Push buttons
Description
The EVK1101 provides two push buttons to design Human to Machine Interface for software developments.
Back to the Hardware Reference Page
Pinout
The push buttons inputs are low level active. (ie : the PVR register value is 0 when the button is pressed, and 1 otherwise)
The pinout is as follow :
| Push Button | GPIO Name | Alternate function used |
|---|---|---|
| 1 | PB 2 | EIC/EXTINT 6 |
| 2 | PB 3 | EIC/EXTINT 7 |
Back to the Hardware Reference Page
Using Interrupts
In order to use a push button, two ways are available :
- Polling on the GPIO Port Value Register,
- Using GPIO interrupts to get state changes.
Using GPIO interrupt needs to:
- Register an interrupt handler for the input (depending on the compiler you are using),
- Set the GPIO control bit for the input,
- Set the GPIO glitch filter bit for the input,
- Configure the GPIO interrupt mask bit for the input to act either on rising edge, falling edge or input change,
- Set the GPIO interrupt enable bit for the input.
Back to the Hardware Reference Page