piclist 2002\01\23\085050a >
Thread: Replace old chips ?
www.piclist.com/techref/index.htm?key=replace+old+chips
picon face BY : Russell McMahon email (remove spam text)



NMEA is utterly trivial to extract time from.
4800 baud string in a well defined format with time at a fixed location in
the string.

Here is two sets of data for a device with no satellite lock.
This is sent once per second.

$GPRMC has time in UTC as first data element (000101 and 000110 in two
readings here)
The clock can tell where it is as a bonus and eg set local time as well as
GMT !!!!
.

You could use this on a second by second basis or for occasional checking of
xtal clock.
.$PRWIZCH "sentence" is non standard Talon Technologies proprietary string.
Not a silly idea for a "tourist" type use - not what a sailor wants I
imagine.
_____________


$PRWIZCH,20,0,20,0,20,0,20,0,19,0,19,0,20,0,19,0,19,0,20,0,19,0,19,0*4D
$GPGGA,,,,,,0,00,,,,,,,*66
$GPGSA,,,,,,*42
$GPRMC,000109,V,3648.3912,S,17444.5462,E,0.000,0.0,290697,19.5,E*4D

$PRWIZCH,20,0,20,0,20,0,20,0,19,0,19,0,20,0,19,0,19,0,20,0,19,0,19,0*4D
$GPGGA,,,,,,0,00,,,,,,,*66
$GPGSA,,,,,,*42
$GPRMC,000110,V,3648.3912,S,17444.5462,E,0.000,0.0,290697,19.5,E*45

____________


             Russell McMahon

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