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
To set up Energy Probe, follow these steps:
Connect your target to your host through a USB port.
If necessary, install drivers using the standard Windows driver
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.
If prompted to locate the driver file, select the
ARM_EnergyProbe.inf configuration file, located in
To setup on Linux Ubuntu, enter the following command: sudo apt-get
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
- Add yourself to the same group as the tty device. To do so, enter the
following command: usermod -a -G Group_Name
dialout is the usual name of the group for the
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.
NoteIn 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.
If your target has headers available for power or energy metering, attach the
ground wire, then attach the probes.
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-.