Library Description

Library provides a full contol over Heart Rate 2 click. It provides generic functions for reading and writing, default configuration and reading fifo data, and if you are willing you can set your configuration.

Key functions:

• uint8_t heartrate2_generic_read ( uint8_t reg_adr ) - Generic function for reading data.
• void heartrate2_generic_write ( uint8_t reg_adr, uint8_t write_data ) - Generic function for writing data.
• void heartrate2_default_configuration ( uint8_t cfg_led ) - Function for setting default config and turning on one led with cfg_led parameter.
• void heartrate2_read_fifo ( heartrate2_fifo_data_t *fifo ) - Function for reading fifo data and tag values from device.

Examples description

The application is composed of three sections :

• System Initialization - Initialization of I2C module and additional pins
• Application Initialization - Resets device, checks ID and configures device to desired led
• Application Task - Reading fifo data and logs it with time

void application_task ( )
{
    char demo_txt[ 30 ];
    heartrate2_fifo_data_t fifo_object;

    heartrate2_read_fifo( &fifo_object );

    if ( fifo_object.tag == HEARTRATE2_FIFO_TAG_PPG1_LEDC1 )
    {
        LongWordToStr( fifo_object.data_val, demo_txt );
        Ltrim( demo_txt );
        Rtrim( demo_txt );
        mikrobus_logWrite( demo_txt, _LOG_TEXT );
        mikrobus_logWrite( ",", _LOG_TEXT );
        LongWordToStr( counter_tm++, demo_txt );
        Ltrim( demo_txt );
        Rtrim( demo_txt );
        mikrobus_logWrite( demo_txt, _LOG_LINE );
    }
    
    Delay_ms( 4 );
}

Other mikroE Libraries used in the example:

• I2C
• UART
• Conversions

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.