Can't set 38400 baud @ 48Mhz

[mister_e]

i suspect a asm math overflow, but can't reproduce it here... and... HSER_BAUD is not define so... i'm lost

Even worst.. if does the same thing even by writing to the USART register ???

what happen if you use only the CONFIG fuse, DEFINE OSC AND HSER DEFINEs?

edit: OK only by writing to the REGISTER, you'll have this error once you add a HSEROUT line, but it fix the problem when you use the DEFINEs as generated by the PicMulticalc as bellow

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
DEFINE HSER_SPBRG 56  ' 38400 Baud @ 48MHz, -0.16%
SPBRGH = 1
BAUDCON.3 = 1         ' Enable 16 bit baudrate generator

So the DEFINEs have to be there IF you're using HSEROUT/HSERIN... just because PBP try to load HSER_SPBRG and everything else
simple code

DEFINE OSC 48
RCSTA = $90   ' Enable serial port & continuous receive
TXSTA = $24   ' Enable transmit, BRGH = 1
SPBRG = 56    ' 38400 Baud @ 48MHz, -0.16%
SPBRGH = 1
BAUDCON.3 = 1 ' Enable 16 bit baudrate generator

HSEROUT ["HELLO"]

and it's .LST around warning 202

Warning[202]: Argument out of range.  Least significant bits used.
000018 0E38           07668         movlw   HSER_SPBRG
00001A 6EAF           07669         movwf   SPBRG           ; Set baud rate generator reg
                      07670     ifdef HSER_SPBRGH
                      07671       ifdef SPBRGH
                      07672         movlw   HSER_SPBRGH
                      07673         movwf   SPBRGH          ; Set baud rate generator reg high
                      07674       endif
                      07675     endif
00001C 0E20           07676         movlw   HSER_TXSTA
00001E 6EAC           07677         movwf   TXSTA           ; Set transmit control reg
000020 0E90           07678         movlw   HSER_RCSTA
000022 6EAB           07679         movwf   RCSTA           ; Set receive control reg

INTERESTING !!!! HSER_SPBRGH is not even listed in the new PBP manual!!!

[Darrel Taylor]

Yup, you got it Steve.

Without the Define's, PBP defaults to 2400 baud and BRGH=0, which is too low for 48mhz.

But, in the first post, the defines were there. And those defines compile just fine.

So confused.

[mister_e]

yeah, weird... maybe a beta V2.46? who knows
12:14 here so

[Darrel Taylor]

Beta 2.46

[skimask]

Beta 2.46

You laugh...but for some reason I think I might have a one-off version of 2.46. I got it a couple of months after it came out. Then noticed that patch awhile after that, still haven't been able to get that applied successfully. Some of the PBP INC files are labelled 2.45, some much earlier than that (but then again, no need to waste time by renaming stuff if you didn't do anything to it right?). I emailed Jeff about it awhile back, he sent me an email back, I never did get around to sending a copy of my registration, etc. to get a new CD and he mentioned 2.47 was on it's way out, so I held off...
I'm wondering if this 2.46 isn't my problem with the SPI on the '4620, worked fine on the '452, never could get it to work on the '4620. Maybe 2.47 will fix that too, maybe Microchip will someday publish another errata...

At any rate... I still wonder if the original poster could easily get around this whole problem by setting the register values manually instead of relying on the compiler to handle it automatically...

[Darrel Taylor]

Woooaa, there's an Idea.

Jerry,

Have you run the Patch for 2.46 yet?
http://www.melabs.com/support/patches.htm

I did a long time ago, forgot all about it.

Good thought skimask.

P.S. The 2.47 upgrade will fix that if you didn't.

P.P.S. The patch is a PITA. because if you have modified the .INC files (like we all do for the configs), it won't run, until you undo the changes. If you haven't done it yet, just wait for 2.47. It'll save you a few hours of horror.

[mister_e]

P.P.S. The patch is a PITA.

mmm PITA