mharizanov · November 12, 2018 12:59 · Nov 12, 2018 · Nov 12, 2018
diff --git a/gistfile1.txt → thematrix.ino b/gistfile1.txt → thematrix.ino
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,114 @@
+// A fun MATRIX-like screen demo of scrolling
+// Screen will flicker initially until fully drawn
+// then scroll smoothly
+
+#define ILI9341_VSCRDEF 0x33
+#include "Adafruit_GFX.h"
+#include "Adafruit_ILI9341.h"
+#include <SPI.h>
+SPIClass SPI2(HSPI);
+
+#define _cs   15  // goes to TFT CS
+#define _dc   2  // goes to TFT DC
+#define _mosi 13  // goes to TFT MOSI
+#define _sclk 14  // goes to TFT SCK/CLK
+#define _rst  27  // goes to TFT RESET
+#define _miso     // leave unconnected
+#define TFT_BKLT 4
+
+#define TEXT_HEIGHT 8 // Height of text to be printed and scrolled
+#define BOT_FIXED_AREA 0  // Number of lines in bottom fixed area (lines counted from bottom of screen)
+#define TOP_FIXED_AREA 0 // Number of lines in top fixed area (lines counted from top of screen)
+
+Adafruit_ILI9341 tft = Adafruit_ILI9341(_cs, _dc, _rst);
+
+uint16_t yStart = TOP_FIXED_AREA;
+uint16_t yArea = 320 - TOP_FIXED_AREA - BOT_FIXED_AREA;
+uint16_t yDraw = 320 - BOT_FIXED_AREA - TEXT_HEIGHT;
+byte pos[42];
+uint16_t xPos = 0;
+
+void write_cmd(byte b) {
+  digitalWrite(_dc,LOW);
+  digitalWrite(_cs, LOW);
+  SPI2.write(b);
+  digitalWrite(_cs,HIGH);
+}
+
+void write_data(byte b) {
+  digitalWrite(_dc, HIGH);
+  digitalWrite(_cs, LOW);
+  SPI2.write(b);
+  digitalWrite(_cs,HIGH);
+}
+
+void setup() {
+  Serial.begin(115200);
+  pinMode(TFT_BKLT, OUTPUT);
+  digitalWrite(TFT_BKLT,LOW);
+
+  SPI2.setHwCs(true);
+  SPI2.begin();
+  SPI2.setFrequency(80000000);
+  tft.begin(80000000,SPI2);
+  tft.setRotation(0);
+  tft.fillScreen(ILI9341_BLACK);
+  setupScrollArea(TOP_FIXED_AREA, BOT_FIXED_AREA);
+}
+
+void loop(void) {
+  // First fill the screen with randomt streaks of characters
+  for (int j = 0; j < 400; j += TEXT_HEIGHT) {
+    int color;
+    for (int i = 0; i < 40; i++) {
+      if (pos[i] > 20) pos[i] -= 3; // Rapid fade initially brightness values
+      if (pos[i] > 0) pos[i] -= 1; // Slow fade later
+      if (random(20) == 1) pos[i] = 63; // ~1 in 20 probability of a new character
+      color = pos[i] << 5; // Set the character brightness
+      if (pos[i] == 63) color = ILI9341_WHITE; // Draw white character
+      tft.drawChar( xPos, yDraw, random(32, 128), color, ILI9341_BLACK,  1); // Draw the character
+      xPos+=8;    
+    }
+    yDraw = scroll_slow(TEXT_HEIGHT, 8); // Scroll, 14ms per pixel line
+    xPos = 0;
+  }
+
+  //tft.setRotation(2);
+  //tft.setTextColor(63 << 5, ILI9341_BLACK);
+  //tft.drawCentreString("MATRIX",120,60,4);
+  //tft.setRotation(0);
+
+  // Now scroll smoothly forever
+  while (1) yDraw = scroll_slow(320,8); // Scroll 320 (arbitrary number!) lines, 10ms per line
+
+}
+
+void setupScrollArea(uint16_t TFA, uint16_t BFA) {
+  write_cmd(ILI9341_VSCRDEF); // Vertical scroll definition
+  write_data(TFA >> 8);
+  write_data(TFA);
+  write_data((320 - TFA - BFA) >> 8);
+  write_data(320 - TFA - BFA);
+  write_data(BFA >> 8);
+  write_data(BFA);
+}
+
+int scroll_slow(int lines, int wait) {
+  int yTemp = yStart;
+  for (int i = 0; i < lines; i++) {
+    yStart++;
+    if (yStart == 320 - BOT_FIXED_AREA) yStart = TOP_FIXED_AREA;
+    scrollAddress(yStart);
+    delay(wait);
+  }
+  return  yTemp;
+}
+
+void scrollAddress(uint16_t VSP) {
+  write_cmd(ILI9341_VSCRSADD); // Vertical scrolling start address
+  write_data(VSP >> 8);
+  write_data(VSP);
+}
+
+
+
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