Compass 4 Click

Compass 4 Click is a compact add-on board that can measure the three-axis magnetic field that is perfect for implementation in applications such as electric compasses.

Click Product page

Click library

• Author : MikroE Team
• Date : Sep 2020.
• Type : I2C/SPI type

Software Support

We provide a library for the Compass4 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Compass4 Click driver.

Standard key functions :

• Config Object Initialization function.

  void compass4_cfg_setup ( compass4_cfg_t *cfg );

• Initialization function.

  COMPASS4_RETVAL compass4_init ( compass4_t ctx, compass4_cfg_t cfg );

Example key functions :

• Gets INT pin state (DRDY pin)

  uint8_t compass4_get_interrupt ( compass4_t *ctx );

• Gets single axis value

  uint8_t compass4_get_single_axis ( compass4_t ctx, uint8_t axis_reg, int16_t axis_data );

• Gets magnetic flux of X\Y\Z axis value

  uint8_t compass4_get_magnetic_flux ( compass4_t ctx, compass4_flux_t flux );

Examples Description

This demo application measures magnetic flux data.

The demo application is composed of two sections :

Application Init

Initializes the driver and resets the module, then checks the communication with the module and sets the module default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;
    compass4_cfg_t cfg;

    uint8_t device;

    /** 
     * 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.

    compass4_cfg_setup( &cfg );
    COMPASS4_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    compass4_init( &compass4, &cfg );

    compass4_hardware_reset( &compass4 );
    Delay_ms ( 500 );

    device = compass4_check_device( &compass4 );
    if ( device == 0 )
    {
        log_printf( &logger, ">> Device communication [ OK ] \r\n" );
    }
    else
    {
        log_printf( &logger, ">> Device communication [ ERROR ] \r\n" );
        for ( ; ; );
    }

    compass4_configuration ( &compass4, COMPASS4_CTRL1_WM_STEPS_5 | 
                                        COMPASS4_CTRL1_NOISE_ENABLE,
                                        COMPASS4_CTRL2_MODE_CONT_1 | 
                                        COMPASS4_CTRL2_SDR_LOW_NOISE |
                                        COMPASS4_CTRL2_FIFO_ENABLE );

    log_printf( &logger, ">> Start measurement  \r\n" );
}

Application Task

Reads magnetic flux data and displays the values of X, Y, and Z axis to the USB UART each second.

void application_task ( void )
{
    compass4_flux_t flux;
    uint8_t err;

    err = compass4_get_magnetic_flux( &compass4, &flux );
    if ( err != 0 )
    {
        log_printf( &logger, ">> Measurement error  \r\n" );
    }
    else
    {
        log_printf( &logger, ">> Magnetic flux data << \r\n" );
        log_printf( &logger, ">> X: %.2f \r\n", flux.x );
        log_printf( &logger, ">> Y: %.2f \r\n", flux.y );
        log_printf( &logger, ">> Z: %.2f \r\n", flux.z );
    }
    log_printf( &logger, "-----------------------------\r\n" );
    Delay_ms ( 1000 );
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Compass4

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.