LLC I2C Click

LLC I2C Click can be utilized as the level converter for logic signals, which makes it a very useful Click board™. The topology of this logic level conversion (LLC) circuit is perfectly suited for the bi-directional I2C communication. Although there are some specialized integrated circuits on the market, sometimes it is more convenient to have a simple solution made of just a few passive elements and four MOSFETs.

Click Product page

Click library

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

Software Support

We provide a library for the LlcI2c 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 LlcI2c Click driver.

Standard key functions :

• Config Object Initialization function.

  void llci2c_cfg_setup ( llci2c_cfg_t *cfg );

• Initialization function.

  LLCI2C_RETVAL llci2c_init ( llci2c_t ctx, llci2c_cfg_t cfg );

Example key functions :

• This function writes data to the desired register.

  void llci2c_generic_write ( llci2c_t ctx, uint8_t reg, uint8_t data_buf, uint8_t len );

• This function reads data from the desired register.

  void llci2c_generic_read ( llci2c_t ctx, uint8_t reg, uint8_t data_buf, uint8_t len );

Examples Description

This Click can be utilized as the level converter for logic signals. The topology of this logic level conversion (LLC) circuit is perfectly suited for the bi-directional I2C communication.

The demo application is composed of two sections :

Application Init

Initialization driver init

void application_init ( void )
{
    log_cfg_t log_cfg;
    llci2c_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.

    llci2c_cfg_setup( &cfg );
    LLCI2C_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    llci2c_init( &llci2c, &cfg );
}

Application Task

Reads the temperature from the Thermo 7 Click board and logs data to UART.

void application_task ( void )
{
    // Thermo 7 measurement Temperature
    uint8_t write_reg = 0x00;
    uint8_t read_reg[ 2 ] = { 0 };

    float temp_msb;
    uint8_t temp_lsb;

    llci2c_generic_read ( &llci2c, write_reg, read_reg, 2 );

    temp_msb = read_reg[ 0 ];
    temp_lsb = read_reg[ 1 ] & 0xF0;

    if ( temp_lsb & 0x80 ) temp_msb += 0.50;
    if ( temp_lsb & 0x40 ) temp_msb += 0.25;
    if ( temp_lsb & 0x20 ) temp_msb += 0.125;
    if ( temp_lsb & 0x10 ) temp_msb += 0.0625;

    log_info( &logger, " Ambient temperature : %2.f C", temp_msb );
    Delay_ms ( 1000 );
}

Note

Connection between Thermo 7 and I2C-LLC is made through I2C interface.
You can connect a Thermo 7 Click and I2C-LLC Click with the wires to make connection between Click boards.
We use the Thermo 7 Click to demonstrate the functions of the I2C-LLC Click.

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.LlcI2c

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.