Watchdog Click

Watchdog Click is a compact add-on board that contains a simple countdown timer for a wide variety of applications. This board features the TPS3430, a standalone watchdog timer with a programmable watchdog window and programmable reset delay from Texas Instruments.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Sep 2021.
• Type : GPIO type

Software Support

We provide a library for the Watchdog Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Watchdog Click driver.

Standard key functions :

• watchdog_cfg_setup Config Object Initialization function.

  void watchdog_cfg_setup ( watchdog_cfg_t *cfg );

• watchdog_init Initialization function.

  err_t watchdog_init ( watchdog_t *ctx, watchdog_cfg_t *cfg );

• watchdog_default_cfg Click Default Configuration function.

  err_t watchdog_default_cfg ( watchdog_t *ctx );

Example key functions :

• watchdog_set_set0 Set S0 ( RST ) pin state function.

  void watchdog_set_set0 ( watchdog_t *ctx, uint8_t set0_state );

• watchdog_get_wdo Get WDO ( INT ) pin state function.

  uint8_t watchdog_get_wdo ( watchdog_t *ctx );

• watchdog_send_pulse Send pulse function.

  void watchdog_send_pulse ( watchdog_t *ctx, uint16_t p_duration_ms );

Example Description

This is an example that demonstrates the use of the Watchdog Click board.

The demo application is composed of two sections :

Application Init

Initialization driver enables - GPIO, configure the watchdog window, enable watchdog, also write log.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    watchdog_cfg_t watchdog_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    watchdog_cfg_setup( &watchdog_cfg );
    WATCHDOG_MAP_MIKROBUS( watchdog_cfg, MIKROBUS_1 );
    if ( DIGITAL_OUT_UNSUPPORTED_PIN == watchdog_init( &watchdog, &watchdog_cfg ) ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
    watchdog_default_cfg ( &watchdog );

    log_printf( &logger, "---------------------\r\n" );
    log_printf( &logger, "   Configure of the  \r\n" );
    log_printf( &logger, "   watchdog window   \r\n" );
    watchdog_setup_time( &watchdog, WATCHDOG_SETUP_TIME_MODE_2 );
    Delay_ms ( 1000 );

    log_printf( &logger, "---------------------\r\n" );
    log_printf( &logger, "   Watchdog enabled  \r\n" );
    log_printf( &logger, "---------------------\r\n" );
    Delay_ms ( 1000 );

    log_info( &logger, " Application Task " );
}

Application Task

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 ( void ) 
{
    log_printf( &logger, "  Correct Operation  \r\n" );
    uint8_t n_cnt = 40;
    while ( n_cnt > 0 ) {
        watchdog_send_pulse( &watchdog, 1 );
        Delay_ms ( 50 );
        n_cnt--;
    }
    log_printf( &logger, "---------------------\r\n" );

    log_printf( &logger, "        Fault        \r\n" );
    n_cnt = 8;
    while ( n_cnt > 0 ) {
        watchdog_send_pulse( &watchdog, 1 );
        Delay_ms ( 250 );
        n_cnt--;
    }
    log_printf( &logger, "---------------------\r\n" );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Watchdog

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. UART terminal is available in all MikroElektronika compilers.