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mikroSDK Library

GeoMagnetic click

Rating:

5

Author: MikroElektronika Team

Last Updated: 2018-11-06

Category: Magnetic

Downloaded: 1653 times

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License: MIT license  

GeoMagnetic click is a digital magnetometric click board which can measure the geomagnetic field in three perpendicular axes.

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mikroSDK Library Blog

GeoMagnetic click

GeoMagnetic click

Native view of the GeoMagnetic click board.

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GeoMagnetic click

GeoMagnetic click

Front and back view of the GeoMagnetic click board.

View full image

Library Description

Initializes and defines the SPI and I2C bus driver and driver functions, witch have ability to writting on registers and reading from registers. The functions also offer a choice to reading x, y and z axis data and hall resistance data when data is ready for reading. For more details check the documentation.

Key functions:

GEOMAG_RETVAL_T geomag_writeReg( uint8_t dataIn, const uint8_t registerAddress ) - Function writes one byte data in register.

GEOMAG_RETVAL_T geomag_readReg( uint8_t *dataOut, const uint8_t registerAddress, const uint8_t nBytes ) - Function reads determined number of bytes from registers.

void geomag_readData( uint16_t *dataX, uint16_t *dataY, uint16_t *dataZ, uint16_t *resHall ) - Function reads 13-bit x and y axis data, 15-bit z axis data and 14-bit hall resistance data from data registers.

Examples Description

  • The application is composed of three sections:
  • System Initialization - Initializes peripherals and pins.
  • Application Initialization - Initializes SPI driver, performs power on reset and configures device so that all channels (x, y and z) is enabled and Data Ready bit is active on high (Data Ready bit must be configured that is active on high).

Application Task - (code snippet) - Reads axis data after each 500ms and logs results on USB UART.

void applicationTask()
{
 geomag_readData( &axisX, &axisY, &axisZ, &RHall );
 WordToStr( axisX, text );
 mikrobus_logWrite( "X axis: ", _LOG_TEXT );
 mikrobus_logWrite( text, _LOG_LINE );
 WordToStr( axisY, text );
 mikrobus_logWrite( "Y axis: ", _LOG_TEXT );
 mikrobus_logWrite( text, _LOG_LINE );
 WordToStr( axisZ, text );
 mikrobus_logWrite( "Z axis: ", _LOG_TEXT );
 mikrobus_logWrite( text, _LOG_LINE );
 mikrobus_logWrite( "", _LOG_LINE );
 Delay_ms( 500 );
}

Other mikroE Libraries used in the example:

  • Conversions
  • SPI
  • UART

Additional notes and information

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.

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