The TFT can be connected to SPI port 1 or 2
//#define TFT_SPI_PORT 1 // SPI port 1 maximum clock rate is 55MHz
//#define TFT_MOSI PA7
//#define TFT_MISO PA6
//#define TFT_SCLK PA5

//#define TFT_SPI_PORT 2 // SPI port 2 maximum clock rate is 27MHz
//#define TFT_MOSI PB15
//#define TFT_MISO PB14
//#define TFT_SCLK PB13

// Can use Ardiuno pin references, arbitrary allocation, TFT_eSPI controls chip select
//#define TFT_CS   D5 // Chip select control pin to TFT CS
//#define TFT_DC   D6 // Data Command control pin to TFT DC (may be labelled RS = Register Select)
//#define TFT_RST  D7 // Reset pin to TFT RST (or RESET)
// OR alternatively, we can use STM32 port reference names PXnn
//#define TFT_CS   PE11 // Nucleo-F767ZI equivalent of D5
//#define TFT_DC   PE9  // Nucleo-F767ZI equivalent of D6
//#define TFT_RST  PF13 // Nucleo-F767ZI equivalent of D7

//#define TFT_RST  -1   // Set TFT_RST to -1 if the display RESET is connected to processor reset
                        // Use an Arduino pin for initial testing as connecting to processor reset
                        // may not work (pulse too short at power up?)

// ##################################################################################
//
// Section 3. Define the fonts that are to be used here
//
// ##################################################################################

// Comment out the #defines below with // to stop that font being loaded
// The ESP8366 and ESP32 have plenty of memory so commenting out fonts is not
// normally necessary. If all fonts are loaded the extra FLASH space required is
// about 17Kbytes. To save FLASH space only enable the fonts you need!

#define LOAD_GLCD   // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
#define LOAD_FONT2  // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
#define LOAD_FONT4  // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
#define LOAD_FONT6  // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
#define LOAD_FONT7  // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:-.
#define LOAD_FONT8  // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
//#define LOAD_FONT8N // Font 8. Alternative to Font 8 above, slightly narrower, so 3 digits fit a 160 pixel TFT
#define LOAD_GFXFF  // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts

// Comment out the #define below to stop the SPIFFS filing system and smooth font code being loaded
// this will save ~20kbytes of FLASH
#define SMOOTH_FONT


// ##################################################################################
//
// Section 4. Other options
//
// ##################################################################################

// For RP2040 processor and SPI displays, uncomment the following line to use the PIO interface.
//#define RP2040_PIO_SPI // Leave commented out to use standard RP2040 SPI port interface

// For the RP2040 processor define the SPI port channel used (default 0 if undefined)
//#define TFT_SPI_PORT 1 // Set to 0 if SPI0 pins are used, or 1 if spi1 pins used

// For the STM32 processor define the SPI port channel used (default 1 if undefined)
//#define TFT_SPI_PORT 2 // Set to 1 for SPI port 1, or 2 for SPI port 2

// Define the SPI clock frequency, this affects the graphics rendering speed. Too
// fast and the TFT driver will not keep up and display corruption appears.
// With an ILI9341 display 40MHz works OK, 80MHz sometimes fails
// With a ST7735 display more than 27MHz may not work (spurious pixels and lines)
// With an ILI9163 display 27 MHz works OK.

// #define SPI_FREQUENCY   1000000
// #define SPI_FREQUENCY   5000000
// #define SPI_FREQUENCY  10000000
// #define SPI_FREQUENCY  20000000
#define SPI_FREQUENCY  27000000
// #define SPI_FREQUENCY  40000000
// #define SPI_FREQUENCY  55000000 // STM32 SPI1 only (SPI2 maximum is 27MHz)
// #define SPI_FREQUENCY  80000000

// Optional reduced SPI frequency for reading TFT
#define SPI_READ_FREQUENCY  20000000

// The XPT2046 requires a lower SPI clock rate of 2.5MHz so we define that here:
#define SPI_TOUCH_FREQUENCY  2500000

// The ESP32 has 2 free SPI ports i.e. VSPI and HSPI, the VSPI is the default.
// If the VSPI port is in use and pins are not accessible (e.g. TTGO T-Beam)
// then uncomment the following line:
//#define USE_HSPI_PORT

// Comment out the following #define if "SPI Transactions" do not need to be
// supported. When commented out the code size will be smaller and sketches will
// run slightly faster, so leave it commented out unless you need it!

// Transaction support is needed to work with SD library but not needed with TFT_SdFat
// Transaction support is required if other SPI devices are connected.

// Transactions are automatically enabled by the library for an ESP32 (to use HAL mutex)
// so changing it here has no effect

// #define SUPPORT_TRANSACTIONS

配置完库文件之后，下面是主程序，打开你的手机热点，并使用电脑连接热点，填好WFI密码和名称连接电脑烧录即可

#include 
#include 
#include 
#include 
#include 

uint16_t  PROGMEM dmaBuffer1[32*32]; // Toggle buffer for 32*32 MCU block, 1024bytes
uint16_t  PROGMEM dmaBuffer2[32*32]; // Toggle buffer for 32*32 MCU block, 1024bytes
uint16_t* dmaBufferPtr = dmaBuffer1;
bool dmaBufferSel = 0;

TFT_eSPI tft = TFT_eSPI(); 
TFT_eSprite clk = TFT_eSprite(&tft);
char* ssid     = ""; //填写你的wifi名字
char* password = ""; //填写你的wifi密码
int httpPort = 8081; //设置监听端口
WiFiServer server; //初始化一个服务端对象
uint8_t buff[7000] PROGMEM= {0};//每一帧的临时缓存
uint8_t img_buff[50000] PROGMEM= {0};//用于存储tcp传过来的图片
uint16_t size_count=0;//计算一帧的字节大小

bool tft_output(int16_t x, int16_t y, uint16_t w, uint16_t h, uint16_t* bitmap)
{
  if ( y >= tft.height() ) return 0;
 
  // Double buffering is used, the bitmap is copied to the buffer by pushImageDMA() the
  // bitmap can then be updated by the jpeg decoder while DMA is in progress
  if (dmaBufferSel) dmaBufferPtr = dmaBuffer2;
  else dmaBufferPtr = dmaBuffer1;
  dmaBufferSel = !dmaBufferSel; // Toggle buffer selection
  //  pushImageDMA() will clip the image block at screen boundaries before initiating DMA
  tft.pushImageDMA(x, y, w, h, bitmap, dmaBufferPtr); // Initiate DMA - blocking only if last DMA is not complete
  return 1;
}

byte loadNum = 6;
void loading(byte delayTime){//启动动画
  clk.setColorDepth(8);
  
  clk.createSprite(200, 50);
  clk.fillSprite(0x0000);

  clk.drawRoundRect(0,0,200,16,8,0xFFFF);
  clk.fillRoundRect(3,3,loadNum,10,5,0xFFFF);
  clk.setTextDatum(CC_DATUM);
  clk.setTextColor(TFT_GREEN, 0x0000); 
  clk.drawString("Connecting to WiFi",100,40,2);
  clk.pushSprite(20,67);//20 110
  clk.deleteSprite();
  loadNum += 1;
  if(loadNum>=195){
    loadNum = 195;
  }
  delay(delayTime);
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  tft.begin();
  tft.initDMA();
  tft.setRotation(0);//横屏
  tft.fillScreen(TFT_BLACK);//黑色
  tft.setTextColor(TFT_BLACK,TFT_WHITE);
  
  WiFi.begin(ssid, password); //连接wifi
  delay(1000); //等待1秒
  while (WiFi.status() != WL_CONNECTED) {
    for(byte n=0;n<10;n++){ //每500毫秒检测一次状态
      loading(50);
    }
  }
   while(loadNum < 195){ //让动画走完
    loading(3);
  }
  if (WiFi.status() == WL_CONNECTED) //判断如果wifi连接成功
  { 
    
    //client.setNoDelay(false);//关闭Nagle算法
    Serial.println("wifi is connected!");
    Serial.print("SSID: ");
    Serial.println(WiFi.SSID());
    IPAddress ip = WiFi.localIP();
    Serial.print("IP Address: ");
    Serial.println(ip);
    Serial.println("Port: "+String(httpPort));
    //tft.setSwapBytes(true);
    tft.setRotation(1);
    tft.fillScreen(TFT_BLACK);//黑色
    tft.setTextColor(TFT_BLACK,TFT_WHITE);
    tft.drawString("Wifi Have Connected To "+String(WiFi.SSID()),20,20,2);

    tft.drawString("IP: "+ip.toString(),20,40,2);
    tft.drawString("Port: "+String(httpPort),20,60,2);
    Serial.println("Waiting a client to connect.........");
    server.begin(httpPort); //服务器启动监听端口号
    server.setNoDelay(true);
  }
    TJpgDec.setJpgScale(1);
    TJpgDec.setSwapBytes(true);
    TJpgDec.setCallback(tft_output);//解码成功回调函数
}
uint16_t read_count=0;//读取buff的长度
uint8_t pack_size[2];//用来装包大小字节
uint16_t frame_size;//当前帧大小
float start_time,end_time;//帧处理开始和结束时间
float receive_time,deal_time;//帧接收和解码时间

void loop() {
  // put your main code here, to run repeatedly:
  //沾包问题 recv阻塞，长时间收不到数据就会断开
  //断开连接原因，读取buff太快，上位机发送太快造成buff溢出，清空缓冲区会断开（FLUSH）
  WiFiClient client = server.available(); //尝试建立客户对象
  if(client){
    Serial.println("[New Client!]");
    client.write("ok");//向上位机发送下一帧发送指令
    
    while(client.connected())//如果客户端处于连接状态client.connected()
    {
      client.write("no");//向上位机发送当前帧未写入完指令
      while(client.available()){
        while (client.available()) {//检测缓冲区是否有数据
             if(read_count==0)
              {
                start_time=millis();
                client.read(pack_size,2);//读取帧大小
                frame_size=pack_size[0]+(pack_size[1]<<8);
             }
             read_count=client.read(buff,7000);//向缓冲区读取数据
             memcpy(&img_buff[size_count],buff,read_count);//将读取的buff字节地址复制给img_buff数组
             size_count=size_count+read_count;//计数当前帧字节位置
  //           Serial.println(size_count);
             if(img_buff[frame_size-3]==0xaa && img_buff[frame_size-2]==0xbb && img_buff[frame_size-1]==0xcc)//判断末尾数据是否当前帧校验位
             {
              receive_time=millis()-start_time;
              deal_time=millis();
              img_buff[frame_size-3]=0;img_buff[frame_size-2]=0;img_buff[frame_size-1]=0;//清除标志位
              tft.startWrite();//必须先使用startWrite，以便TFT芯片选择保持低的DMA和SPI通道设置保持配置
              TJpgDec.drawJpg(0,0,img_buff, sizeof(img_buff));//在左上角的0,0处绘制图像——在这个草图中，DMA请求在回调tft_output()中处理
              tft.endWrite();//必须使用endWrite来释放TFT芯片选择和释放SPI通道吗
  //            memset(&img_buff,0,sizeof(img_buff));//清空buff
              size_count=0;//下一帧
              read_count=0;
              client.write("ok");//向上位机发送下一帧发送指令
              end_time = millis(); //计算mcu刷新一张图片的时间，从而算出1s能刷新多少张图，即得出最大刷新率
              Serial.printf("帧大小：%d " ,frame_size);Serial.print("MCU处理速度："); Serial.print(1000 / (end_time - start_time), 2); Serial.print("Fps");
              Serial.printf("帧接收耗时:%.2fms,帧解码显示耗时:%.2fms\n",receive_time,(millis()-deal_time));
              break;
              }       
        }
      }
    }
    client.stop();
    Serial.println("连接中断,请复位重新创建服务端");
  }
}

复位ESP32，然后你会观察到如下画面表示连接成功

打开电脑上的上位机软件，地址，填写配置IP和端口号，这两个需要和屏幕上显示的内容相同

选择投屏区域、尺寸和质量，同步还是异步（会对传输速度产生影响）点击开启投屏后按下ESP32的复位键，屏幕上就会出现投屏的画面。

五、关于Arduino

如果你对Arduino不太了解，这里强烈推荐你去看一下太极创客的教程，这是目前为止我看到的最良心的Arduino教程，同时，我也看到有很多人对使用Arduino IDE的编译环境有偏见，觉得代码封装层次太高，配置简单学不到东西，其实大可不必这样，在单片机中创意和想法是大于技术的，如果你是电子类专业，学习Arduino可以作为继续学习51系类单片机，stm32等ARM架构单片机甚至是树莓派等平台的入门。如果你是非电类专业，Arduino可以帮你了解到单片机的开发乐趣。不要忘了，Arduino有着全世界最大的开源社区，连稚晖君的HoloCubic 都是使用和Arduino相似的PIO开发的。
最后不要忘了点赞关注，有问题可以发到评论区交流。