ssd1289 and ili9341 no SPI

[Dirk]

Hi everybody,
I received two displays from a chinese supplier.
They look like twins, but one is a SSD1289 and the other one is a ili9341 that does not support SPI.
Both displays have similar pins.
The SSD1289 works perfect.
I messed around with some glcd header files, but the ili9341 is not working.

I am stuck, please help

[stan cartwright]

The spi ili9341's I have use 3.3V logic. They power on 5V supply though, you can see the regulator.
A 1.5KR in series to clk,mosi etc with 2k7 to ground works for me.
The original ili9341 include recommended a ca4050 buffer run from 3.3V but it's gone now.

[Dirk]

Hi Stan,

the logic voltage is not an issue, I´m using a LM2575 step down regulator.
Here comes a copy of my working ssd1289 config.
I think we have to modify the ili9341.h

[Anobium]

What version of Great Cow BASIC? This is important as we have upadted the library.

[Dirk]

0.98.00 2017-09-23

and latest includes from trunk

[Anobium]

Advice. Dont update from trunk. The builds are the consistent and we issue patches - I cannot promise that code from trunk works with the release as we are constantly revising.

So, back to question.

Voltages are critical on ILI9341. Meter the voltages - I have one ILI9341 that will only operate at 3.4v.
Also, which chip ? hardware or software ? I2c?

[Dirk]

Hello Anobium,
please have a look at my ssd1289.gcb
It is working !
I need something similar for the ili9341 with no SPI or I2c support

[Anobium]

Do you mean the deivces has no SPI or I2C interface? what is the interface?

[stan cartwright]

I think you have a 8 or 16bit parallel ili9341.
does it look like this?

[Dirk]

Yes that´s right 8 or 16bit parallel and no spi.
any solution ?

[stan cartwright]

There's isn't one unless you can change the ili9341 include to use parallel using the include for ili9481 as a guide.which is a parallel display. Beyond me,sorry.

[Dirk]

Yeah,
the ili9481.h is a good template i have tried earlier but without any success
aren't there any code warriors around with the same problem ?

[Anobium]

You have purchased some odd beasts. These displays are typically sold with I2C or/and SPI.

So you were able to use the SSD1289 as this is already a 16bit bus? Correct?

The ili9341 does not support a 16bit bus. Without a device here for testing this is a huge ask, for anyone. But, conversion of the communication methods should be possible to complete with some ease as the libraries all use common methods.... but the amount of regression testing would take most of the time.

[Dirk]

the hx8374 also looks very suitable

[Anobium]

What is a hx8374?
Can you post the URL to the two you have purchased?
Have you reviewed the GLCDs we support?

[kent_twt4]

I have this ili9341 (8 bit interface) on order for two weeks now from ebay https://www.ebay.com/itm/122631646524 probably another week or two before it arrives.

Considering my complete lack of progress with the hx8347 glcd library, I can only surmise a definite maybe for a 8bit ili9341 library update.

[Anobium]

I can do these libraries - I sort of enjoy it!

I need the hardware/display delivered here. Cus, I am not going to buy them. :-)

[stan cartwright]

Kent..buy from ebay uk and for twice the price it arrives in a week, sent from Leeds or somewhere uk.
The arduino shield version looks plug n play. I got a shield for the one I posted. Too many wires otherwise.
Am I right in thinking the ili9481 would look visually faster than the same code on an ili9341 ? ie is it worth the wiring and no ports left?
Nice if ili9341 touch screen and sd card and reading screen ram ie pixel or row or box area was available. It can be done in c. I have the code but can't get it working in gcb.
The ili9341/9841 includes are complicated in the hardware settings and what write actually does.

[kent_twt4]

@Anobium
I'll wait on the ili9341 8bit and give it a go when it comes in. I'm too cheap to sponser... :) ... will someone sponser me? (just kidding!). I do like learning something new though, from scratch when possible.

@Stan
If the 8 bit library comes together, then the 16 bit is only a minor change to few procedures and initiation. I have no clue at this time on speed difference between the ili9341 and the ili9481, I would expect not a lot, if any? Speed differences on the glcd would mostly come down to I2C, SPI, and parallel interfaces, and clk speed of the micro I would think.

The ili9481 16 bit interface glcd (arduino mega board model) that I mentioned in a previous post does not have a touch screen nor can it perform gram reads as that pin or capability is not brought out to the header.

[stan cartwright]

Is it just change this

sub  SendCommand_ILI9341( IN ILI9341SendByte as byte )

  set ILI9341_CS OFF;
  set ILI9341_DC OFF;

  #ifdef ILI9341_HardwareSPI
     SPITransfer  ILI9341SendByte,  ILI9341TempOut
     set ILI9341_CS ON;
     exit sub
  #endif

  #ifndef ILI9341_HardwareSPI
  repeat 8

    if ILI9341SendByte.7 = ON  then
      set ILI9341_DO ON;
    else
      set ILI9341_DO OFF;
    end if
    SET GLCD_SCK On;
    rotate ILI9341SendByte left
    set GLCD_SCK Off;

  end repeat
  set ILI9341_CS ON;
  #endif

end Sub

'''Send a data byte to the ILI9341 GLCD
'''@param ILI9341SendByte Byte to send
'''@hide
sub  SendData_ILI9341( IN ILI9341SendByte as byte )

  set ILI9341_CS OFF;
  set ILI9341_DC ON;

  #ifdef ILI9341_HardwareSPI
     SPITransfer  ILI9341SendByte,  ILI9341TempOut
     set ILI9341_CS ON;
     exit sub
  #endif

  #ifndef ILI9341_HardwareSPI
  repeat 8

    if ILI9341SendByte.7 = ON then
      set ILI9341_DO ON;
    else
      set ILI9341_DO OFF;
    end if
    SET GLCD_SCK On;
    rotate ILI9341SendByte left
    set GLCD_SCK Off;

  end Repeat
  set ILI9341_CS ON;
  #endif

end Sub

'''Send a data word (16 bits) to the ILI9341 GLCD
'''@param ILI9341SendByte Word to send
'''@hide
Sub SendWord_ILI9341(In ILI9341SendWord As Word)
  set ILI9341_CS OFF;
  set ILI9341_DC ON;

  #ifdef ILI9341_HardwareSPI
     SPITransfer  ILI9341SendWord_H,  ILI9341TempOut
     SPITransfer  ILI9341SendWord,  ILI9341TempOut
     set ILI9341_CS ON;
     exit sub
  #endif

  #ifndef ILI9341_HardwareSPI
  repeat 16

    if ILI9341SendWord.15 = ON then
      set ILI9341_DO ON;
    else
      set ILI9341_DO OFF;
    end if
    SET GLCD_SCK On;
    rotate ILI9341SendWord left
    set GLCD_SCK Off;

  end repeat
  set ILI9341_CS ON;
  #endif
End Sub

to this?

sub  SendCommand_ILI9481( IN ILI9481SendByte as byte )

  #if GLCD_TYPE = GLCD_TYPE_ILI9481

    #ifndef GLCD_ILI9481_16bit
        '  'Set output command
        #ifdef PIC
          ILI9481_GLCD_DB7 = ILI9481SendByte.7
          ILI9481_GLCD_DB6 = ILI9481SendByte.6
          ILI9481_GLCD_DB5 = ILI9481SendByte.5
          ILI9481_GLCD_DB4 = ILI9481SendByte.4
          ILI9481_GLCD_DB3 = ILI9481SendByte.3
          ILI9481_GLCD_DB2 = ILI9481SendByte.2
          ILI9481_GLCD_DB1 = ILI9481SendByte.1
          ILI9481_GLCD_DB0 = ILI9481SendByte.0
        #endif
        #ifdef AVR
        PORTD = (PORTD & 0B00000011) | ((ILI9481SendByte) & 0B11111100);
        PORTB = (PORTB & 0B11111100) | ((ILI9481SendByte) & 0B00000011);
        #endif

          set ILI9481_GLCD_RS OFF
          set ILI9481_GLCD_WR OFF
          set ILI9481_GLCD_WR ON
          set ILI9481_GLCD_RS ON

    #endif

    #ifdef GLCD_ILI9481_16bit
      Set ILI9481_GLCD_CS Off
      set ILI9481_GLCD_RS OFF

      ILI9481_DataPortH = 0
      ILI9481_DataPortL = ILI9481SendByte

      'set ILI9481_GLCD_RS OFF
      set ILI9481_GLCD_WR OFF
      set ILI9481_GLCD_WR ON
      set ILI9481_GLCD_RS ON
      Set ILI9481_GLCD_CS On
    #endif

  #endif

end Sub

'''Send a data byte to the ILI9481 GLCD
'''@param ILI9481SendByte Byte to send
'''@hide
sub  SendData_ILI9481( IN ILI9481SendByte as byte )

  #if GLCD_TYPE = GLCD_TYPE_ILI9481

    #ifndef GLCD_ILI9481_16bit
        #ifdef PIC
          ILI9481_GLCD_DB7 = ILI9481SendByte.7
          ILI9481_GLCD_DB6 = ILI9481SendByte.6
          ILI9481_GLCD_DB5 = ILI9481SendByte.5
          ILI9481_GLCD_DB4 = ILI9481SendByte.4
          ILI9481_GLCD_DB3 = ILI9481SendByte.3
          ILI9481_GLCD_DB2 = ILI9481SendByte.2
          ILI9481_GLCD_DB1 = ILI9481SendByte.1
          ILI9481_GLCD_DB0 = ILI9481SendByte.0
        #endif
        #ifdef AVR
        PORTD = (PORTD & 0B00000011) | ((ILI9481SendByte) & 0B11111100)
        PORTB = (PORTB & 0B11111100) | ((ILI9481SendByte) & 0B00000011)
        #endif

          set ILI9481_GLCD_WR OFF
          set ILI9481_GLCD_WR ON

    #endif

    #ifdef GLCD_ILI9481_16bit
        Set ILI9481_GLCD_CS Off
        ILI9481_DataPortH = 0
        ILI9481_DataPortL = ILI9481SendByte
        set ILI9481_GLCD_WR OFF
        set ILI9481_GLCD_WR ON

        Set ILI9481_GLCD_CS On
    #endif

  #endif

end Sub

'''Send a data word (16 bits) to the ILI9481 GLCD
'''@param ILI9481SendWord Word to send
'''@hide
Sub SendWord_ILI9481(In ILI9481SendWord1 As Word)

  Dim ILI9481SendWord1 as Word
  #ifdef GLCD_ILI9481_16bit
    Set ILI9481_GLCD_CS Off
        ILI9481_DataPortH = ILI9481SendWord1_H
        ILI9481_DataPortL = ILI9481SendWord1
    Set ILI9481_GLCD_WR Off
    Set ILI9481_GLCD_WR On
    Set ILI9481_GLCD_CS On
  #endif

End Sub

[kent_twt4]

@Stan,

No, not that simple, there is more to it than that... More substitutions happen in a few other places in the library, init, and of course various housekeeping requirements when encountered. One would try and incorporate all interfaces into one sub (like sendcommand, senddata etc.), and use defines for both the 8bit and 16bit interfaces.

[Anobium]

And, the regression testing. Kent - you are spot on - simply things down please.

[stan cartwright]

re regression testing..had to look it up
When I look at c glcd includes they look device dependent...not really clever at c though.
Again, is it worth the effort over a spi glcd and is that faster than i2c ?
Why do glcb includes test the device ie if def glcdxxx then.. when it's the include for glcdxxx anyway?

[Anobium]

You are joking of course? Editing an existing piece of code requires regression testing. It is very simple to make an error and testing should pick up the errors - a simple #if may look like it is working for a specific configuration but this is no warranty that something else is not impacted.

[stan cartwright]

No. Serious. If someone asked what I been up to lately and I said regession testing..
I have wondered why the glcd includes are not just for one device.
No point in modifying includes except for personal use as I don't think modded libs as in arduino by joe bloggs would be popular
I just thought for example the pset which is essential to gcld but it's a sub with the call-ret overhead which is significant in lines and fills. If each device had it's own lib would that be better?
I might time some alterations. What would be best way to time repeated lines,etc on a uno...print result to display :)