DIGI POT 8 Click

DIGI POT 8 Click is a compact add-on board used as a digitally controlled potentiometer. This board features the AD5206, 6-channel 256-position digitally controlled variable resistor device from Analog Devices.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Feb 2021.
• Type : SPI type

Software Support

We provide a library for the DIGIPOT8 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 DIGIPOT8 Click driver.

Standard key functions :

• digipot8_cfg_setup Config Object Initialization function.

  void digipot8_cfg_setup ( digipot8_cfg_t *cfg );

• digipot8_init Initialization function.

  DIGIPOT8_RETVAL digipot8_init ( digipot8_t *ctx, digipot8_cfg_t *cfg );

Example key functions :

• digipot8_write_data DIGI POT 8 write data function.

  err_t digipot8_write_data ( digipot8_t *ctx, uint8_t reg, uint8_t data_in )

• digipot8_set_wiper_1 DIGI POT 8 set wiper 2 function.

  err_t digipot8_set_wiper_1 ( digipot8_t *ctx, uint8_t data_in );

• digipot8_set_wiper_2 DIGI POT 8 set wiper 3 function.

  err_t digipot8_set_wiper_2 ( digipot8_t *ctx, uint8_t data_in );

Example Description

This example demonstrates the use of DIGI POT 8 Click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and makes an initial log.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    digipot8_cfg_t digipot8_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.

    digipot8_cfg_setup( &digipot8_cfg );
    DIGIPOT8_MAP_MIKROBUS( digipot8_cfg, MIKROBUS_1 );
    err_t init_flag  = digipot8_init( &digipot8, &digipot8_cfg );
    if ( init_flag == SPI_MASTER_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

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

Application Task

Iterates through the entire wiper range and sets all wipers to the iterator value each second. The current wiper position will be displayed on USB UART.

void application_task ( void )
{
    for ( uint8_t cnt = DIGIPOT8_WIPER_POSITION_MIN; cnt < DIGIPOT8_WIPER_POSITION_MAX; cnt += 5 )
    {
        digipot8_set_wiper_1 ( &digipot8, cnt );
        digipot8_set_wiper_2 ( &digipot8, cnt );
        digipot8_set_wiper_3 ( &digipot8, cnt );
        digipot8_set_wiper_4 ( &digipot8, cnt );
        digipot8_set_wiper_5 ( &digipot8, cnt );
        digipot8_set_wiper_6 ( &digipot8, cnt );
        log_printf( &logger, " * All wipers position set to %d *\r\n", ( uint16_t ) cnt );

        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.DIGIPOT8

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.