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/*
Project: DS1992 memory iButton dumper
Author: Florian Jung (flo@windfisch.org)
Copyright: (c) 2015 by Florian Jung
License: GNU GPL v3 (see LICENSE)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License version 3 as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
This project is based on the code for the AVR ATtiny USB Tutorial at
http://codeandlife.com/ by Joonas Pihlajamaa, joonas.pihlajamaa@iki.fi,
which is in turn based on the V-USB example code by Christian Starkjohann
(Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH)
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <avr/eeprom.h>
#include <util/delay.h>
#include <string.h>
#include "usbdrv/usbdrv.h"
#include "1wire.h"
#define LED_BLUE (1<<5)
#define LED_RED (1<<4)
#define LED_GREEN (1<<3)
#define FUNC_READ 0x42
#define FUNC_WRITE 0x21
#define FUNC_START_BOOTLOADER 30
#define FUNC_GET_TYPE 0xFE
volatile int got_data = 0; // set to 1, if we get data to write from the PC
void jump_to_bootloader(void)
{
cli();
wdt_enable(WDTO_15MS);
while (1);
}
static uchar replyBuffer[130]="Hello world initial";
usbMsgLen_t usbFunctionSetup(uchar data[8])
{
usbRequest_t *rq = (void *) data;
int len = 1;
switch (rq->bRequest)
{
case FUNC_GET_TYPE:
replyBuffer[0]=10;
len = 1;
break;
case FUNC_START_BOOTLOADER:
jump_to_bootloader();
len = 0;
break;
case FUNC_READ:
got_data = 1;
return USB_NO_MSG;
case FUNC_WRITE:
PORTC ^= LED_RED;
//strcpy(replyBuffer, "Hello world");
//len = strlen(replyBuffer)+1;
len = 130;
break;
}
usbMsgPtr = replyBuffer;
return len;
}
volatile int count = 5;
uchar usbFunctionWrite(uint8_t * data, uchar len)
{
memcpy(replyBuffer,data,len);
replyBuffer[len]='\0';
return len;
}
void usb_disconnect()
{
USB_INTR_ENABLE &= ~(1 << USB_INTR_ENABLE_BIT);
usbDeviceDisconnect();
}
void usb_reconnect()
{
cli();
usbDeviceDisconnect(); // enforce re-enumeration
for (int i = 0; i < 250; i++)
{ // wait 500 ms
wdt_reset(); // keep the watchdog happy
_delay_ms(10);
}
usbDeviceConnect();
USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT);
sei();
}
int main(void)
{
uint32_t c = 0;
DDRC = 0x38; // LEDs as output
PORTC |= LED_BLUE | LED_RED | LED_GREEN;
DDRD &= ~0xF3; // connector ports as input
DDRB &= ~0x3C;
PORTD &= ~0xF3; // disable pullups for unused ports
PORTB &= ~0x0C;
PORTB |= 0x30; // enable pullups for PB4 and 5
replyBuffer[129] = 0;
cli();
wdt_enable(WDTO_1S); // enable 1s watchdog timer
usbInit();
usbDeviceDisconnect(); // enforce re-enumeration
for (int i = 0; i < 250; i++)
{ // wait 500 ms
wdt_reset(); // keep the watchdog happy
_delay_ms(10);
}
usbDeviceConnect();
sei(); // Enable interrupts after re-enumeration
while (1)
{
wdt_reset(); // keep the watchdog happy
usbPoll();
if (++c % (got_data ? 1500 : 3000) == 0)
{
PORTC^=LED_BLUE;
PORTC |= LED_RED | LED_GREEN;
}
if (c % 12000 == 0)
{
uint8_t result = w1_reset();
if (result == 0) // device detected
{
PORTC &= ~LED_GREEN;
ds1992_read(0, replyBuffer, 128);
}
else if (result == 1) // no presence pulse == no device detected
PORTC &= ~LED_RED;
else // short circuit detected
PORTC &= ~(LED_RED | LED_GREEN);
}
}
jump_to_bootloader();
return 0;
}
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