Waveform 2 Click

Waveform 2 Click is a compact add-on board that contains a direct digital synthesis device for waveform generator applications. This board features the AD9834, a 75 MHz low power DDS device capable of producing high-performance sine/triangle/square outputs from Analog Devices. It provides the capability for phase and frequency modulation and has an on-board comparator that allows the production of a square wave signal for clock generation.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Aug 2021.
• Type : I2C/SPI type

Software Support

We provide a library for the Waveform2 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 Waveform2 Click driver.

Standard key functions :

• waveform2_cfg_setup Config Object Initialization function.

  void waveform2_cfg_setup ( waveform2_cfg_t *cfg );

• waveform2_init Initialization function.

  err_t waveform2_init ( waveform2_t *ctx, waveform2_cfg_t *cfg );

• waveform2_default_cfg Click Default Configuration function.

  err_t waveform2_default_cfg ( waveform2_t *ctx );

Example key functions :

• waveform2_eeprom_read_string Waveform 2 read string function.

  void waveform2_eeprom_read_string ( waveform2_t *ctx, uint16_t addr, uint8_t *data_buf, uint16_t len );

• waveform2_eeprom_write_string Waveform 2 write string function.

  void waveform2_eeprom_write_string ( waveform2_t *ctx, uint16_t addr, uint8_t *data_buf, uint16_t len );

• waveform2_sine_output Waveform 2 set sine output function.

  void waveform2_sine_output ( waveform2_t *ctx );

Example Description

This is an example that demonstrates the use of the Waveform 2 Click board.

The demo application is composed of two sections :

Application Init

Initialize the communication interface, preforming hardware reset, and configure the Click board.

void application_init ( void ) {
    log_cfg_t log_cfg;  /**< Logger config object. */
    waveform2_cfg_t waveform2_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.
    waveform2_cfg_setup( &waveform2_cfg );
    WAVEFORM2_MAP_MIKROBUS( waveform2_cfg, MIKROBUS_1 );
    err_t init_flag  = waveform2_init( &waveform2, &waveform2_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
    waveform2_default_cfg ( &waveform2 );

    log_printf( &logger, "---- EEPROM test ----\r\n " );
    log_printf( &logger, ">> Write [MikroE] to address 0x0123\r\n " );
    waveform2_eeprom_write_string( &waveform2, 0x0123, demo_tx_buf, 6 );
    waveform2_eeprom_read_string ( &waveform2, 0x0123, demo_rx_buf, 6 );
    log_printf( &logger, ">> Read data: %s  from address 0x0123.... \r\n ", demo_rx_buf );
    Delay_ms ( 1000 );
    waveform2_hw_reset( &waveform2 );
    Delay_ms ( 1000 );

    log_printf( &logger, "---- Waveform set freqency ----\r\n" );
    int32_t freqency;
    freqency = aprox_freq_calculation( value );
    waveform2_set_freq( &waveform2, freqency );
    waveform2_triangle_output( &waveform2 );
    Delay_ms ( 1000 );
    log_info( &logger, " Application Task " );
}

Application Task

Predefined characters are inputed from the serial port. Depending on the character sent the signal frequency, waveform or amplitude will be changed.

void application_task ( void ) {
    char rx_data;
    uint32_t freq_data;

    if ( log_read( &logger, &rx_data, 1 ) ) {
        switch ( rx_data ) {
            case '+': {
                if ( value > 200000 ) {
                    value = 0;
                }
                value += 100000;
                freq_data = aprox_freq_calculation( value );
                waveform2_set_freq( &waveform2, freq_data );
                log_printf( &logger, ">> Increasing the frequency \r\n " );
                break;
            }

            case '-': {
                if ( value < 200000 ) {
                    value = 400000;
                }
                value -= 100000;
                freq_data = aprox_freq_calculation( value );
                waveform2_set_freq( &waveform2, freq_data );
                log_printf( &logger, ">> Decreasing the frequency \r\n " );
                break;
            }

            case 't': {
                waveform2_triangle_output( &waveform2 );
                log_printf( &logger, ">> Triangle output \r\n " );
                break;
            }

            case 's': {
                waveform2_sine_output( &waveform2 );
                log_printf( &logger,  ">> Sinusoid output \r\n " );
                break;
            }
        }
    }
}

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.Waveform2

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.