Library Description

The library covers all the necessary functions to control TouchKey click board. TouchKey click
communicates with the target board through the AN, RST, PWM and INT line. This library 
offers functions for detecting the states of any and every of the four keys on this click board.

Key functions:

• uint8_t touchkey_A(); - Function gets state of RST pin on TouchKey Click board.
• uint8_t touchkey_B();- Function gets state of AN pin on TouchKey Click board.
• uint8_t touchkey_C(); - Function gets state of INT pin on TouchKey Click board.

• uint8_t touchkey_D(); - Function gets state of INT pin on TouchKey Click board.

Examples description

The application is composed of three sections:

• System Initialization - Initializes GPIO and LOG structures, sets AN, RST, PWM and INT pins as input.
• Application Initialization -  Initialization driver enables GPIO and also starts write log.
• Application Task - (code snippet) This example demonstrates the use of TouchKey Click board.
       Detects whether any of the keys is pressed. Results are being sent to the Usart Terminal,
       where you can track changes.

void applicationTask() 
{
    keyState = touchkey_A() | touchkey_B() | touchkey_C() | touchkey_D();
    
    if( keyState == 1 && keyStateOld == 0  )
    {
    mikrobus_logWrite( "Pressed : ", _LOG_TEXT );

        if( touchkey_A() )
        {
            mikrobus_logWrite( "A ", _LOG_TEXT );
        }

        if( touchkey_B() )
        {
            mikrobus_logWrite( "B ", _LOG_TEXT );
        }

        if( touchkey_C() )
        {
            mikrobus_logWrite( "C ", _LOG_TEXT );
        }

        if( touchkey_D() )
        {
            mikrobus_logWrite( "D ", _LOG_TEXT );
        }

    mikrobus_logWrite( "", _LOG_LINE );
    keyStateOld = 1;
    }
    if ( keyState == 0 && keyStateOld == 1 )
    {
        keyStateOld = 0;
    }
}  

Other mikroE Libraries used in the example:

• I2C
• UART
• Conversion

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

• uint8_t touchkey_C(); - Function gets state of INT pin on TouchKey Click board.