FLEXCOM USART interrupt

This example application shows how to use the flexcom module in USART mode.

Description

This application configures the flexcom peripheral in USART mode and performs read and write operation in a non-blocking manner. The peripheral interrupt is used to manage the transfer. It receives 10 characters from the terminal window and echoes them back.

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_usart_echo_interrupt/firmware .

To build the application, refer to the following table and open the project using its IDE.

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.

Setting up SAMA5D2 Xplained Ultra Evaluation Kit

Setting up the board

• Short jumper JP2 (DEBUG_DIS)
• Connect the Debug USB port on the board to the computer using a micro USB cable

• Connect USB UART click board to SAM A5D2 Xplained Ultra board as per below Pin Connections

  SAM A5D2 Xplained Ultra board Pins	USB UART click board Pins
  F0_TXD, J22 connector	RX
  F0_RXD, J22 connector	TX
  PIN 20, XPRO EXT2 connector	3.3V
  PIN 19, XPRO EXT2 connector	GND

• Connect the Mini USB connector on the USB UART click board to the computer using a Mini USB cable

Running the Application

1. Build the application using its IDE
2. Open the Terminal application (Ex.:Tera term) on the computer.
3. Connect to the EDBG/Jlink Virtual COM port and configure the serial settings as follows:
   • Baud : 115200
   • Data : 8 Bits
   • Parity : None
   • Stop : 1 Bit
   • Flow Control : None

4. The console displays the following message

   

5. Type 10 characters
6. Entered characters will be echoed back and the LED is toggled

7. The following table provides the LED names

   Board	LED Name
   SAMA5D2 Xplained Ultra Evaluation Kit	RGB_LED(Green)

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