Qt serial port: write and read data
I'm able to connect to my serial port, but I need to read data from it all the time.
It's working for about 39 minutes, but after it stops at line serial.flush().
When I stop Qt and start it again it also stops at serial.flush(). I need to restart my modem to let it work again...
I'm not sure I'm executing this properly...
// Open Serial connexion
QSerialPort serial;
serial.setPortName("usbserial-26214A");
serial.open(QIODevice::ReadWrite);
serial.setBaudRate(QSerialPort::Baud115200);
serial.setDataBits(QSerialPort::Data8);
serial.setParity(QSerialPort::NoParity);
serial.setStopBits(QSerialPort::OneStop);
serial.setFlowControl(QSerialPort::HardwareControl);
if (serial.isOpen() && serial.isWritable())
{
qDebug() << "Serial is open";
QByteArray output;
QByteArray input;
while(true)
{
output = "AT+CPMS="SM"r";
serial.write(output);
serial.flush();
serial.waitForBytesWritten(1000);
serial.waitForReadyRead(1000);
input = serial.readAll();
}
}
//EDIT
if deleting flush it's working, but code goes really fast. It don't wait for WaitFor...
After 2nd loop he doesn't has time to read data.
serial.isOpen() && serial.isWritable() always sends true in while loop.
Program stops at flush after 30 minutes!
c++ qt serial-port qtcore qtserialport
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
|
show 5 more comments
I'm able to connect to my serial port, but I need to read data from it all the time.
It's working for about 39 minutes, but after it stops at line serial.flush().
When I stop Qt and start it again it also stops at serial.flush(). I need to restart my modem to let it work again...
I'm not sure I'm executing this properly...
// Open Serial connexion
QSerialPort serial;
serial.setPortName("usbserial-26214A");
serial.open(QIODevice::ReadWrite);
serial.setBaudRate(QSerialPort::Baud115200);
serial.setDataBits(QSerialPort::Data8);
serial.setParity(QSerialPort::NoParity);
serial.setStopBits(QSerialPort::OneStop);
serial.setFlowControl(QSerialPort::HardwareControl);
if (serial.isOpen() && serial.isWritable())
{
qDebug() << "Serial is open";
QByteArray output;
QByteArray input;
while(true)
{
output = "AT+CPMS="SM"r";
serial.write(output);
serial.flush();
serial.waitForBytesWritten(1000);
serial.waitForReadyRead(1000);
input = serial.readAll();
}
}
//EDIT
if deleting flush it's working, but code goes really fast. It don't wait for WaitFor...
After 2nd loop he doesn't has time to read data.
serial.isOpen() && serial.isWritable() always sends true in while loop.
Program stops at flush after 30 minutes!
c++ qt serial-port qtcore qtserialport
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
If waitForBytesWritten() it should be safe to omit the flush(). I guess this won't solve the problem though. Is it possible to just run a soft-reset always before AT+CPMS Sequence? Not sure the connection problem is related to your application.
– Sebastian Lange
Oct 20 '14 at 6:46
If deletingflushline, loop goes really fast and don't seems towaitFor.... How to do a soft-reset?
– gr3g
Oct 20 '14 at 6:54
Does the application continue by simply powercycling the modem ? Or do you also have to restart the App ? In the first case I would assume that the modem got stuck. May be you should debug the state the modem is in and check if there are commands to revitalize it.
– Oncaphillis
Oct 20 '14 at 7:59
By powercycling the modem it works. I also have to restart the app because I can't find errors...serial.isOpen() || serial.isWritable()is true andserial.errorStringis null
– gr3g
Oct 20 '14 at 10:24
Please see edits
– gr3g
Oct 20 '14 at 13:45
|
show 5 more comments
I'm able to connect to my serial port, but I need to read data from it all the time.
It's working for about 39 minutes, but after it stops at line serial.flush().
When I stop Qt and start it again it also stops at serial.flush(). I need to restart my modem to let it work again...
I'm not sure I'm executing this properly...
// Open Serial connexion
QSerialPort serial;
serial.setPortName("usbserial-26214A");
serial.open(QIODevice::ReadWrite);
serial.setBaudRate(QSerialPort::Baud115200);
serial.setDataBits(QSerialPort::Data8);
serial.setParity(QSerialPort::NoParity);
serial.setStopBits(QSerialPort::OneStop);
serial.setFlowControl(QSerialPort::HardwareControl);
if (serial.isOpen() && serial.isWritable())
{
qDebug() << "Serial is open";
QByteArray output;
QByteArray input;
while(true)
{
output = "AT+CPMS="SM"r";
serial.write(output);
serial.flush();
serial.waitForBytesWritten(1000);
serial.waitForReadyRead(1000);
input = serial.readAll();
}
}
//EDIT
if deleting flush it's working, but code goes really fast. It don't wait for WaitFor...
After 2nd loop he doesn't has time to read data.
serial.isOpen() && serial.isWritable() always sends true in while loop.
Program stops at flush after 30 minutes!
c++ qt serial-port qtcore qtserialport
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
I'm able to connect to my serial port, but I need to read data from it all the time.
It's working for about 39 minutes, but after it stops at line serial.flush().
When I stop Qt and start it again it also stops at serial.flush(). I need to restart my modem to let it work again...
I'm not sure I'm executing this properly...
// Open Serial connexion
QSerialPort serial;
serial.setPortName("usbserial-26214A");
serial.open(QIODevice::ReadWrite);
serial.setBaudRate(QSerialPort::Baud115200);
serial.setDataBits(QSerialPort::Data8);
serial.setParity(QSerialPort::NoParity);
serial.setStopBits(QSerialPort::OneStop);
serial.setFlowControl(QSerialPort::HardwareControl);
if (serial.isOpen() && serial.isWritable())
{
qDebug() << "Serial is open";
QByteArray output;
QByteArray input;
while(true)
{
output = "AT+CPMS="SM"r";
serial.write(output);
serial.flush();
serial.waitForBytesWritten(1000);
serial.waitForReadyRead(1000);
input = serial.readAll();
}
}
//EDIT
if deleting flush it's working, but code goes really fast. It don't wait for WaitFor...
After 2nd loop he doesn't has time to read data.
serial.isOpen() && serial.isWritable() always sends true in while loop.
Program stops at flush after 30 minutes!
c++ qt serial-port qtcore qtserialport
c++ qt serial-port qtcore qtserialport
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
edited Oct 20 '14 at 13:53
lpapp
42.1k1376102
42.1k1376102
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
asked Oct 20 '14 at 6:41
gr3ggr3g
1,64121228
1,64121228
If waitForBytesWritten() it should be safe to omit the flush(). I guess this won't solve the problem though. Is it possible to just run a soft-reset always before AT+CPMS Sequence? Not sure the connection problem is related to your application.
– Sebastian Lange
Oct 20 '14 at 6:46
If deletingflushline, loop goes really fast and don't seems towaitFor.... How to do a soft-reset?
– gr3g
Oct 20 '14 at 6:54
Does the application continue by simply powercycling the modem ? Or do you also have to restart the App ? In the first case I would assume that the modem got stuck. May be you should debug the state the modem is in and check if there are commands to revitalize it.
– Oncaphillis
Oct 20 '14 at 7:59
By powercycling the modem it works. I also have to restart the app because I can't find errors...serial.isOpen() || serial.isWritable()is true andserial.errorStringis null
– gr3g
Oct 20 '14 at 10:24
Please see edits
– gr3g
Oct 20 '14 at 13:45
|
show 5 more comments
If waitForBytesWritten() it should be safe to omit the flush(). I guess this won't solve the problem though. Is it possible to just run a soft-reset always before AT+CPMS Sequence? Not sure the connection problem is related to your application.
– Sebastian Lange
Oct 20 '14 at 6:46
If deletingflushline, loop goes really fast and don't seems towaitFor.... How to do a soft-reset?
– gr3g
Oct 20 '14 at 6:54
Does the application continue by simply powercycling the modem ? Or do you also have to restart the App ? In the first case I would assume that the modem got stuck. May be you should debug the state the modem is in and check if there are commands to revitalize it.
– Oncaphillis
Oct 20 '14 at 7:59
By powercycling the modem it works. I also have to restart the app because I can't find errors...serial.isOpen() || serial.isWritable()is true andserial.errorStringis null
– gr3g
Oct 20 '14 at 10:24
Please see edits
– gr3g
Oct 20 '14 at 13:45
If waitForBytesWritten() it should be safe to omit the flush(). I guess this won't solve the problem though. Is it possible to just run a soft-reset always before AT+CPMS Sequence? Not sure the connection problem is related to your application.
– Sebastian Lange
Oct 20 '14 at 6:46
If waitForBytesWritten() it should be safe to omit the flush(). I guess this won't solve the problem though. Is it possible to just run a soft-reset always before AT+CPMS Sequence? Not sure the connection problem is related to your application.
– Sebastian Lange
Oct 20 '14 at 6:46
If deleting
flush line, loop goes really fast and don't seems to waitFor.... How to do a soft-reset?– gr3g
Oct 20 '14 at 6:54
If deleting
flush line, loop goes really fast and don't seems to waitFor.... How to do a soft-reset?– gr3g
Oct 20 '14 at 6:54
Does the application continue by simply powercycling the modem ? Or do you also have to restart the App ? In the first case I would assume that the modem got stuck. May be you should debug the state the modem is in and check if there are commands to revitalize it.
– Oncaphillis
Oct 20 '14 at 7:59
Does the application continue by simply powercycling the modem ? Or do you also have to restart the App ? In the first case I would assume that the modem got stuck. May be you should debug the state the modem is in and check if there are commands to revitalize it.
– Oncaphillis
Oct 20 '14 at 7:59
By powercycling the modem it works. I also have to restart the app because I can't find errors...
serial.isOpen() || serial.isWritable()is true and serial.errorString is null– gr3g
Oct 20 '14 at 10:24
By powercycling the modem it works. I also have to restart the app because I can't find errors...
serial.isOpen() || serial.isWritable()is true and serial.errorString is null– gr3g
Oct 20 '14 at 10:24
Please see edits
– gr3g
Oct 20 '14 at 13:45
Please see edits
– gr3g
Oct 20 '14 at 13:45
|
show 5 more comments
1 Answer
1
active
oldest
votes
If serial.isOpen() && serial.isWritable() is true in while loop, but you can't access it could come from you preferences on your computer.
On OSX: System preferences -> network -> select serial -> advanced -> PPP:
able: Ask to stay connected every 10 minutes,
disable: disconnect at close of session,
disable: disconnect when changing of user
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
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oldest
votes
active
oldest
votes
If serial.isOpen() && serial.isWritable() is true in while loop, but you can't access it could come from you preferences on your computer.
On OSX: System preferences -> network -> select serial -> advanced -> PPP:
able: Ask to stay connected every 10 minutes,
disable: disconnect at close of session,
disable: disconnect when changing of user
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
add a comment |
If serial.isOpen() && serial.isWritable() is true in while loop, but you can't access it could come from you preferences on your computer.
On OSX: System preferences -> network -> select serial -> advanced -> PPP:
able: Ask to stay connected every 10 minutes,
disable: disconnect at close of session,
disable: disconnect when changing of user
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
add a comment |
If serial.isOpen() && serial.isWritable() is true in while loop, but you can't access it could come from you preferences on your computer.
On OSX: System preferences -> network -> select serial -> advanced -> PPP:
able: Ask to stay connected every 10 minutes,
disable: disconnect at close of session,
disable: disconnect when changing of user
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
If serial.isOpen() && serial.isWritable() is true in while loop, but you can't access it could come from you preferences on your computer.
On OSX: System preferences -> network -> select serial -> advanced -> PPP:
able: Ask to stay connected every 10 minutes,
disable: disconnect at close of session,
disable: disconnect when changing of user
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
answered Oct 21 '14 at 11:40
gr3ggr3g
1,64121228
1,64121228
add a comment |
add a comment |
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If waitForBytesWritten() it should be safe to omit the flush(). I guess this won't solve the problem though. Is it possible to just run a soft-reset always before AT+CPMS Sequence? Not sure the connection problem is related to your application.
– Sebastian Lange
Oct 20 '14 at 6:46
If deleting
flushline, loop goes really fast and don't seems towaitFor.... How to do a soft-reset?– gr3g
Oct 20 '14 at 6:54
Does the application continue by simply powercycling the modem ? Or do you also have to restart the App ? In the first case I would assume that the modem got stuck. May be you should debug the state the modem is in and check if there are commands to revitalize it.
– Oncaphillis
Oct 20 '14 at 7:59
By powercycling the modem it works. I also have to restart the app because I can't find errors...
serial.isOpen() || serial.isWritable()is true andserial.errorStringis null– gr3g
Oct 20 '14 at 10:24
Please see edits
– gr3g
Oct 20 '14 at 13:45