Please help with EDE702 - Serial to LCD interface

[skimask]

'*****************************************************************
' Using PortB.2 to serially transfer data to EDE702
' PortB.2 going to EDE702's RCV port (pin 17)
' LCD connected to EDE702
' Internal OSC used for 16F628A
' 4 MHZ cristal used for EDE702
'*****************************************************************
@ DEVICE PIC16F628A, INTRC_OSC_NOCLKOUT, WDT_OFF, LVP_OFF, PWRT_OFF, PROTECT_OFF, BOD_OFF

Use an external crystal and see what happens.
And if you don't have one, since you DO have an o-scope, might want to change the program, make it change the portb.2 line at a known rate, check it with the o-scope and see how far off (if any) your internal oscillator is.
Also, check Appendix A of your PBP manual. 9600 baud at 4mhz is a bit iffy. Try 2400 baud, try a higher clock, try using the hardware UART, try anything.

[mackrackit]

Tom,
Can you post a schematic of the way you have things connected.

And

Try connecting to a PC using hyper terminal or something, this will test your PIC and code.

[Archangel]

Check out this post, code in post 16.
http://www.picbasic.co.uk/forum/showthread.php?t=4972

[Tomexx]

mackrackit,
I didn't draw a schematic, just used/modified the one from the EDE702 datasheet. I'm attaching both the datasheet and a simplified schematic.
Note the schematic shows line coming from the PS's serial port but in my case the line is coming from the PIC.
Joe,
I read the whole topic and while the code works, it is too complex for me. Plus I'd have to have MPASM and compile using that... Not sure how to go about that.
Post #25 looks promissing and I can actually understand it!
I'll try that one first and if it's loosing characters then I'll try to use yours.

Thanks,
Tom

[skimask]

In your original program, change BAUD CON 2 to BAUD CON 6 and see what happens...
Key phrase here is:

Note the schematic shows line coming from the PS's serial port but in my case the line is coming from the PIC.

The PBP manual will tell you why this matters...

[mackrackit]

If you are using the schematic posted... you did ground the OSC? The schematic is missing that.

MPASM is simple. Just install MPLAB from microchip (it is on your PBP CD) and tell MCS to use MPASAM.

The only thing you may need to do is change your configs for MPASM. Not a big deal.
http://www.picbasic.co.uk/forum/showthread.php?t=543

[aratti]

Your problem is the internal oscillator. As already suggested in post#4, use a 4 MHz xtal or a resonator also for the pic, and you will see that the serial communication will work.

Al.

[skimask]

Your problem is the internal oscillator. As already suggested in post#4, use a 4 MHz xtal or a resonator also for the pic, and you will see that the serial communication will work.
Al.

Might not be the internal osc though...
As has been pointed out somewhere (don't remember where) before, those internal oscillators aren't as loose as they used to be...unless of course it's an older chip in the first place.