waveform

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Waveform click

Waveform Click is a precise sine/triangle/square waveform generator, capable of reproducing frequencies up to 12MHz.

click Product page

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Click library

• Author : MikroE Team
• Date : Dec 2019.
• Type : SPI type

Software Support

We provide a library for the Waveform 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Waveform Click driver.

Standard key functions :

• Config Object Initialization function.

void waveform_cfg_setup ( waveform_cfg_t *cfg );

• Initialization function.

WAVEFORM_RETVAL waveform_init ( waveform_t *ctx, waveform_cfg_t *cfg );

Example key functions :

• Freqency function

void waveform_write_freqency ( waveform_t *ctx, uint32_t f );

• Triangle output function

void waveform_triangle_output ( waveform_t *ctx, uint32_t f );

• Square output function

void waveform_square_output ( waveform_t *ctx, uint32_t f );

Examples Description

This program outputs wave forms.

The demo application is composed of two sections :

Application Init

Initializes the communication interface and configures the click board.

void application_init ( )
{
    log_cfg_t log_cfg;
    waveform_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 ----" );

    //  Click initialization.

    waveform_cfg_setup( &cfg );
    WAVEFORM_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    waveform_init( &waveform, &cfg );

    freq = waveform_aprox_freqcalculation( 5000 );
    waveform_square_output( &waveform, freq );
    freq = 0;
}
  

Application Task

Predefined characters are inputed from the serial port. Changes the signal frequency, waveform or amplitude depending on the receiver character.

void application_task ( )
{
    uint8_t rx_len = log_read ( &logger, rx_data_buffer, 1 );
    
    if ( rx_len > 0 ) 
    {
       switch( rx_data_buffer[ 0 ] )
       {
           case '+': {
                            waveform_digipot_inc( &waveform );
                            log_printf( &logger, "Increasing amplitude of the current wave.\r\n" );
                            break;
                        }
           case '-': {
                            waveform_digipot_dec( &waveform );
                            log_printf( &logger, "Decreasing amplitude of the current wave.\r\n" );
                            break;
                        }
           case 'S': {
                            frequency_increment( WAVEFORM_SINE_OUT );
                            log_printf( &logger, "Increasing frequency of the sine wave.\r\n" );
                            break;
                        }
           case 's': {
                            frequency_decrement( WAVEFORM_SINE_OUT );
                            log_printf( &logger, "Decreasing frequency of the sine wave.\r\n" );
                            break;
                        }
           case 'T': {
                            frequency_increment( WAVEFORM_TRIANGLE_OUT );
                            log_printf( &logger, "Increasing frequency of the triangle wave.\r\n" );
                            break;
                        }
           case 't': {
                            frequency_decrement( WAVEFORM_TRIANGLE_OUT );
                            log_printf( &logger, "Decreasing frequency of the triangle wave.\r\n" );
                            break;
                        }
           case 'Q': {
                            frequency_increment( WAVEFORM_SQUARE_OUT );
                            log_printf( &logger, "Increasing frequency of the square wave.\r\n" );
                            break;
                        }
           case 'q': {
                            frequency_decrement( WAVEFORM_SQUARE_OUT );
                            log_printf( &logger, "Decreasing frequency of the square wave.\r\n" );
                            break;
                        }
           default :{
                            break;
                        }
       }
       rx_data_buffer[ 0 ] = 0;
       rx_len = 0;
    }
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Waveform

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.

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