Communication between PC and PIC16f876

[skimask]

SERIN PORTA.4,N9600,["@"],char

Look thru the '876 datasheet...see if you can find anything special about PortA.4.

[mackrackit]

Look at this
http://www.picbasic.co.uk/forum/showthread.php?t=561

Playing with the clock speed might work, but I think you are asking for problems doing this.

Why not slow the VB program dow to 9600 or use the SERIN2/SEROUT2 command at the PIC. 19200bps is supported with SERIN2/SEROUT2.

[mister_e]

My 2 cents... why using SERIN anyways as this PIC have a built-in USART?

For once Skimask says a nice pointer...

ADCON1=7

Should help a little bit

Ca devrais marcher

[skimask]

My 2 cents... why using SERIN anyways as this PIC have a built-in USART?
For once Skimask says a nice pointer...
ADCON1=7
Should help a little bit
Ca devrais marcher

Not to mention the other 'special thing' about RA4...

[mister_e]

Yeah but... used as input i won't change anything... and it's not a A version, so no comparator thingy... even if... it's already disabled at POR...

[knsteam]

Hello everybody
Thank you for your answers

I would like to know how to initialize the UART.
Here is how I have make but that does not work.

(19200bps,No parity,8 bits,and 1 stop bit)

TXSTA = $20 '//Transmission sur 8 bits, pas de parité, mode asynchrone
RCSTA = $90
SPBRG=25

[mister_e]

Bonjour,
Depending how you want to use the USART, the initialization setup will be different. Let's say you want to read/write from the PIC USART register (RCREG/TXREG) yourself, your setup above is almost what you need but not not 100% exact. for a 9600 baud @4MHZ, the setup will be

RCSTA = $90 ' Enable serial port & continuous receive
TXSTA = $24 ' Enable transmit, BRGH = 1
SPBRG = 25  ' 9600 Baud @ 4MHz, 0.16%

But more than often we want to use the power of a PBP built-in command, hence HSERIN/HSEROUT. In that case the right setup will be.

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
DEFINE HSER_SPBRG 25  ' 9600 Baud @ 4MHz, 0.16%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically

This also assume you're going to use the PIC dedicated I/Os (TX/RX)

I would suggest you to download and use my PicMultiCalc, yeah i know i sound like a broken record but... agreed it's an handy tool.

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

Bonne chance!