• CIC Prefix : TOUCHPAD
• Author : MikroE Team
• Verison : 1.0.0
• Date : Jul 2018.

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

Library Description

The library contains all the functions required to operate the Touchpad click.

Key functions :

• void touchpad_getPosition( T_touchpad_touchPoint *posData ) - Gets coordinate X and Y of touch and puts them in structure touch_point
• void touchpad_readRegister( uint8_t rAddr, uint8_t *buffer) - Reads register on rAddr address and returns value through buffer
• void touchpad_writeGesture( uint8_t _data, char *str ) - Writes gesture through *str based on red value _data
• void touchpad_readBytes( uint8_t rAddr, uint8_t *buffer, uint8_t nBytes) - Reads register for more bytes on consecutive addresses and returns value through buffer

Examples Description

The application is composed of three sections :

• System Initialization - Initializes I2C module and sets INT pin as OUTPUT and RST pin as INPUT.
• Application Initialization - Initializes driver init.
• Application Task - (code snippet) - Reads every touch and gesture and logs to USBUART_A.

void applicationTask()
{
    Delay_ms( 50 );
    touchpad_readRegister( _TOUCHPAD_TOUCHSTATE, &touchpad_data );
    if( (touchpad_data & _TOUCHPAD_TOUCH_ONLY) != 0 )
    {
        mikrobus_logWrite( "", _LOG_LINE );
        touchpad_getPosition( &touchpad_posData );
        WordToStr( touchpad_posData.posX, touchpad_text );
        mikrobus_logWrite( "Position X: ", _LOG_TEXT );
        mikrobus_logWrite( touchpad_text, _LOG_LINE );
        WordToStr( touchpad_posData.posY, touchpad_text );
        mikrobus_logWrite( "Position Y: ", _LOG_TEXT );
        mikrobus_logWrite( touchpad_text, _LOG_LINE );
        mikrobus_logWrite( "-----------", _LOG_LINE );
        Delay_ms( 50 );
    }
    else if( (touchpad_data & _TOUCHPAD_GESTURE) != 0 )
    {
        Delay_ms( 50 );
        touchpad_readRegister( _TOUCHPAD_GESTURESTATE, &touchpad_data );
        if( touchpad_data != _TOUCHPAD_NO_GESTURE_PRESENT )
        {
            touchpad_writeGesture( touchpad_data, &touchpad_text );
            mikrobus_logWrite( touchpad_text , _LOG_LINE );
        }
    }
}

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

• I2C

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.