NT7108 not working

[mmotte]

Electronic goldmine had a deal on CrystalFonz GLCD 12864 with a NT7108 controller. I checked in the GCB libraries and NT7108c was there. What luck. I wanted to make a graphing temperature device.

I can not make the GLCD work by print not graphics.
Yes I did set the V0 pin to -3vdc using a pot between +5vdc and -Vee. i can see the background is little squares on the blue backbackground.

I have search the GCB forum and using Mikan's minimal code. i have tried the demos.
I am using a 16F886. The Databus is on the 'A' port and the control lines on the 'B' bus because i need the hdwe I2C port for the sensor.

GCBCompiler is 9807.

;Chip Settings
#chip 16F886,8
'#option explicit
'#config OSC=INTOSCIO

  #include <glcd.h>
  #define GLCD_TYPE GLCD_TYPE_NT7108C               ' Specify the GLCD type

  #define GLCDDirection 0                           ' Flip the GLCD   0 do not flip, 1 flip

  '#define GLCD_CS1 PORTa.4    'D12 to actually since CS1, CS2 can be reversed on some devices
  '#define GLCD_CS2 PORTa.5

  #define GLCD_DB0 PORTa.0 'D0 to pin 7 on LCD
  #define GLCD_DB1 PORTa.1 'D1 to pin 8 on LCD
  #define GLCD_DB2 PORTa.2 'D2 to pin 9 on LCD
  #define GLCD_DB3 PORTa.3 'D3 to pin 10 on LCD
  #define GLCD_DB4 PORTa.4 'D4 to pin 11 on LCD
  #define GLCD_DB5 PORTa.5 'D5 to pin 12 on LCD
  #define GLCD_DB6 PORTa.6 'D6 to pin 13 on LCD
  #define GLCD_DB7 PORTa.7 'D7 to pin 14 on LCD

  '#define GLCD_RS PORTc.1
  '#define GLCD_Enable PORTa.6
  '#define GLCD_RW PORTc.0
  '#define GLCD_RESET PORTC.7

  #define GLCD_CS1 PORTB.0    'CS1 control line
    #define GLCD_CS2 PORTB.1    'CS2 control line
    #define GLCD_RS PORTB.4     'RS control line
    #define GLCD_ENABLE PORTB.5 'Enable control line
    #define GLCD_RW PORTB.3     'RW control line
    #define GLCD_RESET PORTB.2  'Reset control line

   ' Changed timing for 32 mhz device
   #define NT7108CReadDelay    9     ; = 5 normal usage, 5 or above is OK at 32 mhz!
   #define NT7108CWriteDelay   2    ; = 1 normal usage you may get away with 0, 2 or above is OK at 32 mhz!
   #define NT7108CClockDelay   2     ; = 1 normal usage you may get away with 0, 2 or above is OK at 32 mhz!

 'change to LED height, this,avoids set the 4 LED signals
  #define LED_GLCD_HEIGHT GLCD_HEIGHT

 dir portc.1 out
 'dir portc.2 in

 set portc.1 on
 wait 2 S

'------------------------
'GCB v0.98.03  2018-10-20
'------------------------

  GLCDCLS
  Wait 1 S
  do Forever

    GLCDPrint (10,10,"Hello") 'Print Hello
    wait 500 ms
    GLCDPrint (100,100,"Hello")
    wait 500 ms
      line (0,63,64,31)

   wait 400 ms

   wait 1 s
      portC.1 = 0
      wait 500 ms
      portC.1 = 1
    'GLCDCLS
  loop

note on portC.1 i hung an led for heartbeat / test to check execution of the code. It seems to execute but no display yet.

Then I hooked up the Saleae Logic8 and only the Enable and D/I toggle. never see anything on any of the DB port.

Is there any secrets with the NT7108c? Like do I need pullups? on anything?
I have triple checked wiring and it is solder to proto board.

Been working on this for a week, no luck.
Mike

[Anobium]

Have you tried increasing the delays?

state these constants
  #define NT7108CReadDelay    7      ; = 7 normal usage
  #define NT7108CWriteDelay   7      ; = 7 normal usage 
  #define NT7108CClockDelay   7      ; = 7 normal usage 

[mmotte]

I'm sorry I thought I answered but i sent it as email replay which don't get here.
Yes I have tried the different delays and actually they are in the NT7108c driver.h

So meanwhile I am starting to hack this by copying the 'InitGLCD_NT7108C' sub from the driver and making it run every big loop.
I wanted to see the signals work and the DB port.

I do see the /rst work and the CS1 and CS2 but still nothing on the dataport DB

[mmotte]

I tried writing directly to Port A but in the nt7108c .
And then the most direct.

Set GLCD_RESET Off
    Wait 1 ms
    Set GLCD_RESET On
    Wait 1 ms
    'Set on
    Set GLCD_RS Off
    'GLCDWriteByte 63
    PortA = 0xff
    'Set Z to 0
    'GLCDWriteByte 192
    PortA = 0x00
    'Deselect chips

the bits did not change.

Finally I made a separate PortA program completely bare. and PortA toggles

Proves the hardware and 16F886 are ok but ? which way now.

[Anobium]

Let us start at the begining. :-)

Got a photo of the back of the GLCD? Please post one.

Is this the right GLCD....

[mmotte]

Here is a picture of the back.

[Anobium]

I will be online and able to look my Wednesday @1100 London time.

[mmotte]

No emergency. I know I got too excited looking
Thanks for help

[Anobium]

I have spotted an error in the library. Introduced when I took the library from a contributor.

Please download and use the new release here: https://sourceforge.net/projects/gcbasic/files/Release%20Candidates/

Let me know if this resolves.

[mmotte]

Had trouble downloading RC32 from Sourceforge but finally after 3 tries it downloaded and i installed.

The change did not solve the issue. I started with a clean slate and made the Xconnections for control and data port . same results. Full pixel field on a blue background. But nothing printed nor drawn.

[Anobium]

OK. Please upload the source and the ASM you are producing.

[mmotte]

Here are the two files.

[Anobium]

Full pixel field on a blue background What do this mean?

Are you seeing a reset?

[mmotte]

I was hooking up the Saleae logic analyzer and could get no signals.
Then I put the PortC.1 Led to blink in the program I sent you. It would not blink anywhere

Then I tried the old Mikam.gcb and it wrote stuff on the screen!! yah! and the led blinks.

[Anobium]

Well, the library is not correct when writing to the port. This needs to be resolved. But, you are working now!

[mmotte]

So it only works with that one program. I have tried two of the other older variations and they do not work.

Getting closer!

I can hammer on this for a while.
Thanks for you help.

[Anobium]

The full port will be a lot faster... when it works.

Please increase NT7108CClockDelay tp 255. If that works then decrease till till stops....

#define NT7108CClockDelay 255