Touchpad 4 Click

Touchpad 4 Click is a compact add-on board that easily integrates projected capacitive touch into user's applications. This board features the IQS7211A, a tiny capacitive touch controller from Azoteq.

Click Product page

Click library

• Author : Luka Filipovic
• Date : Jun 2021.
• Type : I2C type

Software Support

We provide a library for the Touchpad4 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Touchpad4 Click driver.

Standard key functions :

• touchpad4_cfg_setup Config Object Initialization function.

  void touchpad4_cfg_setup ( touchpad4_cfg_t *cfg );

• touchpad4_init Initialization function.

  err_t touchpad4_init ( touchpad4_t *ctx, touchpad4_cfg_t *cfg );

• touchpad4_default_cfg Click Default Configuration function.

  err_t touchpad4_default_cfg ( touchpad4_t *ctx );

Example key functions :

• touchpad4_reset Reset function.

  void touchpad4_reset ( touchpad4_t *ctx );

• touchpad4_get_touch Read touch informations.

  err_t touchpad4_get_touch ( touchpad4_t *ctx, touchpad4_info_t *touch_info );

• touchpad_get_channels Read channel information.

  err_t touchpad_get_channels ( touchpad4_t *ctx, uint32_t *channels );

Example Description

This example showcases ability of the device to read touch coordinates, active/inactive channels, and gesture informations.

The demo application is composed of two sections :

Application Init

Initialize host communication modules(UART and I2C) and additional pins, for device control. Then resets device and set default configuration where Channels and pins are mapped and configured, and set communication with device only on touch/event. In the end one of 3 examples is set;

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    touchpad4_cfg_t touchpad4_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.
    touchpad4_cfg_setup( &touchpad4_cfg );
    TOUCHPAD4_MAP_MIKROBUS( touchpad4_cfg, MIKROBUS_1 );
    err_t init_flag = touchpad4_init( &touchpad4, &touchpad4_cfg );
    if ( I2C_MASTER_ERROR == init_flag ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    touchpad4_reset( &touchpad4 );

    init_flag = touchpad4_default_cfg ( &touchpad4 );
    if ( TOUCHPAD4_ERROR == init_flag ) 
    {
        log_error( &logger, " Configuration. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    example_selector = TOUCHPAD4_EXAMPLE_TOUCH;

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

Application Task

There are 3 examples that shocaes ability of the device:

• Reading touch coorinates and addinal informations of touch strength, and touch area and logging them,
• Reading channel statuses and show them by logging them,
• Reading gesture events and logging them;

void application_task ( void ) 
{
    if ( !touchpad4_get_ready( &touchpad4 ) )
    {
        switch ( example_selector )
        {
            case TOUCHPAD4_EXAMPLE_TOUCH:
            {
                touchpad4_touch_reading( );
                break;
            }
            case TOUCHPAD4_EXAMPLE_CHANNEL:
            {
                touchpad4_channel_reading( );
                break;
            }
            case TOUCHPAD4_EXAMPLE_GESTURE:
            {
                touchpad4_gesture_reading( );
                break;
            }
            default:
            {
                log_error( &logger, " Select Example" );
                break;
            }
        } 
    }
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Touchpad4

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. UART terminal is available in all MikroElektronika compilers.