expand19

---

Expand 19 Click

Expand 19 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

---

Click Library

• Author : Stefan Filipovic
• Date : Aug 2024.
• Type : I2C type

Software Support

Example Description

This example demonstrates the use of Expand 19 Click board by setting and reading the port state.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.Expand19

Example Key Functions

• expand19_cfg_setup Config Object Initialization function.

void expand19_cfg_setup ( expand19_cfg_t *cfg );

• expand19_init Initialization function.

err_t expand19_init ( expand19_t *ctx, expand19_cfg_t *cfg );

• expand19_default_cfg Click Default Configuration function.

err_t expand19_default_cfg ( expand19_t *ctx );

• expand19_set_pin_direction This function sets the direction of the selected pins.

err_t expand19_set_pin_direction ( expand19_t *ctx, uint8_t direction, uint8_t pin_mask );

• expand19_set_all_pins_value This function sets the value of all output pins.

err_t expand19_set_all_pins_value ( expand19_t *ctx, uint8_t set_mask );

• expand19_read_port_value This function reads the value of all input pins.

err_t expand19_read_port_value ( expand19_t *ctx, uint8_t *data_out );

Application Init

Initializes the driver and performs the Click default configuration which sets the pins 0-3 as output and others as input with pull-up enabled.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    expand19_cfg_t expand19_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.
    expand19_cfg_setup( &expand19_cfg );
    EXPAND19_MAP_MIKROBUS( expand19_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == expand19_init( &expand19, &expand19_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( EXPAND19_ERROR == expand19_default_cfg ( &expand19 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Sets the output pins and then reads the status of all pins 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 = EXPAND19_PIN_0_MASK; pin_num <= EXPAND19_PIN_3_MASK; pin_num <<= 1 )
    {
        expand19_set_all_pins_value( &expand19, pin_num );
        
        expand19_read_port_value( &expand19, &port_value );
        log_printf( &logger, " Port status: 0x%.2X\r\n", ( uint16_t ) port_value );
        
        Delay_ms( 1000 );
    }
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

---