vtohz3

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V to Hz 3 Click

V to Hz 3 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

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

Software Support

Example Description

This example demonstrates the use of the V to Hz 3 Click board by calculating the estimated output frequency from the input voltage.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.VtoHz3

Example Key Functions

• vtohz3_cfg_setup Config Object Initialization function.

void vtohz3_cfg_setup ( vtohz3_cfg_t *cfg );

• vtohz3_init Initialization function.

err_t vtohz3_init ( vtohz3_t *ctx, vtohz3_cfg_t *cfg );

• vtohz3_set_input_frequency This function enables and sets output frequency of the programmable oscillator, which is the AD7740 input frequency.

err_t vtohz3_set_input_frequency ( vtohz3_t *ctx, uint32_t freq );

• vtohz3_read_an_pin_voltage This function reads results of AD conversion of the AN pin and converts them to proportional voltage level.

err_t vtohz3_read_an_pin_voltage ( vtohz3_t *ctx, float *data_out );

• vtohz3_get_frequency This function converts voltage to the estimated output frequency in Hz.

uint32_t vtohz3_get_frequency ( vtohz3_t *ctx, float voltage, float vref_in );

Application Init

Initializes the driver and sets the input frequency.

void application_init ( void )
{
    log_cfg_t log_cfg;        /**< Logger config object. */
    vtohz3_cfg_t vtohz3_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.
    vtohz3_cfg_setup( &vtohz3_cfg );
    VTOHZ3_MAP_MIKROBUS( vtohz3_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == vtohz3_init( &vtohz3, &vtohz3_cfg ) ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
    
    vtohz3_set_input_frequency ( &vtohz3, VTOHZ3_DEFAULT_IN_FREQUENCY );
    log_info( &logger, " Application Task " );
}

Application Task

Reads the input voltage from AN pin and calculates the output frequency from it. The results are being displayed on the USB UART approximately once per second.

void application_task ( void )
{
    float voltage;
    if ( VTOHZ3_OK == vtohz3_read_an_pin_voltage ( &vtohz3, &voltage ) ) 
    {
        log_printf( &logger, " Voltage : %.2f V\r\n", voltage );
        log_printf( &logger, " Output frequency : %lu Hz\r\n\n", 
                    vtohz3_get_frequency ( &vtohz3, voltage, VTOHZ3_VREF_INTERNAL_2V5 ) );
    }
    Delay_ms ( 1000 );
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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