Implement 14b sniff standalone mode

armsrc/Standalone/hf_14bsniff.c

@@ -0,0 +1,51 @@
+/*
+ * `hf_14bsniff` passively sniffs ISO14b frames.
+ * *
+ * On entering stand-alone mode, this module will start sniffing ISO14b frames.
+ * This will be stored in the normal trace buffer (ie: in RAM -- will be lost
+ * at power-off).
+ *
+ * Short-pressing the button again will stop sniffing and standalone mode will
+ * exit.
+ *
+ * LEDs:
+ * - LED1: sniffing
+ * - LED2: sniffed tag command, turns off when finished sniffing reader command
+ * - LED3: sniffed reader command, turns off when finished sniffing tag command
+ *
+ * This module emits debug strings during normal operation -- so try it out in
+ * the lab connected to PM3 client before taking it into the field.
+ *
+ * Caveats / notes:
+ * - Trace buffer will be cleared on starting stand-alone mode.
+ * - This module will terminate if the trace buffer is full.
+ * - Like normal sniffing mode, timestamps overflow after 5 min 16 sec.
+ *   However, the trace buffer is sequential, so will be in the correct order.
+ */
+
+#include "standalone.h" // standalone definitions
+#include "proxmark3_arm.h"
+#include "iso14443b.h"
+#include "util.h"
+#include "appmain.h"
+#include "dbprint.h"
+#include "ticks.h"
+#include "BigBuf.h"
+
+void ModInfo(void) {
+    DbpString(" HF 14B SNIFF,  a ISO14443b sniffer");
+}
+
+void RunMod(void) {
+    StandAloneMode();
+
+    Dbprintf(_YELLOW_("HF 14B SNIFF started"));
+
+    SniffIso14443b();
+
+    Dbprintf("Stopped sniffing");
+    SpinDelay(200);
+
+    Dbprintf("-=[ exit ]=-");
+    LEDsoff();
+}