polling information in rs-232

[Tondunard]

Hi all,

i'm new to your community and in search of a (probably) simple answer to my problem.

pardon my inexperience, but to learn i guess the best way is to start asking for help (after doing a big search everywhere; OF COURSE ).


my problem:

i have a strip of data from a gps unit in NMEA

$GPGGA,150126,4521.3660,N,07317.9876,W,1,03,102.3, ,,-032.30,M,,*1D

i use a 16f877a (to receive it's no problem)

the problem is that i want to re-send that information ($GPGGA, etc....) every second while i still watch the next incoming data.

here's a simple example:

' This will set the serial port 4800
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 20h
DEFINE HSER_BAUD 4800
GPS VAR byte
char var byte


main:
' receive from GPS unit
Hserin [char] ' <- works!
GPS = GPS + char '<<<< that part is causing the problem >>>>
' send to computer
hserout [GPS]
goto main:

what i really want to achieve is that the part "hserout [char]" would transmit to the PC every second while i still check the incoming "Hserin [char]" from GPS unit

i know there might be a much simpler way to do this, so i need a bit of your experience please.

Tried to lower the baudrate, tried with interrupt, etc... the "GPS = GPS + char" cause some garble characters in the receiving process...
If i use a LOOP in the "hserout [GPS]" i prevent the reception of new data from GPS unit.

there might be a way while reading the RECREG , but i don't know how....


Awaiting your help