PIC18 Series and TFT question

javi.ar · Joined: 17 Feb 2006 Posts: 59 Location: Argentina

Hi, I am developing a board which has a TFT LCD Touch screen 2.4". I have to dispay temp & time (and couple of motor spin and heaters )
The question is, will 18F series will be able to handle the display? (in terms of speed ) I was thinking of using 18F87K22, has 67 I/O, 128K flash memory, 4K Ram and 1K eeprom, 16Mhz internal oscillator.
Or I should move to a PIC24/32 series?

Thanks in advance, wait for your opinions.

Ttelmah · Joined: 11 Mar 2010 Posts: 19535

Yes, easily.
Assuming something like a graphic controller, you can drive an LCD like this from PIC's dozen's of times slower than this.
The big question is what else it has to do. There is a big difference (for example, between just reading temperatures and displaying them, and doing something like PID.

Best Wishes

temtronic · Posted: Thu Jan 17, 2013 10:29 am

Seems like overkill to me, but what is the TFT interface? SPI,I2C,XXX????
Then again I use the 18F46K22 for 99% of my projects...big or small.

Can't be a whole lot of pixels on a 2.4" screen and LCDs are generally slow, so really, you'll have to read the datasheet,check timing specs and figure it out.

I'd search the web, checking for articles about using your LCD.Remember you're not the first one using it!

hth
jay

javi.ar · Joined: 17 Feb 2006 Posts: 59 Location: Argentina

MikeW · Joined: 15 Sep 2003 Posts: 184 Location: Warrington UK

I have done a project using a PIC18F, 320x240 TFT with touchscreen.

I used the 8 bit wide data bus, and it is fine.

javi.ar · Joined: 17 Feb 2006 Posts: 59 Location: Argentina

temtronic · Posted: Tue Jan 22, 2013 9:02 am

Sounds like a very ambitious project, worthy of 3-6 months of coding.
Depending on the time left and your skill level it might not be doable.
You could 'google' your LCD module and see what results come back. Odds are real good the mfr or someone has used it before, written drivers (even BASIC ones) that could be modified to CCS C.
If you use the proper 'keywords'. Google is very fast at finding exactly what you need.
hth
jay

MikeW · Joined: 15 Sep 2003 Posts: 184 Location: Warrington UK

The driver shouldn't be much of a problem.
Find out what chip it is, probably an IL92xx, or SSDxxx
or whatever, then google to find loads of sample code, then massage it into PIC/CCS.
It took me several weeks, and I wrote my own circle, font routines based on GLCD stuff.

My application has a display window with nice temperature settings and actuals, and with the touchscreen (easy to do).
I implemented context sensitive virtual keyboard or entering new setpoints etc.

javi.ar · Joined: 17 Feb 2006 Posts: 59 Location: Argentina

Thanks for the update. very kind

bkamen · Posted: Tue Jan 22, 2013 5:55 pm

javi.ar · Joined: 17 Feb 2006 Posts: 59 Location: Argentina

Yes it has the internal controller ILI9325, I will now make the PCB for connecting and debugging. I will let you know how did it work. I will start with the driver, now that I know which controller has on it. I might try to port it from Microchip. Thanks guys I´ll keep you updated. Thanks for your help and time...