Refactor the speed configuration for *nix

The internal implementation of this is a little tangled. It is
reasonable to simplify it:

1. Remove the setBaudRate_helper() method, as it is equivalent to
   setStandardBaudRate() method.

2. Now the setStandardBaudRate() and the setCustomBaudRate() are
   self-sufficient methods (can setup a speed and an error codes
   internally) and return a boolean values.

Also added the "loopback" test for check of different speeds.

Tested with the on-board and the USB serial ports.

Change-Id: I4320c2e29ad42a394e07753cbaea804d0faf6b78
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/src/serialport/qserialport_p.h b/src/serialport/qserialport_p.h
index 070a316..cf8cb79 100644
--- a/src/serialport/qserialport_p.h
+++ b/src/serialport/qserialport_p.h
@@ -249,12 +249,8 @@ public:
     bool initialize(QIODevice::OpenMode mode);
     bool updateTermios();
 
-    QSerialPortErrorInfo setBaudRate_helper(qint32 baudRate,
-            QSerialPort::Directions directions);
-    QSerialPortErrorInfo setCustomBaudRate(qint32 baudRate,
-            QSerialPort::Directions directions);
-    QSerialPortErrorInfo setStandardBaudRate(qint32 baudRate,
-            QSerialPort::Directions directions);
+    bool setCustomBaudRate(qint32 baudRate, QSerialPort::Directions directions);
+    bool setStandardBaudRate(qint32 baudRate, QSerialPort::Directions directions);
 
     bool isReadNotificationEnabled() const;
     void setReadNotificationEnabled(bool enable);