Library Description

The library covers necessary functions that enable the usage of the DIGI POT 6 click board. User can read and write data to and from Volatile Wiper 0 and Volatile TCON Register or issue increment and decrement commands to Volatile Wiper 0. User can also Connect/Disconnect Resistor 0 Terminal A, Resistor 0 Terminal B, Resistor 0 Wiper and Resistor 0 Hardware Configuration Control.

Key functions:

• void digipot6_write_data ( uint8_t reg_adr, uint8_t wr_byte ) - Function is used to write single byte of data into user defined register.
• uint8_t digipot6_read_data ( uint8_t reg_adr ); - Function is used to read single byte of data from user defined register.
• void digipot6_set_r0hw ( uint8_t state ); - Function is used to force Resistor 0 into the “shutdown” configuration.

Examples description

The application is composed of three sections :

• System Initialization - Initializes SPI module and LOG structures.
• Application Initialization - Initalizes SPI and device drivers, wakes up the device and connects terminal A, terminal B and wiper to the resistor 0 network.
• Application Task - Demonstrates use of DIGI POT 6 click board by setting wiper to step 0, then going through the steps, fifteen at a time and displaying data via USART terminal.

void application_task ( )
{
    digipot6_write_data( DIGIPOT6_VOLATILE_WIPER_0, 0x00 );
    for ( cnt = 0; cnt <= 255; cnt += 15 )
    {
        digipot6_write_data( DIGIPOT6_VOLATILE_WIPER_0, cnt );
        Delay_ms( 10 );
        wiper_val = digipot6_read_data( DIGIPOT6_VOLATILE_WIPER_0 );
        ByteToStr( wiper_val, log_txt );
        mikrobus_logWrite( " Wiper step : ", _LOG_TEXT );
        Ltrim( log_txt );
        mikrobus_logWrite( log_txt, _LOG_LINE );
        Delay_ms( 1000 );
    }

    mikrobus_logWrite( "------------------------", _LOG_LINE );
    Delay_ms( 1000 );
}

Other mikroE Libraries used in the example:

• SPI
• 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.