circuitpython/shared-module/gamepad/__init__.c
Radomir Dopieralski 9bcc1057ca Gracefully reset the gamepad module (#356)
If a soft reset happens while the gamepad module is scanning for button
presses, there is a moment when the pins get de-initialized, but the
gamepad module is still trying to read them, which ends in a crash.
We can avoid it by disabling scanning on reset.
2017-10-21 22:39:20 -04:00

56 lines
1.9 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Radomir Dopieralski for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include "__init__.h"
#include "GamePad.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
void gamepad_tick(void) {
if (!gamepad_singleton) {
return;
}
uint8_t gamepad_current = 0;
for (int i=0; i<8; ++i) {
digitalio_digitalinout_obj_t* pin = gamepad_singleton->pins[i];
if (!pin) {
break;
}
if (!common_hal_digitalio_digitalinout_get_value(pin)) {
gamepad_current |= 1<<i;
}
}
gamepad_singleton->pressed |= gamepad_singleton->last & gamepad_current;
gamepad_singleton->last = gamepad_current;
}
void gamepad_reset(void) {
gamepad_singleton = NULL;
}