usbcpower3

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USB-C Power 3 Click

USB-C Power 3 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 : Mar 2026.
• Type : I2C type

Software Support

Example Description

This example demonstrates the use of the USB-C Power 3 Click board for monitoring USB Type-C connection and power status. The application reads CC and power status registers, detects connection changes, and logs detailed information about VBUS state, connection type, and cable orientation.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.USBCPower3

Example Key Functions

• usbcpower3_cfg_setup This function initializes Click configuration structure to initial values.

  void usbcpower3_cfg_setup ( usbcpower3_cfg_t *cfg );

• usbcpower3_init This function initializes all necessary pins and peripherals used for this Click board.

  err_t usbcpower3_init ( usbcpower3_t *ctx, usbcpower3_cfg_t *cfg );

• usbcpower3_ptn_read_info This function reads device identification and revision information from PTN USB PD registers.

  err_t usbcpower3_ptn_read_info ( usbcpower3_t *ctx );

• usbcpower3_ptn_read_reg_byte This function reads one byte from the selected PTN USB PD register using the block read function.

  err_t usbcpower3_ptn_read_reg_byte ( usbcpower3_t *ctx, uint8_t reg, uint8_t *data_out );

• usbcpower3_ptn_write_reg_byte This function writes one byte to the selected PTN USB PD register using the block write function.

  err_t usbcpower3_ptn_write_reg_byte ( usbcpower3_t *ctx, uint8_t reg, uint8_t data_in );

Application Init

Initializes the logger and USB-C Power 3 Click driver, and reads device identification information.

void application_init ( void )
{
    log_cfg_t log_cfg;  
    usbcpower3_cfg_t usbcpower3_cfg;  

    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );
 
    // Click initialization.
    usbcpower3_cfg_setup( &usbcpower3_cfg );
    USBCPOWER3_MAP_MIKROBUS( usbcpower3_cfg, MIKROBUS_POSITION_USBCPOWER3 );
    if ( USBCPOWER3_OK != usbcpower3_init( &usbcpower3, &usbcpower3_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( USBCPOWER3_OK != usbcpower3_ptn_read_info ( &usbcpower3 ) )
    {
        log_error( &logger, " PTN read info." );
        for ( ; ; );
    }
    log_printf( &logger, " --- PTN info ---\r\n" );
    log_printf( &logger, " Vendor ID: 0x%.4X\r\n", usbcpower3.info.vendor_id );
    log_printf( &logger, " Product ID: 0x%.4X\r\n", usbcpower3.info.product_id );
    log_printf( &logger, " Device ID: 0x%.4X\r\n", usbcpower3.info.device_id );
    log_printf( &logger, " USB-C rev: 0x%.4X\r\n", usbcpower3.info.usbtypec_rev );
    log_printf( &logger, " USB-PD rev/ver: 0x%.4X\r\n", usbcpower3.info.usbpd_rev_ver );
    log_printf( &logger, " PD interface rev: 0x%.4X\r\n\n", usbcpower3.info.pd_interface_rev );
 
    log_info( &logger, " Application Task " );
}

Application Task

Continuously monitors CC and power status registers, detects changes, parses connection state, and controls VBUS direction (sink/source) accordingly.

void application_task ( void )
{
    err_t error_flag = USBCPOWER3_OK;
    static uint8_t cc_status_old = 0;
    static uint8_t power_status_old = 0;
    uint8_t cc_status = 0;
    uint8_t power_status = 0;
 
    // Read CC and power status registers
    error_flag = usbcpower3_ptn_read_reg_byte ( &usbcpower3, USBCPOWER3_PTN_REG_CC_STATUS, &cc_status );
    if ( USBCPOWER3_OK == error_flag )
    {
        error_flag = usbcpower3_ptn_read_reg_byte ( &usbcpower3, USBCPOWER3_PTN_REG_POWER_STATUS, &power_status );
    }
    
    // Check if any of them are updated
    if ( ( USBCPOWER3_OK == error_flag ) && 
         ( ( cc_status_old != cc_status ) || ( power_status_old != power_status ) ) )
    {
        cc_status_old = cc_status;
        power_status_old = power_status;
        log_printf ( &logger, "###############################\r\n" );
        usbcpower3_parse_power_status ( power_status );
        error_flag = usbcpower3_parse_cc_status ( &usbcpower3, cc_status );
        log_printf ( &logger, "*******************************\r\n\n" );
    }
    else
    {
        // No updates in status registers, check again in 100ms
        Delay_ms ( 100 );
    }
}

Note

The application automatically handles USB connection and disconnection events, including VBUS control based on detected role.

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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