--histogram: Add duration and power plots

1 files changed, 21 insertions, 4 deletions

diff --git a/bin/msp430-etv b/bin/msp430-etv
index 624f91f..1f9ecea 100755
--- a/bin/msp430-etv
+++ b/bin/msp430-etv
@@ -117,9 +117,12 @@ OPTIONS
   --stat
     Print mean voltage, current, and power as well as total energy consumption.
   --histogram=<n>
-    Draw histogram of reported energy values per measurement interval
-    (i.e., the differences between each pair of consecutive total energy readings)
-    using <n> buckets.
+    Draw histograms of reported energy values per measurement interval
+    (i.e., the differences between each pair of consecutive total energy readings),
+    measurement interval duration, and
+    mean power values per measurement interval
+    (calculated from energy difference and duration).
+    Each histogram uses <n> buckets.
 
 DEPENDENCIES
 
@@ -385,5 +388,19 @@ if __name__ == "__main__":
         plt.show()
 
     if "histogram" in opt:
-        plt.hist((data[1:, 3] - data[:-1, 3]) * 1e-9, bins=int(opt["histogram"]))
+        bin_count = int(opt["histogram"])
+
+        plt.xlabel("Reported Energy per Measurement Interval [J]")
+        plt.ylabel("Count")
+        plt.hist((data[1:, 3] - data[:-1, 3]) * 1e-9, bins=bin_count)
+        plt.show()
+
+        plt.xlabel("Measurement Interval Duration [s]")
+        plt.ylabel("Count")
+        plt.hist((data[1:, 0] - data[:-1, 0]) * 1e-6, bins=bin_count)
+        plt.show()
+
+        plt.xlabel("Mean Power per Measurement Interval [W]")
+        plt.ylabel("Count")
+        plt.hist(power_from_energy, bins=bin_count)
         plt.show()