Can't set 38400 baud @ 48Mhz

[b1arrk5]

Steve,

Como ca va? Tres bien! Forgive my spelling, but your hex file loaded and works perfectly! This means that I have my programmer etc. set correctly. Just two quick questions then; a) are you using PBP 2.47? b) would you please try adding this to your USB demo program and see what happens. I placed these right after the Define OSC 48 line.

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

cren var rcsta.4
hserout ["Yes we have no bananas!",13]

When I take these lines back out the program compiles fine. The good news is that I've almost memorized the 18f4550 datasheet this weekend! I also tried adding this;
asm
mov w,1
movlw spbrgh
mov w,56
movlw spbrg
endasm
right after the _config portion of the program, but no luck. I'm don't do assembler, but I read Myke Predko's book, and can follow along.

Thanks again, and don't shovel too much snow!

Jerry.

[Darrel Taylor]

Maybe I'm reading the PicMultiCalc wrong but...

With BRGH = 1 (TXSTA = $24), and BRG16 = 1 (BAUDCON.3)

Don't you need SPBRG = 312

[Darrel Taylor]

Doh!, nevermind.

Got confused with SPBR<G:H> notation.

Lowbyte = 56
Highbyte = 1

[mister_e]

Como ca va? Tres bien! Forgive my spelling,

Ca va très bien you spelling is not that bad. Como=Comment

but your hex file loaded and works perfectly! This means that I have my programmer etc. set correctly.

Woooohooo!

a) are you using PBP 2.47? b) would you please try adding this to your USB demo program and see what happens. I placed these right after the Define OSC 48 line.

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

cren var rcsta.4
hserout ["Yes we have no bananas!",13]

Yes i use PBP 2.47, and your lines will work no problem.

Thanks again, and don't shovel too much snow!

i'll try


EDIT: i'll change the PicMultiCalc display stuff.. it's really simple and i agree, it will be easier to read.

[b1arrk5]

I called MeLabs this morning as soon as they opened, ordered the upgrade, and they shipped it this afternoon. Thanks for all your help. I'm curious though that Darrel got it to compile ok with 2.46, but maybe it has to do with the temperature. I think you and I should go to California and investigate!
Thanks to all of you for your kind assistance.

Jerry.

[mister_e]

You're welcome. in meantime, i've did the promised change to the PicMultiCalc

You can download it at the usual place
http://www.mister-e.org/pages/utilitiespag.html

[Darrel Taylor]

b1arrk,

It's good to have the upgrade.

But for future reference, I'd still like to figure out what's going on. And I'm still not sure it will solve your problem.

Can you go back to the .LST file again? Search for [202], and post the 5 or 6 lines following the error.

[b1arrk5]

Hi Darrel,

Here are the lines from the .LST file. I hope that you find something useful here. It's great that we can come here and get professional level assistance from guys like you, Skimask and Steve, especially on the weekends when a lot of us have more time to work on our projects, so if I can provide any additional information please let me know.
code
Warning[202]: Argument out of range. Least significant bits used.
000498 0E38 07695 movlw HSER_SPBRG
00049A 6EAF 07696 movwf SPBRG ; Set baud rate generator reg
00049C 0E20 07697 movlw HSER_TXSTA
00049E 6EAC 07698 movwf TXSTA ; Set transmit control reg
0004A0 0E90 07699 movlw HSER_RCSTA
0004A2 6EAB 07700 movwf RCSTA ; Set receive control reg
07723 LIST
0004A4 07724 main
0004A4 EF1F F006 00012 goto MAINPROG
00013 include "USB18.INC"
00001 ; MUID = Microchip USB Class ID
00002 ; Used to identify which of the USB classes owns the current
00003 ; session of control transfer over EP0
00004 #define MUID_NULL 0
00005 #define MUID_USB9 1
00006 #define MUID_HID 2
00007 #define MUID_CDC 3
00008 #define MUID_MSD 4
00009
00010 ; Buffer Descriptor Status Register Initialization Parameters
00011 #define _BSTALL 0x04 ; Buffer Stall enable
00012 #define _DTSEN 0x08 ; Data Toggle Synch enable
00013 #define _INCDIS 0x10 ; Address increment disable
MPASM 5.06.4 MARCH3~1.ASM 3-4-2007 18:59:54 PAGE 23
/code
I don't pretend to be an assembler wiz, I did take a course years ago in 6800 and 68000, but I didn't use it for more than ten years, and of course the Pic is a little different. But I don't see any mention of SPBRGH anywhere here.
Once again, thanks for all your effort, and I look forward to hearing what you figure out.

Jerry.

[skimask]

(It's great that we can come here and get professional level assistance from guys like you, Skimask)

Warning[202]: Argument out of range. Least significant bits used.
000498 0E38 07695 movlw HSER_SPBRG
00049A 6EAF 07696 movwf SPBRG ; Set baud rate generator reg
00049C 0E20 07697 movlw HSER_TXSTA
00049E 6EAC 07698 movwf TXSTA ; Set transmit control reg
0004A0 0E90 07699 movlw HSER_RCSTA
0004A2 6EAB 07700 movwf RCSTA ; Set receive control reg

Jerry.

Wow! I ain't never been called no prefeshunol befowere...Gawllleee

Anyways...yep, right there at the top. The compiler isn't handling SPBRGH correctly, basically putting a value over 256 into a byte. However, I suspect that if you tell the compiler you want a baud rate of 13,636 (8 bit async, brg16 = 0, brgh = 0, 48mhz Fosc, etc.etc according to the datasheet should give you 56 in the SPBRGH, which should get automatically set according to the HSER defines), and then manually set BRGH high later on, it'll an up at 38400 baud. I would think this is something you should've been able to do manually, but I could be wrong...