NHD-2.8-25664 OLED Display

riaz

• September 08, 2014 10:57

hi everyone,

I am using an oled in my project but am have great difficulty in getting it to work.

I am using parallel 6800 interface.

I can send command oxA4  and the display goes all blank.
i then send command 0xA5 and display all lit.

i have used the init sequence as per data sheet and i get display showing some pixels while other and un-lit (semi random).

i have noticed,  after sending data (instruction)  the next command instruction is ignored. this leads me to thinks there is problem with my sending data command.

i can't see much difference between command and data instruction except the DC line.

i have  run Checkerboard_25664() and i get nothing.

please help
many thanks

0

• 

  riaz

  • September 08, 2014 11:08

  when i said the screen has some pixels lit (randomly) it actually looks much like The Matrix screen saver.

  0
• 

  Michael_L

  • September 09, 2014 08:48

  Since you said you are sending commands that work, followed by ones that don't, it leads me to believe that your timing is too fast.  Try either slowing down your program speed (easiest way initially) or trying adding delays after your write functions.

  0
• 

  riaz

  • September 10, 2014 05:45

  thanks for your response.
  
  if anything, timings are too slow (in ms) i will speed this up later.
  i have since my previous post, modified my hardware and s/w for test purposes, to 4 wire spi. that works fine. i'm displaying stuff on the screen.
  
  however i would like to use the parallel interface.
  the only thing i can think of it that i have tied RES (high) and CS(low). i am not controlling those pins (lack of i/os at present). could that be the problem?

  0
• 

  Michael_L

  • September 11, 2014 08:05

  Having the RES line pulled HIGH should be ok.  However, you will need to use the CS signal each time you write.  Ex: pull it low before the write cycle, and bring it back high after.

  0
• 

  riaz

  • September 12, 2014 06:39

  i will give that a go, just as soon as i can, and will report back
  
  many thanks

  0

Please sign in to leave a comment.