color21

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Color 21 Click

Color 21 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 : Stefan Filipovic
• Date : Sep 2025.
• Type : I2C type

Software Support

Example Description

This example demonstrates the use of Color 21 Click by reading and displaying the values from all 14 channels.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.Color21

Example Key Functions

• color21_cfg_setup This function initializes Click configuration structure to initial values.

  void color21_cfg_setup ( color21_cfg_t *cfg );

• color21_init This function initializes all necessary pins and peripherals used for this Click board.

  err_t color21_init ( color21_t *ctx, color21_cfg_t *cfg );

• color21_default_cfg This function executes a default configuration of Color 21 Click board.

  err_t color21_default_cfg ( color21_t *ctx );

• color21_read_data This function checks if the spectral measurement data is ready and then reads data from all channels along with the STATUS and ASTATUS bytes.

  err_t color21_read_data ( color21_t *ctx, color21_data_t *data_out );

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  
    color21_cfg_t color21_cfg;  

    LOG_MAP_USB_UART( log_cfg );
#ifdef INTERFACE_LOGGER_UART
    log_cfg.is_interrupt = false;
#endif
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );
 
    // Click initialization.
    color21_cfg_setup( &color21_cfg );
    COLOR21_MAP_MIKROBUS( color21_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == color21_init( &color21, &color21_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( COLOR21_ERROR == color21_default_cfg ( &color21 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Waits for the spectral measurement complete flag and then reads data from all 14 channels in 3 cycles, and displays the results on the USB UART every 300ms approximately.

void application_task ( void )
{
    color21_data_t color_data;
    if ( COLOR21_OK == color21_read_data ( &color21, &color_data ) )
    {
        log_printf ( &logger, " STATUS:          0x%.2X\r\n", ( uint16_t ) color_data.status );
        log_printf ( &logger, " ASTATUS:         0x%.2X\r\n", ( uint16_t ) color_data.astatus );
        log_printf ( &logger, " ------- Cycle 1 -------\r\n" );
        log_printf ( &logger, " Channel FZ:      %u\r\n", color_data.ch_fz );
        log_printf ( &logger, " Channel FY:      %u\r\n", color_data.ch_fy );
        log_printf ( &logger, " Channel FXL:     %u\r\n", color_data.ch_fxl );
        log_printf ( &logger, " Channel NIR:     %u\r\n", color_data.ch_nir );
        log_printf ( &logger, " Channel 2xVIS_1: %u\r\n", color_data.ch_2x_vis_1 );
        log_printf ( &logger, " Channel FD_1:    %u\r\n", color_data.ch_fd_1 );
        log_printf ( &logger, " ------- Cycle 2 -------\r\n" );
        log_printf ( &logger, " Channel F2:      %u\r\n", color_data.ch_f2 );
        log_printf ( &logger, " Channel F3:      %u\r\n", color_data.ch_f3 );
        log_printf ( &logger, " Channel F4:      %u\r\n", color_data.ch_f4 );
        log_printf ( &logger, " Channel F6:      %u\r\n", color_data.ch_f6 );
        log_printf ( &logger, " Channel 2xVIS_2: %u\r\n", color_data.ch_2x_vis_2 );
        log_printf ( &logger, " Channel FD_2:    %u\r\n", color_data.ch_fd_2 );
        log_printf ( &logger, " ------- Cycle 3 -------\r\n" );
        log_printf ( &logger, " Channel F1:      %u\r\n", color_data.ch_f1 );
        log_printf ( &logger, " Channel F5:      %u\r\n", color_data.ch_f5 );
        log_printf ( &logger, " Channel F7:      %u\r\n", color_data.ch_f7 );
        log_printf ( &logger, " Channel F8:      %u\r\n", color_data.ch_f8 );
        log_printf ( &logger, " Channel 2xVIS_3: %u\r\n", color_data.ch_2x_vis_3 );
        log_printf ( &logger, " Channel FD_3:    %u\r\n", color_data.ch_fd_3 );
        log_printf ( &logger, " -----------------------\r\n\n" );
        Delay_ms ( 300 );
    }
}

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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