> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of David Dolheguy
> Sent: Saturday, January 10, 2004 7:12 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: UART Help needed to PC
>
>
> is a delay really required after sending each charater to TXREG?

The hardware takes TIME to shift out the bits... Many clock cycles.
I use the flags and IRQs to allow other processes to proceed while
the hardware sends the byte.


  *
  |  __O    Thomas C. Sefranek   WA1RHP@ARRL.NET
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41, PL 74.4

http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org
>
> -----Original Message-----
>     From: "Jason Harper"<JasonRandHarper@COMPUSERVE.COM>
>     Sent: 10/01/04 5:58:01 PM
>     To: "PICLIST@MITVMA.MIT.EDU"<PICLIST@MITVMA.MIT.EDU>
>     Subject: [PIC]: UART Help needed to PC
>       David Dolheguy wrote:
>
>     > static void usartput(unsigned char c)
>     > {
>     > while(!TRMT1)
>     > TXREG1=c;
>     > }
>
>     This basically says: for as long as there is something in the transmit
>     buffer already, send the same character anyway...  You need a
> semicolon at
>     the end of the 'while' line.
>
>     Note that TRMT isn't usually what you want to poll for serial
> transmission:
>     it doesn't get set until the character is entirely sent, when you can
>     actually put another character into TXREG much sooner due to
> the USART's
>     internal buffering.  Poll the TXIF bit instead.
>
>     Also note that continuously sending the same character is not
> necessarily
>     going to result in that character being received at the PC,
> since there's
>     no guarantee that it will sync to your start/stop bits.  An occasional
>     pause, of at least one entire character time, will ensure
> synchronization.
>             Jason Harper
>
>     --
>     http://www.piclist.com#nomail Going offline? Don't AutoReply us!
>     email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body