Freescale CodeWarrior USB TAP disassembled 

Let's get started with two pictures of the Freescale Codewarrior USB-TAP's PCB:




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Buildroot error - fakeroot: preload library not found, aborting. 

Never ever move your buildroot directory because it does not like it.
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A few things what I setup when I create a new Qt Widget project 

1.Add the folowing to pro file:


OBJECTS_DIR = build
MOC_DIR = build
UI_DIR = build
RCC_DIR=build

DESTDIR = bin

and the binaries won't mess up your sorce code directory

2. Make the following modifications in the main.cpp:


#include <QtGui/QApplication>
#include <QtCore/QTextCodec>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8";));
QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8";));

QCoreApplication::setOrganizationName("MM";);
QCoreApplication::setApplicationName("Mikrotik data miner";);
QCoreApplication::setApplicationVersion("0.1";);

QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}


Why?
The QTextCodec trick is neccessary because the sourcecode is UTF-8 encoded, and if I want to put a string from the code to somewhere I would need to use QString::fromUtf8(). If you do not believe check a generated ui_*.h file.

Always give set the name to your application and the application domain. This is useful when you are using QSettings, you do not need to give constructor arguments when creating a settings object. The settings object constructed in this way always use a separate data area specified by the platform. (.config/QCodeApplication::applicationDomain/QCoreApplication:applicationName.ini on Linux and registry on Windows)


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I/O error while opening /de/ttyS0 on Dell D630 

I have recently tried to breathe life to the serial port of my DELL D630 notebook under Ubuntu Natty, but the opening always failed with I/O error.

I have tried the relevant acpi=off, pnpacpi=off kernel parameters, updated the BIOS, but these thigns did not lead to succes. As final trying I have switched the port from COM1 to COM2 int the BIOS and finally it became available as /dev/ttyS1


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Lattice ispVM under Ubuntu 11.04 with USB download cable 

I have tried to use the Lattice ispVM under Ubuntu 11.04, with the Lattice USB download cable, but I have to run it as root, even after adding the udev rules mentioned in the FAQ.

After some strace analyzing I have figured out that it is trying to open the /dev/bus/usb/{roothub}/{devide} nodes. Since then the download cable's node was read only it failed.

I have written the following udev rule to the /etc/udev/rules.d/51-lattice.rules file inspired by my AVR doper's rule:


SUBSYSTEM=="usb", ACTION=="add", ATTR{idVendor}=="1134", ATTR{idProduct}=="8001", MODE="0666"

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