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Header file on SD-card

The header file on SD-card library saves the screen as a header file on the SD-card.

The header file is added to the source code and included in the project of the application at build-time. Once the application is built, it loads the image into the frame-buffer, ready to be displayed at run-time.

Warning

Because the file library manages windows, it requires one of the PDLS_EXT3_Advanced_Fast_Large, PDLS_EXT3_Advanced_Fast_Medium, PDLS_EXT3_Advanced_Fast_Small and PDLS_EXT3_Advanced_Fast_Touch libraries.

Configure

Ensure the screen is declared and initialised according to the configuration procedure.

#include "hV_File_Header.h"

The pre-processor statement includes the file library.

Warning

This library requires the external SD library to manage the SD-card.

Ensure the external SD library is installed and properly configured.

File_Header myFile(&myScreen);

The constructor File_Header() sets the link to the screen.

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bool result = myFile.beginFileSystem(pinCS,
    portSPI,
    pinDetect,
    pinLevel);

if (result == false)
{
    hV_HAL_Debug_println("=== SD-card error");
}

beginFileSystem() checks an SD-card is available and initialises it.

The required parameter is

  • The first line sets the pin for selecting the SD-card.

The optional parameters are

  • The second line sets the number of the SPI port, 0 by default;

  • The third line sets the pin for the detect signal, NOT_CONNECTED or -1 par default;

  • The fourth line sets the level of detect signal, LOW by default.

beginFileSystem() returns TRUE is successful.

Use

Generate

myFile.saveScreenHeader("MyHeader");

saveScreenHeader() saves the screen on the SD-card as a header file.

The required parameter is

  • The first line provides the name of the file without the .h extension.
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myFile.saveWindowHeader("MyHeader",
    40, 71, 100, 50) // x y dx dy

saveWindowHeader() save a window on a header file on the SD-card as a header file.

The required parameters are

  • The first line provides the name of the file without the .h extension.

  • The second line defines the window with vector coordinates.

The coordinates are rounded as multiple of 8.

For example, the vector coordinates (70, 44, 155, 64) are changed to (70, 40, 155, 72).

The resulting header file is named MyHeader.h and contains the structure Image_MyHeader.

myFile.endFileSystem();

endFileSystem() closes the SD-card.

Display

#include "MyHeader.h"

myFile.readWindowHeader(Image_MyHeader);
myScreen.fastFlush();

The application needs to include the header file previously generated.

readWindowHeader() loads the image into the frame-buffer, ready to be displayed.

Example

This is the core of the code from example File_Header.ino.

First, generate the header file.

void displayWriteHeader()
{
    // SD-card initialisation
    bool result = myFile.beginFileSystem(cardCS);
    if (result == false)
    {
        hV_HAL_Debug_println("=== SD-card error");
        return;
    }

    myScreen.setOrientation(myOrientation);
    myScreen.selectFont(fontLarge);

    myScreen.clear();
    myScreen.gText(4, 4, "Image to be saved");
    myScreen.flush();

    char * text = "Hello!";
    myScreen.selectFont(fontExtra);

    uint16_t x, y, dx, dy;
    x = myScreen.screenSizeX();
    y = myScreen.screenSizeY();
    dx = myScreen.stringSizeX(text);
    dy = myScreen.characterSizeY();
    x = (x - dx) / 2;
    y = (y - dy) / 2;

    myScreen.setFontSolid();
    myScreen.gText(x, y, text, myColours.white, myColours.black);

    myScreen.flushFast();

    // Write to SD-card
    myFile.saveWindowHeader("myHeader", x, y, dx, dy);
    wait(4);
}
The generated header file is

// Image as header file generated by hV_File_Header

// SDK
#include "hV_HAL_Peripherals.h"

// Release
#ifndef MYHEADER_RELEASE
#define MYHEADER_RELEASE

#include "hV_Image.h"

static const uint8_t Table_myHeader[] = 
{
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 71
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 72
   0x0f, 0xfe, 0x00, 0x00, 0x3f, 0xf8, 0x01, 0xff, 0xf0, // v= 73
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 74
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 75
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 76
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 77
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 78
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 79
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 80
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x78, 0x01, 0xff, 0xf0, // v= 81
   0x0f, 0xfe, 0x00, 0x00, 0x3f, 0xf8, 0x01, 0xff, 0xf0, // v= 82
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 83
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 84
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 85
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 86
   0x0f, 0xff, 0xff, 0xff, 0xe0, 0x07, 0xff, 0xff, 0xf0, // v= 87
   0x0f, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xf0, // v= 88
   0x0f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x7f, 0xff, 0xf0, // v= 89
   0x0f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x1f, 0xff, 0xf0, // v= 90
   0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xf0, // v= 91
   0x0f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xf0, // v= 92
   0x0f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xf0, // v= 93
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x03, 0xff, 0xf0, // v= 94
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 95
   0x0f, 0xff, 0xff, 0x80, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 96
   0x0f, 0xff, 0xff, 0x80, 0x0f, 0xf0, 0x01, 0xff, 0xf0, // v= 97
   0x0f, 0xff, 0xff, 0x80, 0x3f, 0xfc, 0x01, 0xff, 0xf0, // v= 98
   0x0f, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xf0, // v= 99
   0x0f, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xf0, // v= 100
   0x0f, 0xff, 0xff, 0x01, 0xff, 0xff, 0x80, 0xff, 0xf0, // v= 101
   0x0f, 0xff, 0xff, 0x01, 0xff, 0xff, 0x80, 0xff, 0xf0, // v= 102
   0x0f, 0xff, 0xff, 0x01, 0xff, 0xff, 0x80, 0xff, 0xf0, // v= 103
   0x0f, 0xff, 0xff, 0x01, 0xff, 0xff, 0x80, 0xff, 0xf0, // v= 104
   0x0f, 0xff, 0xff, 0x01, 0xff, 0xff, 0x80, 0xff, 0xf0, // v= 105
   0x0f, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xf0, // v= 106
   0x0f, 0xff, 0xff, 0x00, 0xff, 0xff, 0x00, 0xff, 0xf0, // v= 107
   0x0f, 0xff, 0xff, 0x80, 0x3f, 0xfc, 0x01, 0xff, 0xf0, // v= 108
   0x0f, 0xff, 0xff, 0x80, 0x0f, 0xf0, 0x01, 0xff, 0xf0, // v= 109
   0x0f, 0xff, 0xff, 0x80, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 110
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x03, 0xff, 0xf0, // v= 111
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x03, 0xff, 0xf0, // v= 112
   0x0f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xf0, // v= 113
   0x0f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xf0, // v= 114
   0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xf0, // v= 115
   0x0f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x1f, 0xff, 0xf0, // v= 116
   0x0f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x7f, 0xff, 0xf0, // v= 117
   0x0f, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xf0, // v= 118
   0x0f, 0xff, 0xff, 0xff, 0xe0, 0x07, 0xff, 0xff, 0xf0, // v= 119
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 120
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 121
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 122
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 123
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 124
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 125
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 126
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 127
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 128
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 129
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 130
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 131
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 132
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 133
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 134
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 135
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 136
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 137
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 138
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 139
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 140
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 141
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 142
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 143
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 144
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 145
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 146
   0x0f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 147
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 148
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 149
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 150
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 151
   0x0f, 0xff, 0xff, 0xff, 0xe0, 0x3f, 0xff, 0xff, 0xf0, // v= 152
   0x0f, 0xff, 0xff, 0xff, 0x00, 0x3c, 0x07, 0xff, 0xf0, // v= 153
   0x0f, 0xff, 0xff, 0xfc, 0x00, 0x3e, 0x03, 0xff, 0xf0, // v= 154
   0x0f, 0xff, 0xff, 0xf8, 0x00, 0x3e, 0x03, 0xff, 0xf0, // v= 155
   0x0f, 0xff, 0xff, 0xf0, 0x00, 0x3f, 0x03, 0xff, 0xf0, // v= 156
   0x0f, 0xff, 0xff, 0xe0, 0x00, 0x3f, 0x01, 0xff, 0xf0, // v= 157
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x3f, 0x81, 0xff, 0xf0, // v= 158
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x3f, 0x81, 0xff, 0xf0, // v= 159
   0x0f, 0xff, 0xff, 0x80, 0x00, 0x3f, 0x81, 0xff, 0xf0, // v= 160
   0x0f, 0xff, 0xff, 0x80, 0x00, 0x3f, 0x80, 0xff, 0xf0, // v= 161
   0x0f, 0xff, 0xff, 0x80, 0x70, 0x3f, 0xc0, 0xff, 0xf0, // v= 162
   0x0f, 0xff, 0xff, 0x00, 0xf0, 0x3f, 0xc0, 0xff, 0xf0, // v= 163
   0x0f, 0xff, 0xff, 0x01, 0xf0, 0x3f, 0xc0, 0xff, 0xf0, // v= 164
   0x0f, 0xff, 0xff, 0x03, 0xf0, 0x3f, 0xc0, 0xff, 0xf0, // v= 165
   0x0f, 0xff, 0xff, 0x03, 0xf0, 0x3f, 0xc0, 0xff, 0xf0, // v= 166
   0x0f, 0xff, 0xff, 0x03, 0xf0, 0x3f, 0xc0, 0xff, 0xf0, // v= 167
   0x0f, 0xff, 0xff, 0x03, 0xf0, 0x3f, 0xc0, 0xff, 0xf0, // v= 168
   0x0f, 0xff, 0xff, 0x03, 0xf0, 0x3f, 0x80, 0xff, 0xf0, // v= 169
   0x0f, 0xff, 0xff, 0x01, 0xf0, 0x3f, 0x80, 0xff, 0xf0, // v= 170
   0x0f, 0xff, 0xff, 0x01, 0xf0, 0x3f, 0x00, 0xff, 0xf0, // v= 171
   0x0f, 0xff, 0xff, 0x80, 0xf0, 0x3e, 0x01, 0xff, 0xf0, // v= 172
   0x0f, 0xff, 0xff, 0x80, 0x30, 0x38, 0x01, 0xff, 0xf0, // v= 173
   0x0f, 0xff, 0xff, 0x80, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 174
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x03, 0xff, 0xf0, // v= 175
   0x0f, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x03, 0xff, 0xf0, // v= 176
   0x0f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xf0, // v= 177
   0x0f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0xff, 0xf0, // v= 178
   0x0f, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x0f, 0xff, 0xf0, // v= 179
   0x0f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x1f, 0xff, 0xf0, // v= 180
   0x0f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x7f, 0xff, 0xf0, // v= 181
   0x0f, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xf0, // v= 182
   0x0f, 0xff, 0xff, 0xff, 0xe0, 0x07, 0xff, 0xff, 0xf0, // v= 183
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 184
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 185
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 186
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 187
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 188
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 189
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 190
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 191
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 192
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 193
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 194
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 195
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 196
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 197
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 198
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 199
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 200
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 201
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 202
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 203
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 204
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 205
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 206
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 207
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 208
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 209
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 210
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 211
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 212
   0x0f, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xff, 0xff, 0xf0, // v= 213
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 214
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 215
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 216
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 217
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 218
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 219
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 220
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 221
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 222
   0x0f, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xf0, // v= 223
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 224
   0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, // v= 225
};

const image_s Image_myHeader =
{
  .minPartialH = 40,
  .minPartialV = 71,
  .maxPartialH = 111,
  .maxPartialV = 225,
  .depth = 2,
  .size = 1395,
  .table = Table_myHeader
};

#endif // MYHEADER_RELEASE

Then, include the header file in the application and build it.

#include "myHeader.h"

void displayReadHeader()
{
    // No SD-card initialisation required

    myScreen.setOrientation(myOrientation);
    myScreen.clear();

    myScreen.selectFont(fontLarge);
    myScreen.gText(4, 4, "Image to be read");
    myScreen.flushFast();
    wait(4);

    myFile.readScreenHeader(Image_myHeader);
    myScreen.flushFast();
    wait(4);
}
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