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/***************************************************************
*
* OpenPICC - ISO 14443 Layer 2 Type A Sniffer
* Also serves as PoC code for iso14443_layer2a usage
*
* Copyright 2008 Henryk Plötz <henryk@ploetzli.ch>
*
***************************************************************
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; version 2.
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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <FreeRTOS.h>
#include <board.h>
#include <task.h>
#include <errno.h>
#include "openpicc.h"
#include "iso14443_sniffer.h"
#include "iso14443_layer2a.h"
#include "iso14443a_miller.h"
#include "usb_print.h"
#include "cmd.h"
static iso14443_frame rx_frame;
void iso14443_sniffer (void *pvParameters)
{
(void)pvParameters;
int res;
/* Delay until USB print etc. are ready */
vTaskDelay(1000 * portTICK_RATE_MS);
do {
res = iso14443_layer2a_init(0);
if(res < 0) {
usb_print_string("Sniffer: Initialization failed\n\r");
vTaskDelay(10000 * portTICK_RATE_MS);
}
} while(res < 0);
usb_print_string("Waiting for carrier. ");
while(iso14443_wait_for_carrier(1000 * portTICK_RATE_MS) != 0) {
}
usb_print_string("Carrier detected.\n\r");
iso14443_l2a_rx_start();
while(true) {
ssc_dma_rx_buffer_t *buffer = 0;
res = iso14443_receive(NULL, &buffer, 20000 * portTICK_RATE_MS);
if(res >= 0) {
DumpStringToUSB("\n\r");
DumpTimeToUSB(xTaskGetTickCount());
usb_print_string(": Frame received, consists of ");
DumpUIntToUSB(res);
usb_print_string(" transfers (");
DumpUIntToUSB(buffer->reception_mode->transfersize_ssc);
usb_print_string(" bits from SSC each)\n\r ");
if(buffer->len_transfers < 200)
DumpBufferToUSB((char*)buffer->data, (buffer->len_transfers * buffer->reception_mode->transfersize_pdc)/8);
else {
DumpBufferToUSB((char*)buffer->data, (200 * buffer->reception_mode->transfersize_pdc)/8);
usb_print_string("...");
}
usb_print_string("\n\r ");
iso14443a_decode_miller(&rx_frame, buffer);
usb_print_string("Decodes to ");
DumpUIntToUSB(rx_frame.numbytes);
usb_print_string(" bytes and ");
DumpUIntToUSB(rx_frame.numbits);
usb_print_string(" bits: ");
DumpBufferToUSB((char*)rx_frame.data, rx_frame.numbytes + (rx_frame.numbits+7)/8 );
usb_print_string("\n\r");
portENTER_CRITICAL();
buffer->state = FREE;
portEXIT_CRITICAL();
} else {
if(res != -ETIMEDOUT) {
usb_print_string("Receive error: ");
switch(res) {
case -ENETDOWN: usb_print_string("PLL is not locked or PLL lock lost\n\r"); break;
case -EBUSY: usb_print_string("A Tx is currently running or pending, can't receive\n\r"); break;
case -EALREADY: usb_print_string("There's already an iso14443_receive() invocation running\n\r"); break;
}
vTaskDelay(1000 * portTICK_RATE_MS); // FIXME Proper error handling, e.g. wait for Tx end in case of EBUSY
} else if(0) {
DumpStringToUSB("\n\r");
DumpTimeToUSB(xTaskGetTickCount());
usb_print_string(": -- Mark --");
}
}
}
}
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