captouch4

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Cap Touch 4 Click

Cap Touch 4 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 : Apr 2024.
• Type : I2C type

Software Support

Example Description

This example demonstrates the use of Cap Touch 4 Click board by reading the proximity, touch, and movement events.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.CapTouch4

Example Key Functions

• captouch4_cfg_setup Config Object Initialization function.

void captouch4_cfg_setup ( captouch4_cfg_t *cfg );

• captouch4_init Initialization function.

err_t captouch4_init ( captouch4_t *ctx, captouch4_cfg_t *cfg );

• captouch4_default_cfg Click Default Configuration function.

err_t captouch4_default_cfg ( captouch4_t *ctx );

• captouch4_read_system_flags This function reads the system flags register.

err_t captouch4_read_system_flags ( captouch4_t *ctx, uint8_t *sysflags );

• captouch4_read_cap_counts This function reads the counts number directly proportional to capacitance. The system is calibrated to make the counts as sensitive as possible to changes in capacitance for relative measurements.

err_t captouch4_read_cap_counts ( captouch4_t *ctx, uint16_t *cap_counts );

• captouch4_read_lta This function reads the long-term averate (LTA) value. The LTA is used as reference to compare with capacitance counts.

err_t captouch4_read_lta ( captouch4_t *ctx, uint16_t *lta );

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    captouch4_cfg_t captouch4_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.
    captouch4_cfg_setup( &captouch4_cfg );
    CAPTOUCH4_MAP_MIKROBUS( captouch4_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == captouch4_init( &captouch4, &captouch4_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( CAPTOUCH4_ERROR == captouch4_default_cfg ( &captouch4 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Reads the proximity, touch, and movement events and approximately displays the results on the USB UART every 200ms. The capacitance counts and the long-term average values are also displayed.

void application_task ( void )
{
    uint8_t sys_flags = 0;
    uint8_t movement = 0;
    uint16_t cap_counts = 0;
    uint16_t lta = 0;
    if ( CAPTOUCH4_OK == captouch4_read_system_flags ( &captouch4, &sys_flags ) )
    {
        if ( sys_flags & CAPTOUCH4_SYSFLAGS0_PROX )
        {
            log_printf( &logger, " Proximity detected\r\n" );
        }
        if ( sys_flags & CAPTOUCH4_SYSFLAGS0_TOUCH )
        {
            log_printf( &logger, " Touch detected\r\n" );
        }
        if ( sys_flags & CAPTOUCH4_SYSFLAGS0_MOVEMENT )
        {
            if ( CAPTOUCH4_OK == captouch4_read_movement ( &captouch4, &movement ) )
            {
                log_printf( &logger, " Movement detected: %u\r\n", ( uint16_t ) movement );
            }
        }
        if ( ( sys_flags & CAPTOUCH4_SYSFLAGS0_MOVEMENT ) || 
             ( sys_flags & CAPTOUCH4_SYSFLAGS0_PROX ) || 
             ( sys_flags & CAPTOUCH4_SYSFLAGS0_TOUCH ) )
        {
            if ( CAPTOUCH4_OK == captouch4_read_cap_counts ( &captouch4, &cap_counts ) )
            {
                log_printf( &logger, " Capacitance counts: %u\r\n", cap_counts );
            }
            if ( CAPTOUCH4_OK == captouch4_read_lta ( &captouch4, &lta ) )
            {
                log_printf( &logger, " Long-term average: %u\r\n\n", lta );
            }
        }
        else
        {
            log_printf( &logger, " No detected events\r\n\n" );
        }
    }
    Delay_ms ( 200 );
}

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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