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# 1.7 SpaceWire Loopback Example

This example shows how to configure the SpaceWire peripheral to send and receive multiple packets. It uses multiple receive buffer to exercise in an optimize way the 3 states (NEXT, CURRENT, PREVIOUS) for packet reception.

Building The Application

The parent folder for all the MPLABX IDE projects for this application is given below:

- Application Path : apps\spw\spw_loopback\firmware

To build the application, refer to the table below and open the appropriate project file in MPLABX IDE.

Project Name | Description
--- | ---
sam_rh71_ek.X | SAM RH71 Evaluation Kit board

MPLAB Harmony Configurations

Refer to the MCC project graph for the components used and the respective configuration options.

Hardware Setup

1. Project sam_rh71_ek.X
   - Hardware Used
     - SAM RH71 Evaluation Kit
     - SpaceWire cable
   - Hardware Setup
     - Connect the debugger probe to J33
     - Connect the USB port on the board to the computer using a mini USB cable.
     - Connect the two SpaceWire link on the board to each other using a SpaceWire cable.

Running The Application

1. Open the Terminal application (Ex.:Tera term) on the computer.

2. Connect to the Virtual COM port and configure the serial settings as follows:

   - Baud : 115200
   - Data : 8 Bits
   - Parity : None
   - Stop : 1 Bit
   - Flow Control : None

3. Build and Program the application using the MPLABX IDE.

4. See the following message in the console.

       -----------------------------------------------------------
       SPW loopback example
       -----------------------------------------------------------
       Wait for both SWP link switch to run state
       SPW Link in Run state
       TX time=2284450 us, for 25000000 bytes
       Effective rate=87 Mb/s
       Average RX process time = 148 us
       Rx sequence errors = 0
       End of transfer