I am a newbie to microcontroller programming I am using ccsc compiler and
written a program to communicate to PC thru RS232 interface
It uses users232 directive.just that ..and after that i wrote putc
functions.
But its not sending the character i mentioned in putc but any random
character is coming on hyperterminal ....

#include <18F4550.h>
#fuses HS,NOWDT
#use delay(clock=3D20MHz)
#use rs232(baud=3D9600,parity=3DN,xmit=3DPIN_C6,rcv=3DPIN_C7,bits=3D8,BRGH1=
OK,STOP=3D1)

void main()
{
char c;
set_tris_c(0xBF);
enable_interrupts(GLOBAL);
enable_interrupts(INT_RDA);
while(TRUE)
{
c=3Dgetc(); //if getc() timeouts 0 is returned to c
putc(c);
}
}


his is my program which gives this following o/p on hyper terminal, in echo
mode in hyperterminal.

dD ddddddffffffaybzaybzddeettyyzzayayaybzbzbzc{

Where in most characters are correctly transmitted and received like dd ee
ff etc but definite characters like a, b, c which are converted to definite
wrong characters like

a is transmitted but received is y similarly b----> z c----> { everytime

point to be noted is
a=3D97 0110 0001 in ascii
y=3D121 0111 1001

b =3D 98 0110 0010
z=3D122 0111 1010

similar for c------>{

Please reply, I have tried for hours but not able to come out why there is
problem with definite few characters.
They only come wrong everytime.






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Thanks & Regards
Nidhi Mittal Hada
Scientific officer D
Computer Division
Bhabha Atomic Research Center
Mumbai

http://nidhi-searchingmyself.blogspot.com/
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