Running the STMPE801 port expander GUI

UM0401

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The appropriate slave device should be chosen before enabling the interrupt. The Interrupt

settings are configured into the internal configuration registers as soon as the "SET" button

is clicked. The Interrupt window turns green to indicate that the interrupt is enabled. In order

to turn off all interrupt settings, click on the "Reset Interrupt" button . This is shown in

Figure 17.

The ISR can be monitored using the "Read GPIO Interrupt Status" panel. Once the "START"

button is clicked, the ISR is read at 100ms intervals and the results are displayed with

corresponding green squares for GPIOS with state change. This monitoring can be stopped

by clicking on the "STOP" button. All GPIOS are reset to default state by the "CLEAR

PANEL" button. The clear panel does not work when the monitoring is running

Figure 17.

Interrupt enabled with indication of current interrupt status in the ISR -

screen shot