add --histogram option

1 files changed, 11 insertions, 1 deletions

diff --git a/bin/msp430-etv b/bin/msp430-etv
index d51bacc..5356f01 100755
--- a/bin/msp430-etv
+++ b/bin/msp430-etv
@@ -106,6 +106,10 @@ OPTIONS
     Draw power/time plot
   --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.
 
 DEPENDENCIES
 
@@ -141,7 +145,7 @@ def peak_search2(data, lower, upper, check_function):
 
 if __name__ == '__main__':
     try:
-        optspec = ('help load= save= skip= threshold= threshold-peakcount= plot stat')
+        optspec = ('help load= save= skip= threshold= threshold-peakcount= plot stat histogram=')
         raw_opts, args = getopt.getopt(sys.argv[1:], "", optspec.split(' '))
 
         for option, parameter in raw_opts:
@@ -309,4 +313,10 @@ if __name__ == '__main__':
         plt.xlabel('Time [s]')
         plt.ylabel('Power [W]')
         plt.grid(True)
+        if 'load' in opt:
+            plt.title(opt['load'])
+        plt.show()
+
+    if 'histogram' in opt:
+        plt.hist((data[1:, 3] - data[:-1, 3]) * 1e-9, bins=int(opt['histogram']))
         plt.show()