ascii_serial.h

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#ifndef SENSORS_UTIL_ASCIISERIAL_H
#define SENSORS_UTIL_ASCIISERIAL_H

#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/function.hpp>

#include <string>
#include <iosfwd>

namespace labust
{
        namespace comms
        {
                class ASCIISerial
                {
                        typedef boost::function<void(const std::string&)> CallbackType;

                public:
                        ASCIISerial():
                                port(io),
                                connected(false){};
                        ~ASCIISerial()
                        {
                                io.stop();
                                runner.join();
                        };

                        bool connect(const std::string& port_name, int baud)
                        try
                        {
                                using namespace boost::asio;
                                port.open(port_name);
                                port.set_option(serial_port::baud_rate(baud));
                                port.set_option(serial_port::flow_control(
                                                serial_port::flow_control::none));

                                connected = port.is_open();

                                if (connected)
                                {
                                        //Start the receive cycle
                                        this->startReceive();
                                        runner = boost::thread(boost::bind(&boost::asio::io_service::run,&io));
                                }

                                return connected;
                        }
                        catch (std::exception& e)
                        {
                                std::cerr<<e.what()<<std::endl;
                                throw;
                        }

                        void registerCallback(const CallbackType& callback)
                        {
                                boost::mutex::scoped_lock l(callback_mux);
                                this->callback = callback;
                        };
                        inline bool send(const std::string& msg)
                        {
                                boost::asio::write(port, boost::asio::buffer(msg));
                                return true;
                        }

                private:
                        void onData(const boost::system::error_code& e, std::size_t size)
                        {
                                if (!e)
                                {
                                        std::istream is(&buffer);
                                        std::string data(size,'\0');
                                        is.read(&data[0],size);
                                        if (!callback.empty()) callback(data);
                                }
                                this->startReceive();
                        }

                        void startReceive()
                        {
                                boost::asio::async_read_until(port, buffer,
                                                "\r\n",
                                                boost::bind(&ASCIISerial::onData, this, _1,_2));
                        }

                        boost::asio::io_service io;
                        boost::asio::serial_port port;
                        boost::thread runner;
                        boost::asio::streambuf buffer;
                        bool connected;

                        CallbackType callback;
                        boost::mutex callback_mux;
                };
        }
}

/* SENSORS_UTIL_ASCIISERIAL_H */
#endif