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2
TFTs / FT5x06 sensitivity
« Last post by Chris R on March 20, 2019, 12:08:04 PM »
Hi,

What is the procedure to adjust increase the sensitivity of 7" CTP ?
I know that i have to write values to Address 80h and 81h, but who this values are calculated ?

Thanks in advance for your help.
3
Character LCDs / Re: NHD-C0220BiZ-FS(RGB)-FBW-3VM I2C Help
« Last post by Ted_M on March 20, 2019, 08:51:39 AM »
Hi kharding,

Please check and confirm the "L" level input is less than 0.8V and the "H" level input is more than 2.31V to be withing the specification. 
It may also be good to check the noise level on the source waveform using a scope as this may affect the logic level transitions.

Best Regards,
4
Character LCDs / Re: anode voltage and resistor for NHD-C0220AZ-FSW-FTW
« Last post by Ted_M on March 20, 2019, 08:40:59 AM »
Hi Itsmit,

The LED can be driven with a 5V source voltage when a 66.66 ohm resistor is added externally.  This will limit the LED current to 30mA and the LED voltage drop will be 3.0V.

This online LED current limiting Resistor Calculator can be very useful.  http://www.ohmslawcalculator.com/led-resistor-calculator

Best Regards,
5
Character LCDs / anode voltage and resistor for NHD-C0220AZ-FSW-FTW
« Last post by ltsmit on March 19, 2019, 06:48:04 PM »
The character display NHD-C0220AZ-FSW-FTW is 5 Volt, but specs says for Backlight Anode: 30 mA @ 3V.

Is the resistor included in de display (so: 3V / 0.030 A = 100 ohm)?

Can the Anode be driven with 5 Volt if a 66.66 ohm resistor is added externally? So, total resistance is then 166.66 ohm (and 166.66 ohm * 0.030 A = 5V), if 100 ohm is included in display.

Thanks.
6
Character LCDs / NHD-C0220BiZ-FS(RGB)-FBW-3VM I2C Help
« Last post by kharding on March 18, 2019, 03:13:58 PM »
Hello all,

I am using a NHD-C0220BiZ-FS(RGB)-FBW-3VM with I2C functionality. I have been able to get this LCD working before but now I am having troubles with SDA and SCK. I have tried multiple different resistances and multiple addresses. I am using the address of 0b01111000 (0x78) and have tried multiple resistances on the pull up lines. If the resistance is too high, the SDA and SCK lines will drop to 1.5V. If the resistance is about 1K the lines are able to send data from my controller, but I believe the LCD cannot pull the line low to acknowledge the command. It seems like the LCD is drawing a lot of current on the SDA and SCL lines. Is this a thing?

Thanks in advance!
7
Character LCDs / Re: NHD-C0220BiZ-FSW-FBW-3V3M stucking at "39"
« Last post by amitjagtap on March 18, 2019, 05:35:11 AM »
Pin 6 Voltage is 2.94V.
8
Character LCDs / Re: Weird contrast on NHD-0216HZ-FSW-FBW-33V3C?
« Last post by manymaniyaa on March 18, 2019, 03:08:23 AM »
Ok, so I had to pull the microcontroller and LCD into a new setup to match the wiring of your code.

The code compiled/loaded up just fine and to my surprise, the contrast returned! 😊 PhenQ | https://phenq-reviews.com

After things were back working again I decided to test my code+setup to see if it’s the culprit -  I transferred both the LCD and Microcontroller back onto my original setup and re-flashed with my old code. The contrast was perfect there too!

Now I’m left wondering - why?

Might it have been something about the ISP programmer being disconnected that messed up some register on the LCD so that it misbehaved from that point forward?

Maybe a partial message during power interruption left the unit in a weird state? could it have been toggling the “busy” flag from the last power cycle, but my code kept pushing data?

Perhaps your code initializes the LCD differently than the Library(details below) I’m using to run the LCD ? Such that it more-effectively reset the issue I was seeing?

Did I do some ESD to the device? PhenQ | https://phenq-reviews.com

Here is some more info on the setup, in case you’ve got any other ideas:
1. I’m using an Arduino Pro Mini as my 3.3V Microcontroller
2. Pinout on the LCD/Microcontroller is:
     LCD-1 = GND
     LCD-2 = +3.3v
     LCD-3 = NC
     LCD-4 = ARDUINO 7/PD7
     LCD-5 = GND
     LCD-6 = ARDUINO 6/PD6
     LCD-7 = NC
     LCD-8 = NC
     LCD-9 = NC
     LCD-10 = NC
     LCD-11 = ARDUINO 2/PD2
     LCD-12 = ARDUINO 3/PD3
     LCD-13 = ARDUINO 4/PD4
     LCD-14 = ARDUINO 5/PD5
     LCD-15 = +3.3V
     LCD-16 = 50 ohm resistor to ARDUINO 8/PB0, toggled low in software (MCU sinks backlight current)
3. Using Arduino’s “LiquidCrystal” library with the following initialization:
     “LiquidCrystal lcd(7, 6, 2, 3, 4, 5);”

All of these are naturally come back with the font
9
Character LCDs / NHD-C0220BiZ-FSW-FBW-3V3M stucking at "39"
« Last post by amitjagtap on March 18, 2019, 12:13:46 AM »
Sir,
We are using NHD-C0220BiZ-FSW-FBW-3V3M LCD. We write I2C code using bit banging.
We are not getting ACK for "0x39" command....
Kindly help out to resolve this issue.
ALSO let us know what I2C slave address we should use...as I have seen in forum  post "3C" used instead of "78".

This is our code....
void LCD_GPIO_INIT()
{
    gpio_pin_config_t LCD_I2C_SCL_config = {
        kGPIO_DigitalOutput, 1,
    };
    gpio_pin_config_t LCD_I2C_SDA_config = {
        kGPIO_DigitalOutput, 1,
    };

    gpio_pin_config_t LCD_THERMAL_SD_config = {
        kGPIO_DigitalOutput, 1,
    };

    /*Init TX_EN High*/
    GPIO_PinInit(GPIOC, 10, &LCD_I2C_SCL_config);
 
    /*Init RX_EN Low*/
    GPIO_PinInit(GPIOC, 11, &LCD_I2C_SDA_config);
   GPIO_PinInit(GPIOA, 26, &LCD_THERMAL_SD_config);

}

/****************************************************
* I2C Start *
*****************************************************/
void I2C_Start(void)
{
//SCL=1;
//SDA=1;
//SDA=0;
//SCL=0;
  GPIO_PinWrite(GPIOC, 10,1);
  GPIO_PinWrite(GPIOC, 11,1);
  GPIO_PinWrite(GPIOC, 11,0);
  GPIO_PinWrite(GPIOC, 10,0);


}
/*****************************************************/
/****************************************************
* I2C Stop *
*****************************************************/
void I2C_Stop(void)
{
//SDA=0;
//SCL=0;
//SCL=1;
//SDA=1;

  GPIO_PinWrite(GPIOC, 11,0);
  GPIO_PinWrite(GPIOC, 10,0);
  GPIO_PinWrite(GPIOC, 10,1);
  GPIO_PinWrite(GPIOC, 11,1);
}




/****************************************************
* Output command or data via I2C *
*****************************************************/
void I2C_out(unsigned char j) //I2C Output
{
  int n;
      gpio_pin_config_t LCD_I2C_SDA_config_out = {
        kGPIO_DigitalOutput, 1,
    };
         gpio_pin_config_t LCD_I2C_SDA_config_in = {
        kGPIO_DigitalInput, 1,
    };

  uint8_t d;
  d=j;
  for(n=0;n<8;n++)
  {
    if((d&0x80)==0x80)
      GPIO_PinWrite(GPIOC, 11,1);//SDA=1;
    else
      GPIO_PinWrite(GPIOC, 11,0); //SDA=0;
    d=(d<<1);
    cdelay();
    GPIO_PinWrite(GPIOC, 10,0); //SCL = 0;
    cdelay();
    GPIO_PinWrite(GPIOC, 10,1); //SCL = 1;
    cdelay();
    GPIO_PinWrite(GPIOC, 10,0); //SCL = 0;
  }
 cdelay();
  GPIO_PinWrite(GPIOC, 10,1);//SCL = 1;
   GPIO_PinInit(GPIOC, 11, &LCD_I2C_SDA_config_in);
 
cdelay();
 while(GPIO_PinRead(GPIOC,11) == 1)// while(SDA==1)
  {
    GPIO_PinWrite(GPIOC, 10,0); //SCL=0;
      cdelay();
    GPIO_PinWrite(GPIOC, 10,1); //SCL=1;
      cdelay();
  }
    GPIO_PinInit(GPIOC, 11, &LCD_I2C_SDA_config_out);

 GPIO_PinWrite(GPIOC, 10,0); //SCL=0;
 cdelay();
}



/****************************************************
* Initialization For ST7036i *
*****************************************************/
void init_LCD()
{
  I2C_Start();
  I2C_out(Slave);//Slave=0x78
  I2C_out(Comsend);//Comsend = 0x00
  I2C_out(0x38);
  delay(10);
  delay(10);
  I2C_out(0x39);
  delay(10);
  delay(10);
  I2C_out(0x14);
  I2C_out(0x78);
  I2C_out(0x5E);
  I2C_out(0x6D);
  I2C_out(0x0C);
  I2C_out(0x01);
  I2C_out(0x06);
  delay(10);
  I2C_Stop();
}

/****************************************************
* Send string of ASCII data to LCD *
*****************************************************/
void Show(unsigned char *text)
{
  int n,d;
  d=0x00;
  I2C_Start();
  I2C_out(Slave); //Slave=0x78
  I2C_out(Datasend);//Datasend=0x40
  for(n=0;n<20;n++){
  I2C_out(*text);
  ++text;
  }
  I2C_Stop();
}

int lcd_test()
{
  uint8_t data[]={0x41, 0x42, 0x43, 0x44};
  LCD_GPIO_INIT();
  init_LCD();
  Show(data);
}
10
TFTs / Re: Touch not working on NHD-5.0-800480TF-ATXL#_Rev1B
« Last post by Ted_M on March 15, 2019, 09:16:14 AM »
Hi Jeff,

The capacitive touchscreens used on the Rev1B version of the 5" TFT's are now using a new version of the Focaltech touch controler IC.

The FT5406 capacitive touch controller has reached end of life and was replaced by the FT5426 for new production touchscreens used on the Rev1B 5" TFTs.  The new controller has proven to be backwards compatible with existing systems based on internal testing.

Please review the datasheets for each controller for details.

FT5406 datasheet: http://www.newhavendisplay.com/appnotes/datasheets/touchpanel/FT5x06.pdf
FT5406 App Notes: https://www.newhavendisplay.com/appnotes/datasheets/touchpanel/FT5x06_registers.pdf

FT5426 datasheet: http://www.newhavendisplay.com/appnotes/datasheets/touchpanel/FT5x26.pdf
FT5426 App Notes:  https://www.newhavendisplay.com/appnotes/datasheets/touchpanel/FT5426_5526Application_Note_Ver0.1.pdf

Also, the Touch Panel's FPC has been redesigned to make it less susceptible to tearing and other damage from handling or assembly.

Please contact us at nhtech@newhavendisplay.com for additional support with this issue.

Bert Regards,
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