HSER baudrate

[mackrackit]

If you need to change the baud rate during run time do not use defines. Deal with the registers directly.

X VAR WORD
    START:
     RCSTA.4 = 0 : RCSTA.4 = 1
     RCSTA=$90:TXSTA=$24:SPBRG=129
     HSERIN [dec X]
     HSEROUT [DEC X.7,13]
blah
blah

[Archangel]

or there's Dave's way . . .

[mister_e]

When changing baudrate on the fly, you want to turn off the USART before though.

RCSTA=0
SPBRG=xyz
TXSTA = whatever, assuming it's value change from baudrate to baudrate
RCSTA=$90

[pedja089]

Thanks, guys.
Both examples helped me. Just to see which registers should be set. Today I'll try ..

[mister_e]

Get the latest version of my PICMultiCalc on this forum, it will give you a good kick.

[pedja089]

Everything works great. The calculator has really helped me.
Here's the code if someone needs it.

             IF HSerBaud=0 THEN
                RCSTA = 0
                SPBRG = 207 ' 300 Baud @ 4MHz, 0.0% 
                RCSTA = $90 ' Enable serial port & continuous receive
                TXSTA = $20 ' Enable transmit, BRGH = 0
             endif   
             IF HSerBaud=1 THEN
                RCSTA = 0
                SPBRG = 25  ' 2400 Baud @ 4MHz, 0.17%
                RCSTA = $90 ' Enable serial port & continuous receive
                TXSTA = $20 ' Enable transmit, BRGH = 0
             endif
             IF HSerBaud=$BD THEN
                RCSTA = 0
                SPBRG = 25  ' 9600 Baud @ 4MHz, 0.16%
                RCSTA = $90 ' Enable serial port & continuous receive
                TXSTA = $24 ' Enable transmit, BRGH = 1
             endif

[mister_e]

For safety sake, I would set RCSTA at the end, just after TXSTA.