UART MUX 4 Click

UART MUX 4 Click is a compact add-on board that switches the UART pins (RX and TX) from the mikroBUS™ socket to one of the two available outputs. This board features the 74HC4066D, a quad single-pole, single-throw analog switch from Nexperia. The UART MUX 4 Click allows you to switch from one multiplexed UART to another easily, but not both simultaneously.

Click Product page

Click library

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

Software Support

We provide a library for the UART MUX 4 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 UART MUX 4 Click driver.

Standard key functions :

• uartmux4_cfg_setup Config Object Initialization function.

  void uartmux4_cfg_setup ( uartmux4_cfg_t *cfg );

• uartmux4_init Initialization function.

  err_t uartmux4_init ( uartmux4_t *ctx, uartmux4_cfg_t *cfg );

Example key functions :

• uartmux4_enable_uart1 UART MUX 4 enable the UART 1 function.

  void uartmux4_enable_uart1 ( uartmux4_t *ctx );

• uartmux4_enable_uart2 UART MUX 4 enable the UART 2 function.

  void uartmux4_enable_uart2 ( uartmux4_t *ctx );

Example Description

This example demonstrates the use of UART MUX 4 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 UART driver and additional pins.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    uartmux4_cfg_t uartmux4_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.
    uartmux4_cfg_setup( &uartmux4_cfg );
    UARTMUX4_MAP_MIKROBUS( uartmux4_cfg, MIKROBUS_1 );
    if ( UART_ERROR == uartmux4_init( &uartmux4, &uartmux4_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    Delay_ms ( 100 );
}

Application Task

Writes demo message, echos it back, processes all incoming data and displays them on the USB UART.

void application_task ( void ) 
{
    log_printf( &logger, " ---------------- \r\n" );
    log_printf( &logger, " UART 1 demo message:\r\n" );
    uartmux4_enable_uart1( &uartmux4 );
    Delay_ms ( 100 );
    for ( uint8_t n_cnt = 0; n_cnt < 5; n_cnt++ )
    {
        if ( uartmux4_generic_write ( &uartmux4, DEMO_MESSAGE, sizeof( DEMO_MESSAGE ) ) )
        {
            if ( uartmux4_generic_read( &uartmux4, app_buf, sizeof( DEMO_MESSAGE ) ) )
            {
                log_printf( &logger, "%s", app_buf );
            }
        }
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }

    log_printf( &logger, " ---------------- \r\n" );
    log_printf( &logger, " UART 2 demo message:\r\n" );
    uartmux4_enable_uart1( &uartmux4 );
    Delay_ms ( 100 );
    for ( uint8_t n_cnt = 0; n_cnt < 5; n_cnt++ )
    {
        if ( uartmux4_generic_write ( &uartmux4, DEMO_MESSAGE, sizeof( DEMO_MESSAGE ) ) )
        {
            if ( uartmux4_generic_read( &uartmux4, app_buf, sizeof( DEMO_MESSAGE ) ) )
            {
                log_printf( &logger, "%s", app_buf );
            }
        }
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }
}

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.UARTMUX4

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.