I2C Extend 2 Click

I2C Extend 2 Click is a compact add-on board suitable for I2C communication bus extension. This board features the PCA9615, a 2-channel multipoint differential I2C bus buffer with hot-swap logic from NXP Semiconductors. The PCA9615 converts the two default I2C signals into four differential signals, two for SCL and two for SDA.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Jul 2021.
• Type : I2C type

Software Support

We provide a library for the I2CExtend2 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 I2CExtend2 Click driver.

Standard key functions :

• i2cextend2_cfg_setup Config Object Initialization function.

  void i2cextend2_cfg_setup ( i2cextend2_cfg_t *cfg );

• i2cextend2_init Initialization function.

  err_t i2cextend2_init ( i2cextend2_t *ctx, i2cextend2_cfg_t *cfg );

Example key functions :

• i2cextend2_rmt_write Generic write data in Remote Mode function.

  void i2cextend2_rmt_write ( i2cextend2_t *ctx, uint8_t reg, uint8_t tx_data );

• i2cextend2_rmt_read Generic read data in Remote Mode function.

  uint8_t i2cextend2_rmt_read ( i2cextend2_t *ctx, uint8_t reg );

• i2cextend2_enable Enable extend function.

  void i2cextend2_enable ( i2cextend2_t *ctx, uint8_t en_extend );

Example Description

This is an example which demonstrates the use of I2C Extend 2 Click board.

The demo application is composed of two sections :

Application Init

Initialization driver enables - I2C, check communication with device 6DOF IMU 11 Click connected to the I2C Extend 2 Click ( Remote Mode ), set default configuration and start measurement.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    i2cextend2_cfg_t i2cextend2_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.
    i2cextend2_cfg_setup( &i2cextend2_cfg );
    I2CEXTEND2_MAP_MIKROBUS( i2cextend2_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == i2cextend2_init( &i2cextend2, &i2cextend2_cfg ) ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );
        for ( ; ; );
    }

    i2cextend2_enable( &i2cextend2, I2CEXTEND2_EXTEND_ENABLE );

    if ( C6DOFIMU11_WHO_AM_I_WIA_ID == i2cextend2_rmt_read( &i2cextend2, C6DOFIMU11_REG_WHO_AM_I ) ) 
    {
        log_printf( &logger, "        SUCCESS         \r\n" );
        log_printf( &logger, "------------------------\r\n" );
    } 
    else 
    {
        log_printf( &logger, "         ERROR          \r\n" );
        log_printf( &logger, "    Reset the device    \r\n" );
        log_printf( &logger, "------------------------\r\n" );
        for ( ; ; );
    }
    i2cextend2_rmt_write ( &i2cextend2, C6DOFIMU11_REG_CNTL2, C6DOFIMU11_CNTL2_TEMP_EN_STANDBY_MODE |
                                                              C6DOFIMU11_CNTL2_MAG_EN_STANDBY_MODE |
                                                              C6DOFIMU11_CNTL2_ACCEL_EN_STANDBY_MODE );

    i2cextend2_rmt_write ( &i2cextend2, C6DOFIMU11_REG_INC3, C6DOFIMU11_INC3_IEL2_FIFO_TRIG |
                                                             C6DOFIMU11_INC3_IEL1_FIFO_TRIG );

    i2cextend2_rmt_write ( &i2cextend2, C6DOFIMU11_REG_CNTL2, C6DOFIMU11_CNTL2_GSEL_8G |
                                                              C6DOFIMU11_CNTL2_RES_MAX2 |
                                                              C6DOFIMU11_CNTL2_MAG_EN_OPERATING_MODE |
                                                              C6DOFIMU11_CNTL2_ACCEL_EN_OPERATING_MODE );
    Delay_ms ( 100 );
    log_info( &logger, " Application Task " );
    log_printf( &logger, "------------------------\r\n" );
}

Application Task

In this example, we read Accel and Mag axis of the connected 6DOF IMU 11 Click boards to the I2C Extend 2 Click ( Remote Mode ) which is connected by a LAN cable to I2C Extend 2 Click ( Local Mode ). Results are being sent to the Usart Terminal where you can track their changes. All data logs write on USB uart changes for every 2 sec.

void application_task ( void ) 
{
    log_printf( &logger, "\t   Accel   \t|\t    Mag    \r\n" );
    log_printf( &logger, "------------------------------------------------\r\n" );

    i2cextend2_6dofimu11_get_axis( &i2cextend2, C6DOFIMU11_REG_ACCEL_XOUT_L );
    log_printf( &logger, "\t Accel X: %d\t|", axis );
    i2cextend2_6dofimu11_get_axis( &i2cextend2, C6DOFIMU11_REG_MAG_XOUT_L );
    log_printf( &logger, "\t Mag X: %d\r\n", axis );

    i2cextend2_6dofimu11_get_axis( &i2cextend2, C6DOFIMU11_REG_ACCEL_YOUT_L );
    log_printf( &logger, "\t Accel Y: %d\t|", axis );
    i2cextend2_6dofimu11_get_axis( &i2cextend2, C6DOFIMU11_REG_MAG_YOUT_L );
    log_printf( &logger, "\t Mag Y: %d\r\n", axis );

    i2cextend2_6dofimu11_get_axis( &i2cextend2, C6DOFIMU11_REG_ACCEL_ZOUT_L );
    log_printf( &logger, "\t Accel Z: %d\t|", axis );
    i2cextend2_6dofimu11_get_axis( &i2cextend2, C6DOFIMU11_REG_MAG_ZOUT_L );
    log_printf( &logger, "\t Mag Z: %d\r\n", axis );

    log_printf( &logger, "------------------------------------------------\r\n" );
    Delay_ms ( 1000 );
}

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.I2CExtend2

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.