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Thread: Teensy 3.2 - pjrc color touchscreen help

  1. #1

    Teensy 3.2 - pjrc color touchscreen help

    i have wired up the color touch screen per this pin out and did not use any alternate pins, except for reset and i did not wire any of the touch screen lines.

    https://www.pjrc.com/store/display_ili9341_touch.html

    At first i only had a white screen and could not get anything to display.
    I had found that someone else was able to get things working once they wired up reset to the teensy and i included this in my sketch.
    The graphics test hangs up on the "Waiting for Arduino Serial Monitor..."

    any thoughts why the graphics test would hang up?

    Code:
    #include "SPI.h"
    #include "ILI9341_t3.h"
    
    // For the Adafruit shield, these are the default.
    #define TFT_DC 9
    #define TFT_CS 10
    #define TFT_RST 8
    
    ILI9341_t3 tft = ILI9341_t3(TFT_CS, TFT_DC, TFT_RST);
    
    void setup() {
      tft.begin();
      tft.fillScreen(ILI9341_BLACK);
      tft.setTextColor(ILI9341_YELLOW);
      tft.setTextSize(2);
      tft.println("Waiting for Arduino Serial Monitor...");
    
      Serial.begin(9600);
      while (!Serial) ; // wait for Arduino Serial Monitor
      Serial.println("ILI9341 Test!"); 
    
      // read diagnostics (optional but can help debug problems)
      uint8_t x = tft.readcommand8(ILI9341_RDMODE);
      Serial.print("Display Power Mode: 0x"); Serial.println(x, HEX);
      x = tft.readcommand8(ILI9341_RDMADCTL);
      Serial.print("MADCTL Mode: 0x"); Serial.println(x, HEX);
      x = tft.readcommand8(ILI9341_RDPIXFMT);
      Serial.print("Pixel Format: 0x"); Serial.println(x, HEX);
      x = tft.readcommand8(ILI9341_RDIMGFMT);
      Serial.print("Image Format: 0x"); Serial.println(x, HEX);
      x = tft.readcommand8(ILI9341_RDSELFDIAG);
      Serial.print("Self Diagnostic: 0x"); Serial.println(x, HEX); 
      
      Serial.println(F("Benchmark                Time (microseconds)"));
    
      Serial.print(F("Screen fill              "));
      Serial.println(testFillScreen());
      delay(200);
    
      Serial.print(F("Text                     "));
      Serial.println(testText());
      delay(600);
    
      Serial.print(F("Lines                    "));
      Serial.println(testLines(ILI9341_CYAN));
      delay(200);
    
      Serial.print(F("Horiz/Vert Lines         "));
      Serial.println(testFastLines(ILI9341_RED, ILI9341_BLUE));
      delay(200);
    
      Serial.print(F("Rectangles (outline)     "));
      Serial.println(testRects(ILI9341_GREEN));
      delay(200);
    
      Serial.print(F("Rectangles (filled)      "));
      Serial.println(testFilledRects(ILI9341_YELLOW, ILI9341_MAGENTA));
      delay(200);
    
      Serial.print(F("Circles (filled)         "));
      Serial.println(testFilledCircles(10, ILI9341_MAGENTA));
    
      Serial.print(F("Circles (outline)        "));
      Serial.println(testCircles(10, ILI9341_WHITE));
      delay(200);
    
      Serial.print(F("Triangles (outline)      "));
      Serial.println(testTriangles());
      delay(200);
    
      Serial.print(F("Triangles (filled)       "));
      Serial.println(testFilledTriangles());
      delay(200);
    
      Serial.print(F("Rounded rects (outline)  "));
      Serial.println(testRoundRects());
      delay(200);
    
      Serial.print(F("Rounded rects (filled)   "));
      Serial.println(testFilledRoundRects());
      delay(200);
    
      Serial.println(F("Done!"));
    
    }
    
    
    void loop(void) {
      for(uint8_t rotation=0; rotation<4; rotation++) {
        tft.setRotation(rotation);
        testText();
        delay(1000);
      }
    }
    
    unsigned long testFillScreen() {
      unsigned long start = micros();
      tft.fillScreen(ILI9341_BLACK);
      tft.fillScreen(ILI9341_RED);
      tft.fillScreen(ILI9341_GREEN);
      tft.fillScreen(ILI9341_BLUE);
      tft.fillScreen(ILI9341_BLACK);
      return micros() - start;
    }
    
    unsigned long testText() {
      tft.fillScreen(ILI9341_BLACK);
      unsigned long start = micros();
      tft.setCursor(0, 0);
      tft.setTextColor(ILI9341_WHITE);  tft.setTextSize(1);
      tft.println("Hello World!");
      tft.setTextColor(ILI9341_YELLOW); tft.setTextSize(2);
      tft.println(1234.56);
      tft.setTextColor(ILI9341_RED);    tft.setTextSize(3);
      tft.println(0xDEADBEEF, HEX);
      tft.println();
      tft.setTextColor(ILI9341_GREEN);
      tft.setTextSize(5);
      tft.println("Groop");
      tft.setTextSize(2);
      tft.println("I implore thee,");
      tft.setTextSize(1);
      tft.println("my foonting turlingdromes.");
      tft.println("And hooptiously drangle me");
      tft.println("with crinkly bindlewurdles,");
      tft.println("Or I will rend thee");
      tft.println("in the gobberwarts");
      tft.println("with my blurglecruncheon,");
      tft.println("see if I don't!");
      return micros() - start;
    }
    
    unsigned long testLines(uint16_t color) {
      unsigned long start, t;
      int           x1, y1, x2, y2,
                    w = tft.width(),
                    h = tft.height();
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1 = y1 = 0;
      y2    = h - 1;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = w - 1;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
      t     = micros() - start; // fillScreen doesn't count against timing
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1    = w - 1;
      y1    = 0;
      y2    = h - 1;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = 0;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
      t    += micros() - start;
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1    = 0;
      y1    = h - 1;
      y2    = 0;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = w - 1;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
      t    += micros() - start;
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1    = w - 1;
      y1    = h - 1;
      y2    = 0;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = 0;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
    
      return micros() - start;
    }
    
    unsigned long testFastLines(uint16_t color1, uint16_t color2) {
      unsigned long start;
      int           x, y, w = tft.width(), h = tft.height();
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(y=0; y<h; y+=5) tft.drawFastHLine(0, y, w, color1);
      for(x=0; x<w; x+=5) tft.drawFastVLine(x, 0, h, color2);
    
      return micros() - start;
    }
    
    unsigned long testRects(uint16_t color) {
      unsigned long start;
      int           n, i, i2,
                    cx = tft.width()  / 2,
                    cy = tft.height() / 2;
    
      tft.fillScreen(ILI9341_BLACK);
      n     = min(tft.width(), tft.height());
      start = micros();
      for(i=2; i<n; i+=6) {
        i2 = i / 2;
        tft.drawRect(cx-i2, cy-i2, i, i, color);
      }
    
      return micros() - start;
    }
    
    unsigned long testFilledRects(uint16_t color1, uint16_t color2) {
      unsigned long start, t = 0;
      int           n, i, i2,
                    cx = tft.width()  / 2 - 1,
                    cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      n = min(tft.width(), tft.height()) - 1;
      for(i=n; i>0; i-=6) {
        i2    = i / 2;
        start = micros();
        tft.fillRect(cx-i2, cy-i2, i, i, color1);
        t    += micros() - start;
        // Outlines are not included in timing results
        tft.drawRect(cx-i2, cy-i2, i, i, color2);
      }
    
      return t;
    }
    
    unsigned long testFilledCircles(uint8_t radius, uint16_t color) {
      unsigned long start;
      int x, y, w = tft.width(), h = tft.height(), r2 = radius * 2;
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(x=radius; x<w; x+=r2) {
        for(y=radius; y<h; y+=r2) {
          tft.fillCircle(x, y, radius, color);
        }
      }
    
      return micros() - start;
    }
    
    unsigned long testCircles(uint8_t radius, uint16_t color) {
      unsigned long start;
      int           x, y, r2 = radius * 2,
                    w = tft.width()  + radius,
                    h = tft.height() + radius;
    
      // Screen is not cleared for this one -- this is
      // intentional and does not affect the reported time.
      start = micros();
      for(x=0; x<w; x+=r2) {
        for(y=0; y<h; y+=r2) {
          tft.drawCircle(x, y, radius, color);
        }
      }
    
      return micros() - start;
    }
    
    unsigned long testTriangles() {
      unsigned long start;
      int           n, i, cx = tft.width()  / 2 - 1,
                          cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      n     = min(cx, cy);
      start = micros();
      for(i=0; i<n; i+=5) {
        tft.drawTriangle(
          cx    , cy - i, // peak
          cx - i, cy + i, // bottom left
          cx + i, cy + i, // bottom right
          tft.color565(0, 0, i));
      }
    
      return micros() - start;
    }
    
    unsigned long testFilledTriangles() {
      unsigned long start, t = 0;
      int           i, cx = tft.width()  / 2 - 1,
                       cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(i=min(cx,cy); i>10; i-=5) {
        start = micros();
        tft.fillTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i,
          tft.color565(0, i, i));
        t += micros() - start;
        tft.drawTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i,
          tft.color565(i, i, 0));
      }
    
      return t;
    }
    
    unsigned long testRoundRects() {
      unsigned long start;
      int           w, i, i2,
                    cx = tft.width()  / 2 - 1,
                    cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      w     = min(tft.width(), tft.height()) - 1;
      start = micros();
      for(i=0; i<w; i+=6) {
        i2 = i / 2;
        tft.drawRoundRect(cx-i2, cy-i2, i, i, i/8, tft.color565(i, 0, 0));
      }
    
      return micros() - start;
    }
    
    unsigned long testFilledRoundRects() {
      unsigned long start;
      int           i, i2,
                    cx = tft.width()  / 2 - 1,
                    cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(i=min(tft.width(), tft.height()) - 1; i>20; i-=6) {
        i2 = i / 2;
        tft.fillRoundRect(cx-i2, cy-i2, i, i, i/8, tft.color565(0, i, 0));
      }
    
      return micros() - start;
    }

  2. #2
    Senior Member+ KurtE's Avatar
    Join Date
    Jan 2014
    Posts
    6,959
    Did you plug in the USB cable? Notice in the code right after the Waiting for... The code hangs in the while(!Serial) ;

  3. #3
    yup, no joy

  4. #4
    Senior Member+ KurtE's Avatar
    Join Date
    Jan 2014
    Posts
    6,959
    Did anything print out in the Terminal monitor window?

  5. #5
    ok...
    I deleted the serial stuff and am now running this sketch:

    The good news is that now the hello world, numbers, group stuff message rotates around the screen.
    So at least my wiring and teensy are in working order.

    Could you please point me to some good learning tutorials with this lcd?

    Code:
    #include "SPI.h"
    #include "ILI9341_t3.h"
    
    // For the Adafruit shield, these are the default.
    #define TFT_DC 9
    #define TFT_CS 10
    #define TFT_RST 8
    
    ILI9341_t3 tft = ILI9341_t3(TFT_CS, TFT_DC, TFT_RST);
    
    void setup() {
      tft.begin();
      tft.fillScreen(ILI9341_BLACK);
      tft.setTextColor(ILI9341_YELLOW);
      tft.setTextSize(2);
      tft.println("Waiting for Arduino Serial Monitor...");
    
    
    }
    
    
    void loop(void) {
      for(uint8_t rotation=0; rotation<4; rotation++) {
        tft.setRotation(rotation);
        testText();
        delay(1000);
      }
    }
    
    unsigned long testFillScreen() {
      unsigned long start = micros();
      tft.fillScreen(ILI9341_BLACK);
      tft.fillScreen(ILI9341_RED);
      tft.fillScreen(ILI9341_GREEN);
      tft.fillScreen(ILI9341_BLUE);
      tft.fillScreen(ILI9341_BLACK);
      return micros() - start;
    }
    
    unsigned long testText() {
      tft.fillScreen(ILI9341_BLACK);
      unsigned long start = micros();
      tft.setCursor(0, 0);
      tft.setTextColor(ILI9341_WHITE);  tft.setTextSize(1);
      tft.println("Hello World!");
      tft.setTextColor(ILI9341_YELLOW); tft.setTextSize(2);
      tft.println(1234.56);
      tft.setTextColor(ILI9341_RED);    tft.setTextSize(3);
      tft.println(0xDEADBEEF, HEX);
      tft.println();
      tft.setTextColor(ILI9341_GREEN);
      tft.setTextSize(5);
      tft.println("Groop");
      tft.setTextSize(2);
      tft.println("I implore thee,");
      tft.setTextSize(1);
      tft.println("my foonting turlingdromes.");
      tft.println("And hooptiously drangle me");
      tft.println("with crinkly bindlewurdles,");
      tft.println("Or I will rend thee");
      tft.println("in the gobberwarts");
      tft.println("with my blurglecruncheon,");
      tft.println("see if I don't!");
      return micros() - start;
    }
    
    unsigned long testLines(uint16_t color) {
      unsigned long start, t;
      int           x1, y1, x2, y2,
                    w = tft.width(),
                    h = tft.height();
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1 = y1 = 0;
      y2    = h - 1;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = w - 1;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
      t     = micros() - start; // fillScreen doesn't count against timing
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1    = w - 1;
      y1    = 0;
      y2    = h - 1;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = 0;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
      t    += micros() - start;
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1    = 0;
      y1    = h - 1;
      y2    = 0;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = w - 1;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
      t    += micros() - start;
    
      tft.fillScreen(ILI9341_BLACK);
    
      x1    = w - 1;
      y1    = h - 1;
      y2    = 0;
      start = micros();
      for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
      x2    = 0;
      for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
    
      return micros() - start;
    }
    
    unsigned long testFastLines(uint16_t color1, uint16_t color2) {
      unsigned long start;
      int           x, y, w = tft.width(), h = tft.height();
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(y=0; y<h; y+=5) tft.drawFastHLine(0, y, w, color1);
      for(x=0; x<w; x+=5) tft.drawFastVLine(x, 0, h, color2);
    
      return micros() - start;
    }
    
    unsigned long testRects(uint16_t color) {
      unsigned long start;
      int           n, i, i2,
                    cx = tft.width()  / 2,
                    cy = tft.height() / 2;
    
      tft.fillScreen(ILI9341_BLACK);
      n     = min(tft.width(), tft.height());
      start = micros();
      for(i=2; i<n; i+=6) {
        i2 = i / 2;
        tft.drawRect(cx-i2, cy-i2, i, i, color);
      }
    
      return micros() - start;
    }
    
    unsigned long testFilledRects(uint16_t color1, uint16_t color2) {
      unsigned long start, t = 0;
      int           n, i, i2,
                    cx = tft.width()  / 2 - 1,
                    cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      n = min(tft.width(), tft.height()) - 1;
      for(i=n; i>0; i-=6) {
        i2    = i / 2;
        start = micros();
        tft.fillRect(cx-i2, cy-i2, i, i, color1);
        t    += micros() - start;
        // Outlines are not included in timing results
        tft.drawRect(cx-i2, cy-i2, i, i, color2);
      }
    
      return t;
    }
    
    unsigned long testFilledCircles(uint8_t radius, uint16_t color) {
      unsigned long start;
      int x, y, w = tft.width(), h = tft.height(), r2 = radius * 2;
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(x=radius; x<w; x+=r2) {
        for(y=radius; y<h; y+=r2) {
          tft.fillCircle(x, y, radius, color);
        }
      }
    
      return micros() - start;
    }
    
    unsigned long testCircles(uint8_t radius, uint16_t color) {
      unsigned long start;
      int           x, y, r2 = radius * 2,
                    w = tft.width()  + radius,
                    h = tft.height() + radius;
    
      // Screen is not cleared for this one -- this is
      // intentional and does not affect the reported time.
      start = micros();
      for(x=0; x<w; x+=r2) {
        for(y=0; y<h; y+=r2) {
          tft.drawCircle(x, y, radius, color);
        }
      }
    
      return micros() - start;
    }
    
    unsigned long testTriangles() {
      unsigned long start;
      int           n, i, cx = tft.width()  / 2 - 1,
                          cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      n     = min(cx, cy);
      start = micros();
      for(i=0; i<n; i+=5) {
        tft.drawTriangle(
          cx    , cy - i, // peak
          cx - i, cy + i, // bottom left
          cx + i, cy + i, // bottom right
          tft.color565(0, 0, i));
      }
    
      return micros() - start;
    }
    
    unsigned long testFilledTriangles() {
      unsigned long start, t = 0;
      int           i, cx = tft.width()  / 2 - 1,
                       cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(i=min(cx,cy); i>10; i-=5) {
        start = micros();
        tft.fillTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i,
          tft.color565(0, i, i));
        t += micros() - start;
        tft.drawTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i,
          tft.color565(i, i, 0));
      }
    
      return t;
    }
    
    unsigned long testRoundRects() {
      unsigned long start;
      int           w, i, i2,
                    cx = tft.width()  / 2 - 1,
                    cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      w     = min(tft.width(), tft.height()) - 1;
      start = micros();
      for(i=0; i<w; i+=6) {
        i2 = i / 2;
        tft.drawRoundRect(cx-i2, cy-i2, i, i, i/8, tft.color565(i, 0, 0));
      }
    
      return micros() - start;
    }
    
    unsigned long testFilledRoundRects() {
      unsigned long start;
      int           i, i2,
                    cx = tft.width()  / 2 - 1,
                    cy = tft.height() / 2 - 1;
    
      tft.fillScreen(ILI9341_BLACK);
      start = micros();
      for(i=min(tft.width(), tft.height()) - 1; i>20; i-=6) {
        i2 = i / 2;
        tft.fillRoundRect(cx-i2, cy-i2, i, i, i/8, tft.color565(0, i, 0));
      }
    
      return micros() - start;
    }

  6. #6
    to answer your other question:
    No, the only thing i got was the waiting for serial message

  7. #7
    Senior Member
    Join Date
    Apr 2013
    Posts
    1,928
    In terms of the calls to use, the emerged from they adafruit GFX library https://learn.adafruit.com/adafruit-...brary/overview, see also the examples. And just to confirm what that code did, the problem wasn't the serial so much as the while(!serial) line which is there to halt the code until a terminal window is open and ready. Which is important for a seeing the benchmarks, less useful for first time users such as us.
    Last edited by GremlinWrangler; 12-04-2016 at 02:12 AM. Reason: Spelling

  8. #8
    i believe another thing that is messing me up, is that i tried to follow this tutorial:
    https://www.arduino.cc/en/Guide/TFT
    but those code examples along with the TFT library doesn't seem to jive with this display.

  9. #9
    Senior Member+ defragster's Avatar
    Join Date
    Feb 2015
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    Indeed - unless you have that display - that tutorial Library info won't jive with what works on your display beyond the general concepts that are common.

    When TeensyDuino installs it brings in device specific libraries and samples to the IDE under "File / Examples" ( adafruit_ili9341 or XPT2046_Touchscreen and ILI9341_t3 ) - which you probably found to get the graphics test. Those examples and forum threads are all I've seen.

    As far as "while( !Serial )" that waits not just for a USB cable to be plugged in - but for a terminal program to open and start a connection to the resultant USB port on the PC so no serial output is missed. With a change to bypass after a given time it will wait in this case for 4 seconds and then continue before/without Serial ever connecting: "while( !Serial && millis()<4000 )". Then if serial never connects those .print() bits just get lost and the sketch doesn't doesn't stop waiting for it or care afterwards.

  10. #10
    Thanks I'll give that a try.
    This brings up a concern for me though.
    I bought the pjrc color touch screen to learn on and it is nice, but what happens when I decide to upgrade the display? My code wont work because there are key words specific to the ILI9341_t3.h library?
    I'm having trouble understanding hardware specific libraries and code.
    What is universal and what is unique?

  11. #11
    Senior Member+ Frank B's Avatar
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    Quote Originally Posted by j_dunavin View Post
    Thanks I'll give that a try.
    This brings up a concern for me though.
    I bought the pjrc color touch screen to learn on and it is nice, but what happens when I decide to upgrade the display? My code wont work because there are key words specific to the ILI9341_t3.h library?
    I'm having trouble understanding hardware specific libraries and code.
    What is universal and what is unique?
    Every chip needs a different driver- so yes, you need different code for different display-chips. There is no "plug and play" on microcontrollers.

    A library that supports different kinds of displays is UTFT - but, it is more general and not not optimized for teensy (as far as i know) - so, i guess, it will be slower.

  12. #12
    Thanks for the heads up on UTFT.
    My project isn't too high speed or too graphics intensive.
    I'd much rather have a code that I could use along the way as I progress to a better display.

    Thanks for all the help!

  13. #13
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    On thing to note with changing displays is that many of them have drifted to a sort of standard that is exemplified by the adafruit gfx library https://learn.adafruit.com/adafruit-...brary/overview but the commands and structure tend to be supported more or less by all libraries. The t3 version of the LCD library was built on this so in many cases you can use just swap out your display declaration and have things work.

    That said if you are building a user interface or similar there is a lot to be said with writing helper routines for the graphics that put all your display hardware calls in one place (possibly off in a tab) to make updateing to a new display easier.

  14. #14
    That is brilliant, I hadn't thought of that!

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