I2C MUX 3 Click

I2C MUX 3 Click is a compact add-on board that contains eight bidirectional translating switches dedicated for applications with I2C slave address conflicts. This board features the TCA9548APWR, a low voltage 8-channel I2C bus switch with an active-low reset input 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 I2cMux3 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 I2cMux3 Click driver.

Standard key functions :

• Config Object Initialization function.

  void i2cmux3_cfg_setup ( i2cmux3_cfg_t *cfg );

• Initialization function.

  I2CMUX3_RETVAL i2cmux3_init ( i2cmux3_t ctx, i2cmux3_cfg_t cfg );

Example key functions :

• Slave Device Read function

  void i2cmux3_rd_slv ( i2cmux3_t ctx, uint8_t slv_sel_adr, uint8_t reg, uint8_t p_rd_data, uint8_t n_bytes );

• Device enable function

  void i2cmux3_dev_enable ( i2cmux3_t *ctx, uint8_t stat );

• Hardware reset function

  void i2cmux3_hw_rst ( i2cmux3_t *ctx );

Examples Description

This example demonstrates the use of I2C MUX 3 Click board.

The demo application is composed of two sections :

Application Init

Initalizes the driver, preforms hardware reset, then enables channel 0 and makes an initial log.

void application_init ( void )
{
    log_cfg_t log_cfg;
    i2cmux3_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.

    i2cmux3_cfg_setup( &cfg );
    I2CMUX3_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    i2cmux3_init( &i2cmux3, &cfg );
    Delay_ms ( 100 );

    i2cmux3_hw_rst( &i2cmux3 );
    Delay_ms ( 100 );
    i2cmux3_ch_sel( &i2cmux3, 0 );
    log_printf( &logger, " Please connect a 6DOF IMU 12 Click to channel 0\r\n" );
    log_printf( &logger, "-------------------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

Application Task

Reads the device ID of a 6DOF IMU 12 Click (dev ID: 0x24) and displays it on the USB UART each second.

void application_task ( void )
{
    i2cmux3_rd_slv ( &i2cmux3, 0x68, 0x00, &id_val, 1 );
    log_printf( &logger, " The Click device ID is:  0x%.2X \r\n", ( uint16_t ) id_val );
    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.I2cMux3

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.