189 lines
6.3 KiB
C++
189 lines
6.3 KiB
C++
/*
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This sketch has been written to test the Processing screenshot client.
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It has been created to work with the TFT_eSPI library here:
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https://github.com/Bodmer/TFT_eSPI
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It sends screenshots to a PC running a Processing client sketch.
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The Processing IDE that will run the client sketch can be downloaded
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here: https://processing.org/
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The Processing sketch needed is contained within a tab attached to this
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Arduino sketch. Cut and copy that tab into the Processing IDE and run.
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This sketch uses the GLCD, 2, 4, 6 fonts only.
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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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Maximum recommended SPI clock rate is 27MHz when reading pixels, 40MHz
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seems to be OK with ILI9341 displays but this is above the manufacturers
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specifed maximum clock rate.
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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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// Created by: Bodmer 5/3/17
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// Updated by: Bodmer 10/3/17
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// Version: 0.06
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// MIT licence applies, all text above must be included in derivative works
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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 with default width and height
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unsigned long targetTime = 0;
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byte red = 31;
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byte green = 0;
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byte blue = 0;
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byte state = 0;
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unsigned int colour = red << 11; // Colour order is RGB 5+6+5 bits each
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void setup(void) {
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Serial.begin(921600);
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tft.init();
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tft.setRotation(0);
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tft.fillScreen(TFT_BLACK);
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randomSeed(analogRead(A0));
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targetTime = millis() + 1000;
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}
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void loop() {
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if (targetTime < millis()) {
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targetTime = millis() + 1500; // Wait a minimum of 1.5s
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tft.setRotation(random(4));
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rainbow_fill(); // Fill the screen with rainbow colours
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tft.setTextColor(TFT_BLACK); // Text background is not defined so it is transparent
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tft.setTextDatum(TC_DATUM); // Top Centre datum
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int xpos = tft.width()/2; // Centre of screen
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tft.setTextFont(0); // Select font 0 which is the Adafruit font
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tft.drawString("Original Adafruit font!", xpos, 5);
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// The new larger fonts do not need to use the .setCursor call, coords are embedded
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tft.setTextColor(TFT_BLACK); // Do not plot the background colour
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// Overlay the black text on top of the rainbow plot (the advantage of not drawing the backgorund colour!)
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tft.drawString("Font size 2", xpos, 14, 2); // Draw text centre at position xpos, 14 using font 2
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tft.drawString("Font size 4", xpos, 30, 4); // Draw text centre at position xpos, 30 using font 4
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tft.drawString("12.34", xpos, 54, 6); // Draw text centre at position xpos, 54 using font 6
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tft.drawString("12.34 is in font size 6", xpos, 92, 2); // Draw text centre at position xpos, 92 using font 2
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// Note the x position is the top of the font!
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// draw a floating point number
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float pi = 3.1415926; // Value to print
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int precision = 3; // Number of digits after decimal point
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int ypos = 110; // y position
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tft.setTextDatum(TR_DATUM); // Top Right datum so text butts neatly to xpos (right justified)
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tft.drawFloat(pi, precision, xpos, ypos, 2); // Draw rounded number and return new xpos delta for next print position
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tft.setTextDatum(TL_DATUM); // Top Left datum so text butts neatly to xpos (left justified)
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tft.drawString(" is pi", xpos, ypos, 2);
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tft.setTextSize(1); // We are using a font size multiplier of 1
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tft.setTextDatum(TC_DATUM); // Top Centre datum
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tft.setTextColor(TFT_BLACK); // Set text colour to black, no background (so transparent)
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tft.drawString("Transparent...", xpos, 125, 4); // Font 4
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tft.setTextColor(TFT_WHITE, TFT_BLACK); // Set text colour to white and background to black
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tft.drawString("White on black", xpos, 150, 4); // Font 4
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tft.setTextColor(TFT_GREEN, TFT_BLACK); // This time we will use green text on a black background
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tft.setTextFont(2); // Select font 2, now we do not need to specify the font in drawString()
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// An easier way to position text and blank old text is to set the datum and use width padding
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tft.setTextDatum(BC_DATUM); // Bottom centre for text datum
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tft.setTextPadding(tft.width() + 1); // Pad text to full screen width + 1 spare for +/-1 position rounding
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tft.drawString("Ode to a Small Lump of Green Putty", xpos, 230 - 32);
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tft.drawString("I Found in My Armpit One Midsummer", xpos, 230 - 16);
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tft.drawString("Morning", xpos, 230);
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tft.setTextDatum(TL_DATUM); // Reset to top left for text datum
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tft.setTextPadding(0); // Reset text padding to 0 pixels
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// Now call the screen server to send a copy of the TFT screen to the PC running the Processing client sketch
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screenServer();
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}
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}
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// Fill screen with a rainbow pattern
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void rainbow_fill()
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{
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// The colours and state are not initialised so the start colour changes each time the funtion is called
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int rotation = tft.getRotation();
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tft.setRotation(random(4));
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for (int i = tft.height() - 1; i >= 0; i--) {
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// This is a "state machine" that ramps up/down the colour brightnesses in sequence
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switch (state) {
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case 0:
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green ++;
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if (green == 64) {
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green = 63;
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state = 1;
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}
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break;
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case 1:
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red--;
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if (red == 255) {
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red = 0;
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state = 2;
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}
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break;
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case 2:
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blue ++;
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if (blue == 32) {
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blue = 31;
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state = 3;
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}
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break;
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case 3:
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green --;
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if (green == 255) {
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green = 0;
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state = 4;
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}
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break;
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case 4:
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red ++;
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if (red == 32) {
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red = 31;
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state = 5;
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}
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break;
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case 5:
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blue --;
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if (blue == 255) {
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blue = 0;
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state = 0;
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}
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break;
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}
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colour = red << 11 | green << 5 | blue;
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// Draw a line 1 pixel wide in the selected colour
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tft.drawFastHLine(0, i, tft.width(), colour); // in this example tft.width() returns the pixel width of the display
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}
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tft.setRotation(rotation);
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}
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