1.14 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/flexcom_rs485/firmware.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_9x60_curiosity.X | MPLABX project for SAM9X60 Curiosity Development Board |
Setting Up AT91Bootstrap Loader
To load the application binary onto the target device, we need 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_9x60_curiosity.X | SAM9X60 Curiosity Development Board |
Setting Up SAM9X60 Curiosity Development Board
- Connect www.microchip.com/en-us/development-tool/atrs485-xpro to 9X60 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 RX485-XPRO to
the mikroBUS socket on the board using wires, following the table
below
ATRS485 J100 mikroBUS 1 SAM9X60 UART_TX IO0 14 MOSI PA22 FLEX5_IO0 UART_RX IO1 13 MISO PA21 FLEX5_IO1 UART RTS IO4 5 SDA PA00 FLEX5_IO4 3.3V 20 3.3V 3.3V GND 2 or 19 GND GND
Running the Application
- Open the Terminal application (Ex.: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.