Hello!
I work with a note dispenser, which is connected to my computer through COM.
COM board manufacturer: MosChip Semiconductor Technology Ltd.
Port settings by default:
RS232
BaudRate:9600
DataBits:8
Parity:None
StopBits:1
FlowControl:None
Protocol is simple. Program sends strictly defined command, and then should get an answer.
Example:
1. Command 0×30,0×33,0×30,0×0D means reset device.
2. Answer should be (if command was executed successfully): 00000010190502018979301900338.
That is as a literal string. Of course, raw hex result can be obtained by translating every char into hex number.
However, I can’t get any answer from the device.
Manufacturer of note dispenser also provides test program, to use device.
That program works fine.
Below is the link on a log of PortMon. Test program from the development dispenser kit.
http://pastebin.com/vsRQB892
So, as we can see:
1. Basic setup of COM port is different from default settings:
StopBits: 1 Parity: EVEN WordLength: 7
EOF:0 ERR:0 BRK:0 EVT:0 XON:11 XOFF:13
Shake:0 Replace:80000000 XonLimit:409 XoffLimit:410
RI:-1 RM:0 RC:0 WM:0 WC:0
Mask: RXCHAR CTS DSR RLSD BRK ERR RING
2. Initialization of COM is repeated 4 times.
3. Windows messages IOCTL_SERIAL_SET_WAIT_MASK IOCTL_SERIAL_WAIT_ON_MASK.
I disassembled that program by using AidaPro and there was 4 thread in a process. So, maybe 4 times initialization means 4 threads?
Anyway, it seems that test program using async read/write operations.
I use that example: https://qt.gitorious.org/qt/qtserialport/source/dda7449d18cf8aaa542f869dcaea28634d21ecb0:examples/serialport/creaderasync
Also, beware of waitForReadyRead: https://bugreports.qt-project.org/browse/QTBUG-33987
Qt version:4.8.2.
Below is my code:
#include <QtCore/QCoreApplication>
#include <QtCore/QtGlobal>
#include <QObject>
#include <QString>
#include <QByteArray>
#include "qserialport.h"
#include <QDebug>
QT_USE_NAMESPACE
class ComPort : public QObject
{
Q_OBJECT
public:
ComPort(QObject *parent = 0);
~ComPort();
private slots:
void ReadBytes();
void WrittenBytes(qint64 bytes);
public:
void WriteData(const QByteArray & Data);
private:
QSerialPort serial;
};
#include "main.moc"
ComPort::ComPort(QObject *parent) : QObject(parent)
{
serial.setPortName(QString("COM22"));
if (serial.open(QIODevice::ReadWrite))
{
serial.setBaudRate(QSerialPort::Baud9600);
serial.setDataBits(QSerialPort::Data8);
serial.setParity(QSerialPort::NoParity);
serial.setStopBits(QSerialPort::OneStop);
serial.setFlowControl(QSerialPort::NoFlowControl);
connect(&serial, SIGNAL(readyRead()), this, SLOT(ReadBytes()));
connect(&serial, SIGNAL(bytesWritten(qint64)), this, SLOT(WrittenBytes(qint64)));
}
else
{
serial.close();
qDebug() << "Error opening COM port";
}
}
ComPort::~ComPort()
{
serial.close();
}
void ComPort::ReadBytes()
{
qDebug() << "Signal readyRead is emitted and caught successfull:";
QByteArray data = serial.readAll();
qDebug() << data;
}
void ComPort::WrittenBytes(qint64 bytes)
{
qDebug() << "Signal bytesWritten is emitted and caught successfull:" << bytes;
}
void ComPort::WriteData(const QByteArray & Data)
{
if(serial.write(Data)==-1)
qDebug() << "Error in writing";
else
qDebug() << "Writing is successfull";
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
ComPort CP;
QByteArray Data;
Data.push_back(0x30);
Data.push_back(0x33);
Data.push_back(0x30);
Data.push_back(0x0D);
CP.WriteData(Data);
return a.exec();
}
The only string that i managed to get on console is: “Writing is successfull”. No readyRead or bytesWritten signals.
And the link on produced result sniffed by PortMon:
http://pastebin.com/TuD8gHdj
So it stucks after successfull writing.
What I’m doing wrong?
Thanks
↧
