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Expand 14 Click

Expand 14 Click is a compact add-on board that contains a multi-port I/O expander. This board features the CAT9555, a CMOS device that provides 16-bit parallel input/output port expansion from ON Semiconductor. The CAT9555 contains two 8-bit configuration ports (input or output), input, output, and polarity inversion registers, alongside an I2C-compatible serial interface. Any of the sixteen I/Os can be configured as an input or output by writing to the configuration register. It also features an active-low interrupt output, indicating to the host controller that an input state has been changed.

Click Product page

Click library

  • Author : Stefan Filipovic
  • Date : Jun 2022.
  • Type : I2C type

Software Support

We provide a library for the Expand 14 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 from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Expand 14 Click driver.

Standard key functions :

  • expand14_cfg_setup Config Object Initialization function.
void expand14_cfg_setup ( expand14_cfg_t *cfg );
  • expand14_init Initialization function.
err_t expand14_init ( expand14_t *ctx, expand14_cfg_t *cfg );
  • expand14_default_cfg Click Default Configuration function.
err_t expand14_default_cfg ( expand14_t *ctx );

Example key functions :

  • expand14_set_pin_direction This function sets the direction of the selected pins.
err_t expand14_set_pin_direction ( expand14_t *ctx, uint8_t direction, uint8_t port, uint8_t pin_mask );
  • expand14_set_all_pins_value This function sets the value of all output pins.
err_t expand14_set_all_pins_value ( expand14_t *ctx, uint8_t set_mask );
  • expand14_read_port_value This function reads the value of the selected port input pins.
err_t expand14_read_port_value ( expand14_t *ctx, uint8_t port, uint8_t *data_out );

Example Description

This example demonstrates the use of Expand 14 Click board by setting and reading the ports state.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click default configuration which sets the port 0 as output and the port 1 as input.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    expand14_cfg_t expand14_cfg;  /**< Click config object. */

    /** 
     * 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.
    expand14_cfg_setup( &expand14_cfg );
    EXPAND14_MAP_MIKROBUS( expand14_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == expand14_init( &expand14, &expand14_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( EXPAND14_ERROR == expand14_default_cfg ( &expand14 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Sets the pins of the port 0 and then reads the status of both ports and displays the results on the USB UART approximately once per second.

void application_task ( void )
{
    uint8_t port_value = 0;
    for ( uint16_t pin_num = EXPAND14_PIN_0_MASK; pin_num <= EXPAND14_PIN_7_MASK; pin_num <<= 1 )
    {
        expand14_set_all_pins_value( &expand14, pin_num );
        
        expand14_read_port_value( &expand14, EXPAND14_PORT_0, &port_value );
        log_printf( &logger, " Status port 0 (output): 0x%.2X\r\n", ( uint16_t ) port_value );
        
        expand14_read_port_value( &expand14, EXPAND14_PORT_1, &port_value );
        log_printf( &logger, " Status port 1 (input) : 0x%.2X\r\n\n", ( uint16_t ) port_value );
        Delay_ms ( 1000 );
    }
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.Expand14

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. UART terminal is available in all MikroElektronika compilers.