Teensy LC - U8G2 Library with 19264 Display SPI Issue getting communication...

[Brion Sohn]

So I have tried a ton or stuff, Seaching the web, looking on hear at similar topics and I probably am just Missing something completely but I cannot get even the basic "Hello World" u8G2 example to work OK Display.

So here is the basic sketch.

/*

  HelloWorld.ino

  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)

  Copyright (c) 2016, olikraus@gmail.com
  All rights reserved.

  Redistribution and use in source and binary forms, with or without modification, 
  are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this list 
    of conditions and the following disclaimer.
    
  * Redistributions in binary form must reproduce the above copyright notice, this 
    list of conditions and the following disclaimer in the documentation and/or other 
    materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  

*/

#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

/*
  U8g2lib Example Overview:
    Frame Buffer Examples: clearBuffer/sendBuffer. Fast, but may not work with all Arduino boards because of RAM consumption
    Page Buffer Examples: firstPage/nextPage. Less RAM usage, should work with all Arduino boards.
    U8x8 Text Only Example: No RAM usage, direct communication with display controller. No graphics, 8x8 Text only.
    
*/

// Please UNCOMMENT one of the contructor lines below
// U8g2 Contructor List (Frame Buffer)
// The complete list is available here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp
// Please update the pin numbers according to your setup. Use U8X8_PIN_NONE if the reset pin is not connected

/// MANY DISPLAY TYPES DELETED 

//U8G2_UC1609_SLG19264_F_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8); 
U8G2_UC1609_SLG19264_F_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 10, /* dc=*/ 9, /* reset=*/ 8);  


// End of constructor list


void setup(void) {
  u8g2.begin();
}

void loop(void) {
  u8g2.clearBuffer();					// clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr);	// choose a suitable font
  u8g2.drawStr(0,10,"Hello World!");	// write something to the internal memory
  u8g2.sendBuffer();					// transfer internal memory to the display
  delay(1000);  
}

I have got this to work on a normal Arduino Uno and an Arduino Pro Micro but for some reason I am either missing the Pins needed or something I need to do within the sketch to get the SPI Communication to work:

I have the display hooked up in the following way to the Teensy LC:

Display K and A Backlight LED is connected and On 

Teensy GND --> 19264-05 v3.2 GND
Teensy 3V --> 19264-05 v3.2 VDD
Teensy Pin 13 --> 19264-05 v3.2 SCK
Teensy Pin 11 --> 19264-05 v3.2 SDA
Teensy Pin 10 --> 19264-05 v3.2 CS (chosen pin standard position)
Teensy Pin 9 --> 19264-05 v3.2 CD (chosen pin standard position)
Teensy Pin 8 --> 19264-05 v3.2 RST (chosen pin standard position)

Basically I know the code works with the Arduinos (UNO and ProMicro) and have used all the same hookups to the MOSI (SDA), SCK, and chosen pins on those and it worked.. So I am either missing something in connection OR I have to change something in the CODE/Library that I have just not been able to find reference too online and I am clueless to know what it is.

Any help to get this working with the Teensy LC would be greatly appreciated as that is the processor of choice which I want to use.

 

[Brion Sohn]

OK So I feel really Stupid.. I have been using the LC on a breadboard for ages now and for some reason decided to pull it off the board.. AND ... Well.. it turns out that somehow when I placed the teensy on the Breadboard the first tim Pins 12 and 13 decided to migrate to the same position on the board (not sure how that happened)..

But in any case now that I have them in separate positions on the board it now works as intended.. sometimes it is the small things causing the biggest Headaches.