rtc16  2.0.0.0
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RTC 16 click

RTC 16 Click is a compact add-on board that accurately keeps the time of a day. This board features the BU9873, a CMOS real-time clock that has a built-in interrupt generation function from Rohm Semiconductors. The BU9873 provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768kHz quartz crystal. This RTC is connected to the MCU through an I2C interface and configured to serial transmit time and calendar data. It also has an alarm function that outputs an interrupt signal to the MCU when the day of the week, hour, or minute matches with the preset time.

click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Mar 2022.
  • Type : I2C type

Software Support

We provide a library for the RTC 16 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 RTC 16 Click driver.

Standard key functions :

Example key functions :

Example Description

This example demonstrates the use of RTC 16 click board by reading and displaying the time and date values.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger and performs the click default configuration which sets 24h time mode and interrupt to be synchronized with second count-up.

And after that setting the starting time and date.

void application_init ( void )
{
log_cfg_t log_cfg;
rtc16_cfg_t rtc16_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
rtc16_cfg_setup( &rtc16_cfg );
RTC16_MAP_MIKROBUS( rtc16_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == rtc16_init( &rtc16, &rtc16_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( RTC16_ERROR == rtc16_default_cfg ( &rtc16 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
time.hour = 23;
time.minute = 59;
time.second = 50;
if ( RTC16_OK == rtc16_set_time ( &rtc16, &time ) )
{
log_printf( &logger, " Set time: %.2u:%.2u:%.2u\r\n",
( uint16_t ) time.hour, ( uint16_t ) time.minute, ( uint16_t ) time.second );
}
date.day_of_week = RTC16_SUNDAY;
date.day = 31;
date.month = 12;
date.year = 22;
if ( RTC16_OK == rtc16_set_date ( &rtc16, &date ) )
{
log_printf( &logger, " Set date: %s, %.2u.%.2u.20%.2u.\r\n",
rtc16_get_day_of_week_name ( date.day_of_week ),
( uint16_t ) date.day, ( uint16_t ) date.month, ( uint16_t ) date.year );
}
log_info( &logger, " Application Task " );
}

Application Task

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

void application_task ( void )
{
// Wait for interrupt which is synchronized with second count-up
while ( rtc16_get_int_pin ( &rtc16 ) );
if ( RTC16_OK == rtc16_read_time ( &rtc16, &time ) )
{
log_printf( &logger, " Time: %.2u:%.2u:%.2u\r\n",
( uint16_t ) time.hour, ( uint16_t ) time.minute, ( uint16_t ) time.second );
}
if ( RTC16_OK == rtc16_read_date ( &rtc16, &date ) )
{
log_printf( &logger, " Date: %s, %.2u.%.2u.20%.2u.\r\n\n",
rtc16_get_day_of_week_name ( date.day_of_week ),
( uint16_t ) date.day, ( uint16_t ) date.month, ( uint16_t ) date.year );
}
}

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.RTC16

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.


RTC16_MAP_MIKROBUS
#define RTC16_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: rtc16.h:175
rtc16_read_time
err_t rtc16_read_time(rtc16_t *ctx, rtc16_time_t *time)
RTC 16 read time function.
rtc16_clear_interrupts
err_t rtc16_clear_interrupts(rtc16_t *ctx)
RTC 16 clear interrupts function.
RTC16_OK
@ RTC16_OK
Definition: rtc16.h:249
rtc16_init
err_t rtc16_init(rtc16_t *ctx, rtc16_cfg_t *cfg)
RTC 16 initialization function.
rtc16_set_time
err_t rtc16_set_time(rtc16_t *ctx, rtc16_time_t *time)
RTC 16 set time function.
RTC16_SUNDAY
#define RTC16_SUNDAY
Definition: rtc16.h:144
rtc16_set_date
err_t rtc16_set_date(rtc16_t *ctx, rtc16_date_t *date)
RTC 16 set date function.
rtc16_read_date
err_t rtc16_read_date(rtc16_t *ctx, rtc16_date_t *date)
RTC 16 read date function.
application_task
void application_task(void)
Definition: main.c:99
rtc16_t
RTC 16 Click context object.
Definition: rtc16.h:188
RTC16_ERROR
@ RTC16_ERROR
Definition: rtc16.h:250
rtc16_get_int_pin
uint8_t rtc16_get_int_pin(rtc16_t *ctx)
RTC 16 get int pin function.
rtc16_cfg_t
RTC 16 Click configuration object.
Definition: rtc16.h:205
rtc16_time_t
RTC 16 Click time object.
Definition: rtc16.h:222
application_init
void application_init(void)
Definition: main.c:44
rtc16_date_t
RTC 16 Click date object.
Definition: rtc16.h:235
rtc16_default_cfg
err_t rtc16_default_cfg(rtc16_t *ctx)
RTC 16 default configuration function.
rtc16_cfg_setup
void rtc16_cfg_setup(rtc16_cfg_t *cfg)
RTC 16 configuration object setup function.