[Task] - Test watchdogs

[ladislas]

• https://www.st.com/resource/en/datasheet/stm32f769ai.pdf
• https://os.mbed.com/docs/mbed-os/v5.15/apis/watchdog.html

[YannLocatelli]

Quick example of watchdog using Ticker based on mbed api example

#include "mbed.h"

Ticker kicker;

void watchdogKick()
{
    Watchdog::get_instance().kick();
}

int main()
{
    printf("\n\nDemonstration of watchdog in case of error (happens in 10s).\n");

    const uint32_t TIMEOUT_MS = 5000;
    Watchdog &watchdog = Watchdog::get_instance();
    watchdog.start(TIMEOUT_MS);

    kicker.attach_us(watchdogKick, 1000);
    
    ThisThread::sleep_for(10s);
    error("This is a reason why watchdog exists. Restarting in 5000ms...\n");
    
    return 0;
}