1 files changed, 22 insertions, 6 deletions
diff --git a/src/serialport/qserialport_unix.cpp b/src/serialport/qserialport_unix.cpp
index afdc640..9979256 100644
--- a/src/serialport/qserialport_unix.cpp
+++ b/src/serialport/qserialport_unix.cpp
@@ -369,10 +369,9 @@ bool QSerialPortPrivate::setBreakEnabled(bool set)
     return true;
 }
 
-void QSerialPortPrivate::startWriting()
+qint64 QSerialPortPrivate::readData(char *data, qint64 maxSize)
 {
-    if (!isWriteNotificationEnabled())
-        setWriteNotificationEnabled(true);
+    return readBuffer.read(data, maxSize);
 }
 
 bool QSerialPortPrivate::waitForReadyRead(int msecs)
@@ -496,9 +495,6 @@ QSerialPortPrivate::setCustomBaudRate(qint32 baudRate, QSerialPort::Directions d
     if (::ioctl(descriptor, TIOCGSERIAL, &currentSerialInfo) == -1)
         return decodeSystemError();
 
-    if (currentSerialInfo.baud_base % baudRate != 0)
-        return QSerialPort::UnsupportedOperationError;
-
     currentSerialInfo.flags &= ~ASYNC_SPD_MASK;
     currentSerialInfo.flags |= (ASYNC_SPD_CUST /* | ASYNC_LOW_LATENCY*/);
     currentSerialInfo.custom_divisor = currentSerialInfo.baud_base / baudRate;
@@ -506,6 +502,13 @@ QSerialPortPrivate::setCustomBaudRate(qint32 baudRate, QSerialPort::Directions d
     if (currentSerialInfo.custom_divisor == 0)
         return QSerialPort::UnsupportedOperationError;
 
+    if (currentSerialInfo.custom_divisor * baudRate != currentSerialInfo.baud_base) {
+        qWarning("Baud rate of serial port %s is set to %d instead of %d: divisor %f unsupported",
+            qPrintable(systemLocation),
+            currentSerialInfo.baud_base / currentSerialInfo.custom_divisor,
+            baudRate, (float)currentSerialInfo.baud_base / baudRate);
+    }
+
     if (::ioctl(descriptor, TIOCSSERIAL, &currentSerialInfo) == -1)
         return decodeSystemError();
 
@@ -868,6 +871,19 @@ inline bool QSerialPortPrivate::initialize(QIODevice::OpenMode mode)
     return true;
 }
 
+qint64 QSerialPortPrivate::bytesToWrite() const
+{
+    return writeBuffer.size();
+}
+
+qint64 QSerialPortPrivate::writeData(const char *data, qint64 maxSize)
+{
+    ::memcpy(writeBuffer.reserve(maxSize), data, maxSize);
+    if (!writeBuffer.isEmpty() && !isWriteNotificationEnabled())
+        setWriteNotificationEnabled(true);
+    return maxSize;
+}
+
 bool QSerialPortPrivate::updateTermios()
 {
     Q_Q(QSerialPort);