This is a critical piece of – aligning endianness through register-aware data handling. Part 4: Common Register Mismatch Problems and Fixes | Symptom in Display | Root Cause | Register Fix | |-------------------|------------|---------------| | Colors inverted (red ↔ blue) | Image2LCD exported RGB, but LCD expects BGR | Set BGR bit in register 0x36 | | Image mirrored horizontally | Scan mode mismatch | Toggle MX bit in 0x36 | | Image rotated 90° | Column/row swap not set | Toggle MV bit in 0x36 | | Garbage blocks, colorful noise | Pixel format mismatch (RGB565 vs RGB666) | Check register 0x3A matches Image2LCD format | | Image shifted diagonally | Address window registers ( 0x2A , 0x2B ) wrongly sized | Verify start/end columns/pages match image dimensions | Part 5: Advanced – Handling Image2LCD’s “Register Code” Export Option Newer versions of Image2LCD include a feature called “Include Register Code” or “LCD Init Data” . When enabled, the software prepends common initialization commands for popular controllers (SSD1963, ILI9325, etc.) directly into the output file.
// Write image data – handle byte ordering tft.startWrite(); for (int i = 0; i < 240*320; i++) uint16_t color = (img[i*2] << 8) tft.endWrite(); image2lcd register code work
const unsigned char image_data[] = 0xF8, 0x00, // Red in RGB565 = 0xF800 0x07, 0xE0 // Green = 0x07E0 ; But your LCD’s write routine expects 16-bit values via SPI in (low byte first). Your register code must include a byte-swap loop: This is a critical piece of – aligning