RS232 3 click

RS232 3 Click is a compact add-on board representing a universal usable RS232 transceiver. This board features the SP3221E, a low-power RS232 transceiver from MaxLinear. The SP3221E uses an internal high-efficiency, charge-pump power supply and is compliant with EIA/TIA-232-F standards when powered by any of the mikroBUS™ power rails. The AUTO ON-LINE® feature allows the SP3221E to automatically "Wake-Up" from a Shutdown state when an RS232 cable is connected and a peripheral device is turned on. When not connected or not in use, the SP3221E will automatically shut down, drawing less supply current.

click Product page

Click library

• Author : Stefan Filipovic
• Date : Apr 2022.
• Type : UART type

Software Support

We provide a library for the RS232 3 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 RS232 3 Click driver.

Standard key functions :

• rs2323_cfg_setup Config Object Initialization function.

  void rs2323_cfg_setup ( rs2323_cfg_t *cfg );

• rs2323_init Initialization function.

  err_t rs2323_init ( rs2323_t *ctx, rs2323_cfg_t *cfg );

Example key functions :

• rs2323_generic_write This function writes a desired number of data bytes by using UART serial interface.

  err_t rs2323_generic_write ( rs2323_t *ctx, char *data_buf, uint16_t len );

• rs2323_generic_read This function reads a desired number of data bytes by using UART serial interface.

  err_t rs2323_generic_read ( rs2323_t *ctx, char *data_buf, uint16_t max_len );

Example Description

This example demonstrates the use of an RS232 3 click board by showing the communication between the two click board configured as a receiver and transmitter.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger and displays the selected application mode.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    rs2323_cfg_t rs2323_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.
    rs2323_cfg_setup( &rs2323_cfg );
    RS2323_MAP_MIKROBUS( rs2323_cfg, MIKROBUS_1 );
    if ( UART_ERROR == rs2323_init( &rs2323, &rs2323_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
#ifdef DEMO_APP_TRANSMITTER
    log_printf( &logger, " Application Mode: Transmitter\r\n" );
#else
    log_printf( &logger, " Application Mode: Receiver\r\n" );
#endif   
    log_info( &logger, " Application Task " );
}

Application Task

Depending on the selected mode, it reads all the received data or sends the desired message every 3 seconds.

void application_task ( void )
{
#ifdef DEMO_APP_TRANSMITTER
    rs2323_generic_write( &rs2323, DEMO_TEXT_MESSAGE, strlen( DEMO_TEXT_MESSAGE ) );
    log_printf( &logger, "%s", ( char * ) DEMO_TEXT_MESSAGE );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 ); 
#else
    uint8_t rx_data;
    if ( rs2323_generic_read( &rs2323, &rx_data, 1 ) > 0 )
    {
        log_printf( &logger, "%c", rx_data );
    }
#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.RS2323

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.