I2C 1-Wire 2 Click

I2C 1-Wire 2 Click is a compact add-on board bridging I2C master interfaces with 1-Wire slave devices, ideal for simplifying complex communication protocols. This board features the DS2485, an advanced 1-Wire master with memory from Analog Devices. It features adjustable internal timers for precise 1-Wire signal management, relieving the host processor of timing-sensitive operations, and supports standard and overdrive communication speeds.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Dec 2023.
• Type : I2C type

Software Support

We provide a library for the I2C 1-Wire 2 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 from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for I2C 1-Wire 2 Click driver.

Standard key functions :

• i2c1wire2_cfg_setup Config Object Initialization function.

  void i2c1wire2_cfg_setup ( i2c1wire2_cfg_t *cfg );

• i2c1wire2_init Initialization function.

  err_t i2c1wire2_init ( i2c1wire2_t *ctx, i2c1wire2_cfg_t *cfg );

• i2c1wire2_default_cfg Click Default Configuration function.

  err_t i2c1wire2_default_cfg ( i2c1wire2_t *ctx );

Example key functions :

• i2c1wire2_master_reset This function is used to reset device, and return all configuration registers to the default values.

  err_t i2c1wire2_master_reset ( i2c1wire2_t *ctx );

• i2c1wire2_write_port_cfg This function is used to write a 1-Wire configuration register.

  err_t i2c1wire2_write_port_cfg ( i2c1wire2_t *ctx, uint8_t reg, uint8_t *data_in );

• i2c1wire2_search This function is used to perform 1-Wire Search algorithm and return one device ROMID.

  err_t i2c1wire2_search ( i2c1wire2_t *ctx, uint8_t *flag, uint8_t *rom_id, uint8_t *last_flag, uint8_t param_data, uint8_t command_code );

Example Description

This example demonstrates the use of the I2C 1-Wire 2 Click board by searching if a device is connected and reading its ROMID.

The demo application is composed of two sections :

Application Init

Initialization of I2C module, log UART and perform Click default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    i2c1wire2_cfg_t i2c1wire2_cfg;  /**< Click config object. */

    /** 
     * 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.
    i2c1wire2_cfg_setup( &i2c1wire2_cfg );
    I2C1WIRE2_MAP_MIKROBUS( i2c1wire2_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == i2c1wire2_init( &i2c1wire2, &i2c1wire2_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( I2C1WIRE2_ERROR == i2c1wire2_default_cfg ( &i2c1wire2 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Performing 1-Wire Search algorithm to find if any device is connected. If a device is connected and detected, its ROMID will be read and displayed.

void application_task ( void ) 
{
    err_t error_flag;
    uint8_t flag;
    uint8_t last_flag;
    uint8_t rom_id[ 8 ] = { 0 };
    #define I2C1WIRE2_DEVICE_SEARCH_CODE            0xF0

    error_flag = i2c1wire2_search ( &i2c1wire2, &flag, rom_id, &last_flag, I2C1WIRE2_SEARCH_RESET | 
                                    I2C1WIRE2_SEARCH_1WIRE_RESET, I2C1WIRE2_DEVICE_SEARCH_CODE );
    if ( I2C1WIRE2_OK == error_flag )
    {   
        if ( I2C1WIRE2_RESULT_BYTE_OK == flag )
        {
            log_printf( &logger, " Device found: \r\n" );
            log_printf( &logger, " Device ROMID: 0x" );
            for ( uint8_t n_cnt = 0; n_cnt < 8; n_cnt++ )
            {
                log_printf( &logger, "%.2X", ( uint16_t ) rom_id[ n_cnt ] );
            }
            log_printf( &logger, " \r\n" );
            log_printf( &logger, " Last device flag %d \r\n", last_flag );
        }
        else if ( I2C1WIRE2_NO_DEVICE_DETECTED == flag )
        {
            log_printf( &logger, " No device detected \r\n" );
        }
        else if ( I2C1WIRE2_NO_PRESENCE_PULS == flag )
        {
            log_printf( &logger, " No presence puls \r\n" );
        }
    }
    else 
    {
        log_printf( &logger, " ERROR \r\n" );
    }
    Delay_ms ( 1000 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.I2C1Wire2

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. UART terminal is available in all MikroElektronika compilers.