#UPDATE 1:

UPDATE 1:

I have bought a 2.5" TFT shield online which is equipped with the ILI9341 controller and I need to dim the intensity of the background LEDs to match ambient light.

This particular shield does not provide a pin to control the intensity of the LEDs with PWM via a separate input so I need to dim the background LEDs of this display via software.

The zip file with the libraries can be downloaded: here

Does one of you know how can issue a command to the TFT display to dim the background LED's?

UPDATE 1:

I wrote a new function to set the displya brightness by controlling the background LEDs, but something is missing as I can seem to be writing correctly to the display. So I'm trying to get the display to answer to a known command first, like 0x28 (Display Off).

// Set display brightness (background LED's)
void Adafruit_TFTLCD::setDisplayBrightness(uint8_t x) {
 // Try with 0x28 (Display Off) to see if display reacts
 writeRegister8(0x28, 0);
return;
}

// New functions
void setDisplayBrightness(uint8_t x);

void Adafruit_TFTLCD::begin(uint16_t id) {
...
writeRegister8(ILI9341_DISPLAYON, 0); 
delay(500);
writeRegister8(0x51, 0x80); // Test command 0x51 - background intensity
delay(500);

void Adafruit_TFTLCD::begin(uint16_t id) {
...
writeRegister8(ILI9341_DISPLAYON, 0);
writeRegister8(0xbe, 0x80); delay(500);
writeRegister8(0x51, 0x0); delay(500);

Also if I issue the 0x28

elsewhere in Adafruit_TFTLCD (e.g. in FillScreen, Fill Rect etc, it doesn work either).

I have bought a 2.5" TFT shield online, which is equipped with the ILI9341 controller. I need to dim the intensity of the background LEDs to match ambient light.

This particular shield does not provide a pin to control the intensity of the LEDs with PWM via a separate input, so I need to dim the background LEDs of this display via software.

The zip file with the libraries can be downloaded here .

Does one of you know how can issue a command to the TFT display to dim the background LEDs?

#UPDATE 1:

I wrote a new function to set the display's brightness by controlling the background LEDs, but something is missing as I can seem to be writing correctly to the display. So I'm trying to get the display to answer to a known command first, like 0x28 (Display Off).

// Set display brightness (background LED's)
void Adafruit_TFTLCD::setDisplayBrightness(uint8_t x) {
 // Try with 0x28 (Display Off) to see if display reacts
 writeRegister8(0x28, 0);
return;
}

// New functions
void setDisplayBrightness(uint8_t x);

void Adafruit_TFTLCD::begin(uint16_t id) {
...
writeRegister8(ILI9341_DISPLAYON, 0); 
delay(500);
writeRegister8(0x51, 0x80); // Test command 0x51 - background intensity
delay(500);

void Adafruit_TFTLCD::begin(uint16_t id) {
...
writeRegister8(ILI9341_DISPLAYON, 0);
writeRegister8(0xbe, 0x80); delay(500);
writeRegister8(0x51, 0x0); delay(500);

Also if I issue the 0x28 command:

elsewhere in Adafruit_TFTLCD (e.g. in FillScreen, Fill Rect etc, it doesn't work either).

Any ideas? They would be highly appreciated !

Also if I issue the 0x28

writeRegister8(ILI9341_DISPLAYOFF, 0)

elsewhere in Adafruit_TFTLCD (e.g. in FillScreen, Fill Rect etc, it doesn work either).

Any ideas? They would be highly appreciated !