UTFT few display connection

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1

Hello. I need connect 2 spi displays to arduino. Im using UTFT library. I need somehow select screen for printing information.

2

Give each screen a different Slave Select pin and select the required screen before writing to it

3

Im trying, but i don't know how to select screen in script. i'm not bound to UTFT library, but i found nothing about screen selection in google.

4

Read How to get the best out of this forum

Follow the advice and post your complete sketch using code tags

5

I have no code. Becouse i don't understand how to select the screen. that's why im here

6

Find an example that uses one screen and get that working then post the working code here asking for advice on adding a second screen. Do not start a new topic for the question

7

Ok, here it is.

#include <UTFT.h>      
#define SDI 11 
#define SCK 13 
#define CS 10
#define RESET 7 
#define DC  8 
UTFT s1(ILI9341_S5P,SDI,SCK,CS,RESET,DC); 

void setup(){ 
 s1.InitLCD(); }
byte space = 2;
void loop(){  
s1.setColor(VGA_WHITE);
for (int i = 0; i<5; i++)
              {
               s1.drawCircle(160,120,90-i*space); 
              }
              s1.setColor(VGA_BLACK);

             for (int i = 0; i<5; i++)
              {
               s1.drawCircle(160,120,90-i*space);
              }
}
8 
UTFT s1(ILI9341_S5P,SDI,SCK,CS,RESET,DC);

The value of CS in that statement sets the address of the display. If you were to do

#include <UTFT.h>      
#define SDI 11 
#define SCK 13 
#define CS1 10
#define CS1 4
#define RESET 7 
#define DC  8 
UTFT s1(ILI9341_S5P,SDI,SCK,CS1,RESET,DC);
UTFT s2(ILI9341_S5P,SDI,SCK,CS2,RESET,DC);

then you could print to either screen s1 or screen s2 independently if you connect the CS pin of screen 2 to pin 4 or another otherwise unused pin

9

nope, in this case, they are not working at all.
upd: sometimes it works, but only with last inicialised screen.

i must use :

s1.InitLCD();
s2.InitLCD();

and only last inicialised screen will work.

10

Try giving each screen a different reset pin

11

I tryed. different rst/cs/dc in different combinations. but nothing changed

12

Each screen shares the same SDA and SCL pins and needs its own CS pin but I am not sure about the RST pin. The RS (DC) pin is optional depending on the display being used

Can you please post a link to the screens being used ? I assume the both of them work when used with the single screen sketch

13

It is?

14

POOH !

Did I really post that ?

It should, of course, be

#define CS1 10
#define CS2 4

@classic_fungus take note of the change and try 2 screens again each using different CS pins

15

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