How about real V / I readings?
-ichan
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In The Analog Schematic
the output of the first OpAmp you can read I/V.
If you see the schematic
(simulation_voltage_control)
Output Of U2B = Vout / 11 (min 0v max 3v or 4v)
(simulation_Ampere_control)
Output Of U2B = Iout (min 0V=0A & Max 4v=4A)
PS: For Simulation TouchScreen In Proteus You Need This Model
http://www.tanu-sha.narod.ru/ts128x64.html