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The host application program can get touch reports from the TCS as follows:
•
the TCS can send them spontaneously
•
the host can poll the TCS for them
Any given application program should use only one of these methods; Polled Touch Mode
specifies which method will be used. When Polled Touch Mode is set, the TCS holds the first
touch report and discards all subsequent touch reports until polled by the host. The host polls the
TCS by sending the Read Touchkey Status command to retrieve the touch report. When Polled
Touch Mode is reset, touch reports are sent to the host as they occur, and they are not held. If
polled, the TCS would report "0" indicating that no polled touch report is pending.
Problems arise in two circumstances:
1.
Polled Touch Mode is set but the application program fails to use the Read Touchkey Status
command to poll the TCS for a touch report.
2.
Polled Touch Mode is reset and the application program sends a Read Touchkey Status
command.
In both instances, the touch panel may appear to be dead. In the first case, the host never receives
touch reports because they are never polled for and are never spontaneously sent. In the second
case, touch reports are being sent spontaneously, but are probably ignored by the application
program. Sending a Read Touchkey Status command implies that the programmer wants touch
reports only through polling. In this case, the response to the Read Touchkey Status command
always indicates a touchkey value of zero.
Summary of Contents for Dynapro ET TCS
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