Structure

XDK Devices

The XDK devices list shows a list of all XDKs that got connected during the current session in the XDK Workbench. The three buttons on the right allow to flash, boot or to debug the device. For activating the debug mode the JLink adapter (sold separately here) must be connected. Right clicking on the XDK will open the context menu. You can choose “Go to Bootloader” and “Flash Bootloader”.

The COM and JLink buttons in the device list can also be manually activated or deactivated. The COM button enables the current connection between the XDK and the PC. The JLink button enables the current connection over the JLink of the XDK to the PC. What a JLink is and does will be explained later in this chapter.

Flash Button

Select a project from the Project Explorer or import an example from the XDK welcome screen. Press the Flash button. The XDK Workbench then compiles the project.The XDK is then put into bootloader mode. The compiled project is now transferred to the XDK, which boots automatically on completion.

Boot Reboot

The button is context-sensitive and can change between Boot and Reboot, depending on the current mode of the XDK. By pressing the Boot button the XDK boots from bootloader to application mode. By pressing the Reboot button XDK switches from application mode to bootloader mode.

Bootloader Mode

The XDK bootloader is stored in the first 64 kB of XDKs flash memory. When the bootloader is no longer present or becomes corrupted, an update or recovery is only possible via the JLink JTAG Adapter. The bootloader allows uploading XDK applications via USB (see XDK Bootloader in the XDK General for further information).

XDK can be set into bootloader with a useful feature of the XDK workbench. Right-click on the XDK and select Go to Bootloader. In the case that the XDK does not respond (and is possibly not even recognized over USB), you can manually force the XDK into boatloader mode via Approach 1

Approach 1

• Switch off XDK

• Press and hold Button 1

• Turn on XDK

• Release Button 1 as soon as red LED turns on

This approach is the “last resort” for when the XDK does not respond after turning it on. Even if the XDK is not recognized over USB, approach 1 will work. There are two more ways to set the XDK into bootloader mode.

Approach 2

• Get XDK into application mode (typically by turning it on)

• Connect it to your PC

• Start XDK Workbench

• Right-click on your XDK in the DK Device View and select

  Go to Bootloader

The second approach will set a flag in the user page of the MCU of XDK. When the XDK reboots, the bootloader reads the flag and engages itself. Only after booting an application, the flag is reset.

Approach 3

• Get XDK into application mode (typically by turning it on)

• Connect it to your PC

• Connect to XDK with a serial terminal program (see XDK_USB_DEVICE_HANDLING_Terminal)

• Send the following string: #reBoot$

• XDK will automatically reboot and go into the bootloader