Communicate with PC at baud rate :115200 bps

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  1. - 8th March 2008, 19:50 #4
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    Quote Originally Posted by iugmoh View Post
    oky I have these things :
    1- max232 converter
    2- 4MHZ or 8MHZ crystal
    3- PIC16F877A or PIC18f452 or PIC4220

    I make a programm and put the values accoding to formula baud=fosc/(16(x+1)) or baud=fosc(64/(x+1))

    but the data I recived from pic at pc is a strange data not know
    "4MHZ or 8MHZ crystal" 4mhz too slow 8mhz probably too slow
    go get this from mister e http://www.mister-e.org/pages/picmulticalcpag.html
    using Mister_e's calculator set for 8mhz we get these settings:

    RCSTA = $90 ' Enable serial port & continuous receive
    TXSTA = $24 ' Enable transmit, BRGH = 1
    SPBRG = 16 ' 115200 Baud @ 8MHz, 2.12%
    SPBRGH = 0
    BAUDCON.3 = 1 ' Enable 16 bit baudrate generator

    You may need to slow the character pacing a bit. DEFINE CHAR_PACING 1000
    Last edited by Archangel; - 8th March 2008 at 20:28.
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