Library Description

The library covers all the necessary functions that enables the usage of the Heart rate 4 Click board. It initializes and defines the I2C bus driver and drivers that offer a choice for writing and reading and setting a new value.

Key functions:

• void heartrate3_defaultConfig() - Function is used to apply the default configuration.
• uint32_t heartrate3_readLed2ValReg() - Function is used to read from LED2VAL register.
• uint32_t heartrate3_readAled2ValReg() - Function is used to read from ALED2VAL register.

Examples description

The application is composed of three sections :

• System Initialization - Initializes I2C module, LOG and GPIO structures, sets INT pin as input and RST and PWM pins as output.
• Application Initialization - Initalizes I2C driver, applies default settings, and makes an initial log.
• Application Task - This example demonstrates the use of Heart rate 3 board. It is set in default mode, and reads reflected red, green and ir values and displays the results on USART terminal.

void applicationTask()
{
    led2Val = heartrate3_readLed2ValReg();
    LongToStr( led2Val, logTxt );
    mikrobus_logWrite( logTxt, _LOG_LINE );

    aled2Val = heartrate3_readAled2ValReg();
    LongToStr( aled2Val, logTxt );
    mikrobus_logWrite( logTxt, _LOG_LINE );

    led1Val = heartrate3_readLed1ValReg();
    LongToStr( led1Val, logTxt );
    mikrobus_logWrite( logTxt, _LOG_LINE );

    aled1Val = heartrate3_readAled1ValReg();
    LongToStr( aled1Val, logTxt );
    mikrobus_logWrite( logTxt, _LOG_LINE );

    led2Aled2Val = heartrate3_readLed2Aled2ValReg();
    LongToStr( led2Aled2Val, logTxt );
    mikrobus_logWrite( logTxt, _LOG_LINE );

    led1Aled1Val = heartrate3_readLed1Aled1ValReg();
    LongToStr( led1Aled1Val, logTxt );
    mikrobus_logWrite( logTxt, _LOG_LINE );

    mikrobus_logWrite( "----------------------", _LOG_LINE );
    Delay_ms( 100 );
}

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.