STW TC1, User Manual

Page: 83 / 374

6 Software
User Manual 83/374
6.7 Temperature Sensor
Low Level Hardware Access
Path Input
information Output
information Description
/sys/bus/spi/devices/spi32766.1/temp1_input - p1 This user space interface reads
the current temperature of the
temperature sensor in degrees
celsius.
p1:
< 0..n > = Temperature in in
degrees celsius multiplied by
1000
Example: Read and calculate the temperature
1. Read out the temperature
# cat /sys/bus/spi/devices/spi32766.1/temp1_input
54750
2. Calculate the temperature in degrees celsius manually
54750 / 1000 = 54,750 °C
6.8 GPS
For GPS handling use the GPS daemon that handles the GPS interface automatically.
Precondition:
The GPS daemon must be started. The GPS daemon is not started during the boot up automatically.
How to activate the network daemon see GPS daemon (see " GPS daemon " on page 95)
Library functions for the GPS
Function Brief
ygpsd_get_gps_data (see
"
ygpsd_get_gps_data " on page
229)
The TAF library function receives the data from the GPS module.
High Level Hardware Access
Path Input
information Output
information Description
/etc/init.d/scripts/gps p1 - This shell script starts and stops the internal GPS receiver
connected via /proc/stw_gps/port. It is already started by
the boot up sequence.
p1: