expand2

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Expand 2 Click

Expand 2 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.

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Click Library

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

Software Support

Example Description

This application demonstrates the use of the Expand 2 Click board.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.Expand2

Example Key Functions

• expand2_cfg_setup Config Object Initialization function.

void expand2_cfg_setup ( expand2_cfg_t *cfg );

• expand2_init Initialization function.

err_t expand2_init ( expand2_t *ctx, expand2_cfg_t *cfg );

• expand2_default_cfg Click Default Configuration function.

void expand2_default_cfg ( expand2_t *ctx );

• expand2_set_bit_port_a Function set bit to 8-bit register address from PORTA of MCP23017 chip.

void expand2_set_bit_port_a ( expand2_t *ctx, uint8_t module_address, uint8_t bit_mask );

• expand2_toggle_bit_port_a Function toggle bit from 8-bit register address from PORTA of MCP23017 chip.

void expand2_toggle_bit_port_a ( expand2_t *ctx, uint8_t module_address, uint8_t bit_mask );

• expand2_clear_bit_port_a Function clear bit from 8-bit register address from PORTA of MCP23017 chip.

void expand2_clear_bit_port_a ( expand2_t *ctx, uint8_t moduleAddress, uint8_t bitMask );

Application Init

Initializes the driver and logger, and then sets the Click default configuration: PORTA as output, PORTB as input with pull-ups on all pins.

void application_init ( void )
{
    log_cfg_t log_cfg;
    expand2_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.

    expand2_cfg_setup( &cfg );
    EXPAND2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    expand2_init( &expand2, &cfg );

    expand2_default_cfg ( &expand2 );

    log_printf( &logger, "----------------\r\n" );
    log_printf( &logger, " Expand 2 Click \r\n" );
    log_printf( &logger, "----------------\r\n" );

    Delay_ms ( 100 );
}

Application Task

Sets other pin of PORTA every 3 seconds, then reads and displays the status of both ports on USB UART.

void application_task ( void )
{
    //  Task implementation.

    uint8_t port_status;
    uint8_t pin_position;

    for ( pin_position = 0; pin_position < 8; pin_position++ )
    {
        expand2_set_port_a( &expand2, EXPAND2_I2C_MODULE_ADDRESS_0, pin_position );
        
        port_status = expand2_read_port_a( &expand2, EXPAND2_I2C_MODULE_ADDRESS_0 );

        log_printf( &logger, " Status PA (output): %d\r\n", (uint16_t) port_status );
        
        port_status = expand2_read_port_b( &expand2, EXPAND2_I2C_MODULE_ADDRESS_0 );

        log_printf( &logger, " Status PB (input) : %d  \r\n", (uint16_t) port_status );
        log_printf( &logger, "----------------\r\n" );
        
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        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.

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