The Components::Watchdog component provides the mechanism to "pet" the physical watchdog circuit on the PROVES FC Board and provides a visual indicator by blinking an LED at a fixed interval. The component is driven by a rate group and oscillates the watchdog GPIO every rategroup tick.
2. Requirements
The requirements for Components::Watchdog are as follows:
Requirement
Description
Verification Method
Verified?
WD-001
The Components::Watchdog component shall activate upon startup.
Inspection
Yes
WD-002
The Components::Watchdog component shall oscillate the watchdog GPIO pin (24) on/off on each rategroup tick.
Inspection
Yes
WD-003
The Components::Watchdog component shall provide telemetry for watchdog transition count.
Integration Test
Yes
WD-004
The Components::Watchdog component shall respond to stop signals to halt the watchdog.
Integration Test
Yes
WD-005
The Components::Watchdog component shall provide a test command to stop the watchdog.
Integration Test
Yes
WD-006
The Components::Watchdog component shall emit an event when the watchdog stops.
Integration Test
Yes
WD-007
The Components::Watchdog component shall provide a test command to start the watchdog.
Integration Test
Yes
WD-008
The Components::Watchdog component shall emit an event when the watchdog starts.
Integration Test
Yes
3. Design
3.1 Context
3.1.1 Component Diagram
The Components::Watchdog component has the following component diagram:
3.1.2 Ports
Port Data Type
Name
Direction
Kind
Usage
[Svc::Sched]
run
Input
Synchronous
Receive periodic calls from rate group
[Fw::Signal]
start
Input
Synchronous
Receive start signal to start watchdog
[Fw::Signal]
stop
Input
Synchronous
Receive stop signal to stop watchdog
[Drv::GpioWrite]
gpioSet
Output
n/a
Control GPIO state through driver
3.1.3 Commands
Name
Kind
Description
START_WATCHDOG
Synchronous
calls the port start_runhandler to start the watchdog.
STOP_WATCHDOG
Synchronous
calls the port stop_runhandler to stop the watchdog.
3.1.4 Events
Name
Description
WatchdogStart
Emits once the watchdog has started.
WatchdogStop
Emits once the watchdog has stopped.
3.1.5 Telemetry
Name
Type
Description
WatchdogTransitions
U32
Number of times the GPIO has oscillated from on/off during watchdog petting
