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Altera_Forum's avatar
Altera_Forum
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15 years ago

LCD touch panel and FPGA

Hi, I wanted to ask if I could interface a touch panel LCD with FPGA without using microcontrollers. I've tried searching the internet for usefull info regarding this kind of interface but from ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

You can use external ADC and FPGA io pins for apply voltage to matrix. (resestive matrix). Apply 0 to X, +3.3v to X'. Measure voltage at Y or Y'. Then set X and X' to input, Y to 0 and Y' to +3.3v. Measure voltage at X or X'.

http://en.wikipedia.org/wiki/resistive_touchscreen