RS-232 Communication with PIC and Prog C++

[Volkanos]

I have this code for my RS-232 receiver. My transmitter program sends
( A,10| ) with no braket but when I use kbhit I receive only ( A, ). If I remove ( if kbhit()==1 ) I receive ( A,10| ). Can anyone help finding out why there is only ( A, ) in the buffer when I use kbhit?

#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

if(kbhit()==1)
{
for(i=0;Lecture[i-1]!='|';i++)
{
Lecture = getc();
}
Lecture[i]='\0';
lcd_gotoxy(21,1);
printf(LCD_PUTC,"%s",Lecture);
}


Thanks.

[Ttelmah]

The answer is probably luck!....
Your test is dangerous. What does 'Lecture[i-i]' contain when i=0?...
It will actually address another piece of memory outside the array, which may contain something legitimate or not. On a PC, this code would fail, with a memory access error, but the PIC, contains no memory manager, and will perform the operation.
Adding the kbhit test, is probably just resulting in this illegal access returning a different value, and failing.
Change your addressing, so that either you start at address '1', and put your own defined value in addres '0', _or_ move the test till after the character has been fetched (do..while).

Best Wishes

[Volkanos]

I tried this code and it read 2 characters, and it waited for a another characters. The buffer is empty after 2 characters. How much characters can the buffer contain.

int i = 0;

while(kbhit()==1)
{
Lecture[i]=getc();
printf(LCD_PUTC,"%i",i);
printf(LCD_PUTC,"%c",Lecture[i]);
i++;
}

Thanks.

[dyeatman]

The UART can buffer only two characters. Just a wild guess but, since I can't see the rest of your code, are you getting to the end of the code and the processor is htting the hidden sleep instruction and going to sleep?

maybe try something like: