Expand 5 Click

EXPAND 5 Click features a low-voltage 24-bit I2C and SMBus I/O expander. This 24-bit I/O expander is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C serial interface. This Click board™ features the TCA6424A from Texas Instruments, and it operates over a power supply voltage range of 1.65V to 5.5V.

Click Product page

Click library

• Author : MikroE Team
• Date : Jul 2020.
• Type : I2C type

Software Support

We provide a library for the Expand5 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 Expand5 Click driver.

Standard key functions :

• Config Object Initialization function.

  void expand5_cfg_setup ( expand5_cfg_t *cfg );

• Initialization function.

  EXPAND5_RETVAL expand5_init ( expand5_t ctx, expand5_cfg_t cfg );

Example key functions :

• Set all OUTPUT pins' logic levels in all banks function

  void expand5_write_all_banks ( expand5_t *ctx, uint8_t bank0, uint8_t bank1, uint8_t bank2 );

• Get all pin polarity ( normal/inverted ) settings from one bank function

  uint8_t expand5_get_bank_pol ( expand5_t *ctx, uint8_t bank );

• Get a single pin's direction ( I/O ) setting function

  uint8_t expand5_get_pin_dir ( expand5_t *ctx, uint16_t pin );

Examples Description

This example demonstrates the use of Expand 5 Click board.

The demo application is composed of two sections :

Application Init

Initalizes I2C driver, resets the device, configures all pins as output and makes an initial log.

void application_init ( void )
{
    log_cfg_t log_cfg;
    expand5_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.

    expand5_cfg_setup( &cfg );
    EXPAND5_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    expand5_init( &expand5, &cfg );

    Delay_ms ( 100 );

    log_printf( &logger, "------------------- \r\n" );
    log_printf( &logger, "   EXPAND 5 Click   \r\n" );
    log_printf( &logger, "------------------- \r\n" );
    expand5_reset( &expand5 );
    expand5_set_all_dir( &expand5, bank_out, bank_out, bank_out );
    Delay_ms ( 100 );
    log_printf( &logger, "  Pins configured   \r\n" );
    log_printf( &logger, "     as output      \r\n" );
    log_printf( &logger, "------------------- \r\n" );
}

Application Task

This example shows the capabilities of the EXPAND 5 Click by toggling each of the 24 available pins.

void application_task ( void )
{
    for ( pin_num = EXPAND5_P00; pin_num <= EXPAND5_P27; pin_num++ )
    {
        expand5_write_all_banks ( &expand5, bank_low, bank_low, bank_low );
        expand5_write_pin ( &expand5, pin_num, EXPAND5_HIGH );
        log_printf( &logger, "Pin %u is high \r\n", ( uint16_t ) pin_num );

        Delay_ms ( 200 );
        expand5_write_all_banks ( &expand5, bank_low, bank_low, bank_low );
    }
    log_printf( &logger, "------------------- \r\n" );
    Delay_ms ( 1000 );
}

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.Expand5

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.