rs232

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RS232 click

RS232 click provides an interface between the TTL/CMOS logic levels commonly used on microcontrollers and the RS-232 bus.

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Click library

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

Software Support

We provide a library for the Rs232 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 Rs232 Click driver.

Standard key functions :

• Config Object Initialization function.

void rs232_cfg_setup ( rs232_cfg_t *cfg );

• Initialization function.

RS232_RETVAL rs232_init ( rs232_t *ctx, rs232_cfg_t *cfg );

Example key functions :

• Generic write function.

void rs232_generic_write ( rs232_t *ctx, char *data_buf, uint16_t len );

• Generic read function.

int32_t rs232_generic_read ( rs232_t *ctx, char *data_buf, uint16_t max_len );

Examples Description

This example reads and processes data from RS232 clicks.

The demo application is composed of two sections :

Application Init

Initializes driver.

void application_init ( void )
{
    log_cfg_t log_cfg;
    rs232_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.

    rs232_cfg_setup( &cfg );
    RS232_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    rs232_init( &rs232, &cfg );
    
    Delay_ms ( 100 );
#ifdef RS232_RECEIVER
    log_printf( &logger, " ** RS232 Receiver **\r\n" );
#endif
    
#ifdef RS232_TRANSMITTER
    log_printf( &logger, " ** RS232 Transmitter **\r\n" );
#endif
}
  

Application Task

Depending on the selected mode (receiver/transmitter) this function reads/sends an appropriate message. All data is displayed on USB UART.

void application_task ( void )
{
#ifdef RS232_RECEIVER
    rsp_size = rs232_generic_read( &rs232, uart_rx_buffer, PROCESS_RX_BUFFER_SIZE );

    if ( rsp_size == strlen( message ) )
    {  
        log_printf( &logger, "Message received: %s", uart_rx_buffer );
        log_printf( &logger, "\r\n-------------------------\r\n" );
        memset( uart_rx_buffer, 0, rsp_size );
    }  
    Delay_ms ( 100 );
#endif
    
#ifdef RS232_TRANSMITTER
    rs232_generic_write( &rs232, message, strlen( message ) );
    log_printf( &logger, "Message sent: %s", message );
    log_printf( &logger, "\r\n-------------------------\r\n" );
    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.Rs232

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.

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