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Hello, For a project I'm using Commoncpp and its Serial support. But I'm seeing some weird behavior when reading from a serial device (modem). Sometimes after a while, isPending(pendingInput) gives back true and then using uflow for reading one character, results in a EOF. (and this results in a loop) How is this possible? (The device did not send anything). Is it an error on the serial port? How is this possible? Do I something wrong, is it a bug or is it some problem with my system? My system: Linux Ubuntu 9.04 Commoncpp 1.7.3 GCC 4.3.3 Onboard serial port and usb to serialconverter. Siemens and Wavecom modem. Output of the test program: 43 - + 67 - C 82 - R 69 - E 71 - G 58 - : 32 - 49 - 1 13 - 10 - 13 - 10 - 43 - + 87 - W 73 - I 78 - N 68 - D 58 - : 32 - 52 - 4 13 - 10 - -1 - � -1 - � -1 - � <-------- how is this possible?? -1 - � -1 - � I have made a little example to demonstrate the problem. main.cc #include <stdlib.h> #include "Modem.h" /* * */ int main(int argc, char** argv) { Modem modem("/dev/ttyS0"); modem.run(); return (EXIT_SUCCESS); } Modem.h #ifndef _MODEM_H #define _MODEM_H #include <cc++/serial.h> class Modem : ost::ttystream { public: Modem(std::string device); virtual ~Modem(); void run(); private: }; #endif /* _MODEM_H */ Modem.cc #include "Modem.h" Modem::Modem(std::string device) : ost::ttystream((char*)device.c_str()) { interactive(true); if (setSpeed(9600)) std::cout << getErrorString() <<std:: endl; if (setCharBits(8)) std::cout << getErrorString() << std::endl; if (setParity(ost::Serial::parityNone)) std::cout << getErrorString() << std::endl; if (setStopBits(1)) std::cout << getErrorString() << std::endl; if (setFlowControl(ost::Serial::flowHard)) std::cout << getErrorString() << std::endl; } Modem::~Modem() { } void Modem::run() { while(1){ while(isPending(ost::Serial::pendingInput)){ int ch = uflow(); std::cout << (int)ch << " - " << (char)ch << std::endl; } sleep(1); } } Met vriendelijke groet, Mark Ebbers I-Real Postbus 593 7000 AN Doetinchem T: +31 (0)314 366600 F: +31 (0)314 363410 E: m.ebb...@i-real.nl I: www.i-real.nl |
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