Cap Extend click

Cap Extend click is a mikroBUS add-on board with a SEMTECH SX8633 low power, capacitive button touch controller. It has 12 pins for connecting capacitive inputs (either touch-buttons or proximity sensors).

click Product page

Click library

• Author : MikroE Team
• Date : Dec 2019.
• Type : I2C type

Software Support

We provide a library for the CapExtend 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 CapExtend Click driver.

Standard key functions :

• Config Object Initialization function.

  void capextend_cfg_setup ( capextend_cfg_t *cfg );

• Initialization function.

  CAPEXTEND_RETVAL capextend_init ( capextend_t ctx, capextend_cfg_t cfg );

• Click Default Configuration function.

  void capextend_default_cfg ( capextend_t *ctx );

Example key functions :

• This function does a software reset of the click module.

  void capextend_reset ( capextend_t *ctx );

• This function reads the MSB button map data.

  int8_t capextend_read_msb_buttons ( capextend_t *ctx );

• This function reads the LSB button map data.

  int8_t capextend_read_lsb_buttons ( capextend_t *ctx );

Examples Description

This example showcases the initialization and configuration of the logger and click modules and later on shows how to read and display the 16-bit button map ( LSB + MSB ).

The demo application is composed of two sections :

Application Init

This function initializes and configures the click and logger modules.

void application_init ( )
{
    log_cfg_t log_cfg;
    capextend_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_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    capextend_cfg_setup( &cfg );
    CAPEXTEND_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    capextend_init( &capextend, &cfg );
    capextend_reset( &capextend );
}

Application Task

This function collects map data and displays the 16-bit button map, where each bit that has the value 1 represents a button that has been pressed.

void application_task ( )
{
    uint8_t msb;
    uint8_t lsb;

    msb = capextend_read_msb_buttons( &capextend );
    lsb = capextend_read_lsb_buttons( &capextend );

    // LSB

    log_printf( &logger, " * ---------LSB--------- * \r\n" );
    log_printf( &logger, " * | %d", ( lsb & 0x80 ) >> 7 );
    log_printf( &logger, " %d", ( lsb & 0x40 ) >> 6 );
    log_printf( &logger, " %d", ( lsb & 0x20 ) >> 5 );
    log_printf( &logger, " %d |",( lsb & 0x10 ) >> 4 );
    log_printf( &logger, " %d", ( lsb & 0x08 ) >> 3 );
    log_printf( &logger, " %d", ( lsb & 0x04 ) >> 2 );
    log_printf( &logger, " %d", ( lsb & 0x02 ) >> 1 );
    log_printf( &logger, " %d | * \r\n", lsb & 0x01 );

    // MSB

    log_printf( &logger, " * ---------MSB--------- * \r\n" );
    log_printf( &logger, " * | %d", ( msb & 0x80 ) >> 7 );
    log_printf( &logger, " %d", ( msb & 0x40 ) >> 6 );
    log_printf( &logger, " %d", ( msb & 0x20 ) >> 5 );
    log_printf( &logger, " %d |",( msb & 0x10 ) >> 4 );
    log_printf( &logger, " %d", ( msb & 0x08 ) >> 3 );
    log_printf( &logger, " %d", ( msb & 0x04 ) >> 2 );
    log_printf( &logger, " %d", ( msb & 0x02 ) >> 1 );
    log_printf( &logger, " %d | * \r\n", msb & 0x01 );

    log_printf( &logger, " * ----------------------- * \r\n\r\n" );
    Delay_ms ( 500 );
} 

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.CapExtend

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.