ADC 22 Click

ADC 22 Click is a compact add-on board with a high-performance data converter. This board features the ADS8665, a high-speed single-supply SAR ADC data acquisition system with programmable bipolar input ranges from Texas Instruments. It features a high-speed, high-precision A/D converter based on successive approximation (SAR). This 12-bit resolution ADC with an integrated analog front-end (AFE) input driver circuit can achieve speeds of up to 500ksps.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Jul 2023.
• Type : SPI type

Software Support

We provide a library for the ADC 22 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 ADC 22 Click driver.

Standard key functions :

• adc22_cfg_setup Config Object Initialization function.

  void adc22_cfg_setup ( adc22_cfg_t *cfg );

• adc22_init Initialization function.

  err_t adc22_init ( adc22_t *ctx, adc22_cfg_t *cfg );

• adc22_default_cfg Click Default Configuration function.

  err_t adc22_default_cfg ( adc22_t *ctx );

Example key functions :

• adc22_get_voltage ADC 22 get voltage level function.

  err_t adc22_get_voltage ( adc22_t *ctx, float *voltage );

• adc22_get_adc_raw_data ADC 22 get ADC raw data function.

  err_t adc22_get_adc_raw_data ( adc22_t *ctx, uint16_t *raw_adc );

• adc22_set_range ADC 22 set range function.

  err_t adc22_set_range ( adc22_t *ctx, adc22_range_sel_t range );

Example Description

This example demonstrates the use of the ADC 22 Click board™ by reading and writing data by using SPI serial interface and reading results of AD conversion.

The demo application is composed of two sections :

Application Init

Initialization of SPI module and log UART. After driver initialization, the app executes a default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    adc22_cfg_t adc22_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.
    adc22_cfg_setup( &adc22_cfg );
    ADC22_MAP_MIKROBUS( adc22_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == adc22_init( &adc22, &adc22_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    Delay_ms ( 100 );

    if ( ADC22_ERROR == adc22_default_cfg ( &adc22 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    Delay_ms ( 100 );

    log_info( &logger, " Application Task " );
    log_printf( &logger, " ----------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

The demo application reads the voltage levels from analog input and displays the results. By default, the operating input range sets from 0V to 12.288V [3×Vref;Vref=4.096V]. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void )
{   
    static float voltage = 0.0;
    if ( ADC22_OK == adc22_get_voltage ( &adc22, &voltage ) )
    {
        log_printf( &logger, " Voltage : %.2f V\r\n", voltage );
        log_printf( &logger, " ----------------\r\n" );
        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.ADC22

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. UART terminal is available in all MikroElektronika compilers.