Accel 28 Click

Accel 28 Click is a compact add-on board that contains an acceleration sensor. This board features the LIS2HH12TR, an ultra-low-power high-performance three-axis accelerometer from STMicroelectronics. It allows selectable full-scale acceleration measurements in ranges of ±2g, ±4g, and ±8g in three axes with a configurable host interface that supports both SPI and I2C serial communication.

Click Product page

Click library

• Author : Stefan Ilic
• Date : May 2023.
• Type : I2C/SPI type

Software Support

We provide a library for the Accel 28 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 from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Accel 28 Click driver.

Standard key functions :

• accel28_cfg_setup Config Object Initialization function.

  void accel28_cfg_setup ( accel28_cfg_t *cfg );

• accel28_init Initialization function.

  err_t accel28_init ( accel28_t *ctx, accel28_cfg_t *cfg );

• accel28_default_cfg Click Default Configuration function.

  err_t accel28_default_cfg ( accel28_t *ctx );

Example key functions :

• accel28_get_data Accel 28 data reading function.

  err_t accel28_get_data ( accel28_t *ctx, accel28_data_t *data_out );

• accel28_write_reg Accel 28 register data writing function.

  err_t accel28_write_reg ( accel28_t *ctx, uint8_t reg, uint8_t data_in );

• accel28_sw_reset Accel 28 SW reset function.

  err_t accel28_sw_reset ( accel28_t *ctx );

Example Description

This example demonstrates the use of Accel 28 Click board by reading and displaying the accelerometer data (X, Y, and Z axis).

The demo application is composed of two sections :

Application Init

Initializes the driver, performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    accel28_cfg_t accel28_cfg;  /**< Click config object. */

    /** 
     * 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.
    accel28_cfg_setup( &accel28_cfg );
    ACCEL28_MAP_MIKROBUS( accel28_cfg, MIKROBUS_1 );
    err_t init_flag = accel28_init( &accel28, &accel28_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    uint8_t id_data = 0;

    accel28_generic_read( &accel28, ACCEL28_REG_WHO_AM_I, &id_data, 1 );
    if ( ACCEL28_WHO_AM_I_VALUE != id_data )
    {
        log_error( &logger, " Communication error." );
        for ( ; ; );
    }

    if ( ACCEL28_ERROR == accel28_default_cfg ( &accel28 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Reads and displays on the USB UART the accelerometer data (X, Y, and Z axis) when it is available.

void application_task ( void )
{
    err_t error_flag = ACCEL28_OK;
    if ( ACCEL28_PIN_STATE_HIGH == accel28_get_int_state( &accel28 ) )
    {
        uint8_t tmp_data;
        error_flag = accel28_read_reg( &accel28, ACCEL28_REG_STATUS, &tmp_data );
         if ( ( tmp_data & ACCEL28_STATUS_ZYX_DATA_AVL ) && ( ACCEL28_OK == error_flag ) )
        {
            error_flag = accel28_get_data( &accel28, &accel_data );
            if ( ACCEL28_OK == error_flag )
            {
                log_printf( &logger, " X-axis %.2f mg\r\n", accel_data.x_data );
                log_printf( &logger, " Y-axis %.2f mg\r\n", accel_data.y_data );
                log_printf( &logger, " Z-axis %.2f mg\r\n", accel_data.z_data );
                log_printf( &logger, " = = = = = = = = = = = = = =\r\n" );
            }
        }
    }
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Accel28

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. UART terminal is available in all MikroElektronika compilers.