[visionegg] Re: LPT: trigger_in only on change from 1 to 0

  • From: Andrew Straw <andrew.straw@xxxxxxxxxxxxxxx>
  • To: visionegg@xxxxxxxxxxxxx
  • Date: Sun, 4 May 2003 06:29:50 -0600

Hi Christoph,

Sorry -- disregard my previous answer. I have realized the source of your troubles.

the command:
input_value = raw_lpt_module.inp(0x379) & 0x20 # pin nr 12
if input_value == 1:
    do something

The "&" operator is a binary, bit-wise operator. So, don't test "if input_value == 1:" test "if input_value == 0x20:" or just "if input_value:"

That should do the trick!

Cheers!
Andrew

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