PIC32 and NHD-C0220BIZ-FSW-FBW-3V3M problem

fidodido18

• September 08, 2014 09:07

Hello Newhaven Developers,

Sometimes the COG does not show anything on the screen, and my microcontroller show me a NACK reception of the LCD.
Please how to prevent this problem?

My system:
1. Microcontroller: PIC32MX795F512L
2. LCD: NHD-C0220BIZ-FSW-FBW-3V3M

I have 500 LCD in stock for this project. 

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  Michael_L

  • September 08, 2014 10:07

  What speed are you running your I2C bus at?  Also, what value pull-up resistors are you using?

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  fidodido18

  • September 12, 2014 10:07

  Hello Michael L,
  
  thank you for you help.
  
  I have connected my LCD with extension cable (9 in).
  
  I have 4.7 Kohm pull up resistors. And the i2c bus frecuncy is 200 khz.

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  Michael_L

  • September 12, 2014 11:07

  Thank you for the  information.  Can you please try using 10kΩ pull-ups just to test for the ACKs?  Also, is it possible to try slowing down your I2C speed to 100kHz?  I just want to see if this results in any differences for you.

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  fidodido18

  • September 19, 2014 11:07

  Hello Michael,
  
  thank you for your help.
  
  I have hardware problems with the RESET PIN. I changes the Microcontroller pin direction and change the pull up resistor and I2C speed and now all is OK.
  
  
  thank you very much.

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