The SPI traffic between a host device and the TRX can be captured using a logic analyzer and processed with the provided plugin to be human-readable. This can greatly reduce the time required to debug and increase the understanding of the structure of communication between a host and the TRX.

Pre-Requisites:

1. A logic analyzer that is compatible with Logic Software
2. Logic Software downloaded and installed
3. Python 3.8+ installed and on the Path

Using the Analyzer:

1. Install the plugin dependencies
   • Execute the following on your command line replacing <SDK_INSTALL_DIR> with the path to your SDK install
     • python -m pip install --upgrade <SDK_INSTALL_DIR>/tools/trx --target <SDK_INSTALL_DIR>/tools/trx/saleae/lib
2. Open Saleae Logic 2.x
   • Open the "Extensions" tab, looks like blocks, right side under Play
   • Clik the vertical ... right next to Play
   • Choose Load existing extension

   • Navigate to and select the extension.json file in <SDK_INSTALL_DIR>/tools/trx/saleae/spitrx

     

     Load Extension

3. Navigate to the Analyzers tab and click the + top right and add a SPI analyzer that takes in SCLK/POCI/PICO/CS_N

   • MSB First
   • 8 Bits per transfer
   • CPOL=0,CPHA=0
   • Enable is active low
   

   SPI Settings

4. Then add a SPITRX analyzer

   • Choose the SPI analyzer to use parsed bytes from, and choose whether to analyze the Host or TRX side
   • Add the other side, either Host or TRX as a separate SPITRX analyzer
   

   SPI TRX Settings

5. See the analyzed frames in the timeline view, the table view and in the terminal view.

   

   SPI TRX Frame