I2C MUX 4 Click

I2C MUX 4 Click is a compact add-on board that contains a dual bidirectional translating switch dedicated for applications with I2C slave address conflicts. This board features the TCA9543APWR, a low voltage 2-channel I2C bus switch with interrupt logic from Texas Instruments.

Click Product page

Click library

• Author : MikroE Team
• Date : Sep 2020.
• Type : I2C type

Software Support

We provide a library for the I2cMux4 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 I2cMux4 Click driver.

Standard key functions :

• Config Object Initialization function.

  void i2cmux4_cfg_setup ( i2cmux4_cfg_t *cfg );

• Initialization function.

  I2CMUX4_RETVAL i2cmux4_init ( i2cmux4_t ctx, i2cmux4_cfg_t cfg );

Example key functions :

• Get channel interrupt function

  uint8_t i2cmux4_get_ch_interrupt ( i2cmux4_t *ctx );

• Generic read data function

  void i2cmux4_rmt_read_bytes ( i2cmux4_t ctx, uint8_t reg, uint8_t p_rx_data, uint8_t n_bytes );

• Check interrupt function.

  uint8_t i2cmux4_check_int ( i2cmux4_t *ctx );

Examples Description

This example demonstrates the use of the I2C MUX 4 Click.

The demo application is composed of two sections :

Application Init

Initializes the driver, enables the Click board and makes an initial log.

void application_init ( void )
{
    log_cfg_t log_cfg;
    i2cmux4_cfg_t cfg;

    /** 
     * 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.

    i2cmux4_cfg_setup( &cfg );
    I2CMUX4_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    i2cmux4_init( &i2cmux4, &cfg );

    i2cmux4_power_on( &i2cmux4, I2CMUX4_ENABLE_POWER_ON );
    Delay_ms ( 100 );

    i2cmux4_set_channel( &i2cmux4, I2CMUX4_SEL_CH_ALL_DISABLE, 0x00 );
    Delay_ms ( 100 );
}

Application Task

In this example, we read the device ID register of the connected Click boards. Channel 0 : 6DOF IMU 12 Click [slave address: 0x68; reg: 0x00; id val.: 0x24], Channel 1 : Compass 3 Click [slave address: 0x30; reg: 0x2F; id val.: 0x0C]. All data logs write on USB UART changes every 2 sec.

void application_task ( void )
{
    // CH 0 - 6DOF IMU 12 Click
    i2cmux4_set_channel( &i2cmux4, I2CMUX4_SEL_CH_0, 0x68 );
    Delay_ms ( 100 );

    i2cmux4_rmt_read_bytes( &i2cmux4, 0x00, &rx_data, 1 );
    Delay_ms ( 100 );

    log_printf( &logger, "    6DOF IMU 12 Click   \r\n" );
    log_printf( &logger, "- - - - - - - - - - - - \r\n" );
    log_printf( &logger, "       ID = 0x%.2X  \r\n", ( uint16_t ) rx_data );
    log_printf( &logger, "----------------------- \r\n" );
    Delay_ms ( 1000 );


    // CH 1 - Compass 3 Click
    i2cmux4_set_channel( &i2cmux4, I2CMUX4_SEL_CH_1, 0x30 );
    Delay_ms ( 100 );

    i2cmux4_rmt_read_bytes( &i2cmux4, 0x2F, &rx_data, 1 );
    Delay_ms ( 100 );

    log_printf( &logger, "      Compass 3 Click      \r\n" );
    log_printf( &logger, "- - - - - - - - - - - - \r\n" );
    log_printf( &logger, "       ID = 0x%.2X \r\n ", ( uint16_t ) rx_data );
    log_printf( &logger, "----------------------- \r\n" );
    Delay_ms ( 1000 );
}

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.I2cMux4

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.