RTC 7 Click

RTC 7 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 or a super capacitor, for an extended period of time.

Click Product page

Click library

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

Software Support

We provide a library for the RTC7 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 RTC7 Click driver.

Standard key functions :

• rtc7_cfg_setup Config Object Initialization function.

  void rtc7_cfg_setup ( rtc7_cfg_t *cfg ); 

• rtc7_init Initialization function.

  err_t rtc7_init ( rtc7_t *ctx, rtc7_cfg_t *cfg );

• rtc7_default_cfg Click Default Configuration function.

  err_t rtc7_default_cfg ( rtc7_t *ctx );

Example key functions :

• rtc7_check_interrupt This function returns the interrupt state, state of INTA pin.

  uint8_t rtc7_check_interrupt ( rtc7_t *ctx );

• rtc7_read_reg This function writes one byte data to the register.

  err_t rtc7_read_reg ( rtc7_t *ctx, uint8_t reg, uint8_t *data_out, uint8_t len );

• rtc7_get_local_time This function gets the local time data including the determined time zone in calculations.

  err_t rtc7_get_local_time ( rtc7_t *ctx, rtc7_time_t *local_time );

Examples Description

This app is used to accurately measure time with low power consumption.

The demo application is composed of two sections :

Application Init

Initializes device.

void application_init ( void )
{
    log_cfg_t log_cfg;
    rtc7_cfg_t 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.
    rtc7_cfg_setup( &cfg );
    RTC7_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    rtc7_init( &rtc7, &cfg );
    Delay_ms ( 300 );

    time_set.seconds = 40;
    time_set.minutes = 59;
    time_set.hours = 23;
    time_set.weekdays = 1;
    time_set.monthday = 31;
    time_set.month = 12;
    time_set.year = 22;

    err_t error_flag = rtc7_reset( &rtc7 );
    error_flag |= rtc7_init_time ( &rtc7, 0 );
    error_flag |= rtc7_set_gmt_time( &rtc7, &time_set );
    error_flag |= rtc7_set_osc( &rtc7, RTC7_ENABLE_OSC, RTC7_INPUT_FREQ_32768HZ, RTC7_OUTPUT_FREQ_32768HZ );
    error_flag |= rtc7_write_reg( &rtc7, RTC7_TIMER_INIT_REG, 15 );
    error_flag |= rtc7_set_timer( &rtc7, RTC7_TIMER_EN, RTC7_TIMER_FREQ_16HZ );
    Delay_ms ( 100 );
    if ( RTC7_ERROR == error_flag )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    log_info( &logger, " Application Task " );
}

Application Task

Waits for a second count-up interrupt and then reads and logs the current time and date on the USB UART.

void application_task ( void )
{
    // Wait for timer count-down interrupt which is set to 1Hz
    while ( rtc7_check_interrupt ( &rtc7 ) );

    // Clear interrupt status
    uint8_t int_status = 0;
    rtc7_read_reg( &rtc7, RTC7_INT_STATUS_REG, &int_status, 1 );

    // Read time
    if ( RTC7_OK == rtc7_get_local_time( &rtc7, &time_date ) )
    {
        // Display time
        rtc7_display_results( &rtc7 );
    }
}

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.RTC7

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.