代码收藏家 ESP32 TFT屏幕：无线投屏到你的局域网
文章目录
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。
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 <TFT_eSPI.h>
#include <SPI.h>
#include <WiFi.h>
#include <TJpg_Decoder.h>
#include <pgmspace.h>
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。
