Beginner
10 min

Achieve precise timing and synchronization with DS1682 and STM32F030R8

Countdown to excellence

TIMER Click with Nucleo-64 with STM32F030R8 MCU

Published Feb 26, 2024

Click board™

TIMER Click

Dev Board

Nucleo-64 with STM32F030R8 MCU

Compiler

NECTO Studio

MCU

STM32F030R8

Take control of your time with a powerful countdown timer

A

A

Hardware Overview

How does it work?

Timer Click is based on the DS1682, a total-elapsed-time recorder with an alarm from Analog Devices. This IC is an integrated ETC, factory-calibrated, and temperature-compensated RC time base, accurate to 2% (typical), eliminating the need for an external crystal. The DS1682 can detect and record the number of events and the total cumulative event time since the last reset to 0. After the Power-Up sequence, the data is transferred from the EEPROM into the counters and registers where data can be read and written. The data from the counters and registers are written to the EEPROM when the event occurs.

The Timer Click communicates with the host microcontroller using the standard I2C 2-Wire interface to read data and configure settings, supporting Standard mode (100KHz) and Fast mode (400KHz) operation. The event EVT pin is the input pin of the DS1682 and monitors when an event occurs. With logic HIGH on this pin, the contents from the EEPROM are transferred to the ETC, and the ETC counter starts to count in quarter-second increments. With logic LOW, event counter increments and the data are stored in the EEPROM array. When the EVT pin changes states, the I2C is unavailable for communications. The

ALM is an alarm output pin and is active LOW. When the ETC matches the alarm value, the alarm flag (AF) is set, and once set, it can not be reset. The alarm flag is one-time programmable. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

TIMER Click top side image
TIMER Click bottom side image

Features overview

Development board

Nucleo-64 with STM32F030R8 MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin

headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is

provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.

Nucleo 64 with STM32F030R8 MCU double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

ARM Cortex-M0

MCU Memory (KB)

64

Silicon Vendor

STMicroelectronics

Pin count

64

RAM (Bytes)

8192

You complete me!

Accessories

Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.

Click Shield for Nucleo-64 accessories 1 image

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
RST
Event Detection
PB12
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
Alarm Interrupt
PC14
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PB8
SCL
I2C Data
PB9
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

TIMER Click Schematic schematic

Step by step

Project assembly

Click Shield for Nucleo-64 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Nucleo-64 with STM32F030R8 MCU as your development board.

Click Shield for Nucleo-64 front image hardware assembly
Nucleo 64 with STM32F401RE MCU front image hardware assembly
EEPROM 13 Click front image hardware assembly
Prog-cut hardware assembly
Nucleo-64 with STM32XXX MCU MB 1 Mini B Conn - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Clicker 4 for STM32F4 HA MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output via Debug Mode

1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.

2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.

DEBUG_Application_Output

Software Support

Library Description

This library contains API for TIMER Click driver.

Key functions:

  • timer_get_etc_data - Get elapsed time counter (ETC) data function

  • timer_get_etc_seconds - Get elapsed time counter (ETC) seconds function

  • timer_get_time - Set elapsed time counter (ETC) time function

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * \file 
 * \brief Timer Click example
 * 
 * # Description
 * This application is multifunctional 3-axis digital accelerometer that can also be configured as a 45-degree Tilt sensor.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initialization driver enable's - I2C,
 * soft reset, sets ETC and EC start ( seconds ), hardwere reset and start write log.
 * 
 * ## Application Task  
 * This is a example which demonstrates the use of Timer Click board.
 * Timer Click communicates with register via I2C by write to register and read from register,
 * display time ( days, hours, minutes and seconds ) which we received reading from the target register address of DS1682 total elapsed time recorder.
 * Results are being sent to the Usart Terminal where you can track their changes.
 * All data logs write on usb uart changes for every 1 sec.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "timer.h"

// ------------------------------------------------------------------ VARIABLES

static timer_t timer;
static log_t logger;
static uint8_t time_seconds_new;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    timer_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.

    timer_cfg_setup( &cfg );
    TIMER_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    timer_init( &timer, &cfg );
    Delay_ms( 200 );

    log_printf( &logger, "   Driver  Init   \r\n" );
    log_printf( &logger, "------------------\r\n" );
    log_printf( &logger, "    Soft Reset    \r\n" );
    
    timer_soft_reset( &timer );
    Delay_ms( 500 );
    
    log_printf( &logger, "------------------\r\n" );
    log_printf( &logger, "  Set ETC and EC  \r\n" );
    
    timer_set_etc_seconds( &timer, 86390 );
    timer_set_ec_seconds( &timer, 0 );
    
    log_printf( &logger, "------------------\r\n" );
    log_printf( &logger, "  Hardwere Reset  \r\n" );
    
    timer_hw_reset( &timer );
    Delay_ms( 500 );
    
    log_printf( &logger, "------------------\r\n" );
    log_printf( &logger, "        ETC       \r\n" );
    log_printf( &logger, "------------------\r\n" );
    
    time_seconds_new = 0xFF;
}

void application_task ( )
{
    uint8_t time_hours;
    uint8_t time_minutes;
    uint8_t time_seconds;
    uint16_t time_days;

    timer_get_time( &timer, &time_days, &time_hours, &time_minutes, &time_seconds );
   
    if ( time_seconds_new != time_seconds )
    {
        log_printf
        ( 
            &logger, " %d days    %d:%d:%d \r\n", 
            (uint16_t)time_days, 
            (uint16_t)time_hours, 
            (uint16_t)time_minutes, 
            (uint16_t)time_seconds
        );
        log_printf( &logger, "------------------\r\n" );
        time_seconds_new = time_seconds;
    }
    Delay_ms( 1 );
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}


// ------------------------------------------------------------------------ END

Additional Support

Resources

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