Interesting thread.
About point 2).
Since it is an analog signal, I cannot see a way of diect interrupt. Only regular interrupts to start analog conversion and check.
Ioannis
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Re: 4 Wire resistive touch screen, Need help
Interesting thread.
About point 2).
Since it is an analog signal, I cannot see a way of diect interrupt. Only regular interrupts to start analog conversion and check.
Ioannis
|
Re: 4 Wire resistive touch screen, Need help
Megahertz,
That code I posted above I wrote it some time ago. It was part of a program that sent the touchscreen coordinates to my PC through the USB port to move the mouse cursor. I modified the USBMouse program that came with PBP to send the 4-wire resistive touchscreen coordinates to the PC.
The sub routine "CALIBRATE_TOUCHSCREEN" was actually a way of "converting" the 10-bit ADC reading comming out of the PIC ADC port to the proper pixel coordinates I needed to make the mouse cursor move accross the PC screen. These values were found experimentally, pretty much trial and error. Now, for my 320x240 LCD display with touchscreen I wrote a calibration routine which is a lot more involved than the code that you have above. If you need the code, let me know.
Robert
"No one is completely worthless. They can always serve as a bad example."
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