compass3  2.0.0.0
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Compass 3 click

Compass 3 Click is an expansion board that can measure the three-axis magnetic field which is perfect for implementation in applications such as electric compasses. This board features MMC5883MA, a complete 3-axis magnetic sensor with signal processing from MEMSIC.

click Product page


Click library

  • Author : Jovan Stajkovic
  • Date : Jan 2020.
  • Type : I2C type

Software Support

We provide a library for the Compass3 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 Compass3 Click driver.

Standard key functions :

  • Config Object Initialization function.

    void compass3_cfg_setup ( compass3_cfg_t *cfg );

  • Initialization function.

    COMPASS3_RETVAL compass3_init ( compass3_t *ctx, compass3_cfg_t *cfg );

  • Click Default Configuration function.

    void compass3_default_cfg ( compass3_t *ctx );

Example key functions :

  • Measures magnetic field surrounding the device.

    void compass3_full_measurement ( compass3_t *ctx, float *x_val, float *y_val, float *z_val );

  • Function is used to measure temperature.

    float compass3_read_temp ( compass3_t *ctx );

  • Function checks interrupt occurence.

    uint8_t compass3_check_int ( compass3_t *ctx );

Examples Description

This demoapp measures the magnetic field surrounding the device.

The demo application is composed of two sections :

Application Init

Initalizes I2C driver and click driver, performs check, applies default setup and writes an initial log.

void application_init ( void )
{
log_cfg_t log_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_printf( &logger, "---- Application Init ----\r\n" );
// Click initialization.
COMPASS3_MAP_MIKROBUS( cfg, MIKROBUS_1 );
compass3_init( &compass3, &cfg );
Delay_ms ( 100 );
compass3_generic_read( &compass3, COMPASS3_DEVICE_ID, &test_val, 1 );
if ( test_val == COMPASS3_DEVICE_ID_NUM )
{
log_printf( &logger, "--------------------\r\n" );
log_printf( &logger, " Compass 3 click \r\n" );
log_printf( &logger, "--------------------\r\n" );
}
else
{
log_printf( &logger, " Fatal error!!! \r\n" );
for ( ; ; );
}
compass3_default_cfg ( &compass3 );
Delay_ms ( 100 );
}

Application Task

This example demonstrates the use of Compass 3 Click board by measuring the magnetic field surrounding the device.

void application_task ( void )
{
if ( compass3_check_int( &compass3 ) == COMPASS3_INTERRUPT )
{
compass3_full_measurement ( &compass3, &x_val, &y_val, &z_val );
log_printf( &logger," X-axis : %2.f mG\r\n", x_val );
log_printf( &logger," Y-axis : %2.f mG\r\n", y_val );
log_printf( &logger," Z-axis : %2.f mG\r\n", z_val );
Delay_ms ( 1000 );
log_printf( &logger, "--------------------\r\n" );
}
}

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.Compass3

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.


compass3_cfg_t
Click configuration structure definition.
Definition: compass3.h:229
compass3_full_measurement
void compass3_full_measurement(compass3_t *ctx, float *x_val, float *y_val, float *z_val)
Full measurement function.
application_task
void application_task(void)
Definition: main.c:81
COMPASS3_DEVICE_ID_NUM
#define COMPASS3_DEVICE_ID_NUM
Definition: compass3.h:196
COMPASS3_MAP_MIKROBUS
#define COMPASS3_MAP_MIKROBUS(cfg, mikrobus)
Definition: compass3.h:66
COMPASS3_INTERRUPT
#define COMPASS3_INTERRUPT
Definition: compass3.h:188
compass3_init
COMPASS3_RETVAL compass3_init(compass3_t *ctx, compass3_cfg_t *cfg)
Initialization function.
compass3_default_cfg
void compass3_default_cfg(compass3_t *ctx)
Click Default Configuration function.
COMPASS3_DEVICE_ID
#define COMPASS3_DEVICE_ID
Definition: compass3.h:107
compass3_cfg_setup
void compass3_cfg_setup(compass3_cfg_t *cfg)
Config Object Initialization function.
compass3_generic_read
void compass3_generic_read(compass3_t *ctx, uint8_t reg, uint8_t *data_buf, uint8_t len)
Generic read function.
application_init
void application_init(void)
Definition: main.c:38
compass3_check_int
uint8_t compass3_check_int(compass3_t *ctx)
Check interrupt function.