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lcd display
Posted: Thu Nov 10, 2005 9:06 pm
by herve
Hi, I use flowcode V2
It's seems that the macro made to display on LCD doesn't change when I change the data bits to RB4 to RB7, RS and E to PB2 and PB3 :
when I look the asm file the data are still RB0 to RB3, RS and E RB5, RB6.
Does anyone know this problem ? is there a patch.
thanks
LCD Display
Posted: Sat Nov 12, 2005 8:18 pm
by jimhumphries
I had the same problem when connecting the LCD to port C of a 16F786.
I found that RS and ENABLE can be assigned to any bit on the port and the LCD operation simulates just fine but, in reality, these assignments must be β€hard wiredβ€ because the LCD didn't work when I moved everything to a PCB.
If went back and looked at the LCD help file and it does seem to imply that the connection order is "fixed". FlowCode seems to expect LCD EBABLE to be the highest bit – data 0 – 3 first, then RS, then ENABLE. When I corrected the PCB and firmware to connect D0, D1, D2, D3 to RC0, RC1, RC2 and RC3 – then RS on RC4 and Enable on RC5 - everything worked.
Jim
Posted: Wed Dec 07, 2005 10:41 am
by Ian
We have been looking at the LCD component to see what the problem was.
We found that there is indeed an error in the LCD component. The Pins are indeed hardcoded at the moment. (Amazed that it hasn't been spotted before.)
We are working on an update to the LCD component to fix this at the moment.
I will post a message as soon as we get the updated component done.
Posted: Tue Jan 03, 2006 6:19 pm
by Ian
We have a patched LCD Component on the website ready for downloading.
You can download the patch from:
http://www.matrixmultimedia.com/softwar ... isplay.zip
You should now be able to use custom connections, useful for getting around the LVP/Pin B3 issue.
Posted: Wed Jan 04, 2006 4:08 am
by jimhumphries
Thanks Ian. I'll download the patch.
Jim
Posted: Mon Jan 23, 2006 2:08 am
by jimhumphries
Steve:
There is an neat little Epson 4 X 12 character LCD available from earthlcd.com for around $6 but it uses the Seiko SED1230 type controller rather than the Hitachi. Can v3 be made to support either type controller without extensive extra effort?
Jim
Posted: Mon Jan 23, 2006 10:02 am
by Steve
Jim,
I'm afraid I don't have a clue without delving into the datasheet, and I can't afford the time to do this at the moment. It may be that the commands for the Seiko controller are compatible with the Hitachi one, and will work as it is - only close inspection of the datasheet and actually giving it a go with FlowCode will tell.
The other potential pitfall is that it is a 4x12 display. At the moment, the FlowCode LCD component is limited to 2x16 - although I do want to address this limitation in v3 of FlowCode.