Custom Module Source

The following is an example source code file for a custom module which implements a custom stream transmitter and receiver as described in stream interfaces documentation. This source code expands the example to expose status variables to the Python layer. Instructions for wrapping these modules in PyRogue Devices are included in Wrapping Custom Module With PyRogue Device.

• Sending Frames

• Receiving Frames

This module is compiled with the Building The Custom Module described in this section.

// Source for MyModule.cpp

#include <rogue/interfaces/stream/Slave.h>
#include <rogue/interfaces/stream/Master.h>
#include <rogue/interfaces/stream/Frame.h>
#include <rogue/interfaces/stream/FrameLock.h>
#include <rogue/interfaces/stream/FrameIterator.h>

// Custom stream slave class
class MyCustomSlave : public rogue::interfaces::stream::Slave {

      // Total frame counter, exposed to Python
      uint32_t frameCount_;

      // Total byte count, exposed to Python
      uint32_t byteCount_;

   public:

      // Create a static class creator to return our custom class wrapped with a shared pointer
      static boost::shared_ptr<MyCustomSlave> create() {
         static boost::shared_ptr<MyCustomSlave> ret = boost::make_shared<MyCustomSlave>();
         return(ret);
      }

      // Return received frame counter
      uint32_t getFrameCount() {
         return frameCount_;
      }

      // Return total bytes received
      uint32_t getTotalBytes() {
         return byteCount_;
      }

      MyCustomSlave() : rogue::interfaces::stream::Slave() {
         frameCount_ = 0;
         byteCount_  = 0;
      }

      // Receive a frame
      void acceptFrame ( boost::shared_ptr<rogue::interfaces::stream::Frame> frame ) {

         // Acquire lock on frame. Will be release when lock class goes out of scope
         rogue::interfaces::stream::FrameLockPtr lock = frame->lock();

         // Increment frame counter
         frameCount_++;

         // Increment byte  counter
         byteCount_ += frame->getPayload();
      }

      // Expose methods to python
      static void setup_python() {
         boost::python::class_<MyCustomSlave, boost::shared_ptr<MyCustomSlave>,
                                              boost::python::bases<rogue::interfaces::stream::Slave>,
                                              boost::noncopyable >("MyCustomSlave",
                                              boost::python::init<>())
            .def("getFrameCount", &MyCustomSlave::getFrameCount)
            .def("getTotalBytes", &MyCustomSlave::getTotalBytes)
         ;
         boost::python::implicitly_convertible<boost::shared_ptr<MyCustomSlave>,
                                              rogue::interfaces::stream::SlavePtr>();
      };
};

// Custom stream master class
class MyCustomMaster : public rogue::interfaces::stream::Master {

      // Total frame counter, exposed to Python
      uint32_t frameCount_;

      // Total byte count, exposed to Python
      uint32_t byteCount_;

      // Frame size configuration
      uint32_t frameSize_;

   public:

      // Create a static class creator to return our custom class wrapped with a shared pointer
      static boost::shared_ptr<MyCustomMaster> create() {
         static boost::shared_ptr<MyCustomMaster> ret = boost::make_shared<MyCustomMaster>();
         return(ret);
      }

      // Standard class creator which is called by create
      MyCustomMaster() : rogue::interfaces::stream::Master() {
         frameCount_ = 0;
         byteCount_  = 0;
         frameSize_  = 0;
      }

      // Return received frame counter
      uint32_t getFrameCount() {
         return frameCount_;
      }

      // Return total bytes received
      uint32_t getTotalBytes() {
         return byteCount_;
      }

      // Set frame size
      void setFrameSize(uint32_t size) {
         frameSize_ = size;
      }

      // Get frame size
      uint32_t getFrameSize() {
         return frameSize_;
      }

      // Generate and send a frame
      void myFrameGen() {
         rogue::interfaces::stream::FramePtr frame;
         rogue::interfaces::stream::FrameIterator it;
         uint32_t x;

         // Here we request a frame capable of holding 100 bytes
         frame = reqFrame(frameSize_,true);

         // Unlike the python API we must now specify the new payload size
         frame->setPayload(frameSize_);

         // Set an incrementing value to the first 10 locations
         x = 0;
         for ( it=frame->begin(); it < frame->end(); ++it ) *it = x++;

         //Send frame
         sendFrame(frame);

         // Increment frame counter
         frameCount_++;

         // Increment byte  counter
         byteCount_ += frameSize_;
      }

      // Expose methods to python
      static void setup_python() {
         boost::python::class_<MyCustomMaster, boost::shared_ptr<MyCustomMaster>,
                                               boost::python::bases<rogue::interfaces::stream::Master>,
                                               boost::noncopyable >("MyCustomMaster",
                                               boost::python::init<>())
            .def("getFrameCount", &MyCustomMaster::getFrameCount)
            .def("getTotalBytes", &MyCustomMaster::getTotalBytes)
            .def("setFrameSize",  &MyCustomMaster::setFrameSize)
            .def("getFrameSize",  &MyCustomMaster::getFrameSize)
            .def("myFrameGen",    &MyCustomMaster::myFrameGen)
         ;
         boost::python::implicitly_convertible<boost::shared_ptr<MyCustomMaster>,
                                               rogue::interfaces::stream::MasterPtr>();
      };
};

// Setup this module in python
BOOST_PYTHON_MODULE(MyModule) {
   PyEval_InitThreads();
   try {
      MyCustomSlave::setup_python();
      MyCustomMaster::setup_python();
   } catch (...) {
      printf("Failed to load module. import rogue first\n");
   }
   printf("Loaded my module\n");
};