Great work. On the Example i just get the Error, that the Touchscreen couldn't get started. But it works perfectly on the 7" Capacitive Display with Arduino Mega Shield from buydisplay

Hi, I just bought the Adafruit 2.8" TFT Touch Shield v2 with capacitive sensor (product ID: 1947). The learn.adafruit.com page on this shield mentions the CapTouchPaint.ino example as a way of testing out the screen's touch. I found it works, however, the X-axis is inverted. For my case, this was fixed by changing

p.x = map(p.x, 0, 240, 240, 0);

to

p.x = map(p.x, 240, 0, 0, 240);

Perhaps a bug (with this specific shield)?

• Arduino board: WT32-SCO1 with ESP32

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.19

LIST REPRO STEPS BELOW

If i give the SDA & SCL pins as parameters in the begin function, it does not work.
If ihard code these pins in the library Adafruit_FT6206.cpp then i works.

I use the example sketches:\

where is says

if (!ts.begin(40)) { 
    Serial.println("Unable to start touchscreen.");
  } 
  else { 
    Serial.println("Touchscreen started."); 
  }

But from the library I read that i can also use SDA,SCL and TRESHOLD so i tried

f (!ts.begin(18,19, 40)) { 
    Serial.println("Unable to start touchscreen.");
  } 
  else { 
    Serial.println("Touchscreen started."); 
  }

This, however, does not work...
This is how i solved it for the moment in Adafruit_FT6206.cpp

boolean Adafruit_FT6206::begin(uint8_t sda, uint8_t scl, uint8_t thresh) {
  if (sda == 0 && scl == 0) {
    Wire.begin();
  } else {
    Wire.begin(sda, scl);
      
      // not working with variables sda and scl, but if change with hardcoded
      // pins works -> Wire.begin(18, 19); then it works perfectly.
  }

https://github.com/adafruit/Adafruit_BusIO

Hello, @ladyada. I'm wondering why do you make all methods in the classes you implement private, not protected?

Doing so makes it hard to inherit from your classes's code and implement some specific behavior.

We are using some of your libraries in our project and in each library we have to deal with exactly the same issue - private methods. So we have to fork your lib, edit private-protected, inherit class to add our own logic

Thanks for sharing.
I wonder if this lib can run in ESP32.

In two places there is a Wire.endTransmission after a Wire.requestFrom. However, the Wire.endTransmission is only for transmitting data, and the Wire.requestFrom starts and stops a complete I2C transmission on its own.

Context

• Arduino board: UNO
• TFT Screen ER-TFTM028-4 V4.0
• Arduino IDE version: Arduino 1.8.9 (Windows Store 1.8.21.0)

Hi, I used with my UNO card with an TFT screen ER-TFTM028-4. The GFX work well with demo example. But when I try demo of capacitve touch screen, I've compilation error.

C:\Users\paul_\Documents\Arduino\libraries\Adafruit_GFX_Library\Adafruit_SPITFT.cpp: In member function 'writeFastVLine':
C:\Users\paul_\Documents\Arduino\libraries\Adafruit_GFX_Library\Adafruit_SPITFT.cpp:1318:1: internal compiler error: Segmentation fault

}

^

Please submit a full bug report,

with preprocessed source if appropriate.

See http://gcc.gnu.org/bugs.html for instructions.

lto-wrapper.exe: fatal error: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.21.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-gcc returned 1 exit status

compilation terminated.

c:/program files/windowsapps/arduinollc.arduinoide_1.8.21.0_x86__mdqgnx93n4wtt/hardware/tools/avr/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/ld.exe: error: lto-wrapper failed

collect2.exe: error: ld returned 1 exit status

exit status 1
Erreur de compilation pour la carte Arduino/Genuino Uno

What's the problem ??
Thank in advance for you help,

Paul.

Hi,

Would this library work with FT6336G? it is basically a newer version of the FR6206. Thanks!

https://learn.adafruit.com/adafruit-qualia-esp32-s3-for-rgb666-displays/arduino-touch-display-usage
Also https://learn.adafruit.com/adafruit-qualia-esp32-s3-for-rgb666-displays/arduino-rainbow-demo

Code example used:

#include <Wire.h>      // this is needed for FT6206
#include <Adafruit_FT6206.h>

#define I2C_TOUCH_ADDR 0x48  // often but not always 0x48!
Adafruit_FT6206 ctp = Adafruit_FT6206();  // this library also supports FT5336U!

Serial.begin(115200);  // To print the output

if (!ctp.begin(0, &Wire, I2C_TOUCH_ADDR)) {
    Serial.println("No touchscreen found");
}