Library Description

The library covers all the necessary functions to control I2C OneWire click board. 
Library performs the communication with the device via I2C protocol by writing to registers and by reading from registers.

Key functions:

• uint8_t i2conewire_setChannel( uint8_t channel ) - Set the channel function.
• void i2conewire_writeByteOneWire( uint8_t writeData ) - Generic One Wire writes the byte of data function.
• uint8_t i2conewire_readByteOneWire() - Generic One Wire read the byte of data function.

Examples description

The application is composed of the three sections :

• System Initialization - Initializes I2C structures and start to write log.
• Application Initialization - Initialization driver enables - I2C, also write log.
• Application Task - This is an example which demonstrates the use of I2C OneWire click board. I2C OneWire click communicates with register via I2C protocol by the write to register and read from the register. This example shows ID numbers for any click with OneWire protocol connected on each channel. Results are being sent to the Usart Terminal where you can track their changes. All data logs write on USB uart changes for every 1 sec.

void applicationTask()
{
    stateOfCh = 1;
    i2conewire_softReset();
    Delay_10ms();

    i2conewire_setConfig( _I2CONEWIRE_CONFIG_1WS_HIGH | _I2CONEWIRE_CONFIG_SPU_HIGH | _I2CONEWIRE_CONFIG_APU_LOW );
    Delay_10ms();

    for( cntCh = 0; cntCh < 8; cntCh++ )
    {
        i2conewire_setChannel( cntCh );
        i2conewire_oneWireReset();
        Delay_10ms();

        i2conewire_writeByteOneWire( _I2CONEWIRE_WIRE_COMMAND_READ_ROM );
        Delay_10ms();

        for ( cntVal = 8; cntVal > 0; cntVal-- )
        {
            idCode[ cntVal ] = i2conewire_readByteOneWire();

            if( idCode[ cntVal ] == _I2CONEWIRE_WIRE_RESULT_OK )
            {
                ByteToStr( cntCh, logText );
                ltrim( logText );
                mikrobus_logWrite( " Channel ", _LOG_TEXT );
                mikrobus_logWrite( logText, _LOG_TEXT );
                mikrobus_logWrite( " : No device on the channel! ", _LOG_TEXT );
                Delay_100ms();
                break;
            }
            else if ( stateOfCh )
            {
                ByteToStr( cntCh, logText );
                ltrim( logText );
                mikrobus_logWrite( " Channel ", _LOG_TEXT );
                mikrobus_logWrite( logText, _LOG_TEXT );
                mikrobus_logWrite( " : ID = 0x", _LOG_TEXT );
                stateOfCh = 0;
            }

            ByteToHex( idCode[ cntVal ], logText );
            ltrim( logText );
            mikrobus_logWrite( logText, _LOG_TEXT );
            Delay_100ms();
        }

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

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.