rs4855

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RS485 5 Click

RS485 5 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : MikroE Team
• Date : Jun 2020.
• Type : UART type

Software Support

Example Description

This example reads and processes data from RS485 5 Clicks.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.Rs4855

Example Key Functions

• rs4855_cfg_setup Config Object Initialization function.

void rs4855_cfg_setup ( rs4855_cfg_t *cfg );

• rs4855_init Initialization function.

err_t rs4855_init ( rs4855_t *ctx, rs4855_cfg_t *cfg );

• rs4855_generic_write Generic write function.

void rs4855_generic_write ( rs4855_t *ctx, char *data_buf, uint16_t len );

• rs4855_set_de_state Sets DE pin to high or low state.

void rs4855_set_de_state ( rs4855_t *ctx, uint8_t state );

• rs4855_set_re_state Sets RE pin to high or low state.

void rs4855_set_re_state ( rs4855_t *ctx, uint8_t state );

Application Init

Initializes the driver and enables the selected mode.

void application_init ( void )
{
    log_cfg_t log_cfg;
    rs4855_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.

    rs4855_cfg_setup( &cfg );
    RS4855_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    rs4855_init( &rs4855, &cfg );

    Delay_ms ( 100 );

#ifdef DEMO_APP_RECEIVER
    rs4855_set_re_state( &rs4855, RS4855_PIN_STATE_LOW );
    rs4855_set_de_state( &rs4855, RS4855_PIN_STATE_LOW );
    log_info( &logger, "---- Receiver mode ----" );
#endif    
#ifdef DEMO_APP_TRANSMITTER
    rs4855_set_re_state( &rs4855, RS4855_PIN_STATE_HIGH );
    rs4855_set_de_state( &rs4855, RS4855_PIN_STATE_HIGH );
    log_info( &logger, "---- Transmitter mode ----" );
#endif    
}

Application Task

Depending on the selected mode, it reads all the received data or sends the desired message every 2 seconds.

void application_task ( void )
{
#ifdef DEMO_APP_RECEIVER
    rs4855_process( );
#endif    
    
#ifdef DEMO_APP_TRANSMITTER
    rs4855_generic_write( &rs4855, TEXT_TO_SEND, 8 );
    log_info( &logger, "---- Data sent ----" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
#endif  
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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