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mikroSDK Library

RS485 2 click

Rating:

6

Author: MIKROE

Last Updated: 2018-06-14

Package Version: 1.0.0.2

mikroSDK Library: 1.0.0.0

Category: RS485

Downloaded: 8349 times

Not followed.

License: MIT license  

RS485 2 click is an RS422/485 transceiver Click board, which can be used as an interface between the TTL level UART and the RS422/485 communication bus.

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  • mikroSDK Library 2.0.0.0
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mikroSDK Library Blog

RS485 2 click

RS485 2 click

Native view of the RS485 2 click board.

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RS 485 2 click

RS 485 2 click

Front and back view of the RS 485 2 click board.

View full image

Library Description

Library initializes and defines GPIO driver and performs control of device voltage.
For more details check the documentation.

Key functions:

  • void rs485_2_writeByte(uint8_t input)  - Write Single Byte.
  • uint8_t rs485_2_readByte() - Read Single Byte.
  • uint8_t ras485_2_byteReady() - Check for new byte received.

Example description

The application is composed of three sections:

  • System Initialization -  Initializes UART module.
  • Application Initialization -  Driver intialization.
  • Application Task - (code snippet) - Checks if new data byte has been received in the RX buffer (ready for reading), and if it has then it reads one byte from the RX buffer. Otherwise, the application task writes the message data via UART.
void applicationTask()
{
 char tmp;
 uint8_t rdyFlag;

// RECEIVER - UART polling 

 rdyFlag = rs485_2_byteReady();

 if (1 == rdyFlag)
 {
 tmp = rs485_2_readByte();
 mikrobus_logWrite( &tmp, _LOG_BYTE );
 }

// TRANSMITER - TX each 2 sec

 for (tmp = 0; tmp < 9; tmp++)
 {
 rs485_2_writeByte( MESSAGE_DATA[tmp] );
 mikrobus_logWrite( "MESSAGE SENT", _LOG_LINE );
 }
 Delay_ms(2000);
}

Other mikroE Libraries used in this example:

  • UART

Additional notes and information

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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