From 294e708268f79d1ac85936e95d4176dc98a5a77e Mon Sep 17 00:00:00 2001
From: alanbjohnston <alan.b.johnston@gmail.com>
Date: Fri, 11 Sep 2020 16:15:24 -0400
Subject: [PATCH] added try test to make sure i2c bus is enabled

---
 python/voltcurrent.py | 53 +++++++++++++++++++++++--------------------
 1 file changed, 28 insertions(+), 25 deletions(-)

diff --git a/python/voltcurrent.py b/python/voltcurrent.py
index 51d4444e..70a19fe7 100644
--- a/python/voltcurrent.py
+++ b/python/voltcurrent.py
@@ -27,37 +27,40 @@ if __name__ == "__main__":
   addresses = [0x40, 0x41, 0x44, 0x45] #INA219 addresses on the bus
 #  print("buses: ", buses, " addr: ", addresses)
   for x in buses:
-    i2c_bus = I2C(x) # Device is /dev/i2c-x
-    for y in addresses:
+    try:
+      i2c_bus = I2C(x) # Device is /dev/i2c-x
+      for y in addresses:
  #     print(x,y)
-      try:
+        try:
   # Create library object using  Extended Bus I2C port
-#        print("bus: ", x, " addr: ", y)
-        if x == 0 and y == 0x45:
-#          print("Reading INA219 in MoPower Board")
-          i2c_bus = I2C(1)
-          ina219 = INA219(i2c_bus, 0x4a)
-        else:
-          ina219 = INA219(i2c_bus, y)
+#         print("bus: ", x, " addr: ", y)
+          if x == 0 and y == 0x45:
+#           print("Reading INA219 in MoPower Board")
+            i2c_bus = I2C(1)
+            ina219 = INA219(i2c_bus, 0x4a)
+          else:
+            ina219 = INA219(i2c_bus, y)
    
-#   print("ina219 test")
-        if config:
-#          print("Configuring")
+#       print("ina219 test")
+          if config:
+#           print("Configuring")
 # optional : change configuration to use 32 samples averaging for both bus voltage and shunt voltage
-          ina219.bus_adc_resolution = ADCResolution.ADCRES_12BIT_32S   # 1S
-          ina219.shunt_adc_resolution = ADCResolution.ADCRES_12BIT_32S     # 1S
+            ina219.bus_adc_resolution = ADCResolution.ADCRES_12BIT_32S   # 1S
+            ina219.shunt_adc_resolution = ADCResolution.ADCRES_12BIT_32S     # 1S
 # optional : change voltage range to 16V
-          ina219.bus_voltage_range = BusVoltageRange.RANGE_16V
+            ina219.bus_voltage_range = BusVoltageRange.RANGE_16V
 
-        bus_voltage = ina219.bus_voltage  # voltage on V- (load side)
-#       shunt_voltage = ina219.shunt_voltage  # voltage between V+ and V- across the shunt
-        current = ina219.current  # current in mA
-        if x == 0 and y == 0x45:
-          current = current * 10
+          bus_voltage = ina219.bus_voltage  # voltage on V- (load side)
+#         shunt_voltage = ina219.shunt_voltage  # voltage between V+ and V- across the shunt
+          current = ina219.current  # current in mA
+          if x == 0 and y == 0x45:
+            current = current * 10
 # INA219 measure bus voltage on the load side. So PSU voltage = bus_voltage + shunt_voltage
-#       print("{:6.3f}".format(bus_voltage + shunt_voltage))
-        print("{:6.3f} ".format(bus_voltage), "{:6.3f} ".format(current) , end = '')
-      except:
-        print("{:6.3f} ".format(0),  "{:6.3f} ".format(0), end = '')
+#         print("{:6.3f}".format(bus_voltage + shunt_voltage))
+          print("{:6.3f} ".format(bus_voltage), "{:6.3f} ".format(current) , end = '')    
+        except:
+          print("{:6.3f} ".format(0),  "{:6.3f} ".format(0), end = '')
+    except:
+      print("{:6.3f} ".format(0),  "{:6.3f} ".format(0), end = '')   
 #        pass
   print(" ")