3.2.9 Mass Storage Example

Todo:
  • Program the Mass Storage Class example into the target device using Start Without Debugging (Ctrl+Alt+F5)
  • Stop Data Visualizer after capturing a plot

With some scrolling and scaling the plots should look something like this:

The red graph is channel B, and represents the current drawn by the entire board. It appears to toggle between two modes at about 1-second intervals. This is the LED toggling ON and OFF.

The blue graph is the A channel, and represents the current drawn by the target MCU only. It appears to draw about 4.5 mA continuously, with pulses of up to 10 mA, also at 1-second intervals.

Tip: Of interest: disabling the USB ‘disk’ in the Windows device manager will stop this pulse from occurring, indicating that this is probably triggered by an event from Windows.
Todo: Open the Windows explorer and perform a format of the Mass Storage Device.
CAUTION: Take care to format the right disk!

On the plot you should now see periods of much higher current consumption on both board and MCU channels, as shown here: