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