White screen issue with samd21

[wajdib]

Description

Using the example provided, I get white screen shortly after calling if (ts.touched()) on samd21 based boards(feather m0, arduino zero...)

Steps To Reproduce Problem

run the example code.

Hardware & Software

Board :feather m0

[PaulStoffregen]

Which example?

This library comes with 3 examples. 2 of them do not control a display at all. 1 does, and the library it uses to do so is not compatible with those boards.

[wajdib]

Touch test example.
My project already has TFT9341 library installed for graphics, once I add the following to my Loop function the screen goes all white:
if (ts.touched()) { }

It seems that the library touched() function, which has an Update() function, its SPI calls interfere with the display and render it white.

[PaulStoffregen]

Are you going to show the complete code to reproduce this problem?

[wajdib]

Here is a complete to reproduce the problem:
`
#include <SPI.h>
#include <TFT9341.h>

#include "wiring_private.h"
#include "XPT2046_Touchscreen.h"

XPT2046_Touchscreen ts(12, 10);

#if defined(ARDUINO_SAMD_ZERO) && defined(SERIAL_PORT_USBVIRTUAL)
// Required for Serial on Zero based boards
#define Serial SERIAL_PORT_USBVIRTUAL
#endif
//#endif
#define display Tft

void setup() {

ts.begin();
Serial.begin(115200);

display.InitLCD(3);
//set background color
display.fillScr(0, 255, 0);
//display.clrScr();

}

float speed = 0;
int OldOnes = 0;
int OldTens = 0;
extern uint8_t SevenSeg_XXXL_Num[];
void loop() {

//If ts.touched() is commented out, you will see the counter properly updating on the screen,
//if ts.touched() is uncommented, nothing will be displayed.
if (ts.touched()) {
}

delay(1000);
speed++;

display.setBackColor(0x0000);
display.setColor(0xFFFF);
display.setFont(SevenSeg_XXXL_Num);

int ones = (int)speed % 10;
int tens = (int)speed / 10 % 10;

if (OldOnes != ones )
{
display.setColor(0xFFFF);
OldOnes = ones;
String sOnes = String(ones);
if (ones == 0)
sOnes = "0";
display.print(sOnes, 155, 70);
}
if (OldTens != tens )
{
display.setColor(0xFFFF);
OldTens = tens;
String sTens = String(tens);
if (tens == 0)
sTens = "0";
display.print(sTens, 95, 70);
}

}`

[wajdib]

TFT9341 library Im using is this one https://github.com/pantata/TFT9341SPI