heartrate4

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Heart rate 4 Click

Heart rate 4 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : MikroE Team
• Date : Feb 2020.
• Type : I2C type

Software Support

Example Description

This example demonstrates the use of Heart rate 4 Click board.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.HeartRate4

Example Key Functions

• heartrate4_cfg_setup Config Object Initialization function.

void heartrate4_cfg_setup ( heartrate4_cfg_t *cfg );

• heartrate4_init Initialization function.

err_t heartrate4_init ( heartrate4_t *ctx, heartrate4_cfg_t *cfg );

• heartrate4_default_cfg Click Default Configuration function.

void heartrate4_default_cfg ( heartrate4_t *ctx );

• heartrate4_get_intrrupt Function is used to read desired interrupt specified by flag.

uint8_t heartrate4_get_intrrupt ( heartrate4_t *ctx, uint8_t flag );

• heartrate4_get_red_val Function is used to read the oldest RED value.

uint32_t heartrate4_get_red_val ( heartrate4_t *ctx );

• heartrate4_enable_slot Function is used to determine which LED is active in each time slot.

void heartrate4_enable_slot ( heartrate4_t *ctx, uint8_t slot_num, uint8_t dev );

Application Init

Initalizes I2C driver, applies default settings, and makes an initial log.

void application_init ( void )
{
    log_cfg_t log_cfg;
    heartrate4_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.

    heartrate4_cfg_setup( &cfg );
    HEARTRATE4_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    heartrate4_init( &heartrate4, &cfg );

    Delay_ms ( 100 );
    heartrate4_default_cfg( &heartrate4 );
    Delay_ms ( 100 );
}

Application Task

Reads data from Red diode and displays the results on USB UART if the measured data is above defined threshold, otherwise, it displays desired message on the terminal.

void application_task ( void )
{
    if ( heartrate4_get_intrrupt( &heartrate4, 1 ) & 0x40 )
    {
        red_samp = heartrate4_get_red_val( &heartrate4 );
        counter++;
        
        // If sample pulse amplitude is not under threshold value 0x8000
        if ( red_samp > 0x8000 )
        {
            log_printf( &logger, "%lu\r\n", red_samp );
            Delay_ms ( 1 );
            counter = 200;
        }
        else if ( counter > 200 )
        {
            log_printf( &logger, "Place Finger On Sensor\r\n" );
            Delay_ms ( 100 );
            counter = 0;
        }
    }
}

Note

    MCU              : STM32F107VCT6
    Dev. Board       : Fusion for ARM v8

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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