mirror of
https://github.com/google/mozc-devices.git
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67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
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* Copyright 2012 Google Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/*
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* USB space key.
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* Connect a nomally-open switch to PB0. The device works as a space bar.
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*/
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#include <avr/io.h>
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#include <avr/wdt.h>
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#include <util/delay.h> /* for _delay_ms() */
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#include "usb_keyboard.h"
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int __attribute__((noreturn)) main(void)
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{
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PORTB = 0xff;
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wdt_enable(WDTO_1S);
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initUsbKeyboard();
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/* sets up timer for button polling interval */
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/* timer 1 CTC mode, counts up at f[clock]/8 [Hz] */
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TCCR1B = (1 << WGM12) | (1 << CS11);
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TCNT1 = 0;
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OCR1A = F_CPU / 8 / 100; /* 100Hz, T=10 milliseconds */
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uchar key = 0;
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uchar lastKey = 0;
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while(1) { /* main event loop */
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wdt_reset();
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usbPoll();
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/* samples the key input every 10 milliseconds to avoid chattering */
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if (bit_is_clear(TIFR, OCF1A)) {
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continue;
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}
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TIFR |= _BV(OCF1A); /* clear OCF1A */
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if(usbInterruptIsReady()){
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key = bit_is_clear(PINB, PINB0) ? KEYCODE_SPACE : KEYCODE_NONE;
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if (key != lastKey) {
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lastKey = key;
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prepareInterruptReport(key);
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}
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}
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}
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}
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