Library Description

The library covers all the necessary functions to control I2C MUX 2 click board.

Key functions:

• void i2cmux2_hw_reset ( void ) - Hardware reset function
• void i2cmux2_set_channel ( uint8_t channel, uint8_t ch_slave_address ) - Set channel function.
• uint8_t i2cmux2_read_interrupt ( void ) - Read interrupt status function.

Examples description

The application is composed of three sections :

• System Initialization - Initializes I2C, set RST pin as output and start to write log.
• Application Initialization - Initialization driver enables - I2C, executes call hardware reset, also write log.
• Application Task - (code snippet) This is an example that demonstrates the use of the I2C MUX 2 Click board. In this example, we read "Who am I" ( or "State" ) register of the connected click boards to the I2C MUX 2 click. Channel 0 : 6DOF IMU 11 click [slave address: 0x0E; reg: 0x00; id val.: 0x2D], Channel 1 : Altintude click [slave address: 0x60; reg: 0x0C; id val.: 0xC4], Channel 2 : 6DOF IMU 9 click [slave address: 0x69; reg: 0x75; id val.: 0xA9], Channel 3 : RTC 10 click [slave address: 0x68; reg: 0x0F; st val.: 0x88]. All data logs write on USB UART changes every 2 sec.

void application_task ( )
{
    mikrobus_logWrite( "  CH  |   ID   |  INT " ,_LOG_LINE );
    mikrobus_logWrite( "----------------------", _LOG_LINE );
    
    // SET CHANNEL 0: 6DOF IMU 11 click
    i2cmux2_set_channel( I2CMUX2_CMD_SET_CH_0, 0x0E );
    Delay_ms( 100 );
    i2cmux2_generic_read( 0x00, &rx_data, 1 );
    mikrobus_logWrite( "   0  |  0x", _LOG_TEXT );
    display_log( I2CMUX2_CMD_SET_CH_0 );
    
    // SET CHANNEL 1: Altitude click
    i2cmux2_set_channel( I2CMUX2_CMD_SET_CH_1, 0x60 );
    Delay_ms( 100 );
    i2cmux2_generic_read( 0x0C, &rx_data, 1 );
    mikrobus_logWrite( "   1  |  0x", _LOG_TEXT );
    display_log( I2CMUX2_CMD_SET_CH_1 );
    
    // SET CHANNEL 2: 6DOF IMU 9 click
    i2cmux2_set_channel( I2CMUX2_CMD_SET_CH_2, 0x69 );
    Delay_ms( 100 );
    i2cmux2_generic_read( 0x75, &rx_data, 1 );
    mikrobus_logWrite( "   2  |  0x", _LOG_TEXT );
    display_log( I2CMUX2_CMD_SET_CH_2 );

    // SET CHANNEL 3: RTC 10 click
    i2cmux2_set_channel( I2CMUX2_CMD_SET_CH_3, 0x68 );
    Delay_ms( 100 );
    i2cmux2_generic_read( 0x0F, &rx_data, 1 );
    mikrobus_logWrite( "   3  |  0x", _LOG_TEXT );
    display_log( I2CMUX2_CMD_SET_CH_3 );

    mikrobus_logWrite( "----------------------", _LOG_LINE );
    Delay_ms( 2000 );
}

Additional Functions :

• void display_log ( uint8_t sel_ch ) - Display data logs.

Other mikroE Libraries used in the example:

• I2C
• UART
• Conversions

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.