Add some documentation about new commands

Author: besser82

README.rst

@@ -152,7 +152,7 @@ Reset the device:
 
     $ evic-usb reset
 
-Dump any part of the flash memory:
+Dump any part of the flash memory (May not work with all firmwares):
 
 ::
 
@@ -164,13 +164,13 @@ Example to read the parameters flash memory:
 
     $ evic-usb fmc-read -o out.bin -s 122880 -l 4096
 
-Setup date and time of the device to the current time:
+Setup date and time of the device to the current time (For firmwares supporting clock display):
 
 ::
 
     $ evic-usb time
 
-Take a screenshot of the device display:
+Take a screenshot of the device display (May not work with all firmwares):
 
 ::
 

evic/cli.py

@@ -327,7 +327,10 @@ def reset():
 
 @usb.command('time')
 def time():
-    """Sets the device date/time to now."""
+    """Sets the device date/time to now.
+    Works only with devices and/or firmwares
+    supporting a clock-screen on the display.
+    """
 
     dev = evic.HIDTransfer()
 

evic/device.py

@@ -179,6 +179,7 @@ def read_dataflash(self):
 
     def fmc_read(self, start, length):
         """Reads the device flash memory.
+        May not work with all devices or firmwares.
 
         Returns:
             An array containing the data flash memory content.
@@ -207,6 +208,7 @@ def hid_command(self, cmd, start, length):
 
     def read_screen(self):
         """Reads the screen memory.
+        May not work with all devices or firmwares.
 
         Returns:
             An array containing the screen.