Warning[202]

[KVLV]

I got this warning when compile my program. The whole message is "Warning[202]\PBP\PBPPIC18.LIB 7588 : argument out of range. least significants bits used. "

FYI: pic18F4550, MicorCode studio 3.0.0.5. pbp 2.50a.
The hex file when downloaded to my Pic work fine.

I really need your help understanding this warning.

Thanks in advance.

                      07567   LIST
000CF4 0100           07568 DUNN    MOVLB   0               ; 1 Reset banks to 0
                      07569 DUNN5   CLRWDT?NOP              ; 1 Hit Watchdog timer
                          M     IFNDEF NO_CLRWDT
000CF6 0004               M         CLRWDT
                          M     ELSE
                          M         NOP
                          M     ENDIF
000CF8 0012           07570         RETURN                  ; 2 Done
                      07583   LIST
000CFA                07584 INIT
                      07587   LIST
Warning[202]: Argument out of range.  Least significant bits used.
000CFA 0E38           07588         MOVLW   HSER_SPBRG
000CFC 6EAF           07589         MOVWF   SPBRG           ; Set baud rate generator reg
                      07590     IFDEF HSER_SPBRGH
                      07591       IFDEF SPBRGH
                      07592         MOVLW   HSER_SPBRGH
                      07593         MOVWF   SPBRGH          ; Set baud rate generator reg high
MPASM  5.14                      4550V260.ASM   12-15-2007  16:04:13         PAGE 25

[Darrel Taylor]

Hmmm, my guess, since it's a 4550.

It's running at 48mhz.
And you're trying to use a baud rate of 2400 or less.

Without using BRG16 of the EUSART, 2400 baud is too slow.

For the SPBRG/SPBRGH values, you can use mister_e's Pic multi-calc.

http://mister-e.org/pages/utilitiespag.html

<br>

[KVLV]

i remember correctly in my program that i set the baud rate anywhere. I am using CDCDESC.ASM for virtual com port.
I am using the orgional bootloader from Microchip.

[KVLV]

i am learning how to use Mister E piccal.

thanks Darrel.

[Darrel Taylor]

i am learning how to use Mister E piccal.

That's the easy part.

Start the program
Click on EUSART calc
Enter 48 in the OSC field
Enter the baudrate in the appropriate place.

Click the "Copy PBP DEFINE's to clipboard" button
and paste them in your program.

i remember correctly in my program that i set the baud rate anywhere.

If you don't set the HSER DEFINE's in your program. PBP defaults to 2400 baud.

If there is an HSEROUT or HSERIN anywhere in your program (even if it never gets executed), PBP will automatically initialize the USART at the default settings, which are too low for 48Mhz.
<br>

[KVLV]

Thanks Darrel.

I searched through my program, there is a "Hserout" command, I commented it out and there is no further warning.

I did copy

 
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 46  ' 256000 Baud @ 48MHz, -0.27%
SPBRGH = 0
BAUDCTL.3 = 1         ' Enable 16 bit baudrate generator

when compiled, i got warning message "error[113] \pbp\pbpic18.lib 580 : symbol not previously define(baudctl)

But anyway I don't need the those DEFINE lines above so I just commented out, and there is no warning. The program when loaded to the pic work fine.

[KVLV]

I use USB on board of the pic for transmitting/receiving data.

[Darrel Taylor]

There are 2 possible places for the BRG16 bit.

BAUDCON.3
- or -
BAUDCTL.3

It depends on the chip. And for a 4550 it's BAUDCON.3

mister_e's calculator has a drop-down box for that.
But you have to know which one to use.


But like you said, it's fixed.
<br>

[KVLV]

indeed, substitue BAUDCTL.3 = 1 with BAUDCON.3 = 1, when compile produced no error.

[mister_e]

Life it isn't easy then