Library Description

Library contains generic functions for working with the Waveform 2 Click™ board.

Key functions:

• void waveform2_set_freq ( uint32_t freq ) - Function for setting the output frequency.
• void waveform2_sine_output ( void ) - Function for setting the sine output.
• void waveform2_triangle_output ( void ) - Function for setting the triangle output.

Examples description

The application is composed of three sections :

• System Initialization - Initialize the GPIO and communication structures.
• Application Initialization - Initialize the communication interface and configure the Click board™.
• Application Task - Predefined characters are inputed from the serial port. Depending on the character sent the signal frequency, waveform or amplitude will be changed.
• Command: [ + ] - Increase frequency [ - ] - Decrease frequency [ t ] - Triangle-shaped signal [ s ] - The signal in the form of a sinusoid

void application_task ( )
{
    char rx_data;
    uint32_t freq_data;

    if ( UART_Rdy_Ptr( ) )
    {
       rx_data = UART_Rd_Ptr( );
    }

    if ( rx_data > 0 )
    {
        switch ( rx_data )
        {
            case '+': 
            {
                f += 10;
                freq_data = f << 14;
                waveform2_set_freq( freq_data );
                rx_data = 0;
                mikrobus_logWrite( ">> Increasing the frequency ", _LOG_LINE );
                break;
            }

            case '-': 
            {
                if ( f <= 9 )
                { 
                    f = 0;
                }
                f -= 10;
                freq_data = f << 14;
                waveform2_set_freq( freq_data );
                rx_data = 0;
                mikrobus_logWrite( ">> Decreasing the frequency ", _LOG_LINE );
                break;
            }

            case 't': 
            {
                waveform2_triangle_output( );
                rx_data = 0;
                mikrobus_logWrite( ">> Triangle output ", _LOG_LINE );
                break;
            }

            case 's': 
            {
                waveform2_sine_output( );
                rx_data = 0;
                mikrobus_logWrite( ">> Sinusoid output ", _LOG_LINE );
                break;
            }
        }
    }
    rx_data = 0;
}

Additional Functions : aprox_freq_calculation( ) - This function is used to calculate the aproximate value that will be written to the frequency set register.

Other mikroE Libraries used in the example:

• UART Library
• I2C Library
• SPI Library
• Conversions Library

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.