USB UART ISO Click

USB UART ISO Click is a compact add-on board that offers a completely isolated differential pair of lines of the USB physical interface. This board features the ISOUSB111, a full/low-speed isolated USB repeater from Texas Instruments. It is a USB 2.0-compliant device that supports low-speed (1.5Mbps) and full-speed (12Mbps) signaling, USB On-The-Go (OtG), and Type-C Dual Role Port (DRP). In addition, this Click board™ comes with the FT232R, a USB UART IC from FTDI, making it a complete USB-to-UART isolated solution.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Jul 2023.
• Type : UART type

Software Support

We provide a library for the USB UART ISO Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for USB UART ISO Click driver.

Standard key functions :

• usbuartiso_cfg_setup Config Object Initialization function.

  void usbuartiso_cfg_setup ( usbuartiso_cfg_t *cfg );

• usbuartiso_init Initialization function.

  err_t usbuartiso_init ( usbuartiso_t *ctx, usbuartiso_cfg_t *cfg );

• usbuartiso_default_cfg Click Default Configuration function.

  void usbuartiso_default_cfg ( usbuartiso_t *ctx );

Example key functions :

• usbuartiso_generic_write USB UART ISO data writing function.

  err_t usbuartiso_generic_write ( usbuartiso_t *ctx, uint8_t *data_in, uint16_t len );

• usbuartiso_generic_read USB UART ISO data reading function.

  err_t usbuartiso_generic_read ( usbuartiso_t *ctx, uint8_t *data_out, uint16_t len );

Example Description

This example demonstrates the use of USB UART ISO Click board by processing the incoming data and displaying them on the USB UART.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    usbuartiso_cfg_t usbuartiso_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.
    usbuartiso_cfg_setup( &usbuartiso_cfg );
    USBUARTISO_MAP_MIKROBUS( usbuartiso_cfg, MIKROBUS_1 );
    if ( UART_ERROR == usbuartiso_init( &usbuartiso, &usbuartiso_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    usbuartiso_default_cfg ( &usbuartiso );
    log_info( &logger, " Application Task " );
}

Application Task

Any data which the host PC sends via UART Terminal will be sent over USB to the Click board and then it will be read and echoed back by the MCU to the PC where the terminal program will display it. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void ) 
{
    char rx_data = 0;
    if ( usbuartiso_generic_read ( &usbuartiso, &rx_data, 1 ) )
    {
        if ( usbuartiso_generic_write ( &usbuartiso, &rx_data, 1 ) )
        {
            log_printf( &logger, "%c", rx_data );
        }
    }
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.USBUARTISO

Additional notes and informations

Depending on the development board you are using, you may need USB UART Click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.