RS232 Isolator 2 Click

RS232 Isolator 2 Click is a compact add-on board that contains a fully isolated transceiver used to provide secure and easy UART to RS232 conversion. This board features the ICL3221, a 3.3V powered RS232 transmitter/receiver that provides ±15kV ESD protection on its RS232 pins from Renesas. This Click board™ is characterized by an assured minimum data rate of 250kbps. It features an automatic power-down function and uses high-speed digital optocouplers to isolate the RS232 interface for 3.75kV isolation. It also possesses an LED indicator that indicates a valid RS232 signal at any of the receiver inputs. This Click board™ is suitable for isolation of RS232 signals, portable equipment, and where the low operational power consumption and even lower standby power consumption are critical.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Jan 2021.
• Type : UART type

Software Support

We provide a library for the Rs232Isolator2 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 Rs232Isolator2 Click driver.

Standard key functions :

• rs232isolator2_cfg_setup Config Object Initialization function.

  void rs232isolator2_cfg_setup ( rs232isolator2_cfg_t *cfg );

• rs232isolator2_init Initialization function.

  RS232ISOLATOR2_RETVAL rs232isolator2_init ( rs232isolator2_t *ctx, rs232isolator2_cfg_t *cfg );

• rs232isolator2_default_cfg Click Default Configuration function.

  void rs232isolator2_default_cfg ( rs232isolator2_t *ctx );

Example key functions :

• rs232isolator2_generic_write RS 232 Isolator 2 data writing function.

  err_t rs232isolator2_generic_write ( rs232isolator2_t *ctx, char *data_buf, uint16_t len );

• rs232isolator2_generic_read RS 232 Isolator 2 data reading function.

  err_t rs232isolator2_generic_read ( rs232isolator2_t *ctx, char *data_buf, uint16_t max_len );

• rs232isolator2_send_data RS 232 Isolator 2 data writing function.

  err_t rs232isolator2_send_data ( rs232isolator2_t *ctx, char *tx_data );

Example Description

This library contains API for RS 232 Isolator 2 Click driver. This example transmits/receives and processes data from RS 232 Isolator 2 clicks. The library initializes and defines the UART bus drivers to transmit or receive data.

The demo application is composed of two sections :

Application Init

Initializes driver and wake-up module.

void application_init ( void ) {
    log_cfg_t log_cfg;  /**< Logger config object. */
    rs232isolator2_cfg_t rs232isolator2_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.

    rs232isolator2_cfg_setup( &rs232isolator2_cfg );
    RS232ISOLATOR2_MAP_MIKROBUS( rs232isolator2_cfg, MIKROBUS_1 );
    err_t init_flag  = rs232isolator2_init( &rs232isolator2, &rs232isolator2_cfg );
    if ( init_flag == UART_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    app_buf_len = 0;
    app_buf_cnt = 0;
    log_info( &logger, " Application Task " );

    #ifdef TRANSMITTER

        log_printf( &logger, "    Send data:    \r\n" );
        log_printf( &logger, "      mikroE      \r\n" );
        log_printf( &logger, "------------------\r\n" );
        log_printf( &logger, "  Transmit data   \r\n" );
        Delay_ms ( 1000 );

    #endif

    #ifdef RECIEVER

        log_printf( &logger, "   Receive data  \r\n" );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );

    #endif

    log_printf( &logger, "------------------\r\n" );
}

Application Task

Transmitter/Receiver task depend on uncommented code. Receiver logging each received byte to the UART for data logging, while transmitted send messages every 2 seconds.

void application_task ( void ) {

    #ifdef TRANSMITTER

    rs232isolator2_send_data( &rs232isolator2, demo_message );
    log_printf( &logger, "%s", demo_message );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, "------------------\r\n" );    

    #endif

    #ifdef RECIEVER

    rs232isolator2_process( );

    if ( app_buf_len > 0 ) {
        log_printf( &logger, "%s", app_buf );
        rs232isolator2_clear_app_buf(  );
    }

    #endif
}

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.Rs232Isolator2

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.