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CheckSight user manual
Camera features and their control
application needs to periodically reset the watchdog timer — the resets serve as the application
“heartbeat”. As long as each new heartbeat is issued withing a specified timeout duration, the
watchdog stays silent. However, if the watchdog timer expires and the reset command is not issued,
the watchdog assumes the application (or entire system) is locked and reboots the camera. The
watchdog functionality is implemented in the FPGA, independently from the main camera control,
so it remains functional even if the operating systems itself gets locked.
After the camera boots, the watchdog is always inactive. If desired, the application has to enable
it explicitly (Watchdog Enable), specifying the desired Watchdog Timeout Duration. Once enabled,
the application is responsible issuing the Watchdog Reset signals in period lower than the configured
timeout to prevent the watchdog timeout expiration and device reboot. The watchdog can be
disabled again. Furthermore, the current Watchdog Timer Value (time remaining until expiration)
can be queried.
It is important that the application always disables the watchdog timer whenever it intends to
stop updating it regularly, such as when the application shuts down — otherwise the system would
be rebooted as soon as the timer expires. The watchdog timer is never disabled automatically.
Finally, the integer Watchdog Failure Count provides information about how many watchdog failure
reboots happened in the device lifetime.
Note that all the watchdog related features are in “guru” feature visibility level.
LvHDevice hDev; // open the device to get the handle
// possibly read number of watchdog failures in device's lifetime
LvGetInt32 (hDev, LvDevice_LvWatchdogFailureCount, &IntVal);
// configure and enable the watchdog timer...
LvSetFloat (hDev, LvDevice_LvWatchdogTimerDuration, 20.0); // in seconds
LvSetBool (hDev, LvDevice_LvWatchdogEnable, 1);
// ...and immediatelly start feeding it with regular reset signals
LvCmdExecute (hDev, LvDevice_LvWatchdogTimerReset);
// the actual value of the watchdog timer can be queried
double FloatVal;
LvGetFloat (hDev, LvDevice_LvWatchdogTimerValue, &FloatVal);
// when not needed any more, disable the watchdog timer
LvSetBool (hDev, LvDevice_LvWatchdogEnable, 0);
// possibly read number of watchdog failures in device's lifetime
read_int (LvWatchdogFailureCount)
// configure and enable the watchdog timer...
write_float (LvWatchdogTimerDuration, 20.0) // in seconds
write_bool (LvWatchdogEnable, true)
// ...and immediatelly start feeding it with regular reset signals
exec_cmd (LvWatchdogTimerReset)
// the actual value of the watchdog timer can be queried
read_float (LvWatchdogTimerValue)
// when not needed any more, disable the watchdog timer
write_bool (LvWatchdogEnable, false)
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