Library Description

Initializes and defines UART bus driver, and defines driver's functions for comunication (reading and writing) between RS485 4 clicks.

Key functions:

• uint8_t rs4854_byteReady() - Check for new byte received
• uint8_t rs4854_readByte() - Read Single Byte
• void rs4854_writeByte(uint8_t input) - Write Single Byte

Examples description

The application is composed of the three sections :

• System Initialization - Initializes UART module and sets RST and CS pin as OUTPUT.
• Application Initialization - Driver intialization.
• Application Task - (code snippet) - Checks if new data byte have received in rx buffer (ready for reading), and if ready than reads one byte from rx buffer. In second case aplication task writes message data via UART.

void applicationTask()
{
    char tmp;
    uint8_t rdyFlag;

// RECEIVER - UART polling 

    rdyFlag = rs4854_byteReady();

    if (1 == rdyFlag)
    {
        tmp = rs4854_readByte();
        mikrobus_logWrite( &tmp, _LOG_BYTE );
    }

// TRANSMITER - TX each 2 sec
/*    for (tmp = 0; tmp < 9; tmp++)
    {
        rs4854_writeByte( MESSAGE_DATA[tmp] );
        mikrobus_logWrite( "MESSAGE SENT", _LOG_LINE );
    }

    Delay_ms(2000);*/
}

Other mikroE Libraries used in the example:

• UART
• Conversions

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.