can adafruit raspberry 2.8" screen be connect to digiX ****Now working****

[Amus3d]

Hi i've bought some 2.8" tft from adafruit for my raspberrys and wonder if they could be connect to the digix since it that same screen and chip as the 2.8" arduino uno/mega version.

https://learn.adafruit.com/adafruit-pitft-28-inch-resistive-touchscreen-display-raspberry-pi

https://learn.adafruit.com/system/assets/assets/000/013/040/original/raspberry_pi_pitftschem.png?1387563188

if so any ideas how to connect it to digix and what lib i should use

cheers.

[dougal]

The screen seems to use SPI for communication, plus a couple of extra GPIOs, so it certainly *should* be possible. But my quick Googling didn't turn up any Arduino libraries or how-tos... 

[Amus3d]

i couldn't find anything either, other than the screen and chip is the same as the arduino version just different pcb board. and think the raspberry version, uses less pins than the arduino version.

cheers any way

[Amus3d]

not sure if iam on the right track,Using Example UTFT_Demo320x240_Serial chip ILI9341_S5P

Raspberry pi pins

3	5	19	21	23	24
SDA	SCL	MOSI	MISO	SCLK	CE0

DigiX

8	9	10	11	12
WR	RS	Serial	RST	CS

DigiX pin   8 = pi : 19
DigiX pin   9 = pi : ?
DigiX pin 10 = pi : ?
DigiX pin 11 = pi : ?
DigiX pin 12 = pi : 24

[Amus3d]

Got  picture .

Raspberry Pins used

1,2   =  due 3.3volts
6      =  due gnd   

19        due MOSI
21        due MISO
23        due SCK

22        due 9
24        due 10
26        due 11 not sure why pin 11 but if i use pin 8 picture is reversed as if youre looking from the other side of screen lol

using lib https://github.com/marekburiak/ILI9341_due/tree/master

[dougal]

Excellent! I have one of these in my parts collection, waiting for me to solder the headers on. Now I know that if I ever decide I don't need it for my RPi, I can repurpose it on my DigiX.

[Amus3d]

  just need to figure out touch pad now

[Amus3d]

Wrote a little program that can draw from the Serial window,

clr(255,255,255) clears screen
setColor( 0 , 0 , 0 ) to setColor( 255 , 255 , 255 )
arc( posX , posY , size ,  lineThickness , startCircle , endcircle )
ie. arc( 100 , 100 , 50 , 1 , 40 , 360 )

will add more, text(), squ() etc..

Code: [Select]

#include <SPI.h>
#include <ILI_SdSpi.h>
#include <ILI_SdFatConfig.h>
#include <ILI9341_due_gText.h>
#include <ILI9341_due.h>
#include "fonts\Arial_bold_14.h"


#define TFT_DC 9
#define TFT_CS 10

ILI9341_due tft = ILI9341_due(TFT_CS, TFT_DC);
char textBuff[20];
char charTemp[20];
int color[3];

ILI9341_due_gText t1(&tft);
ILI9341_due_gText t2(&tft);
ILI9341_due_gText t3(&tft);
uint16_t colorLightGray = tft.color565(192,192,192);
uint16_t colorGray      = tft.color565(127,127,127);
uint16_t colorDarkGray  = tft.color565(64,64,64);

// Globals

uint16_t radius = 55;
uint16_t s1x = 0;
uint16_t s1y = 10;
int myDelay = 2000;

void setup() {
  Serial.begin(9600);

   tft.begin();
   tft.setRotation(3);
   delay(500);
   screenLoading();
   
   while(!Serial.available()){
    Serial.println(F("Enter any key to begin"));
    screenLoading();
    delay(2000);
   }
}

void loop() {
  if( Serial.available() >0 ){
    String str="";
    while(Serial.available()>0){
      str += char(Serial.read());
    }
    serialInput( str );
    Serial.println();
  }

}

void screenLoading(){
 const uint16_t x = 159;
 const uint16_t y = 149;
 tft.fillScreen(ILI9341_BLACK);
 t1.selectFont(roboto32);
 t1.setFontLetterSpacing(5);
 t1.setFontColor(ILI9341_WHITE, ILI9341_BLACK);
 t1.defineArea(100, 85, 220, 140);
 strcpy(textBuff, "Loading...");
 t1.drawString(textBuff, gTextAlignTopCenter, 0, 0);
 tft.drawArc(x, y, 10, 5, 0, 360, colorLightGray);

 for(int i=0; i<2880; i+=4){
  tft.drawArc(x, y, 10, 5, (i >> 1)-45, (i >> 1)+45, colorDarkGray);
  tft.drawArc(x, y, 10, 5, (i >> 1)-45-4, (i >> 1)-45, colorLightGray);
  tft.drawArc(x, y, 20, 5, 1440-i-45, 1440-i+45, colorDarkGray);
  tft.drawArc(x, y, 20, 5, 1440-i+45, 1440-i+45+4, colorLightGray);
 }
}
void serialInput( String str ){
 int command      = getCommandAsInt( str );
 String variables = getDataAsString( str );
 
 switch( command ){
  case 321: // clr=321
   clrScreen( variables );
   break;
  case 310: // clr=321
   arc( variables );
   break;
  case 843: // clr=321
   getColorData( variables );
   break;
  default:
   Serial.println( command );
 }
}

String getDataAsString( String str ){
 int myStart = str.indexOf('(');
 int myEnd = str.indexOf(')');
 if(myStart==-1)
 return "";
 return str.substring( myStart+1 , myEnd  );
}

int getCommandAsInt( String str ){
  // convert a String value to a int ie abc a+b+c
 int endCommandLetter = str.indexOf('(');
 int stringValue=0;
 if(endCommandLetter==-1)
  endCommandLetter=str.length();
 for(int i=0;i<endCommandLetter;i++){
  stringValue+=str.charAt(i);
 }
 return stringValue;
}
int getDataCount( String str ){

 String strTemp = str.substring( str.indexOf('(')+1 , str.indexOf(')') );

 return findOutHowManyCharInAString( strTemp , ',' );
}

int findOutHowManyCharInAString(String str, char findChar){
  int positionChar = 0, count=0;
  while(positionChar != -1){
   positionChar = str.indexOf( findChar , positionChar+1 );
   if(positionChar!=-1)
    count++;
  }
  return count;
}
int stringToInt(String thisString) {
  int i, value, length;
 
  length = thisString.length();
 
  char blah[(length+1)];
 
  for(i=0; i<length; i++) {
    blah[i] = thisString.charAt(i);
  }
  blah[i]=0;
 
  value = atoi(blah);
 
  return value;
}
void setCharTemp( String str ){
  String strTemp = str.substring( str.indexOf('(')+1 , str.indexOf(')') );
  strTemp.toCharArray( textBuff , 20 );
}

int getIntData( String str ){
 int value = stringToInt( str.substring( str.indexOf('(')+1 , str.indexOf(')') ));
 
 if(value==0)
  return myDelay;
 else
  return value;
}

String getStringData( String str ){
 int myStart = str.indexOf('(');
 int myEnd = str.indexOf(')');
 return str.substring( myStart+1 , myEnd  );
}
void clrScreen( String str ){
 if(str.length()>0){
  boolean isColor = getColorData( str );
  uint16_t myColor  = tft.color565(color[0],color[1],color[2]);
  tft.fillScreen( myColor );
 }
 else
  Serial.println("clr(r,g,b) ie clr( 255 , 255 , 255 ) ");
 
 

}

boolean getColorData( String str ){
 int myLength = str.length();
 if(myLength>0){
  color[0] = stringToInt( str.substring(0 , str.indexOf( ',' )));
  color[1] = stringToInt( str.substring(str.indexOf( ',' )+1 , str.lastIndexOf( ',' )));
  color[2] = stringToInt( str.substring(str.lastIndexOf( ',' )+1 , myLength ));
 }
 else
  return 0;
}
void arc(String str){
  Serial.println( str );
  Serial.println(findOutHowManyCharInAString( str , ',' )+1);
  int x=stringToInt( str.substring( 0 , str.indexOf(',')));
  str = str.substring( str.indexOf(',')+1 , str.length() );
  int y=stringToInt( str.substring( 0 , str.indexOf(',')));
  str = str.substring( str.indexOf(',')+1 , str.length() );
  int sizeC=stringToInt( str.substring( 0 , str.indexOf(',')));
  str = str.substring( str.indexOf(',')+1 , str.length() );
  int thickness=stringToInt( str.substring( 0 , str.indexOf(',')));
  str = str.substring( str.indexOf(',')+1 , str.length() );
  int startC=stringToInt( str.substring( 0 , str.indexOf(',')));
  str = str.substring( str.indexOf(',')+1 , str.length() );
  int endC=stringToInt( str.substring( 0 , str.indexOf(',')));
  str = str.substring( str.indexOf(',')+1 , str.length() );
  Serial.println( str );
 
 
 uint16_t myColor  = tft.color565(color[0],color[1],color[2]);
 tft.drawArc(x, y, sizeC, thickness, startC, endC, myColor);
}