16f88 to parallax 2x16 lcd

[rdxbam]

thanks for the tip. i dl'd two of the code samples from that page, mixed and matched and it still didn't work. i looked too at the melabs pages for the diff's of BS2 and PBP, just in case. but i did get it to work ,,,

0. without setting the values for these, OSC and OSCCON, could not get anything written to the LCD. i set them for 8MHz, as 4MHz would not work. so i looked at section 4.6.1 of the datasheet and set the following...

DEFINE OSC 8
OSCCON= %01110100 ' internal RTC Oscillator freq select
' [bits 6-4 = 8MHz], [bit 2] INTOSC freq stable bit set

1. configuration was set as HS, WDT_ON, PWRT_ON, BOD_ON, MCLR_OFF, PROTECT_OFF

2. the baud rate set using these values, "396 or 16780" didn't work for me. but t2400 does.

thanks for your help!!!!

[mackrackit]

I do not have the same LCD as you have to test, so I am not positive the commands are correct.

BUT...I now see some other problems.
First, with out changing any of your settings make an LED blink at say one second on and one second off and see if the timing is correct.

LOOP:
HIGH PORT?.?
PAUSE 1000
LOW PORT?.?
PAUSE 1000
GOTO LOOP

When you see it is not, here is why.
In your config settings HS is for an external OSC, you need "_INTRC_IO"

Wait a minute ... Did you get it working???

2. the baud rate set using these values, "396 or 16780" didn't work for me. but t2400 does.

[rdxbam]

yes, i did get it to work. and yes, i am able to get a LED to blink from PORTB.3 and get string of char's to display on the LCD now.

and, this is whether i set INTRC_OSC or EXTRC_OSC. although i am not using an external OSC!

for my current code, at least from the process of elimination, having these two values, "DEFINE OSC x" and "OSCCON= x" set correctly made the difference along with the baud rate.

thanks!

[rdxbam]

Hey Mackrackit,

forgot to mention this...SEROUT2 vs SEROUT. i.e., SEROUT2 didn't work for me. once i switched to SEROUT, along with the other modifications, it has worked well. looks like some diff with the "true" or "inverted" mods with baud?? as i'm new to this hard to say for sure...

thanks!

[mackrackit]

Hey Mackrackit,

forgot to mention this...SEROUT2 vs SEROUT. i.e., SEROUT2 didn't work for me. once i switched to SEROUT, along with the other modifications, it has worked well. looks like some diff with the "true" or "inverted" mods with baud?? as i'm new to this hard to say for sure...

thanks!

Just for fun now that it is working, try the SEROUT2 again.
SEROUT is 8N1 so SEROUT2 396 should work. But maybe that is why MELABS has SEROUT so it works with Stamp stuff??

[rdxbam]

SEROUT2 396 worked

>>But maybe that is why MELABS has SEROUT so it works with Stamp stuff??

they are similar to the BS2 commands according to the PBP docs:

http://www.melabs.com/resources/pbpmanual/5_61-5_64.htm

i think, in my case, not getting the OSC & OSCCON defined correctly was throwing my troubleshooting off, and thus, at times, incorrectly thinking SEROUT2 was not working.