Graphical Displays with PBP3

[rocket_troy]

there is no problem pbp just doesn't understand conditional compilation, ignore the warnings

Maybe it's because I thought I needed to compile that include file (on its own) where I probably don't?

Anyway... hmmm... I'll recheck everything and maybe try the serial option if I can't get the parallel working. So far I can't see anything I was doing wrong.

Cheers,

Troy

[richard]

Maybe it's because I thought I needed to compile that include file (on its own)

include files will seldom if ever compile on their own

[rocket_troy]

include files will seldom if ever compile on their own

Cool. I think the parallel version did which probably gave me the wrong assumptions. Anyway... couldn't get the parallel option working after trying both displays and throwing everything at it. I'm guessing there was a jumper fuse on the display that needed soldering closed to configure the data lines from 8 to 4, but I couldn't find any datasheet for the display so gave up that and went to serial. Took a bit of head scratching to match up the I2C lines to completely different labelled pads on the display, and then I finally got something from the display - a bunch of plain (non graphical looking) 1s and 0s. Took me 5-10 mins to figure out that's actually what was supposed to be there for the serial code - I was expecting demo graphics and large text - but that simply required copying over that stuff from the parallel code.
So, good stuff again Richard. Hats off and thanks again for the assistance.

Cheers,

Troy

[richard]

glad you got something to work

for parallel mode there is a pin PSB that needs to be set high on the display low for serial

i used this ds for reference

[rocket_troy]

for parallel mode there is a pin PSB that needs to be set high on the display low for serial

yeah, I knew about that - that's actually what I was referring to in my post #30, BUT what I didn't know (from glancing over the datasheet you just provided) was that I might have needed to pull data line #5 to ground to configure 4 line mode . Damn.

Cheers,

Troy

[richard]

i don't remember doing that and there was no pin on the 20 pin connector to do that. maybe there was a jumper on the display but i thought it was a software selection.
the parallel conn is on d3 - d7 with d0 - d3 grounded
the display is off in another project and no longer available to me for confirmation

[rocket_troy]

Well, there's 2 things I never considered - (1) using the upper 4 data lines for transfer and (2) grounding the unused.
It's probably worth mentioning (for a heads up to others) the display I'm using has a serial/parallel 3 pad jumper on the back that was soldered to parallel setting as purchased. I needed to change that to serial in order to operate in serial mode. Whether that eliminates the need to pull/push the PSB pad I never bothered finding out - I just assumed the PSB pad still needed setting.

edit: just after posting that I realised that jumper is probably a direct link to the PSB pad to push or pull - duh.

Troy