The EVK1100 provides a joystick to design Human to Machine Interface for software developments.
The joystick inputs are low level active1. The pinout is as follows:
Joystick Pin | Joystick Direction | GPIO Name | Alternate function used |
---|---|---|---|
Joy_A | LEFT | PA 25 | SCAN_0 |
Joy_B | UP | PA 26 | SCAN_1 |
Joy_C | DOWN | PA 27 | SCAN_2 |
Joy_D | RIGHT | PA 28 | SCAN_3 |
EXTINT | PUSH | PA 20 | EXTINT_8 |
In order to use the joystick, two ways are available:
Polling on the GPIO Port Value Register
Using GPIO interrupts to get state changes
Using GPIO interrupts need to: