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Interpret first byte as length if command doesn't match expected #6

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Interpret first byte as length if command doesn't match expected #6

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13 changes: 8 additions & 5 deletions ugsimple/GPIB.py
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Original file line number Diff line number Diff line change
Expand Up @@ -165,15 +165,18 @@ def device_read( self, address ):
# Read USB a single byte to see if a valid command has been received
command = self.usb_read()[0]
if command != address:
print ("ERROR: '0x{0:2x}' does not match expected command '0x{0:2x}".format( command, address ) )
return None
# print ("ERROR: '0x{0:2x}' does not match expected command '0x{1:2x}".format( command, address ) )
# return None
# If the command doesn't match what was expected, try interpreting the first byte as the length.
# This seems to happen when issuing multiple read commands in a row.
length = command
else:
# Valid command, read next byte to determine length of command
length = self.usb_read()[0]

if self.debug_mode:
print ( "READ CMD:", command )

# Valid command, read next byte to determine length of command
length = self.usb_read()[0]

if self.debug_mode:
print ( "READ LEN:", length )

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