analogkey

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Analog Key Click

Analog Key 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 : MikroE Team
• Date : Dec 2019.
• Type : ADC type

Software Support

Example Description

This example logs which button is pressed.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.AnalogKey

Example Key Functions

• analogkey_cfg_setup Config Object Initialization function.

void analogkey_cfg_setup ( analogkey_cfg_t *cfg );

• analogkey_init Initialization function.

err_t analogkey_init ( analogkey_t *ctx, analogkey_cfg_t *cfg );

• analogkey_get_key This function returns which button is pressed.

uint8_t analogkey_get_key ( analogkey_t* ctx, uint16_t adc_value );

• analogkey_set_resolution This function sets the resolution.

void analogkey_set_resolution ( analogkey_t* ctx, uint8_t resolution );

Application Init

Initializes driver.

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

    analogkey_cfg_setup( &cfg );
    ANALOGKEY_MAP_MIKROBUS( cfg, MIKROBUS_1 );

    analogkey_set_resolution( &analogkey, ANALOGKEY_ADC_RESOLUTION_12bit );
    
    analogkey_init( &analogkey, &cfg );
    Delay_ms ( 100 );

    log_printf(&logger, " Press the button :D\r\n ");

}

Application Task

Reads ADC value and detects which button is pressed based on that value.

void application_task ( void )
{
    float an_voltage = 0;
    analogkey_key_id_t key;
    float an_average = 0;
    
    an_voltage = analogkey_read_voltage( &analogkey );
    
    if ( an_voltage > 0.2 )
    {
        an_average += an_voltage / ANALOGKEY_N_SAMPLES;
        for ( uint8_t cnt = 0; cnt < ANALOGKEY_N_SAMPLES - 1; cnt++ )
        {
            an_voltage = analogkey_read_voltage( &analogkey );
        
            an_average += an_voltage / ANALOGKEY_N_SAMPLES;
        }
    }
    
    if ( ( key = analogkey_get_key( &analogkey, an_average ) ) != ANALOGKEY_TOUCH_KEY_NONE )
    {
        log_printf( &logger, " T%u is pressed.\r\n", (uint16_t)key );
        
        while ( analogkey_read_voltage( &analogkey ) > 0.2 ) {
             Delay_ms ( 1 );   
        }
    
        log_printf( &logger, " T%u is released.\r\n", (uint16_t)key );
        Delay_ms ( 10 );
    }
}

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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