NHD‐0420CW‐AB3 I2C Interface

andersonpd

• January 22, 2015 16:13

I don't understand exactly how to send data and/or control bytes to the NHD-0420CW-AB3 display (US2066 driver).

Please verify if this is correct. In each case the start condition and slave address have been sent to the display.

1. To send data only: Send a control byte with both Co and D/C# set to zero (0x00). Any subsequent bytes will be interpreted as data.

2. To send a command: Send a control byte with Co set to one and D/C# set to zero (0x80). The following byte will be interpreted as a command. Repeat for each command (i.e. always send both a control and a command byte).

3. Alternatively, data can also be sent by sending a control byte with Co set to one and D/C# set to one (0xC0). The following byte will be interpreted as data. Repeat for each data byte (i.e. always send both a control and a data byte).

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• 

  Michael_L

  • January 23, 2015 10:05

  Perhaps the below code snippets will better assist you:

  const char slave2w = 0x3C;
  
  void send_packet(unsigned char x)
  {
    unsigned char ix;
   
    Wire.beginTransmission(slave2w);
    for(ix=0;ix<x;ix++)
    {
      Wire.write(tx_packet[ix]);
    }
    Wire.endTransmission();
  }
  
  void command(unsigned char c)
  {
        tx_packet[0] = 0x00;
        tx_packet[1] = c;
        send_packet(2);
  }
  
  void data(unsigned char d)
  {
        tx_packet[0] = 0x40;
        tx_packet[1] = d;
        send_packet(2);
  }

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