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 NameDescription
sam_rh71_ek.XSAM 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