Hi All,

I am having hard time to determine the length of =A0uart RX data. the data =
length is unknown it is between (100-125 byte) and it is less then 128 byte=
s.
in my routine RX ISR clears the RX flag and saves the byte came in and incr=
eases the counter. data_available is not used for now =A0

void __attribute__((interrupt, no_auto_psv)) _U2RXInterrupt(void) {

=A0 =A0 uint8_t data_size_U2;

=A0 =A0 =A0 =A0 IFS1bits.U2RXIF =3D 0;
=A0 =A0 =A0 =A0 if (U2STAbits.URXDA =3D=3D 1)
=A0 =A0 =A0 =A0 {
=A0 =A0 =A0 =A0 =A0 =A0 U2_RX[new_counter] =3D U2RXREG; =A0 =A0 =A0// save =
incoming byte

=A0 =A0 =A0 =A0 =A0 =A0 counter++; =A0 =A0 // increment=A0
=A0 =A0 =A0 =A0 =A0 =A0 data_available =3D 1;
=A0 =A0 =A0 =A0 =A0 =A0 GLED_ON;
=A0 =A0 =A0 =A0 }

}


the counter contains total number of bytes but the question is how to check=
 when no more data is coming in? to use the counter.
I was testing with IDEL flag =A0=A0=A0 U2STAbits.RIDLE I can see when uart =
RX is active =A0the flag is set to 0. now the problem is
even on first receive byte the flag will indicate as busy. so just using wh=
en it is busy is not going to work. =A0
in my case I do not mind to deal with fixed 128 byte every time I already k=
now the data is some where between
100-125 bytes. the only issue is when there is no data coming in the interr=
upt will not occur and counting extra is not going to work.
=A0the counter in ISR knows exact =A0length=A0of=A0bytes came in but I do n=
ot know when to check the counter since I do not know the length of data.
i am not sure if I explain clearly. the counter and U2_RX are global variab=
les.

any idea or suggestion will appreciate.

thanks

Andre =A0 =A0=A0
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.