2 x 2*16 Display

[Thomas]

Hallo!

Just to verifiy this, before start debugging on lower level. (electrical connections seems to be ok).

There is nothing to do (additional programming) when connecting two 2*16 LCD displays?

Only to set the cursor to 0x80 (first line of second LCD) or 0xC0 (seconde line of second LCD)?

The enable line of the second LCD is connected to PIC-Pin RC4.

All other connections are parallel.

LCD one works, LCD two do not.

Greetings Thomas

[TK.]

Hi Thomas,

yes, everything is correct. You could upload the MBSEQ V2 firmware just to check if you didn't made any error during the software reconfiguration.

Best Regards, Thorsten.

[Thomas]

Thanks, Thorsten.

I loaded MBSEQ V2 firmware and both LCDs work.

[TK.]

Alright, so maybe you forgot to configure the Y offsets in the application?

-> http://www.ucapps.de/cmios_fun.html#MIOS_LCD_YAddressSet

Best Regards, Thorsten.

[Thomas]

Alright, so maybe you forgot to configure the Y offsets in the application?

The problem is I haven't.

But let us assume that I did.

What would the following code produce?

Will there be output on the second LCD?

unsigned char i;

for (i = 0; i < 256; i++){

  MIOS_LCD_CursorSet(i);

  MIOS_LCD_PrintChar('T');

}

Practically it didn't. My guess was that initialization for the seconde LCD is missing because it shows the black bar in the first line.

[TK.]

Yes have to set bit #7 in the Y2 and Y3 offset (-> MIOS_LCD_YAddressSet), otherwise the second LCD won't be initialised. I think that this makes your other question obsolete :)

Best Regards, Thorsten.

[Thomas]

Hallo Thorsten!

That's my code in main.c:

void DISPLAY_Init(void) __wparam

{

  display_init();

 

  MIOS_LCD_CursorSet(0x80);

  MIOS_LCD_PrintCString("hallo!");

  MIOS_LCD_CursorSet(0xc0);

  MIOS_LCD_PrintCString("Thomas!");

}

Where display_init() only calls MIOS_LCD_YAddressSet:

/** initializes the display */

void display_init(){

  MIOS_LCD_YAddressSet(0x00, 0x40, 0x80, 0xc0);

}

The second display is initialized but stays blank. 

What's wrong?

Are the offsets ok?

[TK.]

Hi Thomas,

the type initialisation has to be done in Init(), before DISPLAY_Init() is called

Sorry, I just have noticed, that this is a documentation gap

Best Regards, Thorsten.

[Thomas]

Thanks. It works now. :)