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/**
* buttons.c - Provides ability to read button state.
* Copyright (C) 2020 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* See the GNU General Public License for more details.
*/
#include "buttons.h"
#include "hal.h"
unsigned char button_state = 0;
static void buttonStateHandler(void *arg)
{
int pad = (unsigned int)arg & 0xFF;
int bit = 1 << ((unsigned int)arg >> 8);
if (!palReadPad(GPIOA, pad)) {
if ((button_state & bit) != bit)
button_state |= bit;
} else {
if ((button_state & bit) == bit)
button_state &= ~(bit);
}
}
void buttons_init()
{
palSetPadMode(GPIOA, 0, PAL_MODE_INPUT_PULLUP); // Joy A (UL)
palSetPadMode(GPIOA, 1, PAL_MODE_INPUT_PULLUP); // Joy B (UR)
palSetPadMode(GPIOA, 2, PAL_MODE_INPUT_PULLUP); // Joy C (DR)
palSetPadMode(GPIOA, 3, PAL_MODE_INPUT_PULLUP); // Joy D (DL)
palSetPadMode(GPIOA, 6, PAL_MODE_INPUT_PULLUP); // Joy button
palSetPadMode(GPIOA, 7, PAL_MODE_INPUT_PULLUP); // Button 1
palSetPadMode(GPIOA, 9, PAL_MODE_INPUT_PULLUP); // Button 2
palSetPadMode(GPIOA, 10, PAL_MODE_INPUT_PULLUP); // Button 3
palEnablePadEvent(GPIOA, 0, PAL_EVENT_MODE_BOTH_EDGES);
palEnablePadEvent(GPIOA, 1, PAL_EVENT_MODE_BOTH_EDGES);
palEnablePadEvent(GPIOA, 2, PAL_EVENT_MODE_BOTH_EDGES);
palEnablePadEvent(GPIOA, 3, PAL_EVENT_MODE_BOTH_EDGES);
palEnablePadEvent(GPIOA, 6, PAL_EVENT_MODE_BOTH_EDGES);
palEnablePadEvent(GPIOA, 7, PAL_EVENT_MODE_BOTH_EDGES);
palEnablePadEvent(GPIOA, 9, PAL_EVENT_MODE_BOTH_EDGES);
palEnablePadEvent(GPIOA, 10, PAL_EVENT_MODE_BOTH_EDGES);
palSetPadCallback(GPIOA, 0, buttonStateHandler, (void *)0x0700);
palSetPadCallback(GPIOA, 1, buttonStateHandler, (void *)0x0601);
palSetPadCallback(GPIOA, 2, buttonStateHandler, (void *)0x0502);
palSetPadCallback(GPIOA, 3, buttonStateHandler, (void *)0x0403);
palSetPadCallback(GPIOA, 6, buttonStateHandler, (void *)0x0306);
palSetPadCallback(GPIOA, 7, buttonStateHandler, (void *)0x0207);
palSetPadCallback(GPIOA, 9, buttonStateHandler, (void *)0x0109);
palSetPadCallback(GPIOA, 10, buttonStateHandler, (void *)0x000A);
}
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