RS485 4 click

RS485 4 Click offers an UART to RS485 signal conversion, featuring the ADM2795E specialized IC with the complete galvanic isolation.

click Product page

Click library

• Author : MikroE Team
• Date : Apr 2020.
• Type : UART GPS/GNSS type

Software Support

We provide a library for the Rs4854 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Rs4854 Click driver.

Standard key functions :

• Config Object Initialization function.

  void rs4854_cfg_setup ( rs4854_cfg_t *cfg );

• Initialization function.

  RS4854_RETVAL rs4854_init ( rs4854_t ctx, rs4854_cfg_t cfg );

Example key functions :

• Rx disable function.

  void rs4854_rx_disable ( rs4854_t *ctx );

• Tx enable function.

  void rs4854_tx_enable ( rs4854_t *ctx );

• Function for send command

  void rs4854_send_command ( rs4854_t ctx, char command );

Examples Description

This example reads and processes data from RS485 4 clicks.

The demo application is composed of two sections :

Application Init

Initializes driver.

void application_init ( void )
{
    log_cfg_t log_cfg;
    rs4854_cfg_t cfg;

    /** 
     * 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.

    rs4854_cfg_setup( &cfg );
    RS4854_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    rs4854_init( &rs4854, &cfg );
}

Application Task

Reads the received data.

void application_task ( void )
{
#ifdef DEMO_APP_RECEIVER
    rs4854_process( );
#endif    

#ifdef DEMO_APP_TRANSMITER
    rs4854_send_command( &rs4854, TEXT_TO_SEND );
    rs4854_process( );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
#endif    
}  

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Rs4854

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.