acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
TFT_Matrix.ino (2997B)
      1 // A fun MATRIX-like screen demo of scrolling
      2 // Screen will flicker initially until fully drawn
      3 // then scroll smoothly
      4 
      5 // Needs GLCD font
      6 
      7 /*
      8  Make sure all the display driver and pin connections are correct by
      9  editing the User_Setup.h file in the TFT_eSPI library folder.
     10 
     11  #########################################################################
     12  ###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
     13  #########################################################################
     14 */
     15 
     16 #include <TFT_eSPI.h> // Hardware-specific library
     17 #include <SPI.h>
     18 
     19 TFT_eSPI tft = TFT_eSPI();       // Invoke custom library
     20 
     21 #define TEXT_HEIGHT 8 // Height of text to be printed and scrolled
     22 #define BOT_FIXED_AREA 0  // Number of lines in bottom fixed area (lines counted from bottom of screen)
     23 #define TOP_FIXED_AREA 0  // Number of lines in top fixed area (lines counted from top of screen)
     24 
     25 uint16_t yStart = TOP_FIXED_AREA;
     26 uint16_t yArea = 320 - TOP_FIXED_AREA - BOT_FIXED_AREA;
     27 uint16_t yDraw = 320 - BOT_FIXED_AREA - TEXT_HEIGHT;
     28 byte     pos[42];
     29 uint16_t xPos = 0;
     30 
     31 void setup() {
     32   Serial.begin(115200);
     33   randomSeed(analogRead(A0));
     34   tft.init();
     35   tft.setRotation(0);
     36   tft.fillScreen(ILI9341_BLACK);
     37   setupScrollArea(TOP_FIXED_AREA, BOT_FIXED_AREA);
     38 }
     39 
     40 void loop(void) {
     41   // First fill the screen with random streaks of characters
     42   for (int j = 0; j < 600; j += TEXT_HEIGHT) {
     43     for (int i = 0; i < 40; i++) {
     44       if (pos[i] > 20) pos[i] -= 3; // Rapid fade initially brightness values
     45       if (pos[i] > 0) pos[i] -= 1; // Slow fade later
     46       if ((random(20) == 1) && (j<400)) pos[i] = 63; // ~1 in 20 probability of a new character
     47       tft.setTextColor(pos[i] << 5, ILI9341_BLACK); // Set the green character brightness
     48       if (pos[i] == 63) tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK); // Draw white character
     49       xPos += tft.drawChar(random(32, 128), xPos, yDraw, 1); // Draw the character
     50     }
     51     yDraw = scroll_slow(TEXT_HEIGHT, 14); // Scroll, 14ms per pixel line
     52     xPos = 0;
     53   }
     54 
     55   //tft.setRotation(2);
     56   //tft.setTextColor(63 << 5, ILI9341_BLACK);
     57   //tft.drawCentreString("MATRIX",120,60,4);
     58   //tft.setRotation(0);
     59 
     60   // Now scroll smoothly forever
     61   while (1) {yield(); yDraw = scroll_slow(320,5); }// Scroll 320 lines, 5ms per line
     62 
     63 }
     64 
     65 void setupScrollArea(uint16_t TFA, uint16_t BFA) {
     66   tft.writecommand(ILI9341_VSCRDEF); // Vertical scroll definition
     67   tft.writedata(TFA >> 8);
     68   tft.writedata(TFA);
     69   tft.writedata((320 - TFA - BFA) >> 8);
     70   tft.writedata(320 - TFA - BFA);
     71   tft.writedata(BFA >> 8);
     72   tft.writedata(BFA);
     73 }
     74 
     75 int scroll_slow(int lines, int wait) {
     76   int yTemp = yStart;
     77   for (int i = 0; i < lines; i++) {
     78     yStart++;
     79     if (yStart == 320 - BOT_FIXED_AREA) yStart = TOP_FIXED_AREA;
     80     scrollAddress(yStart);
     81     delay(wait);
     82   }
     83   return  yTemp;
     84 }
     85 
     86 void scrollAddress(uint16_t VSP) {
     87   tft.writecommand(ILI9341_VSCRSADD); // Vertical scrolling start address
     88   tft.writedata(VSP >> 8);
     89   tft.writedata(VSP);
     90 }
     91 
     92 
     93