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CLCD Display and Adaptor Board
C-14 Copyright © 2003-2007 ARM Limited. All rights reserved. ARM DUI 0224F
Example C-2 Configuring and reading the TSCI interface
Configure the SSP interface
Configure the TSCI registers
Enable the touch screen pendown interrupt (on SIC)
...
On touch screen pendown interrupts
... touch screen interrupt handler
Enable the touch screen event timer (TIMER 1-4) for approx. 2mS intervals
...
On touch screen timer events
... touch screen reading
If (pendown flag (PSM) is cleared)
Disable the touch screen event timer
Clear and re-enable the touch screen interrupt
Else
Read the pen X/Y values
Draw the pen position on the screen
Note
The selftest example provided on the CD uses a simple polled system to determine pen
down and timer events.
The pseudo code in Example C-2 is recommended for OS ports as they typically require
interrupt-driven device drivers.