digipot

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DIGI POT Click

DIGI POT 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 : Stefan Ilic
• Date : Jun 2021.
• Type : SPI type

Software Support

Example Description

The demo application changes the resistance using DIGIPOT Click.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.DigiPot

Example Key Functions

• digipot_cfg_setup Config Object Initialization function.

void digipot_cfg_setup ( digipot_cfg_t *cfg );

• digipot_init Initialization function.

err_t digipot_init ( digipot_t *ctx, digipot_cfg_t *cfg );

• digipot_set_wiper_positions The function sets 8-bit wiper positions data.

void digipot_set_wiper_positions ( digipot_t *ctx, uint8_t wiper_pos );

• digipot_convert_output The function convert 10-bit ADC value to volatage reference.

float digipot_convert_output ( uint16_t adc_val, float v_ref );

Application Init

Initializes SPI and LOG modules.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    digipot_cfg_t digipot_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.

    digipot_cfg_setup( &digipot_cfg );
    DIGIPOT_MAP_MIKROBUS( digipot_cfg, MIKROBUS_POSITION_DIGIPOT );
    err_t init_flag  = digipot_init( &digipot, &digipot_cfg );
    if ( SPI_MASTER_ERROR == init_flag ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    log_printf( &logger, "----------------\r\n" );
    log_printf( &logger, " DIGI POT Click\r\n" );
    log_printf( &logger, "----------------\r\n" );
}

Application Task

This is an example which demonstrates the use of DIGI POT Click board. Increments the wiper position by 10 positions every 5 seconds.

void application_task ( void ) 
{
    for ( uint16_t n_cnt = 127; n_cnt < 255; n_cnt += 10 ) {
        wiper_pos = ( uint8_t ) n_cnt;
        digipot_set_wiper_positions( &digipot, wiper_pos );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }
}

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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