I am working on a new product which includes an RA8875 7" LCD with capacitive touch from BuyDisplay (ER0TFTM070-5) on the front side and mounts a Teensy 4.1, adapter boards and various I/O on the back side.
I am using the RA8875 library that comes with Teensyduino. The LCD is on SPI1 and touch is on the default I2C (pins 18/19).
While testing the hardware, I found that the touchscreen works for single touches or multiple finger touches and also works with multiple finger gestures like using two fingers to zoom in/out. Single finger gestures like swipe up/down/left/right however just return 0.
Seems like a possible library issue? Wondering if anyone can confirm or deny? I tried going through the library, but it's above my software pay grade.
The simplist test case is to just run the RA8875/_CapacitiveTouchScreen/FT5206_gesture.ino example. In my case, I am running it on SPI1, so complete code below:
I am using the RA8875 library that comes with Teensyduino. The LCD is on SPI1 and touch is on the default I2C (pins 18/19).
While testing the hardware, I found that the touchscreen works for single touches or multiple finger touches and also works with multiple finger gestures like using two fingers to zoom in/out. Single finger gestures like swipe up/down/left/right however just return 0.
Seems like a possible library issue? Wondering if anyone can confirm or deny? I tried going through the library, but it's above my software pay grade.
The simplist test case is to just run the RA8875/_CapacitiveTouchScreen/FT5206_gesture.ino example. In my case, I am running it on SPI1, so complete code below:
Code:
```cpp
/*
Demonstrate FT5206 gesture ID's
Works in all orientations
one finger swipe -> up, down ,left, right
two finger pinch -> zoom in, zoom out
three finger tap -> change screen rotation
*/
#include <SPI.h>
#include <RA8875.h>
/*
Teensy3.x and Arduino's
You are using 4 wire SPI here, so:
MOSI: 11//Teensy3.x
MISO: 12//Teensy3.x
SCK: 13//Teensy3.x
the rest of pin below:
*/
const int RA8875_MISO = 39;
const int RA8875_MOSI = 26;
const int RA8875_SCLK = 27;
const int RA8875_CS = 5;
const int RA8875_RESET = 9;
const int RA8875_INT = 2;
#define MAXTOUCHLIMIT 3 //1...5
RA8875 tft = RA8875(RA8875_CS, RA8875_RESET, RA8875_MOSI, RA8875_SCLK, RA8875_MISO);
void setup(){
// begin display: Choose from: RA8875_480x272, RA8875_800x480, RA8875_800x480ALT, Adafruit_480x272, Adafruit_800x480
tft.begin(RA8875_800x480);
tft.setRotation(0);
#if defined(USE_FT5206_TOUCH)
tft.useCapINT(RA8875_INT);
tft.setTouchLimit(MAXTOUCHLIMIT);
tft.enableCapISR(true);
tft.setTextColor(RA8875_WHITE,RA8875_BLACK);
printHeader();
#else
tft.print("you should open RA8875UserSettings.h file and uncomment USE_FT5206_TOUCH!");
#endif
}
void loop(){
#if defined(USE_FT5206_TOUCH)
static uint8_t rot = 0;
static uint8_t prev_touches = 0;
if (tft.touched()){
tft.updateTS();
if(tft.getTouches() == 3 && prev_touches < 3){
if(++rot > 3) rot = 0;
tft.setRotation(rot);
printHeader();
}else{
uint8_t gesture = tft.getGesture();
tft.setFontScale(1);
switch (gesture) {
case 0x10: //up
tft.setCursor(CENTER,CENTER);
tft.print("UP ");
break;
case 0x14: //left
tft.setCursor(CENTER,CENTER);
tft.print("LEFT ");
break;
case 0x18: //down
tft.setCursor(CENTER,CENTER);
tft.print("DOWN ");
break;
case 0x1C: //right
tft.setCursor(CENTER,CENTER);
tft.print("RIGHT ");
break;
case 0x48: //zoom in
tft.setCursor(CENTER,CENTER);
tft.print("ZOOM IN ");
break;
case 0x49: //zoom out
tft.setCursor(CENTER,CENTER);
tft.print("ZOOM OUT");
break;
}
}
prev_touches = tft.getTouches();
}
#endif
}
void printHeader(){
tft.fillWindow(RA8875_BLACK);
tft.setFontScale(0);
tft.setCursor(0, 0);
tft.print("Swipe or Pinch.");
tft.setCursor(0, 25);
tft.print("Tap 3 fingers to rotate.");
}
```
