2x2 key click

2x2 Key click has a 4 button keypad and allows multiple key presses.

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Click library

• Author : Mihajlo Djordjevic
• Date : Dec 2019.
• Type : GPIO type

Software Support

We provide a library for the 2x2key 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for 2x2key Click driver.

Standard key functions :

• Config Object Initialization function.

  void c2x2key_cfg_setup ( c2x2key_cfg_t *cfg );

• Initialization function.

  C2X2KEY_RETVAL c2x2key_init ( c2x2key_t ctx, c2x2key_cfg_t cfg );

• Click Default Configuration function.

  void c2x2key_default_cfg ( c2x2key_t *ctx );

Example key functions :

• This function gets state of AN pin on 2X2_Key Click board.

  uint8_t c2x2key_t1_state ( c2x2key_t *ctx );

• This function gets state of RST pin on 2X2_Key Click board.

  uint8_t c2x2key_t2_state ( c2x2key_t *ctx );

• This function gets state of CS pin on 2X2_Key Click board.

  uint8_t c2x2key_t3_state ( c2x2key_t *ctx );

• This function gets state of PWM pin on 2X2_Key Click board.

  uint8_t c2x2key_t4_state ( c2x2key_t *ctx );

Examples Description

This example code demonstrates the usage of 2X2 Key Click board.

The demo application is composed of two sections :

Application Init

Application Init performs Logger and Click initialization.

void application_init ( void )
{
    log_cfg_t log_cfg;
    c2x2key_cfg_t cfg;

    /** 
     * 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_printf( &logger, "-- Application  Init --\r\n" );
    Delay_ms ( 1000 );

    //  Click initialization.

    c2x2key_cfg_setup( &cfg );
    C2X2KEY_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    c2x2key_init( &c2x2key, &cfg );

    log_printf( &logger, "-----------------------\r\n" );
    log_printf( &logger, "     2X2 key Click     \r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    Delay_ms ( 1000 );

    log_printf( &logger, "    System is ready    \r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    Delay_ms ( 1000 );
}

Application Task

Application Task detects whether any of the keys is pressed, and results are being sent to the UART Terminal where you can track changes.

void application_task ( void )
{
   t1_state = c2x2key_t1_state( &c2x2key );

   if ( t1_state == 1 && t1_state_old == 0 )
    {
        log_printf( &logger, "-----------------------\r\n" );
        log_printf( &logger, "     Key 1 pressed     \r\n" );
        log_printf( &logger, "-----------------------\r\n" );
        t1_state_old = 1;
    }

    if ( t1_state == 0 && t1_state_old == 1 )
    {
        t1_state_old = 0;
    }

    t2_state = c2x2key_t2_state( &c2x2key );

   if ( t2_state == 1 && t2_state_old == 0 )
    {
        log_printf( &logger, "-----------------------\r\n" );
        log_printf( &logger, "     Key 2 pressed     \r\n" );
        log_printf( &logger, "-----------------------\r\n" );
        t2_state_old = 1;
    }

    if ( t2_state == 0 && t2_state_old == 1 )
    {
        t2_state_old = 0;
    }

    t3_state = c2x2key_t3_state( &c2x2key );

   if ( t3_state == 1 && t3_state_old == 0 )
    {
        log_printf( &logger, "-----------------------\r\n" );
        log_printf( &logger, "     Key 3 pressed     \r\n" );
        log_printf( &logger, "-----------------------\r\n" );
        t3_state_old = 1;
    }

    if ( t3_state == 0 && t3_state_old == 1 )
    {
        t3_state_old = 0;
    }

    t4_state = c2x2key_t4_state( &c2x2key );

   if ( t4_state == 1 && t4_state_old == 0 )
    {
        log_printf( &logger, "-----------------------\r\n" );
        log_printf( &logger, "     Key 4 pressed     \r\n" );
        log_printf( &logger, "-----------------------\r\n" );
        t4_state_old = 1;
    }

    if ( t4_state == 0 && t4_state_old == 1 )
    {
        t4_state_old = 0;
    }
} 

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.2x2key

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.