Radarcape:Watchdog: Difference between revisions
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imported>Beastadmin Created page with "=Hardware Watchdog Retriggering= Starting with the 2nd production batch of the Radarcape, there is an external hardware watchdog foreseen. Due to the nature of the device, ru..." |
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=Hardware Watchdog Retriggering= | =Hardware Watchdog Retriggering= | ||
Revision as of 19:11, 6 October 2013
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The tasks described in this manual require advanced knowledge of Unix/Linux. |
Hardware Watchdog Retriggering
Starting with the 2nd production batch of the Radarcape, there is an external hardware watchdog foreseen. Due to the nature of the device, running 24/7 at various environmental conditions and remote locations, this extra safety is pretty useful. A MAX6371 device is beeing used for this, which needs to be retriggered once every minute on GPIO1_18. The first retrigger activity shall happen in the cape.sh shell skript as below, afterwards toggling GPIO1_18 should be done in the Linux application SW.
echo *** Configure Watchdog retrigger pin & toggle first time
echo 07 > /sys/kernel/debug/omap_mux/gpmc_ben1
echo 60 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio60/direction
echo 1 > /sys/class/gpio/gpio60/value
echo 0 > /sys/class/gpio/gpio60/value
A single line retrigger command looks like:
while :; do echo 1 > /sys/class/gpio/gpio60/value; echo 0 > /sys/class/gpio/gpio60/value; echo 'Hit CTRL+C'; sleep 30; done
however it is expected that this retriggering is done in the Linux application software.