digipot3

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DIGI POT 3 Click

DIGI POT 3 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : MikroE Team
• Date : Jan 2020.
• Type : SPI type

Software Support

Example Description

This app get value from digital potentiometer and stored to the EEMEM memory.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.DigiPot3

Example Key Functions

• digipot3_cfg_setup Config Object Initialization function.

void digipot3_cfg_setup ( digipot3_cfg_t *cfg );

• digipot3_init Initialization function.

err_t digipot3_init ( digipot3_t *ctx, digipot3_cfg_t *cfg );

• digipot3_default_cfg Click Default Configuration function.

void digipot3_default_cfg ( digipot3_t *ctx );

• digipot3_store_eemem This function stores 16-bit data to the desired EEMEM (non volatile) memory location.

uint8_t digipot3_store_eemem ( digipot3_t *ctx, uint8_t location_address, uint16_t transfer_data );

• digipot3_send_command This function executes the desired command.

uint8_t digipot3_send_command ( digipot3_t *ctx, uint8_t command_byte );

• digipot3_write_dac This function writes 10-bit value to DAC register and determines the wiper position.

uint8_t digipot3_write_dac ( digipot3_t *ctx, uint16_t value_dac );

Application Init

Initializes device.

void application_init ( void )
{
    log_cfg_t log_cfg;
    digipot3_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 ----\r\n" );

    //  Click initialization.

    digipot3_cfg_setup( &cfg );
    DIGIPOT3_MAP_MIKROBUS( cfg, MIKROBUS_POSITION_DIGIPOT3 );
    digipot3_init( &digipot3, &cfg );

    Delay_ms ( 200 );
    
    digipot3_read_dac(  &digipot3, &digital_value );
    digipot3_read_eemem( &digipot3, DIGIPOT3_RDAC_EEMEM_LOC, &eemem_value );
    
    if ( eemem_value != digital_value )
    {
        digipot3_send_command( &digipot3, DIGIPOT3_RESTORE_EEMEM_TO_RDAC_COMM );
    }

    log_printf( &logger, "DIGI POT 3 is initialized \r\n" );
    Delay_ms ( 200 );
}

Application Task

Increments the wiper position by 6dB every 2 seconds. When wiper position reaches the desired value (0x0200), then the wiper position be decremented by 6dB every 2 seconds, until position value reaches the new desired value (0x0002). After that the new position value will be stored to the EEMEM memory, if that value does not already exist in the EEMEM memory.

void application_task ( void )
{
    while ( digital_value < 0x0200 )
    {
        digipot3_send_command( &digipot3, DIGIPOT3_INCREMENT_RDAC_6DB_COMM );
        digipot3_read_dac( &digipot3, &digital_value );
        log_printf( &logger, "DAC value is: %u \r\n", digital_value );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }

    while ( digital_value > 0x0002 )
    {
        digipot3_send_command( &digipot3, DIGIPOT3_DECREMENT_RDAC_6DB_COMM );
        digipot3_read_dac( &digipot3, &digital_value );
        log_printf( &logger, "DAC value is: %u \r\n", digital_value );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }

    if ( eemem_value != digital_value )
    {
        digipot3_send_command( &digipot3, DIGIPOT3_STORE_RDAC_TO_EEMEM_COMM );
        eemem_value = digital_value;
    }
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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