94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
// A fun MATRIX-like screen demo of scrolling
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// Screen will flicker initially until fully drawn
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// then scroll smoothly
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// Needs GLCD font
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/*
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Make sure all the display driver and pin comnenctions are correct by
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editting the User_Setup.h file in the TFT_eSPI library folder.
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#########################################################################
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###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
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#########################################################################
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*/
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#include <TFT_eSPI.h> // Hardware-specific library
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#include <SPI.h>
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
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#define TEXT_HEIGHT 8 // Height of text to be printed and scrolled
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#define BOT_FIXED_AREA 0 // Number of lines in bottom fixed area (lines counted from bottom of screen)
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#define TOP_FIXED_AREA 0 // Number of lines in top fixed area (lines counted from top of screen)
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uint16_t yStart = TOP_FIXED_AREA;
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uint16_t yArea = 320 - TOP_FIXED_AREA - BOT_FIXED_AREA;
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uint16_t yDraw = 320 - BOT_FIXED_AREA - TEXT_HEIGHT;
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byte pos[42];
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uint16_t xPos = 0;
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void setup() {
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Serial.begin(115200);
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randomSeed(analogRead(A0));
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tft.init();
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tft.setRotation(0);
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tft.fillScreen(ILI9341_BLACK);
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setupScrollArea(TOP_FIXED_AREA, BOT_FIXED_AREA);
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}
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void loop(void) {
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// First fill the screen with random streaks of characters
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for (int j = 0; j < 600; j += TEXT_HEIGHT) {
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for (int i = 0; i < 40; i++) {
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if (pos[i] > 20) pos[i] -= 3; // Rapid fade initially brightness values
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if (pos[i] > 0) pos[i] -= 1; // Slow fade later
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if ((random(20) == 1) && (j<400)) pos[i] = 63; // ~1 in 20 probability of a new character
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tft.setTextColor(pos[i] << 5, ILI9341_BLACK); // Set the green character brightness
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if (pos[i] == 63) tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK); // Draw white character
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xPos += tft.drawChar(random(32, 128), xPos, yDraw, 1); // Draw the character
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}
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yDraw = scroll_slow(TEXT_HEIGHT, 14); // Scroll, 14ms per pixel line
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xPos = 0;
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}
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//tft.setRotation(2);
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//tft.setTextColor(63 << 5, ILI9341_BLACK);
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//tft.drawCentreString("MATRIX",120,60,4);
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//tft.setRotation(0);
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// Now scroll smoothly forever
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while (1) {yield(); yDraw = scroll_slow(320,5); }// Scroll 320 lines, 5ms per line
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}
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void setupScrollArea(uint16_t TFA, uint16_t BFA) {
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tft.writecommand(ILI9341_VSCRDEF); // Vertical scroll definition
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tft.writedata(TFA >> 8);
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tft.writedata(TFA);
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tft.writedata((320 - TFA - BFA) >> 8);
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tft.writedata(320 - TFA - BFA);
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tft.writedata(BFA >> 8);
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tft.writedata(BFA);
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}
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int scroll_slow(int lines, int wait) {
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int yTemp = yStart;
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for (int i = 0; i < lines; i++) {
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yStart++;
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if (yStart == 320 - BOT_FIXED_AREA) yStart = TOP_FIXED_AREA;
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scrollAddress(yStart);
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delay(wait);
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}
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return yTemp;
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}
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void scrollAddress(uint16_t VSP) {
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tft.writecommand(ILI9341_VSCRSADD); // Vertical scrolling start address
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tft.writedata(VSP >> 8);
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tft.writedata(VSP);
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}
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