The EVK1100 provides three push buttons to design Human to Machine Interface for software developments.
Pinout
The push buttons inputs are low level active1. The pinout is as follows:
| Push Button | GPIO Name | Alternate function used |
|---|---|---|
| PB0 | PX 16 | |
| PB1 | PX 19 | |
| PB2 | PX 22 |
Figure 1. Hardware Schematic
Using Interrupts
In order to use a push button, two ways are available:
-
Polling on the GPIO Port Value Register
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Using GPIO interrupts to get state changes
Using GPIO interrupt needs to:
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Register an interrupt handler for the input
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Set the GPIO control bit for the input
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Set the GPIO glitch filter bit for the input
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Configure the GPIO interrupt mask bit for the input to act either on rising edge, falling edge or input change
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Set the GPIO interrupt enable bit for the input