touchkey4

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Touch Key 4 Click

TouchKey 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 : MikroE Team
• Date : Dec 2019.
• Type : I2C type

Software Support

Example Description

This demo performs touch & release detection functionality of the Click.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.TouchKey4

Example Key Functions

• touchkey4_cfg_setup Config Object Initialization function.

void touchkey4_cfg_setup ( touchkey4_cfg_t *cfg );

• touchkey4_init Initialization function.

err_t touchkey4_init ( touchkey4_t *ctx, touchkey4_cfg_t *cfg );

• touchkey4_default_cfg Click Default Configuration function.

void touchkey4_default_cfg ( touchkey4_t *ctx );

• touchkey4_detect_touch This function detects touch on sensor inputs and checks is touch detected or released.

void touchkey4_detect_touch ( touchkey4_t *ctx, uint8_t *input_sens );

• touchkey4_set_active_mode This function puts device in Active mode and enables desired inputs in Active mode.

void touchkey4_set_active_mode ( touchkey4_t *ctx, const uint8_t analog_gain, const uint8_t en_input1,const uint8_t en_input2, const uint8_t en_input3 );

• touchkey4_set_standby_mode This function puts device in Standby mode and enables desired inputs in Standby mode.

void touchkey4_set_standby_mode ( touchkey4_t *ctx, const uint8_t analog_gain, const uint8_t en_input1, const uint8_t en_input2, const uint8_t en_input3 );

Application Init

Device and driver initialization.

void application_init ( void )
{
    log_cfg_t log_cfg;
    touchkey4_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.

    touchkey4_cfg_setup( &cfg );
    TOUCHKEY4_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    touchkey4_init( &touchkey4, &cfg );

    Delay_ms ( 1000 );
    
    touchkey4_default_cfg( &touchkey4 );
    log_info( &logger, "---- Configured and ready ----" );
}

Application Task

Calls function to check touch detection (is interrupt occured) and shows message on USB UART if touch is detected or if touch is released on enabled inputs.

void application_task ( void )
{
    touchkey4_detect_touch( &touchkey4, sensor_results );
    for ( cnt = 0; cnt < 3; cnt++ )
    {
        if ( sensor_results[ cnt ] == 1 )
        {
            if ( cnt == 0 )
            {
                log_info( &logger, "Input 1 is touched\r\n" );
            }
            else if ( cnt == 1 )
            {
                log_info( &logger, "Input 2 is touched\r\n" );
            }
            else
            {
                log_info( &logger, "Input 3 is touched\r\n" );
            }
        }
        else if ( sensor_results[ cnt ] == 2 )
        {
            if ( cnt == 0 )
            {
                log_info( &logger, "Input 1 is released\r\n" );
            }
            else if ( cnt == 1 )
            {
                log_info( &logger, "Input 2 is released\r\n" );
            }
            else
            {
                log_info( &logger, "Input 3 is released\r\n" );
            }
        }
    }
    Delay_ms ( 300 );
}

Note

TouchKey 4 is configured to work in Combo mode (Active and Standby mode). Input 1 is enabled in Active mode, input 3 is enabled in Standby mode, and input 2 is enabled to work in both modes. In this example the interrupt will be generated when touch is detected and when touch is released. Standby mode should be used when fewer sensor inputs are enabled, and when they are programmed to have more sensitivity. Somethimes it is neccessary to cycle the board power supply if Click doesn't work.

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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