RTC 8 click

RTC 8 click is a real time clock module which has an extremely low power consumption, allowing it to be used with a single button cell battery, for an extended period of time.

click Product page

Click library

• Author : MikroE Team
• Date : okt 2019.
• Type : I2C type

Software Support

We provide a library for the Rtc8 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Rtc8 Click driver.

Standard key functions :

• rtc8_cfg_setup Config Object Initialization function.

  void rtc8_cfg_setup ( rtc8_cfg_t *cfg ); 

• rtc8_init Initialization function.

  err_t rtc8_init ( rtc8_t *ctx, rtc8_cfg_t *cfg );

• rtc8_default_cfg Click Default Configuration function.

  err_t rtc8_default_cfg ( rtc8_t *ctx );

Example key functions :

• rtc8_set_time Set new time - 24 hour format

  err_t rtc8_set_time ( rtc8_t *ctx, rtc8_time_t *time_s );

• rtc8_set_date Set new date

  err_t rtc8_set_date ( rtc8_t *ctx, rtc8_date_t *date_s );

• rtx8_get_time_and_date Get RTC data ( Time and Data )

  err_t rtx8_get_time_and_date ( rtc8_t *ctx, rtc8_time_t *time_s, rtc8_date_t *date_s );

Examples Description

Demo application shows the operation of RTC 8 clicks.

The demo application is composed of two sections :

Application Init

Configuring clicks and log objects. Settings the click in the default configuration. Sets new: Time, Date, UNIX time and alarm data.

void application_init ( void )
{
    log_cfg_t log_cfg;
    rtc8_cfg_t rtc8_cfg;

    /** 
     * 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.
    rtc8_cfg_setup( &rtc8_cfg );
    RTC8_MAP_MIKROBUS( rtc8_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == rtc8_init( &rtc8, &rtc8_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( RTC8_ERROR == rtc8_default_cfg ( &rtc8 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    // 24h format - HH,MM,SS
    time_s.hours = 23;
    time_s.minutes = 59;
    time_s.seconds = 50;

    rtc8_set_time( &rtc8, &time_s );

    // Set date format
    date_s.weekdays = 5;
    date_s.day = 31;
    date_s.month = 12;
    date_s.year = 22;

    rtc8_set_date( &rtc8, &date_s );

    // Set UNIX time
    rtc8_set_unix_time( &rtc8, 1672527590ul );

    // Set alarm format
    alarm_s.weekdays = 6;
    alarm_s.hours = 0;
    alarm_s.minutes = 0;

    rtc8_set_alarm( &rtc8, &alarm_s );

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

Application Task

Read current Time, Date and UNIX time and checks if the alarm is active.

void application_task ( void )
{
    static uint8_t time_seconds = 0xFF;
    uint8_t alarm = 0;
    uint32_t unix_time = 0;

    err_t error_flag = rtx8_get_time_and_date( &rtc8, &time_s, &date_s );
    error_flag |= rtc8_get_uinx_time( &rtc8, &unix_time );
    error_flag |= rtc8_get_alarm_flag( &rtc8, &alarm );

    if ( ( RTC8_OK == error_flag ) && ( time_seconds != time_s.seconds ) )
    {
        display_weekday ( date_s.weekdays );
        log_printf( &logger, " Time: %.2u:%.2u:%.2u\r\n Date: %.2u.%.2u.20%.2u.\r\n", 
                    ( uint16_t ) time_s.hours, ( uint16_t ) time_s.minutes,
                    ( uint16_t ) time_s.seconds, ( uint16_t ) date_s.day, 
                    ( uint16_t ) date_s.month, ( uint16_t ) date_s.year );
        log_printf( &logger, " UNIX: %lu\r\n", unix_time );
        if ( RTC8_ALARM_IS_ACTIVE == alarm )
        {
            log_info( &logger, " Alarm Activated!!! " );
            rtc8_reset_alarm_flag( &rtc8 );
        }
        log_printf( &logger, "------------------\r\n" );
        time_seconds = time_s.seconds;
    }
    Delay_ms ( 200 );
}

Note

Comment out the lines for setting date and time if you would like the module to keep counting time after a reset or shut down.

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Rtc8

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.