Library Description

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

Key functions:

• void i2cmux_hw_reset ( void ) - Hardware reset function.
• void i2cmux_set_channel ( uint8_t channel, uint8_t ch_slave_address ) - Set channel function.
• void i2cmux_generic_read ( uint8_t reg, uint8_t *p_rx_data, uint8_t n_bytes ) - Generic read data 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 Click board. In this example, we read "Who am I" register of the connected click boards to the UART MUX click. Channel 0 : 6DOF IMU 9 click [ slave address: 0x69; reg: 0x75; id val.: 0xA9 ], Channel 1 : RTC 10 click [ slave address: 0x68; reg: 0x0F; id val.: 0x88 ], Channel 2 : Altintude click [ slave address: 0x60; reg: 0x0C; id val.: 0xC4 ], Channel 3 : Temp & Hum click [ slave address: 0x5F; reg: 0x0F; id val.: 0xBC ]. All data logs write on USB UART changes every 2 sec.

void application_task ( )
{
    // SET CHANNEL 0: 6DOF IMU 9 click
    i2cmux_set_channel( I2CMUX_CMD_SET_CH_0, 0x69 );
    Delay_ms( 100 );
    
    i2cmux_generic_read( 0x75, &rx_data, 1 );
    mikrobus_logWrite( " CH-0 : ID = 0x", _LOG_TEXT );
    display_log( );

    // SET CHANNEL 1: RTC 10 click
    i2cmux_set_channel( I2CMUX_CMD_SET_CH_1, 0x68 );
    Delay_ms( 100 );
    
    i2cmux_generic_read( 0x0F, &rx_data, 1 );
    mikrobus_logWrite( " CH-1 : ST = 0x", _LOG_TEXT );
    display_log( );
    
    // SET CHANNEL 2: Altitude click
    i2cmux_set_channel( I2CMUX_CMD_SET_CH_2, 0x60 );
    Delay_ms( 100 );
    
    i2cmux_generic_read( 0x0C, &rx_data, 1 );
    mikrobus_logWrite( " CH-2 : ID = 0x", _LOG_TEXT );
    display_log( );
    
    // SET CHANNEL 3: Temp & Hum click
    i2cmux_set_channel( I2CMUX_CMD_SET_CH_3, 0x5F );
    Delay_ms( 100 );
    
    i2cmux_generic_read( 0x0F, &rx_data, 1 );
    mikrobus_logWrite( " CH-3 : ID = 0x", _LOG_TEXT );
    display_log( );
    
    mikrobus_logWrite( "------------------", _LOG_LINE );
    Delay_ms( 2000 );
}

• void display_log ( void ) - Display log function.

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.