1.8 FLEXCOM RS485
This example application shows how to use the FLEXCOM module in RS485 mode.
Description
This example connects two boards through the RS485 interface.
One board acts as the transmitter, and the other acts as the receiver.
Downloading and Building the Application
To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.
Path of the application within the repository is apps/flexcom/usart/flexcom_rs485/firmware.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_a5d29_curiosity.X | MPLAB X project for SAMA5D29 Curiosity Development Board Kit |
Setting Up AT91Bootstrap Loader
To load the application binary onto the target device, the user needs to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to configure, build and run bootstrap loader project and use it to bootstrap the application binaries.
Setting Up the Hardware
The following table shows the target hardware for the application projects.
| Project Name | Description |
|---|---|
| sam_a5d29_curiosity.X | SAMA5D29 Curiosity Development Board Kit |
Setting Up SAMA5D29 Curiosity Development Board
- Connect RS485 Xplained Pro Extension Evaluation Kit to the board using wires
- Connect the Debug USB port on the board to the computer using a micro USB cable
- Connect a programming cable from JTAG connector J12 on board to programmer (J-32 Debugger)
- Connect programmer(J-32 Debugger) to computer using a micro USB cable
- Connect the USB port J1 on board to the computer using a micro USB cable (to power the board)
- The hardware setup requires two boards, one acting as the Host and the other as the Client
- Connect the RS485-XPRO
to the J25 socket on the board using wires, following the table
below
ATRS485 J100 SAMA5D29 UART_TX IO0 14 J25: PD12 FLEX4_IO0 UART_RX IO1 13 J25: PD13 FLEX4_IO1 UART RTS IO4 5 J25: PD16 FLEX4_IO4 3.3V 20 J25: 1: 3.3V GND 2 or 19 J25: 39: GND
Running the Application
- Open the Terminal application (e.g., Tera term) on the computer.
- Connect to the USB Serial COM
port and configure the serial settings as follows:
- Baud: 115200
- Data: 8 Bits
- Parity: None
- Stop: 1 Bit
- Flow Control: None
- Build and Program the application using its IDE.
- One board acts as the
transmitter, and the other acts as the receiver.
This is defined by the user.