power monitoring script

selfdrive/hardware/tici/power_monitor.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+import os
+import sys
+import time
+
+def average(avg, sample):
+  # Weighted avg between existing value and new sample
+  return ((avg[0] * avg[1] + sample) / (avg[1] + 1), avg[1] + 1)
+
+
+if __name__ == '__main__':
+
+  sample_time = None
+  if len(sys.argv) > 1:
+    sample_time = int(sys.argv[1])
+
+  start_time = time.monotonic()
+  try:
+    voltage_average = (0., 0)  # average, count
+    current_average = (0., 0)
+    power_average = (0., 0)
+    while sample_time is None or time.monotonic() - start_time < sample_time:
+      with open("/sys/bus/i2c/devices/0-0040/hwmon/hwmon1/in1_input") as f:
+        voltage = int(f.read()) / 1000.
+
+      with open("/sys/bus/i2c/devices/0-0040/hwmon/hwmon1/curr1_input") as f:
+        current = int(f.read())
+
+      power = voltage*current
+
+      # compute averages
+      voltage_average = average(voltage_average, voltage)
+      current_average = average(current_average, current)
+      power_average = average(power_average, power)
+
+      print("%.2f volts %12.2f ma %12.2f mW" % (voltage, current, power))
+      time.sleep(0.25)
+  finally:
+    stop_time = time.monotonic()
+    print("\n----------------------Average-----------------------------------")
+    voltage = voltage_average[0]
+    current = current_average[0]
+    power = power_average[0]
+    print("%.2f volts %12.2f ma %12.2f mW" % (voltage, current, power))
+    print("  {:.2f} Seconds     {} samples".format(stop_time - start_time, voltage_average[1]))
+    print("----------------------------------------------------------------")