106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
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/*
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* Copyright (c) 2006, Technical University of Munich
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Simon Barner <barner@in.tum.de>
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*
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* @(#)$$
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*/
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#include "contiki-raven.h"
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#include "contiki.h"
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#include "usb_drv.h"
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#include "usb_descriptors.h"
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#include "usb_specific_request.h"
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#include <util/delay.h>
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uint8_t checkForFinger(void);
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void
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init_lowlevel(void)
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{
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Leds_init();
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Leds_off();
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if (checkForFinger()) {
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usb_mode = mass_storage;
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}
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return;
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}
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uint8_t checkForFinger(void)
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{
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uint8_t tests;
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uint8_t matches;
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/*
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Three pads on RZUSBSTICK go: GND PD3 PD2
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We pulse PD3, and check for that pattern on PD2.
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A (moist) finger across those three pads should be enough
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to bridge these
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*/
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//Output
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DDRD |= 1<<PD3;
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//Input
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DDRD &= ~(1<<PD2);
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tests = 100;
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matches = 0;
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while(tests) {
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//Set bit PD3 to value of LSB of 'tests'
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PORTD = (PORTD & ~(1<<PD3)) | ( (tests & 0x01) << PD3);
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//Allow changes to propogate
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_delay_us(1);
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//Check if PD2 matches what we set PD3 to
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if ((PIND & (1<<PD2)) == ((tests & 0x01) << PD2)) {
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matches++;
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}
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tests--;
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}
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if (matches > 70) {
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return 1;
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}
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return 0;
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}
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