Commit a first version of an iso 14443 layer 2 and a passive sniffer. Works for short frames, and sometimes even for long frames. Pending some major cleanup

git-svn-id: https://svn.openpcd.org:2342/trunk@408 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

1 files changed, 109 insertions, 0 deletions

diff --git a/openpicc/application/iso14443_sniffer.c b/openpicc/application/iso14443_sniffer.c
new file mode 100644
index 0000000..d5cf9c2
--- /dev/null
+++ b/openpicc/application/iso14443_sniffer.c
@@ -0,0 +1,109 @@
+/***************************************************************
+ *
+ * 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 --");
+			}
+		}
+	}
+}