Hi,

Confirmed it's incorrect, forgot to set back to DDRAM after write.

Same code as an example but converted for nrf52.

  uint8_t *c = &characters[0];
  uint8_t x = 0;
  while (c < (&characters[0] + sizeof(characters))) {
    i = 0;
    dmaBuffer.transfer[i++] = INSTRUCTION_COMMAND;
    dmaBuffer.transfer[i++] = COMMAND_ADDRESS_CGRAM | x << 3;
    txWait(i);
    for(uint8_t j = 0; j < 8; j++) {
      i = 0;
      dmaBuffer.transfer[i++] = INSTRUCTION_DATA;
      dmaBuffer.transfer[i++] = *c;
      c++;
      txWait(i);
    }
    i = 0;
    dmaBuffer.transfer[i++] = INSTRUCTION_COMMAND;
    dmaBuffer.transfer[i++] = COMMAND_ADDRESS_DDRAM;
    txWait(i);
    x++;
  }

My problem is the different display. I send the 'A' character but the screen display a different character.

https://user-images.githubusercontent.com/82180410/144410730-f5acc5c5-42fa-4d0d-904e-9cbfc9473a46.jpeg

Hi.
Have you thought about adding so that it is possible and choose if you want to show different number of lines with different height of text (Double Height)?
Ex.
1 row of standard height
1 row of standard height
1 row of double height

as showed in "https://www.lcd-module.de/fileadmin/eng/pdf/zubehoer/ssd1803a_2_0.pdf" page 44

This library is working very well.
Thanks for all your work.

Hello Firexx,
I am trying to use the library you wrote with 16x4 character displays (EA DOGS164N-A, https://www.mouser.fr/datasheet/2/127/dogs164e-1532335.pdf ), since they use the same SSD1803A controller as your MIDAS display.
For now, I can't make it work. My poor skills in writing or editing libraries don't allow me to find the cause of the problem. I can only set the contrast, but text won't print on the display.
Could you help me please ?
Thank you a lot for your work and time.
Julien.