Error management in C++ on linux for devices
- From: jduran <jdurancomas@xxxxxxxxx>
- Date: Thu, 11 Jun 2009 16:33:16 -0700 (PDT)
Hello all,
I'm software developer. I'm new on embedded devices and in c++. I've a
troble about how to mange error while openning device driver and
configuring the devices (hw) for the first time.
That is, in microcontrolers, it's assumed that I/O is done using
processor registers, so it's assumed that allways are available, for
example to access to a serial port to communicate throw LinBus. If at
initialization any error is detected, a value is returned, but nothing
is destroied.
In contrast, in linux, to access to a serial port, a device file must
be opened (ex /dev/ttyS1), but if no serial port is available, then an
error is returned. But if we develop in C++, and if no port is
present, an exception is thrown, and the object in construction is
destroyed. But the questions are:
- The sensor should open the bus on its constructor? If I want to
reconnect to the bus, I need to recreate the sensor object, and the
bus?
- It's prefereable to use a initialize function member in the driver
to open the bus and configure the sensor? I can communicate with the
device without initial configuration.
- So If i can open the bus, but I can't initialize the device in
device driver constructor, then the device driver is destroied by the
exception.
How do you manage the creation of a device driver and device
initialization?
Thanks in advance.
Joaquim Duran
.
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