分类： Funny

#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiLib.h>
#include <PiDxe.h>
#include <Protocol/SimpleFileSystem.h>

extern EFI_SYSTEM_TABLE *gST;

EFI_GUID gEfiSimpleTextInputProtocolGuid = {
    0x387477c1,
    0x69c7,
    0x11d2,
    {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b}};

// EFI_FILE_PROTOCOL *Root;
EFI_SIMPLE_TEXT_INPUT_PROTOCOL *SimpleInput;
EFI_INPUT_READ_KEY OldReadKeyStroke;

// This one will replace the Read function of Read in Simple File System
EFI_STATUS
EFIAPI
MyReadKeyStroke(IN EFI_SIMPLE_TEXT_INPUT_PROTOCOL *This,
                OUT EFI_INPUT_KEY *Key) {
  //EFI_INPUT_KEY IKey;
  EFI_TPL OldTpl;
  EFI_STATUS Status;
  //
  // Enter critical section
  //
  OldTpl = gBS->RaiseTPL(TPL_NOTIFY);

  Status = (*OldReadKeyStroke)(SimpleInput, Key);
  if (Key->UnicodeChar==0x7A) {
  	 Key->UnicodeChar=0x61;
  }

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL(OldTpl);

  return Status;
}

EFI_STATUS
EFIAPI
MyEntryPoint(IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable) {
  EFI_STATUS Status;

  // Look for one Simple Simple Input Protocol
  Status =
      gBS->LocateProtocol(&gEfiSimpleTextInputProtocolGuid, NULL, &SimpleInput);
  if (EFI_ERROR(Status)) {
    gST->ConOut->OutputString(gST->ConOut,
                              L"Can't find Simple Input PROTOCOL\n");
    return Status;
  }
  OldReadKeyStroke = SimpleInput->ReadKeyStroke;  
  SimpleInput->ReadKeyStroke = MyReadKeyStroke;


  return Status;
}

  MdeModulePkg/Universal/RegularExpressionDxe/RegularExpressionDxe.inf
  MdeModulePkg/Universal/SmmCommunicationBufferDxe/SmmCommunicationBufferDxe.inf
  MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDxe.inf
  MdeModulePkg/KSTest/KSTest.inf

[Components.X64]
  MdeModulePkg/Universal/CapsulePei/CapsuleX64.inf

[BuildOptions]

build -a X64 -p MdeModulePkg\MdeModulePkg.dsc -t VS2019

load kst.efi

#include <graphics.h>  // EasyX图形库头文件
#include <conio.h>     // 用于_getch()
#include <math.h>    

#define a 100
#define b 50

int main()
{
    int x,y;
    // 初始化640x480像素的图形窗口
    initgraph(640, 480);

    for (int i = 0; i < 360; i++) {
        x = 320 + a * cos(i * 3.1415 / 180); // sin 用弧度做参数
        y=  240+ b * sin(i * 3.1415 / 180); // cos 用弧度做参数
        putpixel(x, y, RED);  
    }

    // 保持窗口显示
    _getch();

    // 关闭图形窗口
    closegraph();
    return 0;
}

#include <graphics.h>  // EasyX图形库头文件
#include <conio.h>     // 用于_getch()
#include <math.h>    
#include <stdio.h>  

#define Xcenter 320
#define Ycenter 240

// 长轴
#define A 50
// 短轴
#define B 30

// 焦点F1坐标
#define Xf1 (Xcenter-(int)(sqrt(A*A-B*B)))
#define Yf1 Ycenter
// 焦点F2坐标
#define Xf2 (Xcenter+(int)(sqrt(A*A-B*B)))
#define Yf2 Ycenter

// 计算 (x,y) 到焦点F1和F2的距离之和
double CalculateDistance(int x, int y)
{
    double f1 = sqrt((x - Xf1) * (x - Xf1) + (y - Yf1) * (y - Yf1));
    double f2 = sqrt((x - Xf2) * (x - Xf2) + (y - Yf2) * (y - Yf2));
    return (f1+f2);
}

// 找到下一个点位
// 输入当前点位坐标 (Xcurrent,Ycurrent)
// 前一个点位坐标 （Xlast,Ylast
void FindNextPoint(int Xcurrent, int Ycurrent, int Xlast, int Ylast, int *Xnext, int *Ynext)
{
    double gap= 1000000000.0;
    double tmp;
    // 左
    if ((Xcurrent - 1 != Xlast) || (Ycurrent != Ylast)) {
        tmp = fabs(CalculateDistance(Xcurrent - 1, Ycurrent) - 2 * A);
        if (gap > tmp) {
            gap = fabs(CalculateDistance(Xcurrent - 1, Ycurrent) - 2 * A);
            *Xnext = Xcurrent - 1;
            *Ynext = Ycurrent;
        }
    }
    // 左上
    if ((Xcurrent-1 != Xlast) || (Ycurrent-1!= Ylast)) {
        tmp = fabs(CalculateDistance(Xcurrent - 1, Ycurrent - 1) - 2 * A);
        if (gap > tmp) {
            gap = fabs(CalculateDistance(Xcurrent - 1, Ycurrent-1) - 2 * A);
            *Xnext = Xcurrent - 1;
            *Ynext = Ycurrent-1; 
        }
    }
    // 上
    if ((Xcurrent!= Xlast) || (Ycurrent - 1 != Ylast)) {
        tmp = fabs(CalculateDistance(Xcurrent, Ycurrent - 1) - 2 * A);
        if (gap > tmp) {
            gap = fabs(CalculateDistance(Xcurrent, Ycurrent - 1) - 2 * A);
            *Xnext = Xcurrent;
            *Ynext = Ycurrent - 1;
        }
    }
    // 右上
    if ((Xcurrent+1 != Xlast) || (Ycurrent - 1 != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent+1, Ycurrent - 1) - 2 * A)) {
            gap = fabs(CalculateDistance(Xcurrent+1, Ycurrent - 1) - 2 * A);
            *Xnext = Xcurrent+1;
            *Ynext = Ycurrent - 1;
        }
    }
    // 右
    if ((Xcurrent + 1 != Xlast) || (Ycurrent != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent + 1, Ycurrent) - 2 * A)) {
            gap = fabs(CalculateDistance(Xcurrent + 1, Ycurrent) - 2 * A);
            *Xnext = Xcurrent + 1;
            *Ynext = Ycurrent;
        }
    }
    // 右下
    if ((Xcurrent + 1 != Xlast) || (Ycurrent+1 != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent + 1, Ycurrent+1) - 2 * A)) {
            gap = fabs(CalculateDistance(Xcurrent + 1, Ycurrent+1) - 2 * A);
            *Xnext = Xcurrent + 1;
            *Ynext = Ycurrent + 1;
        }
    }
    // 下
    if ((Xcurrent != Xlast) || (Ycurrent +1!= Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent, Ycurrent+1) - 2 * A)) {
            gap = fabs(CalculateDistance(Xcurrent, Ycurrent+1) - 2 * A);
            *Xnext = Xcurrent;
            *Ynext = Ycurrent+1;
        }
    }
    // 左下
    if ((Xcurrent-1 != Xlast) || (Ycurrent + 1 != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent-1, Ycurrent + 1) - 2 * A)) {
            gap = fabs(CalculateDistance(Xcurrent-1, Ycurrent + 1) - 2 * A);
            *Xnext = Xcurrent-1;
            *Ynext = Ycurrent + 1;
        }
    }

}
int main()
{
    int x=0, y= 0;
    int Xlast = Xcenter - A, Ylast = Ycenter;
    int Xcurrent = Xcenter - A, Ycurrent = Ycenter;

    // 初始化640x480像素的图形窗口
    initgraph(640, 480);

    for (int i = 0; i < 255; i++) {
        FindNextPoint(Xcurrent, Ycurrent,Xlast,Ylast,&x,&y);

        //printf("%d %d\n", x- Xcenter, y-Ycenter);
        putpixel(Xcurrent, Ycurrent, RED);
        Xlast = Xcurrent;
        Ylast = Ycurrent;
        Xcurrent = x;
        Ycurrent = y;

        if ((i != 0) && (Xcurrent == Xcenter - A) && (Ycurrent == Ycenter)) {
            printf("-->%d \n",i);
        }

    }

    // 保持窗口显示
    _getch();

    // 关闭图形窗口
    closegraph();
    return 0;
}

#include <graphics.h>  // EasyX图形库头文件
#include <conio.h>     // 用于_getch()
#include <math.h>    

#define RAD 100
int main()
{
    int x,y;
    // 初始化640x480像素的图形窗口
    initgraph(640, 480);

    for (int i = 0; i < 360; i++) {
        x = 320 + RAD * sin(i * 3.1415 / 180); // sin 用弧度做参数
        y=  240+ RAD * cos(i * 3.1415 / 180); // cos 用弧度做参数
        putpixel(x, y, RED);  
    }

    // 保持窗口显示
    _getch();

    // 关闭图形窗口
    closegraph();
    return 0;
}

#include <graphics.h>  // EasyX图形库头文件
#include <conio.h>     // 用于_getch()
#include <math.h>    
//#include <stdio.h>  

#define Xcenter 320
#define Ycenter 240
#define RAD 100

// 计算 (x,y) 到圆心的距离
double CalculateDistance(int x, int y)
{
    return (sqrt((x - Xcenter) * (x - Xcenter) + (y - Ycenter) * (y - Ycenter)));
}

// 找到下一个点位
// 输入当前点位坐标 (Xcurrent,Ycurrent)
// 前一个点位坐标 （Xlast,Ylast
void FindNextPoint(int Xcurrent, int Ycurrent, int Xlast, int Ylast, int *Xnext, int *Ynext)
{
    double gap= 1000000000.0;
    double tmp;

    // 左
    if ((Xcurrent - 1 != Xlast) || (Ycurrent != Ylast)) {
        tmp = CalculateDistance(Xcurrent - 1, Ycurrent);
        tmp = fabs(tmp - RAD);
        if (gap > tmp) {
            gap = fabs(CalculateDistance(Xcurrent - 1, Ycurrent) - RAD);
            *Xnext = Xcurrent - 1;
            *Ynext = Ycurrent;
        }
    }
    // 左上
    if ((Xcurrent-1 != Xlast) || (Ycurrent-1!= Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent - 1, Ycurrent-1) - RAD)) {
            gap = fabs(CalculateDistance(Xcurrent - 1, Ycurrent-1) - RAD);
            *Xnext = Xcurrent - 1;
            *Ynext = Ycurrent-1; 
        }
    }
    // 上
    if ((Xcurrent!= Xlast) || (Ycurrent - 1 != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent, Ycurrent - 1) - RAD)) {
            gap = fabs(CalculateDistance(Xcurrent, Ycurrent - 1) - RAD);
            *Xnext = Xcurrent;
            *Ynext = Ycurrent - 1;
        }
    }
    // 右上
    if ((Xcurrent+1 != Xlast) || (Ycurrent - 1 != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent+1, Ycurrent - 1) - RAD)) {
            gap = fabs(CalculateDistance(Xcurrent+1, Ycurrent - 1) - RAD);
            *Xnext = Xcurrent+1;
            *Ynext = Ycurrent - 1;
        }
    }
    // 右
    if ((Xcurrent + 1 != Xlast) || (Ycurrent != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent + 1, Ycurrent) - RAD)) {
            gap = fabs(CalculateDistance(Xcurrent + 1, Ycurrent) - RAD);
            *Xnext = Xcurrent + 1;
            *Ynext = Ycurrent;
        }
    }
    // 右下
    if ((Xcurrent + 1 != Xlast) || (Ycurrent+1 != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent + 1, Ycurrent+1) - RAD)) {
            gap = fabs(CalculateDistance(Xcurrent + 1, Ycurrent+1) - RAD);
            *Xnext = Xcurrent + 1;
            *Ynext = Ycurrent + 1;
        }
    }
    // 下
    if ((Xcurrent != Xlast) || (Ycurrent +1!= Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent, Ycurrent+1) - RAD)) {
            gap = fabs(CalculateDistance(Xcurrent, Ycurrent+1) - RAD);
            *Xnext = Xcurrent;
            *Ynext = Ycurrent+1;
        }
    }
    // 左下
    if ((Xcurrent-1 != Xlast) || (Ycurrent + 1 != Ylast)) {
        if (gap > fabs(CalculateDistance(Xcurrent-1, Ycurrent + 1) - RAD)) {
            gap = fabs(CalculateDistance(Xcurrent-1, Ycurrent + 1) - RAD);
            *Xnext = Xcurrent-1;
            *Ynext = Ycurrent + 1;
        }
    }

}
int main()
{
    int x=0, y= 0;
    int Xlast = Xcenter - RAD, Ylast = Ycenter;
    int Xcurrent = Xcenter - RAD, Ycurrent = Ycenter;

    // 初始化640x480像素的图形窗口
    initgraph(640, 480);


    for (int i = 0; i < 800; i++) {
        FindNextPoint(Xcurrent, Ycurrent,Xlast,Ylast,&x,&y);

        //printf("%d %d\n", x, y);
        putpixel(Xcurrent, Ycurrent, RED);
        Xlast = Xcurrent;
        Ylast = Ycurrent;
        Xcurrent = x;
        Ycurrent = y;
    }

    // 保持窗口显示
    _getch();

    // 关闭图形窗口
    closegraph();
    return 0;
}

#include <WiFi.h>
#include <WebServer.h>
#include <driver/i2s.h>

// WiFi配置
const char* ssid = "YOURSSID";
const char* password = "YOURPASSWORD";

// I2S配置
#define I2S_MIC_WS  37
#define I2S_MIC_SD  48
#define I2S_MIC_SCK 45
#define SAMPLE_RATE 16000
#define BITS_PER_SAMPLE 32
#define BUFFER_SIZE 1024

WebServer server(80);
int32_t audioBuffer[BUFFER_SIZE];

void setup() {
  Serial.begin(2000000);
  
  // 初始化I2S
  i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
    .dma_buf_count = 8,
    .dma_buf_len = BUFFER_SIZE,
    .use_apll = false
  };
  
  i2s_pin_config_t pin_config = {
    .bck_io_num = I2S_MIC_SCK,
    .ws_io_num = I2S_MIC_WS,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_MIC_SD
  };
  
  i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
  i2s_set_pin(I2S_NUM_0, &pin_config);

  // 连接WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
  Serial.println("IP address: " + WiFi.localIP().toString());

  // 设置HTTP路由
  server.on("/stream", HTTP_GET, handleAudioStream);
  server.begin();
}

void loop() {
  server.handleClient();
  
  // 持续读取音频数据
  size_t bytesRead;
  i2s_read(I2S_NUM_0, &audioBuffer, BUFFER_SIZE * sizeof(int32_t), &bytesRead, portMAX_DELAY);
}

void handleAudioStream() {
  // 生成WAV文件头
  uint8_t wavHeader[44];
  generateWavHeader(wavHeader, SAMPLE_RATE, 32);
  
  // 发送HTTP头
  server.setContentLength(CONTENT_LENGTH_UNKNOWN);
  server.send(200, "audio/wav", "");
  
  // 先发送WAV头
  server.sendContent((const char*)wavHeader, sizeof(wavHeader));
  
  // 持续发送音频数据
  while(server.client().connected()) {
    size_t bytesRead;
    i2s_read(I2S_NUM_0, &audioBuffer, BUFFER_SIZE*4, &bytesRead, portMAX_DELAY);
    server.sendContent((const char*)audioBuffer, bytesRead);
  }
}


void generateWavHeader(uint8_t* header, uint32_t sampleRate, uint32_t bitDepth) {
    // RIFF块标识
    header[0] = 'R'; header[1] = 'I'; header[2] = 'F'; header[3] = 'F';
    
    // 文件总大小占位（后续更新）
    header[4] = 0; header[5] = 0; header[6] = 0; header[7] = 0;
    
    // WAVE格式标识
    header[8] = 'W'; header[9] = 'A'; header[10] = 'V'; header[11] = 'E';
    
    // fmt子块标识
    header[12] = 'f'; header[13] = 'm'; header[14] = 't'; header[15] = ' ';
    
    // fmt块大小（16字节）
    header[16] = 16; header[17] = 0; header[18] = 0; header[19] = 0;
    
    // 音频格式（1=PCM）
    header[20] = 1; header[21] = 0;
    
    // 声道数（1=单声道）
    header[22] = 1; header[23] = 0;
    
    // 采样率
    header[24] = sampleRate & 0xFF;
    header[25] = (sampleRate >> 8) & 0xFF;
    header[26] = (sampleRate >> 16) & 0xFF;
    header[27] = (sampleRate >> 24) & 0xFF;
    
    // 字节率 = 采样率 * 声道数 * 位深度/8
    uint32_t byteRate = sampleRate * (bitDepth/8);
    header[28] = byteRate & 0xFF;
    header[29] = (byteRate >> 8) & 0xFF;
    header[30] = (byteRate >> 16) & 0xFF;
    header[31] = (byteRate >> 24) & 0xFF;
    
    // 块对齐 = 声道数 * 位深度/8
    uint16_t blockAlign = (bitDepth/8);
    header[32] = blockAlign & 0xFF;
    header[33] = (blockAlign >> 8) & 0xFF;
    
    // 位深度
    header[34] = bitDepth & 0xFF;
    header[35] = (bitDepth >> 8) & 0xFF;
    
    // data子块标识
    header[36] = 'd'; header[37] = 'a'; header[38] = 't'; header[39] = 'a';
    
    // data块大小占位（后续更新）
    header[40] = 0; header[41] = 0; header[42] = 0; header[43] = 0;
}

#include <WiFi.h>
#include <WebServer.h>
#include <driver/i2s.h>

// WiFi配置
const char* ssid = "CMCC-TSR6739";
const char* password = "!!1783az";

// I2S配置
#define I2S_MIC_WS  37
#define I2S_MIC_SD  48
#define I2S_MIC_SCK 45
#define SAMPLE_RATE 16000
#define BITS_PER_SAMPLE 32
#define BUFFER_SIZE 1024

WebServer server(80);
int32_t audioBuffer[BUFFER_SIZE];
int16_t webaudioBuffer[BUFFER_SIZE];

void setup() {
  Serial.begin(2000000);
  
  // 初始化I2S
  i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
    .dma_buf_count = 8,
    .dma_buf_len = BUFFER_SIZE,
    .use_apll = false
  };
  
  i2s_pin_config_t pin_config = {
    .bck_io_num = I2S_MIC_SCK,
    .ws_io_num = I2S_MIC_WS,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_MIC_SD
  };
  
  i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
  i2s_set_pin(I2S_NUM_0, &pin_config);

  // 连接WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
  Serial.println("IP address: " + WiFi.localIP().toString());

  // 设置HTTP路由
  server.on("/stream", HTTP_GET, handleAudioStream);
  server.begin();
}

void loop() {
  server.handleClient();
  
  // 持续读取音频数据
  size_t bytesRead;
  i2s_read(I2S_NUM_0, &audioBuffer, BUFFER_SIZE * sizeof(int32_t), &bytesRead, portMAX_DELAY);
}

void handleAudioStream() {
  // 生成WAV文件头
  uint8_t wavHeader[44];
  generateWavHeader(wavHeader, SAMPLE_RATE, 16);
  
  // 发送HTTP头
  server.setContentLength(CONTENT_LENGTH_UNKNOWN);
  server.send(200, "audio/wav", "");
  
  // 先发送WAV头
  server.sendContent((const char*)wavHeader, sizeof(wavHeader));
  
  // 持续发送音频数据
  while(server.client().connected()) {
    size_t bytesRead;
    i2s_read(I2S_NUM_0, &audioBuffer, BUFFER_SIZE*4, &bytesRead, portMAX_DELAY);
    for (int i=0;i<BUFFER_SIZE;i++) {
       int32_t audio_24bit = audioBuffer[i] >> 8;       // 提取高 24 位
       webaudioBuffer[i]=(int16_t)((audio_24bit + 128) >> 8);            // 四舍五入到 16 位
  
    }
    server.sendContent((const char*)webaudioBuffer, bytesRead/2);
  }
}


void generateWavHeader(uint8_t* header, uint32_t sampleRate, uint32_t bitDepth) {
    // RIFF块标识
    header[0] = 'R'; header[1] = 'I'; header[2] = 'F'; header[3] = 'F';
    
    // 文件总大小占位（后续更新）
    header[4] = 0; header[5] = 0; header[6] = 0; header[7] = 0;
    
    // WAVE格式标识
    header[8] = 'W'; header[9] = 'A'; header[10] = 'V'; header[11] = 'E';
    
    // fmt子块标识
    header[12] = 'f'; header[13] = 'm'; header[14] = 't'; header[15] = ' ';
    
    // fmt块大小（16字节）
    header[16] = 16; header[17] = 0; header[18] = 0; header[19] = 0;
    
    // 音频格式（1=PCM）
    header[20] = 1; header[21] = 0;
    
    // 声道数（1=单声道）
    header[22] = 1; header[23] = 0;
    
    // 采样率
    header[24] = sampleRate & 0xFF;
    header[25] = (sampleRate >> 8) & 0xFF;
    header[26] = (sampleRate >> 16) & 0xFF;
    header[27] = (sampleRate >> 24) & 0xFF;
    
    // 字节率 = 采样率 * 声道数 * 位深度/8
    uint32_t byteRate = sampleRate * (bitDepth/8);
    header[28] = byteRate & 0xFF;
    header[29] = (byteRate >> 8) & 0xFF;
    header[30] = (byteRate >> 16) & 0xFF;
    header[31] = (byteRate >> 24) & 0xFF;
    
    // 块对齐 = 声道数 * 位深度/8
    uint16_t blockAlign = (bitDepth/8);
    header[32] = blockAlign & 0xFF;
    header[33] = (blockAlign >> 8) & 0xFF;
    
    // 位深度
    header[34] = bitDepth & 0xFF;
    header[35] = (bitDepth >> 8) & 0xFF;
    
    // data子块标识
    header[36] = 'd'; header[37] = 'a'; header[38] = 't'; header[39] = 'a';
    
    // data块大小占位（后续更新）
    header[40] = 0; header[41] = 0; header[42] = 0; header[43] = 0;
}

#include <graphics.h>  // EasyX图形库头文件
#include <conio.h>     // 用于_getch()
#include <math.h>    

#define a 0 // 从原点开始
#define b 60*3.1415/180 //半径增加的速率

int main()
{
    int x,y;
    // 初始化640x480像素的图形窗口
    initgraph(640, 480);

    for (int i = 0; i < 360*30; i++) {
        x = 320 + (a+  b * (i * 3.1415 / 180)) * cos(i * 3.1415 / 180);
        y=  240+  (a + b * (i * 3.1415 / 180)) * sin(i * 3.1415 / 180);
        putpixel(x, y, YELLOW);  
    }

    // 保持窗口显示
    _getch();

    // 关闭图形窗口
    closegraph();
    return 0;
}

#define CH_IN 14
#define LED   15
#define CTRL1 16
#define KEY   17
void setup() {
  pinMode(CH_IN,OUTPUT);
  pinMode(LED,OUTPUT);
  pinMode(CTRL1,OUTPUT);
  pinMode(KEY,INPUT_PULLUP);
    
  digitalWrite(CH_IN,LOW); // Switch to 1
  digitalWrite(LED,LOW); // 不亮
  digitalWrite(CTRL1,HIGH); // 供电    
}
unsigned long int Elsp=0;

void loop() {
  if (digitalRead(KEY)==LOW) {
      digitalWrite(LED,HIGH); // 点亮 LED
      digitalWrite(CH_IN,HIGH); // 断开数据线
      delay(100);
      digitalWrite(CTRL1,LOW); // 断开USB供电
      Elsp=millis();
  } else {
      // Key 抬起
      if ((Elsp!=0)&&(millis()-Elsp>500)) {
          Elsp=0;
          digitalWrite(LED,LOW); // 关闭 LED          
          digitalWrite(CTRL1,HIGH); // 开始USB供电
          delay(100);
          digitalWrite(CH_IN,LOW); // 接通数据线
        }
    }
}

        // 读取文件
        image.read(filename);

        // 改变大小
        image.resize(Geometry(image.columns() * resize/100, image.rows() *resize / 100));
        // 设置背景颜色用于填充
        image.backgroundColor(Color("Yellow"));
        //旋转
        image.rotate(angle);
        // 特别主意，如果没有下面这个 repage 会导致计算坐标有问题
        image.repage();
        //以中心为原点裁剪图片
        image.crop(Geometry(1920, 1080, (image.columns()/2 - 1920/2), (image.rows()/2 - 1080/2)));

        // 保存图片
        image.write(Output);

bflat build --os:uefi --stdlib:zero -o:bootx64.efi