A simple (hopefully) RS232 setup question

[fredp]

Hi All,

My first post so be kind ;-)

I'm currently implementing a graphical touch-screen product using

Main MCU: PIC18F4680, external oscillator @ 40MHz
LCD Ctrl: SED1335
Touch Screen Controller Mod: Fujitsu N16B-0558-B230 (serial)

My question relates to communicating with the N16B-0558-B230. This is a pretty simple device but I'm having some difficulty configuring the RS232 for coherent communications.

Ok, I have a PC running HyperTerm connected to P6 and P7 (Uart) for bebugging. This is and has been working fine. For that I'm using:
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, BITS=1, PARITY=N)

I have the N16B-0558-B230 connected to D2 and D3
The PIC18F4680 manual (written bilingually in Japanese and English, yikes!) says this about the RS232 setup:
"Bit format: 1 start bit + 8 data bits + 1 stop bit Total 10 bits No parity"bits. They also list the speed as 9600 bps.

I've set up the rs232 thusly for the N16B-0558-B230:
#use rs232(baud=9600, xmit=TS_RX, rcv=TS_TX, BITS=9, FORCE_SW, PARITY=N, DISABLE_INTS, LONG_DATA)

Data comes over at the proper times... but I'm having some difficulty getting it to make sense.

Am I a bit short? (no pun intended). Any suggestions/comments?

Thanks in advance for your help

** Fred **

[SherpaDoug]

Why are you telling the PIC to use 9 bits when the display uses 8 bits?
Drop the bits=9 and see how that works.
_________________
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[PCM programmer]

[Guest]

Yes, C6 and C7, sorry. You're right, I don't know when I hosed the BITS parameter (BITS=1) but it sure is wrong... if it hadn't ignored it I would have had to fix it huh?

So the start-bit is implicit... good! It's usually not even brought up... which is what threw me.


Thanks bunches. I'm sure it'll be coherent now... specially since I just noticed I have to flip the bit-order (duh!)

Thanks again


Fred

[Guest]