question that has bothered me for a while

science_geek

i was wondering about displays, i have a 4d systems display with a built in processor, its the 324028 uoled w/ touch screen, it has a built in processor and it has two pins that say "tx" and "rx" i was wondering if it would be at all to control this display with the prop, i know this isnt really a question, but more of a request of info, i need to know if i can use this with the prop without having to program the display, or as little as possible

Chris Savage

RX/TX lines implies a serial interface. So yes, you could use the Propeller to communicate with this display although you will need the datasheet for the command list.

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Chris Savage
Parallax Engineering

tpw_man

It might be asynchronous serial, directly drivable with FullDuplexSerial. Does it have a 'clk' pin or something labeled like that of any sort? Actually, looking at the manual, it appears that it is asynchronous serial, so yes, you can drive it with a Propeller. I cannot find any information on the baud rate.
Why did you not just look at the datasheet?

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I am 1011, so be surprised!


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science_geek

im not good with communication, thats why i asked, actually thats kind of the bases for my project im doing for school, just to learn it, no clk pin on it, i didnt look at the data sheet because i am still new to the prop and am not totally understanding of serial communication, my next million dollar question is, How do·i start a serial communication interface to it to just display stuff for like debugging purposes, just to get started learning how to do this, from what i understand about this display it is the same as the other smaller displays, thanx for the help and the awesome fast response

tpw_man

Well I don't have time to sort through the datasheet more, but here is some generic serial code. It would probably not work for the display without the correct commands, but the idea is there.

con
_clkmode = xtal1+pll16x 'assumes 5 mhz crystal
_xinfreq = 5_000_000

obj
ser : "fullduplexserial"

pub main
ser.start(<rxpin>, <txpin>, 0, <baud rate>)
ser.str(string("Hello World!")) 'NOTE: will probably not work without the correct commands

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I am 1011, so be surprised!


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science_geek

that is perfect, thank you so much, ive been trying to figure this stuff out and that is the push i needed, i think i can get it from here, but thanx a million, now, how do i go about getting time to play with this stuff, anyway, thanks a ton

Tubular

I use the same display though not currently with the Prop. You do indeed just need RX and TX. There are two firmware PmmC's available - Serial and 4DGL.

The Serial PmmC is probably simpler to get started with. The first command to issue is a single character 'U' which will let the display auto sync to your baud rate. After that you can send commands for lines, circles, text etc. If you want to read the touch screen you have to poll it with a '$T' command which returns the X,Y and touch status.

The 4DGL PmmC might be better if you have lots of menus or touch interaction etc. But you end up with two source codes for your project (one on the Prop and one on the uOled)

Good luck!
tubular