136 lines
3.4 KiB
Arduino
136 lines
3.4 KiB
Arduino
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// Diagnostic test for the displayed colour order
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//
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// Written by Bodmer 17/2/19 for the TFT_eSPI library:
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// https://github.com/Bodmer/TFT_eSPI
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/*
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Different hardware manufacturers use different colour order
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configurations at the hardware level. This may result in
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incorrect colours being displayed.
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Incorrectly displayed colours could also be the result of
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using the wrong display driver in the library setup file.
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Typically displays have a control register (MADCTL) that can
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be used to set the Red Green Blue (RGB) colour order to RGB
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or BRG so that red and blue are swapped on the display.
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This control register is also used to manage the display
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rotation and coordinate mirroring. The control register
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typically has 8 bits, for the ILI9341 these are:
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Bit Function
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7 Mirror Y coordinate (row address order)
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6 Mirror X coordinate (column address order)
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5 Row/column exchange (for rotation)
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4 Refresh direction (top to bottom or bottom to top in portrait orientation)
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3 RGB order (swaps red and blue)
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2 Refresh direction (top to bottom or bottom to top in landscape orientation)
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1 Not used
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0 Not used
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The control register bits can be written with this example command sequence:
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tft.writecommand(TFT_MADCTL);
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tft.writedata(0x48); // Bits 6 and 3 set
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0x48 is the default value for ILI9341 (0xA8 for ESP32 M5STACK)
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in rotation 0 orientation.
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Another control register can be used to "invert" colours,
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this swaps black and white as well as other colours (e.g.
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green to magenta, red to cyan, blue to yellow).
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To invert colours insert this line after tft.init() or tft.begin():
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tft.invertDisplay( invert ); // Where invert is true or false
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*/
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#include <SPI.h>
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#include <TFT_eSPI.h> // Hardware-specific library
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
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void setup(void) {
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tft.init();
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tft.fillScreen(TFT_BLACK);
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tft.drawRect(0, 0, tft.width(), tft.height(), TFT_GREEN);
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// Set "cursor" at top left corner of display (0,0) and select font 4
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tft.setCursor(0, 4, 4);
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// Set the font colour to be white with a black background
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tft.setTextColor(TFT_WHITE);
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// We can now plot text on screen using the "print" class
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tft.println(" Initialised default\n");
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tft.println(" White text");
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tft.setTextColor(TFT_RED);
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tft.println(" Red text");
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tft.setTextColor(TFT_GREEN);
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tft.println(" Green text");
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tft.setTextColor(TFT_BLUE);
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tft.println(" Blue text");
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delay(5000);
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}
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void loop() {
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tft.invertDisplay( false ); // Where i is true or false
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tft.fillScreen(TFT_BLACK);
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tft.drawRect(0, 0, tft.width(), tft.height(), TFT_GREEN);
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tft.setCursor(0, 4, 4);
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tft.setTextColor(TFT_WHITE);
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tft.println(" Invert OFF\n");
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tft.println(" White text");
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tft.setTextColor(TFT_RED);
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tft.println(" Red text");
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tft.setTextColor(TFT_GREEN);
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tft.println(" Green text");
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tft.setTextColor(TFT_BLUE);
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tft.println(" Blue text");
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delay(5000);
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// Binary inversion of colours
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tft.invertDisplay( true ); // Where i is true or false
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tft.fillScreen(TFT_BLACK);
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tft.drawRect(0, 0, tft.width(), tft.height(), TFT_GREEN);
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tft.setCursor(0, 4, 4);
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tft.setTextColor(TFT_WHITE);
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tft.println(" Invert ON\n");
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tft.println(" White text");
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tft.setTextColor(TFT_RED);
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tft.println(" Red text");
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tft.setTextColor(TFT_GREEN);
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tft.println(" Green text");
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tft.setTextColor(TFT_BLUE);
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tft.println(" Blue text");
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delay(5000);
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}
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