Library Description

The library covers all the necessary functions to control the Watchdog click board.

Key functions:

• void watchdog_send_pulse ( uuint16_t p_duration_ms ) - Send pulse function.
• void watchdog_setup_time ( uint8_t setup_time_mode ) - Set the watchdog time function.
• void watchdog_reset_time ( void ) - Reset time function.

Examples description

The application is composed of three sections :

• System Initialization - Initializes GPIO, set RST, CS and PWM pin as outputs,
   set INT pin as input and begins to write log.
• Application Initialization - Initialization driver enables - GPIO,
   configure the watchdog window, enable watchdog and init. Timer Interrupt,
   also write log.
• Application Task - (code snippet) This is an example that demonstrates the use of the Watchdog click board. In the first part of the example, we send pulses in a valid time window (Correct Operation). The second part of the example sends pulses outside the valid time window and then the watchdog detects a fault condition, display "Fault", performs the reset and turn on the LED ( WDT FLT ) on the Watchdog click board. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( )
{
    watchdog_reset_time( );
    watchdog_set_config( 50, 5 );

    n_cnt = 100;
    while ( n_cnt > 0 )
    {
        if ( watchdog_get_wdo( ) != 0 )
        {
            mikrobus_logWrite( "  Correct Operation  ", _LOG_LINE );
            Delay_ms( 1 );
            n_cnt--;
        }
    }
    mikrobus_logWrite( "---------------------", _LOG_LINE );

    watchdog_reset_time( );
    watchdog_set_config( 120, 1 );

    n_cnt = 50;
    while ( n_cnt > 0 )
    {
        if ( watchdog_get_wdo( ) == 0 )
        {
            mikrobus_logWrite( "        Fault        ", _LOG_LINE );
            Delay_ms( 1 );
            n_cnt--;
        }
    }
    mikrobus_logWrite( "---------------------", _LOG_LINE );
}

Other mikroE Libraries used in the example:

• GPIO
• UART

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.