Intermediate
20 min
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Transform yourself into the ultimate tech provider using STUSB4700 and PIC18F96J65

One charger to rule them all

USB-C Source Click with UNI Clicker

Published Nov 11, 2023

Click board™

USB-C Source Click

Development board

UNI Clicker

Compiler

NECTO Studio

MCU

PIC18F96J65

Simplify your life with a single USB-C Source charger that can power up all your devices with ease.

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Hardware Overview

How does it work?

USB-C Source Click is based on the STUSB4700, a standalone autonomous USB power delivery controller optimized as a provider to negotiate a given amount of power to be sourced to an inquiring consumer device from STMicroelectronics. Combining high-voltage capability with low power consumption, the STUSB4700 can be safely used in systems that handle high voltage on the VBUS power path. The device integrates internal circuitry on the CC pins that tolerate high voltage and ensures protection up to 22 V in case of an unexpected short circuit with VBUS or in case of connection to a device supplying high voltage on VBUS. This Click board™ is powered from an external power supply voltage terminal to which a fixed voltage value of 24V is applied. After that, an input supply voltage goes through the ST1S14, a step-down monolithic power switching regulator able to deliver up to 3A DC current to the load depending on the application conditions also from

STMicroelectronics. This buck regulator establishes communication with another Sink device via a USB connector representing a Power Delivery Output Connector. In the source power role, the STUSB4700's VBUS_EN_SRC pin enables the outgoing VBUS power when the connection to a sink is established and VBUS is in the valid operating range. The open-drain output allows a PMOS transistor to be driven directly. It also has the VBUS_SENSE pin used to sense VBUS presence, monitor VBUS voltage, and discharge VBUS on the USB Type-C receptacle side. The STUSB4700 communicates with MCU using the standard I2C 2-wire interface that supports transfers up to 400kbit/s (Fast Mode) to configure, control, and read the device's status. It also has the possibility of the USB Power Delivery communication over CC1 and CC2 configuration channel pins used for connection and attachment detection, plug orientation determination, and system configuration management across USB

Type-C cables. Two addresses are available by default (0x28 and 0x29) depending on the setting of the address pin ADDR0 of the STUSB4700 programmed by the user, which determines the LSB of the slave address, and it can be selected by the onboard SMD jumper labeled as ADDR SEL allowing selection of the slave address LSB. Additional functionality, such as Reset and 'Alert' interrupt, is provided and routed at RST and INT pins of the mikroBUS™ socket. The RST pin resets all analog signals, states machine, and reloads configuration, while an interrupt output labeled INT represents alarm output. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used for further development.

USB-C Source Click hardware overview image

Features overview

Development board

UNI Clicker is a compact development board designed as a complete solution that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It supports a wide range of microcontrollers, such as different ARM, PIC32, dsPIC, PIC, and AVR from various vendors like Microchip, ST, NXP, and TI (regardless of their number of pins), four mikroBUS™ sockets for Click board™ connectivity, a USB connector, LED indicators, buttons, a debugger/programmer connector, and two 26-pin headers for interfacing with external electronics. Thanks to innovative manufacturing technology, it allows you to build

gadgets with unique functionalities and features quickly. Each part of the UNI Clicker development kit contains the components necessary for the most efficient operation of the same board. In addition to the possibility of choosing the UNI Clicker programming method, using a third-party programmer or CODEGRIP/mikroProg connected to onboard JTAG/SWD header, the UNI Clicker board also includes a clean and regulated power supply module for the development kit. It provides two ways of board-powering; through the USB Type-C (USB-C) connector, where onboard voltage regulators provide the appropriate voltage levels to each component on the board, or using a Li-Po/Li

Ion battery via an onboard battery connector. All communication methods that mikroBUS™ itself supports are on this board (plus USB HOST/DEVICE), including the well-established mikroBUS™ socket, a standardized socket for the MCU card (SiBRAIN standard), and several user-configurable buttons and LED indicators. UNI Clicker is an integral part of the Mikroe ecosystem, allowing you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

UNI clicker double image

Microcontroller Overview

MCU Card / MCU

default

Type

8th Generation

Architecture

PIC

MCU Memory (KB)

96

Silicon Vendor

Microchip

Pin count

100

RAM (Bytes)

3808

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
Reset
PG6
RST
NC
NC
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
Interrupt
PB0
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PC3
SCL
I2C Data
PC4
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

USB-C Source Click Schematic schematic

Step by step

Project assembly

UNI Clicker front image hardware assembly

Start by selecting your development board and Click board™. Begin with the UNI Clicker as your development board.

UNI Clicker front image hardware assembly
GNSS2 Click front image hardware assembly
SiBRAIN for STM32F745VG front image hardware assembly
Prog-cut hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
UNI Clicker Access MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.

Application Output Step 1

After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.

Application Output Step 3

Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.

Application Output Step 4

Software Support

Library Description

This library contains API for USB-C Source Click driver.

Key functions:

  • usbcsource_hw_reset - HW reset function.

  • usbcsource_get_alert_status - Get alert status function.

  • usbcsource_set_pdo_config - Set PDO configuration function.

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * @file main.c
 * @brief USBCSource Click example
 *
 * # Description
 * This is an example that demonstrates the use of the USB-C Source Click board.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization driver enables - I2C, set hardware reset and default configuration 
 * and display configuration of the five PDOs, also write log.
 *
 * ## Application Task
 * In this example, we show port status, monitoring, and connections.
 * All data logs write on USB uart changes every 5 sec.
 * 
 * Additional Functions :
 * - void display_port_status ( ) - Display port status info.
 * - void display_monitoring_status ( ) - Display monitoring status info.
 * - void display_connection_status ( ) - Display connection status info.
 *
 * @author Stefan Ilic
 *
 */

#include "board.h"
#include "log.h"
#include "usbcsource.h"

static usbcsource_t usbcsource;
static log_t logger;

port_status_t port_status;
monitor_status_t monitor_status;
connection_status_t conn_status;
pdo_config_t pdo_data;

/**
 * @brief USB-C Source display port status.
 * @details This function is used for displaying port status.
 */
void display_port_status ( void );

/**
 * @brief USB-C Source display monitoring status.
 * @details This function is used for displaying monitoring status.
 */
void display_monitoring_status ( void );

/**
 * @brief USB-C Source display connection status.
 * @details This function is used for displaying connection status.
 */
void display_connection_status ( void );

void application_init ( void ) {
    log_cfg_t log_cfg;  /**< Logger config object. */
    usbcsource_cfg_t usbcsource_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.
    usbcsource_cfg_setup( &usbcsource_cfg );
    USBCSOURCE_MAP_MIKROBUS( usbcsource_cfg, MIKROBUS_1 );
    err_t init_flag = usbcsource_init( &usbcsource, &usbcsource_cfg );
    if ( I2C_MASTER_ERROR == init_flag ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    usbcsource_hw_reset( &usbcsource );
    Delay_ms( 500 );
    usbcsource_default_config( &usbcsource );
    Delay_ms( 500 );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    usbcsource_get_pdo_config( &usbcsource, USBCSOURCE_SEL_PDO1, &pdo_data );
    log_printf( &logger, " PDO 1 - Voltage = %.2f V \r\n", pdo_data.vtg_data );
    log_printf( &logger, " PDO 1 - Current = %.2f A \r\n", pdo_data.curr_data );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    usbcsource_get_pdo_config( &usbcsource, USBCSOURCE_SEL_PDO2, &pdo_data );
    log_printf( &logger, " PDO 2 - Voltage = %.2f V \r\n", pdo_data.vtg_data );
    log_printf( &logger, " PDO 2 - Current = %.2f A \r\n", pdo_data.curr_data );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    usbcsource_get_pdo_config( &usbcsource, USBCSOURCE_SEL_PDO3, &pdo_data );
    log_printf( &logger, " PDO 3 - Voltage = %.2f V \r\n", pdo_data.vtg_data );
    log_printf( &logger, " PDO 3 - Current = %.2f A \r\n", pdo_data.curr_data );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    usbcsource_get_pdo_config( &usbcsource, USBCSOURCE_SEL_PDO4, &pdo_data );
    log_printf( &logger, " PDO 4 - Voltage = %.2f V \r\n", pdo_data.vtg_data );
    log_printf( &logger, " PDO 4 - Current = %.2f A \r\n", pdo_data.curr_data );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    usbcsource_get_pdo_config( &usbcsource, USBCSOURCE_SEL_PDO5, &pdo_data );
    log_printf( &logger, " PDO 5 - Voltage = %.2f V \r\n", pdo_data.vtg_data );
    log_printf( &logger, " PDO 5 - Current = %.2f A \r\n", pdo_data.curr_data );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    log_info( &logger, " Application Task " );
}

void application_task ( void ) {
    usbcsource_get_port_status( &usbcsource, &port_status );
    display_port_status( );
    Delay_ms( 100 );
    log_printf( &logger, "- - - - - - - - - - - - - - " );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    usbcsource_get_monitoring_status( &usbcsource, &monitor_status );
    display_monitoring_status( );
    Delay_ms( 100 );
    log_printf( &logger, "- - - - - - - - - - - - - - " );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    
    usbcsource_get_connection_status( &usbcsource, &conn_status );
    display_connection_status( );
    Delay_ms( 100 );
    log_printf( &logger, "- - - - - - - - - - - - - - " );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    Delay_ms( 5000 );
}

void main ( void ) {
    application_init( );

    for ( ; ; ) {
        application_task( );
    }
}

void display_port_status ( void ) {
    log_printf( &logger, " Attached Device   : " );
    
    switch ( port_status.attached_device ) {
        case USBCSOURCE_ATTACHED_DEVICE_NONE_ATT: {
            log_printf( &logger, "No device connected\r\n" );
            break;
        }
        case USBCSOURCE_ATTACHED_DEVICE_SNK_ATT: {
            log_printf( &logger, "Sink device connected\r\n" );
            break;
        }
        case USBCSOURCE_ATTACHED_DEVICE_SRC_ATT: {
            log_printf( &logger, "Source device connected\r\n" );
            break;
        }
        case USBCSOURCE_ATTACHED_DEVICE_DBG_ATT: {
            log_printf( &logger, "Debug accessory device connected\r\n" );
            break;
        }
        case USBCSOURCE_ATTACHED_DEVICE_AUD_ATT: {
            log_printf( &logger, "Audio accessory device connected\r\n" );
            break;
        }
        case USBCSOURCE_ATTACHED_DEVICE_POW_ACC_ATT: {
            log_printf( &logger, "Power accessory device connected\r\n" );
            break;
        }
    }
    
    log_printf( &logger, " Low Power Standby :" ); 
    if ( port_status.low_power_standby == USBCSOURCE_LOW_POWER_STANDBY_ON ) {
        log_printf( &logger, " ON\r\n" );
    } else {
        log_printf( &logger, " OFF\r\n" );
    }

    log_printf( &logger, " Power Mode        :" );
    if ( port_status.power_mode == USBCSOURCE_POWER_MODE_SRC ) {
        log_printf( &logger, " Source\r\n" );
    } else {
        log_printf( &logger, " Sink\r\n" );
    }

    log_printf( &logger, " Data Mode         :" );
    if ( port_status.data_mode == USBCSOURCE_DATA_MODE_DFP ) {
        log_printf( &logger, " DFP\r\n" );
    } else {
        log_printf( &logger, " UFP\r\n" );
    }

    log_printf( &logger, " Attach            :" );
    if ( port_status.attach == USBCSOURCE_CONN_ATTACHED ) {
        log_printf( &logger, " Attached\r\n" );
    } else {
        log_printf( &logger, " Unattached\r\n" );
    }
}

void display_monitoring_status ( void ) {
    log_printf( &logger, " VBUS Ready        :" );
    if ( monitor_status.vbus_ready == USBCSOURCE_VBUS_READY_CONNECTED ) {
        log_printf( &logger, " Connected\r\n" );
    } else {
        log_printf( &logger, " Disconnected\r\n" );
    }

    log_printf( &logger, " VBUS Safe         :" );
    if ( monitor_status.vbus_vsafe0v == USBCSOURCE_VBUS_VSAFE0V_0_8V_LOWER ) {
        log_printf( &logger, " Lower than 0.8V\r\n" );
    } else {
        log_printf( &logger, " Higher than 0.8V\r\n" );
    }

    log_printf( &logger, " VBUS Valid        :" );
    if ( monitor_status.vbus_valid == USBCSOURCE_VBUS_VALID_3_9V_HIGHER ) {
        log_printf( &logger, " Lower than 3.9V\r\n" );
    } else {
        log_printf( &logger, " Higher than 3.9V\r\n" );
    }
}

void display_connection_status ( void ) {
    log_printf( &logger, " Conn. orientation :" );
    if ( conn_status.cc_reverse == 1 ) {
        log_printf( &logger, " Twisted\r\n" );
    } else {
        log_printf( &logger, " Straight\r\n" );
    }

    log_printf( &logger, " Sink Power Level  :" );
    if ( conn_status.snk_power_level == 0 ) {
        log_printf( &logger, " Rp standard current is connected\r\n" );
    } else if ( conn_status.snk_power_level == 1 ) {
        log_printf( &logger, "  Rp 1.5A is connected\r\n" );
    } else {
        log_printf( &logger, "  Rp 3.0A is connected\r\n" );
    }
}

// ------------------------------------------------------------------------ END

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