RpiWatchdog Class Reference

Watchdog for the Raspberry PI. More...

#include <rpi_watchdog.h>

Public Member Functions
	RpiWatchdog ()
	Default constructor. More...
void	update ()
	This should be called by the main state machine every 1s. More...
void	resetCountDown ()
	When the UI software on the Raspberry PI sends a heartbeat, reset countdown. More...
void	disable ()
	Disable countdown mode (used for debug) More...

Private Types
enum	RpiWatchdogStep {   COUNT_DOWN , SWITCH_OFF_RASPBERRY , SWITCH_ON_RASPBERRY , WAIT_FOR_FIRST_HEARTBEAT ,   DISABLED }

Private Attributes
int32_t	m_countDown
RpiWatchdogStep	m_rpiWatchdogStep

Detailed Description

Watchdog for the Raspberry PI.

Definition at line 15 of file rpi_watchdog.h.

Member Enumeration Documentation

RpiWatchdogStep

enum RpiWatchdog::RpiWatchdogStep

private

Enumerator
COUNT_DOWN
SWITCH_OFF_RASPBERRY
SWITCH_ON_RASPBERRY
WAIT_FOR_FIRST_HEARTBEAT
DISABLED

Definition at line 31 of file rpi_watchdog.h.

                         {
        COUNT_DOWN,
        SWITCH_OFF_RASPBERRY,
        SWITCH_ON_RASPBERRY,
        WAIT_FOR_FIRST_HEARTBEAT,
        DISABLED
    };

Constructor & Destructor Documentation

RpiWatchdog()

RpiWatchdog::RpiWatchdog

(

)

Default constructor.

Definition at line 20 of file rpi_watchdog.cpp.

                         {
    m_rpiWatchdogStep = COUNT_DOWN;
    m_countDown = COUNTDOWN_IN_S;
}

Member Function Documentation

disable()

void RpiWatchdog::disable

(

)

Disable countdown mode (used for debug)

Definition at line 58 of file rpi_watchdog.cpp.

{ m_rpiWatchdogStep = DISABLED; }

resetCountDown()

void RpiWatchdog::resetCountDown

(

)

When the UI software on the Raspberry PI sends a heartbeat, reset countdown.

Definition at line 50 of file rpi_watchdog.cpp.

                                 {
    if (m_rpiWatchdogStep == WAIT_FOR_FIRST_HEARTBEAT) {
        m_rpiWatchdogStep = COUNT_DOWN;
    }
 
    m_countDown = COUNTDOWN_IN_S;
}

update()

void RpiWatchdog::update

(

)

This should be called by the main state machine every 1s.

Definition at line 25 of file rpi_watchdog.cpp.

                         {
    if (m_rpiWatchdogStep == COUNT_DOWN) {
        m_countDown--;
        if (m_countDown <= 0) {
            m_rpiWatchdogStep = SWITCH_OFF_RASPBERRY;
        }
    } else if (m_rpiWatchdogStep == SWITCH_OFF_RASPBERRY) {
        // Turn off the Raspberry Pi power
        digitalWrite(PIN_ENABLE_PWR_RASP, PWR_RASP_INACTIVE);
        m_rpiWatchdogStep = SWITCH_ON_RASPBERRY;
    } else if (m_rpiWatchdogStep == SWITCH_ON_RASPBERRY) {
        // Turn on the Raspberry Pi power
        digitalWrite(PIN_ENABLE_PWR_RASP, PWR_RASP_ACTIVE);
        m_countDown = COUNTDOWN_IN_S;
        m_rpiWatchdogStep = WAIT_FOR_FIRST_HEARTBEAT;
    } else if (m_rpiWatchdogStep == WAIT_FOR_FIRST_HEARTBEAT) {
        // Do nothing here
        // Next time resetCountDown() is called because a heartbeat was received, let's resume
    } else if (m_rpiWatchdogStep == DISABLED) {
        // Do nothing when watchdog is disabled
    } else {
        // Do nothing
    }
}

Member Data Documentation

m_countDown

int32_t RpiWatchdog::m_countDown

private

Definition at line 30 of file rpi_watchdog.h.

m_rpiWatchdogStep

RpiWatchdogStep RpiWatchdog::m_rpiWatchdogStep

private

Definition at line 38 of file rpi_watchdog.h.

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The documentation for this class was generated from the following files:

• includes/rpi_watchdog.h
• srcs/rpi_watchdog.cpp