Library Description

The library covers all the necessary functions to control PS/2 click board.

Key functions:

• void ps2_gpioDriverInit(T_PS2_P gpioObj) - Function initializes GPIO driver for the desired MIKROBUS1.

Examples description

The application is composed of the three sections :

• System Initialization - Initializes GPIO and start to write log.
• Application Initialization - Initialization driver enables - GPIO, also display logs.
• Application Task - This is an example which demonstrates the use of PS/2 Click board. In this example, key(s) pressed on the PS/2 keyboard are read and transferred to the PC through serial port connection. Various basic keyboard activities are tested: "normal" keys, keys with <Shift> pressed, keys with <Caps Lock> pressed, numerical keypad ON/OFF and keys. Results are being sent to the Usart Terminal where you can track their changes.

void applicationTask()
{
    char logText;

    if ( Ps2_Key_Read( &logText, &specialFlag, &pressedState ) )
    {
        if ( pressedState )
        {
            if ( logText == _PS2_BACKSPACE )
            {
                mikrobus_logWrite( " <- Backspace", _LOG_LINE );
            }

            if ( logText == _PS2_ENTER )
            {
                mikrobus_logWrite( "", _LOG_LINE );
            }

            if ( !specialFlag && logText )
            {
                mikrobus_logWrite( &logText, _LOG_BYTE );
            }
        }
    }

    Delay_1ms();
}

Other mikroE Libraries used in the example:

• PS2
• UART

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.