12.4 Setting up Energy Probe

It is critical that you set up your Energy Probe correctly. Failure to do so can result in missing power data in Streamline, and, in some cases, damage to your target.

Figure 12-3 Connection to target

Connection to target

To set up Energy Probe, follow these steps:

Procedure

  1. Connect your target to your host through a USB port.
  2. If necessary, install drivers using the standard Windows driver installation. When first plugging in the Energy Probe on Windows, the LED flashes RED at approximately one second intervals. This indicates the USB enumeration has failed and that you must install the driver.
  3. If prompted to locate the driver file, select the ARM_EnergyProbe.inf configuration file, located in install_directory/sw/energy probe/
  4. To setup on Linux Ubuntu, enter the following command: sudo apt-get install libudev-dev
  5. On Linux Ubuntu, you must either change the permissions of the tty device or add yourself to the dialout group for Energy Probe to successfully use the device. To change the permissions of the tty device, either:
    • Use the following command: chmod 777 tty_location
    • Add yourself to the same group as the tty device. To do so, enter the following command: usermod -a -G Group_Name User_Name
    dialout is the usual name of the group for the tty device. When you have installed the driver and it is operating correctly, the LED remains green. Attaching a probe backwards to Energy Probe or the target causes the LED to turn red. Backwards connections do not damage your target or Energy Probe but this kind of connection does not provide useful data. Disconnect all Energy Probe probes and wait until the LED changes to green, then reattach one by one and make sure to reverse the polarity on any probe that results in the LED changing to red. When you have attached the Energy Probe correctly, the LED remains green.

    Note

    In case of low consumption, it is possible that the LED remains red even if the connection is right. This might happen if the target device is idle.
  6. If your target has headers available for power or energy metering, attach the ground wire, then attach the probes.
  7. Attach the probes. Make sure the probe polarity is correct by observing if the LED changes from green to red. The probe white wire is V+. The black wire is V-.
Related concepts
Energy Probe overview
Energy Probe data in Streamline
Related tasks
Adding the caiman application to Streamline
Updating your firmware
Related reference
Energy Probe requirements
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