i2cmux8

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I2C MUX 8 Click

I2C MUX 8 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : Stefan Filipovic
• Date : Feb 2025.
• Type : I2C type

Software Support

Example Description

This example demonstrates the use of I2C MUX 8 Click board by reading the device ID of a 6DOF IMU 11 and Compass 3 Click boards connected to the channels 1 and 4 respectfully.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.I2CMUX8

Example Key Functions

• i2cmux8_cfg_setup This function initializes Click configuration structure to initial values.

void i2cmux8_cfg_setup ( i2cmux8_cfg_t *cfg );

• i2cmux8_init This function initializes all necessary pins and peripherals used for this Click board.

err_t i2cmux8_init ( i2cmux8_t *ctx, i2cmux8_cfg_t *cfg );

• i2cmux8_set_channel This function sets the active channel and updates the slave address for communication.

err_t i2cmux8_set_channel ( i2cmux8_t *ctx, uint8_t ch_sel, uint8_t ch_slave_addr );

• i2cmux8_read_channel This function reads the currently selected channel.

err_t i2cmux8_read_channel ( i2cmux8_t *ctx, uint8_t *ch_sel );

• i2cmux8_i2c_read_reg This function reads data from a specific register of the currently active I2C slave.

err_t i2cmux8_i2c_read_reg ( i2cmux8_t *ctx, uint8_t reg, uint8_t *data_out, uint8_t len );

Application Init

Initializes the driver and resets the device.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    i2cmux8_cfg_t i2cmux8_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.
    i2cmux8_cfg_setup( &i2cmux8_cfg );
    I2CMUX8_MAP_MIKROBUS( i2cmux8_cfg, MIKROBUS_POSITION_I2CMUX8 );
    if ( I2C_MASTER_ERROR == i2cmux8_init( &i2cmux8, &i2cmux8_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    i2cmux8_reset_device ( &i2cmux8 );
    
    log_info( &logger, " Application Task " );
}

Application Task

Reads the device ID of the connected Click boards. Channel 1 : 6DOF IMU 11 Click [slave address: 0x0E; reg: 0x00; id: 0x2D], Channel 4 : Compass 3 Click [slave address: 0x30; reg: 0x2F; id: 0x0C]. All data is being logged on the USB UART where you can check the device ID.

void application_task ( void )
{
    uint8_t channel = 0, device_id = 0;
    if ( I2CMUX8_OK == i2cmux8_set_channel ( &i2cmux8, DEVICE0_POSITION, DEVICE0_SLAVE_ADDRESS ) )
    {
        if ( I2CMUX8_OK == i2cmux8_read_channel ( &i2cmux8, &channel ) )
        {
            log_printf( &logger, " --- Channel %u --- \r\n", ( uint16_t ) channel );
        }
        if ( I2CMUX8_OK == i2cmux8_i2c_read_reg ( &i2cmux8, DEVICE0_REG_ID, &device_id, 1 ) )
        {
            log_printf( &logger, " %s - Device ID: 0x%.2X \r\n\n", ( char * ) DEVICE0_NAME, ( uint16_t ) device_id );
        }
        Delay_ms ( 1000 );
    }
    if ( I2CMUX8_OK == i2cmux8_set_channel ( &i2cmux8, DEVICE1_POSITION, DEVICE1_SLAVE_ADDRESS ) )
    {
        if ( I2CMUX8_OK == i2cmux8_read_channel ( &i2cmux8, &channel ) )
        {
            log_printf( &logger, " --- Channel %u --- \r\n", ( uint16_t ) channel );
        }
        if ( I2CMUX8_OK == i2cmux8_i2c_read_reg ( &i2cmux8, DEVICE1_REG_ID, &device_id, 1 ) )
        {
            log_printf( &logger, " %s - Device ID: 0x%.2X \r\n\n", ( char * ) DEVICE1_NAME, ( uint16_t ) device_id );
        }
        Delay_ms ( 1000 );
    }
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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