TouchPad 2 Click

Touchpad 2 Click is a compact add-on board that easily integrates projected capacitive touch into their applications. This board features the IQS525, a projected capacitive touch and proximity trackpad/touchscreen controller from Azoteq. It features best in class sensitivity, signal-to-noise ratio, and automatic tuning of electrodes, in addition to the multi-touch and multi-hover feature. This Click board™ is characterized by embedded gesture engine recognition for simple gestures (tap, swipes, hold), as well as built-in noise detection and filtering.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Feb 2021.
• Type : I2C type

Software Support

We provide a library for the TouchPad2 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 TouchPad2 Click driver.

Standard key functions :

• touchpad2_cfg_setup Config Object Initialization function.

  void touchpad2_cfg_setup ( touchpad2_cfg_t *cfg );

• touchpad2_init Initialization function.

  TOUCHPAD2_RETVAL touchpad2_init ( touchpad2_t *ctx, touchpad2_cfg_t *cfg );

• touchpad2_default_cfg Click Default Configuration function.

  void touchpad2_default_cfg ( touchpad2_t *ctx );

Example key functions :

• touchpad2_check_version TouchPad 2 check version function.

  err_t touchpad2_check_version ( touchpad2_t *ctx, touchpad2_ver_info_t *ver_info );

• touchpad2_get_touch TouchPad 2 get touch function.

  err_t touchpad2_get_touch ( touchpad2_t *ctx, touchpad2_touch_t *touch_data );

Example Description

This library contains API for the TouchPad 2 Click driver. The library contains drivers to get touch details, the number of touches, X and Y coordinates and touch strength.

The demo application is composed of two sections :

Application Init

Initializes I2C driver, check communication and reads device version information.

void application_init ( void ) {
    log_cfg_t log_cfg;              /**< Logger config object. */
    touchpad2_cfg_t touchpad2_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.

    touchpad2_cfg_setup( &touchpad2_cfg );
    TOUCHPAD2_MAP_MIKROBUS( touchpad2_cfg, MIKROBUS_1 );
    err_t init_flag = touchpad2_init( &touchpad2, &touchpad2_cfg );
    if ( init_flag == I2C_MASTER_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    touchpad2_default_cfg ( &touchpad2 );
    log_info( &logger, " Application Task " );
    Delay_ms ( 1000 );

    touchpad2_check_version( &touchpad2, &ver_info );
    Delay_ms ( 100 );

    if ( ver_info.product_num != TOUCHPAD2_IQS525_PRODUCT_NUMBER ) {
        log_error( &logger, " Communication Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    log_printf( &logger, "------------------------\r\n" );
    log_printf( &logger, " Product number : %u \r\n", ver_info.product_num );
    log_printf( &logger, " Project number : %u \r\n", ver_info.projec_num );
    log_printf( &logger, " Version        : %.1f \r\n", ver_info.version );
    log_printf( &logger, " HW ID          : %u \r\n", ver_info.hw_id );
    log_printf( &logger, " HW Revision    : %u \r\n", ver_info.hw_revision );
    log_printf( &logger, "------------------------\r\n" );
    Delay_ms ( 1000 );

    log_printf( &logger, " Waiting for a new touch\r\n" );
    log_printf( &logger, "------------------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

This is an example that demonstrates the use of the TouchPad 2 Click board. Read XY data consisting of a status byte, the number of touches, X and Y coordinates and touch strength data. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( void ) {

    touchpad2_wait_ready( &touchpad2 );

    touchpad2_get_touch ( &touchpad2, &touch_data );
    Delay_ms ( 100 );

    if ( ( touch_data.id_tag == TOUCHPAD2_ID_TAG_TOUCH_1 ) || 
         ( touch_data.id_tag == TOUCHPAD2_ID_TAG_TOUCH_2 ) ||
         ( touch_data.id_tag == TOUCHPAD2_ID_TAG_TOUCH_3 ) ||
         ( touch_data.id_tag == TOUCHPAD2_ID_TAG_TOUCH_4 ) ||
         ( touch_data.id_tag == TOUCHPAD2_ID_TAG_TOUCH_5 ) ) {
        log_printf( &logger, "  Number of touches : %d \r\n", ( uint16_t ) touch_data.no_of_fingers );
        log_printf( &logger, "- - - - - - - - - - - - -\r\n" );
        log_printf( &logger, "  Coordinate X = %d \r\n", touch_data.x_pos );
        log_printf( &logger, "  Coordinate Y = %d \r\n", touch_data.y_pos );
        log_printf( &logger, "- - - - - - - - - - - - -\r\n" );
        log_printf( &logger, "  Touch Strength   : %u  \r\n", ( uint16_t ) touch_data.touch_str );
        log_printf( &logger, "------------------------ \r\n" );
        Delay_ms ( 500 );    
    }
}

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.TouchPad2

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.