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Set up Qt for Maemo Environment

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Created: seppo_fn (26 Jan 2011)
Last edited: hamishwillee (24 Jul 2012)


Setting Up Development Environment for Maemo

Maemo is a software platform developed by Nokia for smartphones and Internet Tablets. The Maemo SDK provides an open development environment for different applications on top of the Maemo platform. The necessary tools from the Maemo SDK are also included in the Qt SDK. The whole tool chain that you need to create, build, debug, run, and deploy Maemo applictions is installed and configured when you install the Qt SDK.

For more information about developing applications for the Maemo 5 platform, select Help > Index and look for Platform Notes, or see Platform Notes - Maemo 5.

Hardware and Software Requirements

To build and run Qt applications for Maemo, you need the following:

-Nokia N900 device with software update release 1.2 (V10.2010.19-1) or later installed.
-Nokia USB drivers.
The USB drivers are only needed if you develop on Windows and if you use a USB connection to run applications on the device. The drivers are installed as part of the Qt SDK. You can also download them from PC Connectivity on the Maemo web site. Download and install the latest PC_Connectivity_<version>.exe (at the time of writing, PC_Connectivity_0.9.4.exe).
Note: The only supported build system for Maemo in Qt Creator is qmake.

Setting Up the Nokia N900

You can connect your device to your development PC using either a USB or WLAN connection.
For the device, you need to use a tool called Mad Developer to create the device-side end point for USB and WLAN connections. It provides no diagnostics functions but is essential for creating connections between the device and your development PC.
To use a WLAN connection, you must activate WLAN on the device and connect it to the same WLAN as the development PC. The network address is displayed in the Mad Developer.
To use an USB connection, you need to set up the Nokia N900 as a network device on the development PC.
Note: If you plan to connect your development PC to the Nokia N900 only over WLAN, you can ignore the USB-specific parts in the following sections.

Installing and Configuring Mad Developer

Install Mad Developer on a device and configure a connection between the development PC and the device.
Note: The following instructions describe Mad Developer 2.1. The process and text labels might differ on other Mad Developer versions.

To install and configure Mad Developer:
1. On the Nokia N900, select App Manager > Download > Development > mad-developer to install the Mad Developer software package.
2. Click Mad Developer to start the Mad Developer application.
3. To use a WLAN connection, activate WLAN on the device and connect to the same network as the development PC. You can see the network address in the wlan0 field.
4. To use an USB connection:
-If you are using Microsoft Windows as development host, you must change the driver loaded for instantiating the connection. In the Mad Developer, select Manage USB and select Load g_ether.
-To set up the USB settings, click Edit on the usb0 row and confirm by clicking Configure.
Note: By default, you do not need to make changes. The usb0 row displays the IP address
5. Select Developer Password to generate a password for a freshly created user called developer. The password stays valid for as long as the password generation dialog is open. You enter the password when you configure the connection in Qt Creator.

Installing Qt Mobility APIs

To develop applications that use the Qt Mobility APIs, you must install the APIs on the devices. The APIs are not available in the Nokia N900 package manager, and therefore, you must install them from the command line as the root user. To become the root user you must first install rootsh from the application manager.
1. On the device, install rootsh from the Application Manager.
2. In Programs, select X Terminal to open a terminal window.
3. To switch to the root user, enter the following command: sudo gainroot
4. To install Qt Mobility libraries, enter the following command: apt-get install libqtm-*
5. To confirm the installation, enter: Y
6. Close the terminal.

Setting Up Network Connectivity on Development PC

Use the network configuration tools on your platform to specify the connection to the device on the development PC. You need to do this only if you use an USB connection.

The device uses the IP address with the subnet for its USB connection by default, so you can create the network interface with a different address inside the same subnet too.
Note: If you have changed the IP address of the device when configuring Mad Developer, you need to reflect those changes in your development PC USB network settings.
Run the following command in a shell as root user: ifconfig usb0 up

When you connect the device to your Windows PC, Windows tries to install a driver for the Linux USB Ethernet connection. In the Found New Hardware Wizard, select No, not this time in the first dialog and Install the software automatically in the second dialog.
To specify a network connection:
1. Open the Network Connections window.
2. Select the Linux USB Ethernet connection that is displayed as a new Local Area Connection.
3. Edit the Internet Protocol Version 4 (TCP/IPv4) properties to specify the IP address for the connection. In the Use the following IP address field, enter the following values:

IP Address:
Default gateway: leave this field empty

Depending on your version of Microsoft Windows you may have to unplug and re-plug the Nokia N900 to reload the driver with its configuration accordingly.

Configuring Connections in Qt Creator

To be able to run and debug applications on the Maemo emulator and devices, you must set up a connection to the emulator and the device in the Qt Creator build and run settings. You can protect the connections between Qt Creator and the Maemo emulator or a device by using either a password or an SSH key. You must always use a password for the initial connection, but can then deploy an SSH key and use it for subsequent connections. If you use a password, you must generate it in Mad Developer and enter it in Qt Creator every time you connect to the Maemo emulator or to a device.
If you do not have an SSH key, you can create it in Qt Creator. Encrypted keys are not supported. For more information, see the Qt Creator Manual. The Qt SDK installation program configured a default connection to the Maemo emulator. You only need to specify the password and deploy the SSH key.
1. To specify authentication for the connection to the Maemo emulator:
- Start Mad Developer in the emulator.
- Click Developer Password to generate a password for the connection.
- In Qt Creator, select Tools > Options... > Projects > Maemo Device Configurations > Maemo emulator to specify the password.
Maemo emulator configuration.png
- In the Authentication type field, select Password for the initial connection.
- In the Password field, enter the password from the Mad Developer for the initial connection.
- You can use the default values for the other fields.
- Click Test to test the connection.

To avoid having to specify the password every time you connect to the Maemo emulator, click Deploy Key... and select the file that contains your public key.
- When you have deployed the key to the device, change the configuration to use the SSH key for protection.
The default location of the private key file is displayed in the Private key file field.

2. To deploy applications and run them remotely, specify parameters for accessing devices:
- Connect your device to the development PC via an USB cable or a WLAN. For an USB connection, you are prompted to select the mode to use. Choose PC suite mode.
Note: If you experience connection problems due to a USB port issue, switch to a different port or use WLAN to connect to the device.
- Select Tools > Options... > Projects > Maemo Device Configurations > Add, and add a new configuration for a Remote device.
Nokia N900 configuration.png
- In the Host name field, enter the IP address from the usb0 or wlan0 field in Mad Developer.
- Specify the other settings in the same way as for a Maemo emulator connection.
- Click Test to test the connection.
- Click OK to close the dialog.

3. To specify build and run settings:
- Open a project for an application you want to develop for your Nokia N900.
- Click Projects to open the projects mode.
- In the Build Settings section, choose the MADDE Qt version that was registered by the installation program.
Maemo build settings.png
- In the Run Settings section, click Add to add a new run configuration.
- Set a name and select the device configuration.
Maemo run settings.png

Note: You can either add separate run settings for both the Maemo emulator connection and the device connection or select the Device configuration before you run the application.
- Click the Run button to build and run the application.


The addresses used in this example might be reserved by some other application in your network. If you cannot establish a connection, try the following optional configurations:

Optional Mad configurations.png
Note: You cannot use the value localhost for connections to a device.
Note: VPN connections might block the device connection.

Related tutorials

This tutorial is part of the article Getting Started with Qt Quick and the Qt SDK v1.1.

This page was last modified on 24 July 2012, at 02:10.
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