instruction

Hi all,
i am trying to write a program made by some instructions that configure
the parallel port as an input makes 10 readings of a single channel, configure
the port as an output and writes on it.  

I am a bit confused about the procedure.
I write this 

//configuration
insn[0].insn=INSN_CONFIG
insn[0].data=COMEDI_OUTPUT
insn[0].chanspec=CR_PACK(channel,range,aref)


//writing


insn[1].insn=INSN_BITS
insn[1].data=data_ar
insn[1].subdev=subdevice
insn[1].chanspec=CR_PACK(channel,range,aref)
insn[1].n=10

are they correct ? I don't understand how to set the parameter of chanspec
for the parallel port
Has anyone used this configuration?
Thanks a lot Lorenzo.

Received on 2004-04-27Z11:14:03