QSerialPort bytesAvailable() and read() delayed, QextSerialPort works

[mr_wallyit]

Sorry I have deleted a duplicate message

[mr_wallyit]

Sorry I have deleted a duplicate message

[KeepGoing]

Hello Mr_Wallyit
Thank you for your reply.
My target is android. Is it the same with Android as well?

Thank you in advance.

[KeepGoing]

Hello Mr_Wallyit
Thank you for your reply.
My target is android. Is it the same with Android as well?

Thank you in advance.

[mr_wallyit]

Hello,

yes of course, I use Point of sale Industrial with Android, with workarround we can use serial port.

Best Regards

[mr_wallyit]

Hello,

yes of course, I use Point of sale Industrial with Android, with workarround we can use serial port.

Best Regards

[Abin]

Hi Mr_Wallyit,

Thanks for sharing the details.

I have an android device which has serial port attached to it. The manufacturer has a sample application with it which uses the serial port. The port name is "/dev/ttyS6".

As you mentioned I tried to create folder in my device. My device file explorer shows files structure as "/mnt/sdcard". So I created folders as below:
"/mnt/sdcard/data/lock"
"/mnt/sdcard/data/locks"
"/mnt/sdcard/data/spool/locks"
"/mnt/sdcard/data/spool/uucp"
"/mnt/sdcard/data/tmp"

But, the folder "/mnt/data/local/tmp" is unable to create as my file explorer doesn't allow to create folder.

I kept my code as @QString serialPortLockFilePath(const QString &portName)
{
static const QStringList lockDirectoryPaths = QStringList()

#ifdef Q_OS_ANDROID
<< QStringLiteral("/mnt/sdcard/data/lock")
<< QStringLiteral("/mnt/sdcard/data/locks")
<< QStringLiteral("/mnt/sdcard/data/spool/locks")
<< QStringLiteral("/mnt/sdcard/data/spool/uucp")
<< QStringLiteral("/mnt/sdcard/data/tmp");
#else
<< QStringLiteral("/var/lock")
<< QStringLiteral("/etc/locks")
<< QStringLiteral("/var/spool/locks")
<< QStringLiteral("/var/spool/uucp")
<< QStringLiteral("/tmp");
#endif@

And I have a second device whose files structure as "/sdcard". So I created folders as below:
"/sdcard/data/lock"
"/sdcard/data/locks"
"/sdcard/data/spool/locks"
"/sdcard/data/spool/uucp"
"/sdcard/data/tmp"

But, the folder "/data/local/tmp" is unable to create as my file explorer crashes on creating folder "/data/locaal" (need to retry with different file explorer application).

@QString serialPortLockFilePath(const QString &portName)
{
static const QStringList lockDirectoryPaths = QStringList()

#ifdef Q_OS_ANDROID
<< QStringLiteral("/sdcard/data/lock")
<< QStringLiteral("/sdcard/data/locks")
<< QStringLiteral("/sdcard/data/spool/locks")
<< QStringLiteral("/sdcard/data/spool/uucp")
<< QStringLiteral("/sdcard/data/tmp");
#else
<< QStringLiteral("/var/lock")
<< QStringLiteral("/etc/locks")
<< QStringLiteral("/var/spool/locks")
<< QStringLiteral("/var/spool/uucp")
<< QStringLiteral("/tmp");
#endif@

and created a sample application which tries to access the serial port. I set the port name as @setPortName("/dev/ttyS6");@
But when running the application I get the error "Permission denied".

Could you help me to figure out where I am going wrong.

Thanks in advance.

[Abin]

Hi Mr_Wallyit,

Thanks for sharing the details.

I have an android device which has serial port attached to it. The manufacturer has a sample application with it which uses the serial port. The port name is "/dev/ttyS6".

As you mentioned I tried to create folder in my device. My device file explorer shows files structure as "/mnt/sdcard". So I created folders as below:
"/mnt/sdcard/data/lock"
"/mnt/sdcard/data/locks"
"/mnt/sdcard/data/spool/locks"
"/mnt/sdcard/data/spool/uucp"
"/mnt/sdcard/data/tmp"

But, the folder "/mnt/data/local/tmp" is unable to create as my file explorer doesn't allow to create folder.

I kept my code as @QString serialPortLockFilePath(const QString &portName)
{
static const QStringList lockDirectoryPaths = QStringList()

#ifdef Q_OS_ANDROID
<< QStringLiteral("/mnt/sdcard/data/lock")
<< QStringLiteral("/mnt/sdcard/data/locks")
<< QStringLiteral("/mnt/sdcard/data/spool/locks")
<< QStringLiteral("/mnt/sdcard/data/spool/uucp")
<< QStringLiteral("/mnt/sdcard/data/tmp");
#else
<< QStringLiteral("/var/lock")
<< QStringLiteral("/etc/locks")
<< QStringLiteral("/var/spool/locks")
<< QStringLiteral("/var/spool/uucp")
<< QStringLiteral("/tmp");
#endif@

And I have a second device whose files structure as "/sdcard". So I created folders as below:
"/sdcard/data/lock"
"/sdcard/data/locks"
"/sdcard/data/spool/locks"
"/sdcard/data/spool/uucp"
"/sdcard/data/tmp"

But, the folder "/data/local/tmp" is unable to create as my file explorer crashes on creating folder "/data/locaal" (need to retry with different file explorer application).

@QString serialPortLockFilePath(const QString &portName)
{
static const QStringList lockDirectoryPaths = QStringList()

#ifdef Q_OS_ANDROID
<< QStringLiteral("/sdcard/data/lock")
<< QStringLiteral("/sdcard/data/locks")
<< QStringLiteral("/sdcard/data/spool/locks")
<< QStringLiteral("/sdcard/data/spool/uucp")
<< QStringLiteral("/sdcard/data/tmp");
#else
<< QStringLiteral("/var/lock")
<< QStringLiteral("/etc/locks")
<< QStringLiteral("/var/spool/locks")
<< QStringLiteral("/var/spool/uucp")
<< QStringLiteral("/tmp");
#endif@

and created a sample application which tries to access the serial port. I set the port name as @setPortName("/dev/ttyS6");@
But when running the application I get the error "Permission denied".

Could you help me to figure out where I am going wrong.

Thanks in advance.

[mr_wallyit]

Hello,

this is my source code, I think who is wrong “/mnt/sdcard/data/lock”.

@

bool s = true;
QStringList pathList;

#ifdef ANDROID
pathList << "/sdcard/data";
pathList << "/sdcard/data/lock";
pathList << "/sdcard/data/locks";
pathList << "/sdcard/data/spool";
pathList << "/sdcard/data/spool/locks";
pathList << "/sdcard/data/spool/uucp";
pathList << "/sdcard/data/tmp";
pathList << "/sdcard/data/local";
pathList << "/sdcard/data/local/tmp";
#endif

QDir d;
foreach (const QString s, pathList) {
    d.setPath(s);
    if (!d.exists()){
        if(d.mkpath(d.absolutePath()))
            qCCritical() << "error create directory " << d.absolutePath();
    }
}

@

[mr_wallyit]

Hello,

this is my source code, I think who is wrong “/mnt/sdcard/data/lock”.

@

bool s = true;
QStringList pathList;

#ifdef ANDROID
pathList << "/sdcard/data";
pathList << "/sdcard/data/lock";
pathList << "/sdcard/data/locks";
pathList << "/sdcard/data/spool";
pathList << "/sdcard/data/spool/locks";
pathList << "/sdcard/data/spool/uucp";
pathList << "/sdcard/data/tmp";
pathList << "/sdcard/data/local";
pathList << "/sdcard/data/local/tmp";
#endif

QDir d;
foreach (const QString s, pathList) {
    d.setPath(s);
    if (!d.exists()){
        if(d.mkpath(d.absolutePath()))
            qCCritical() << "error create directory " << d.absolutePath();
    }
}

@