LCD serial backpacks

**timseven** · - 2nd October 2009, 03:43

Yes, was a typo I mean 24h. Yes, I used a 16F628-20 Mhz. I changed the crystal but not the caps, sorry. Mr. Flipper_ND, when I received the error I thought I shouldn’t go on, but I think that you got a point there, I’ll. First I’ll do the test with the two 15-33 pf caps in place and next test sending some data. I’ll report to both of you. Thanks.

**timseven** · - 2nd October 2009, 21:49

Let me report to both of you: I changed the caps and same error. I send the serial data and received it but unreadable and there is no clear screen neither. The program I am using reads as:
PAUSE 1000
SEROUT PORTB.1, 4, [254, 1] ‘Clear the screen
SEROUT PORTB.1, 4, [“ABCDE”]
END
I don’t know why but the PBP 2.50A compiler doesn’t accept
SEROUT PORTB.1, N2400, [254, 1]. (Bad Expression) doesn’t like the N2400. I don’t know if there is a distinction between the N2400 and the 4 alone.
I have spent hours investigating the hardware and the software for any error but find nothing bad. There may be a test program to check the backpack program.
BTW, To be able to write and compile this four lines “text sending serial program” I had to restore the 16F628 .INC file back to it’s original text. (Take the (;) out).
Any ideas of what may I doing wrong? Thanks.

**Darrel Taylor** · - 2nd October 2009, 22:04

The standard USART requires "TRUE" levels.
N2400 is "Inverted".

Use mode 0 (T2400).

And to use the N2400, T2400 T9600 etc.

Code:

INCLUDE "modedefs.bas"

**timseven** · - 3rd October 2009, 03:09

I did the Include "modedefs.bas" and also sent all kind of modes from 0 to 11 with different characters on the display but none of them good. What I thought would be the simplest trouble shooting became the hardest for me. I don’t know what to do next. Thanks

**Darrel Taylor** · - 3rd October 2009, 03:17

I don’t know what to do next.

Me neither.

**timseven** · - 3rd October 2009, 04:16

Thank you any ways. I'll keep reading post about it and see what ideas comes up. Thanks to all of you. TimSeven.

**flipper_md** · - 3rd October 2009, 05:05

Hi Guys

I was having trouble the other days with serial stuff and Bruce(rentron) pointed me at using PIC to PIC for testing.
So I setted up a cute 12F683 running it's internal 8mhz osc (then you plug only Power+Ground, it's running), and have a little program sending:
- TRUE 9600 on one pin with serout,
- INVERTED 9600 on another with serout,
- and debug at 38400 on another one, constantly in a loop.
Validate that your computer can see the data(with a max232) and then you should be able to use it to feed directly a PIC.

um, let me grab that proggie