proxmark3/armsrc/appmain.c

//-----------------------------------------------------------------------------
// Jonathan Westhues, Mar 2006
// Edits by Gerhard de Koning Gans, Sep 2007 (##)
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// The main application code. This is the first thing called after start.c
// executes.
//-----------------------------------------------------------------------------
#include <stdarg.h>
#include <inttypes.h>
#include "usb_cdc.h"
#include "proxmark3.h"
#include "apps.h"
#include "fpga.h"
#include "util.h"
#include "printf.h"
#include "string.h"
#include "legicrf.h"
#include "legicrfsim.h"
#include "lfsampling.h"
#include "BigBuf.h"
#include "mifareutil.h"

#define DEBUG 1

#ifdef WITH_LCD
 #include "LCD.h"
#endif

#ifdef WITH_SMARTCARD
#include "i2c.h"
#endif

#ifdef WITH_FPC
#include "usart.h"
#endif

#ifdef WITH_FLASH
#include "flashmem.h"
#endif

//=============================================================================
// A buffer where we can queue things up to be sent through the FPGA, for
// any purpose (fake tag, as reader, whatever). We go MSB first, since that
// is the order in which they go out on the wire.
//=============================================================================

#define TOSEND_BUFFER_SIZE (9*MAX_FRAME_SIZE + 1 + 1 + 2)  // 8 data bits and 1 parity bit per payload byte, 1 correction bit, 1 SOC bit, 2 EOC bits
uint8_t ToSend[TOSEND_BUFFER_SIZE];
int ToSendMax = -1;
static int ToSendBit;
struct common_area common_area __attribute__((section(".commonarea")));

void ToSendReset(void) {
	ToSendMax = -1;
	ToSendBit = 8;
}

void ToSendStuffBit(int b) {
	if(ToSendBit >= 8) {
		ToSendMax++;
		ToSend[ToSendMax] = 0;
		ToSendBit = 0;
	}

	if(b)
		ToSend[ToSendMax] |= (1 << (7 - ToSendBit));

	ToSendBit++;

	if(ToSendMax >= sizeof(ToSend)) {
		ToSendBit = 0;
		DbpString("ToSendStuffBit overflowed!");
	}
}

void PrintToSendBuffer(void) {
	DbpString("Printing ToSendBuffer:");
	Dbhexdump(ToSendMax, ToSend, 0);
}

void print_result(char *name, uint8_t *buf, size_t len) {

	uint8_t *p = buf;
	uint16_t tmp = len & 0xFFF0;

	for(; p-buf < tmp; p += 16) {
		Dbprintf("[%s: %02d/%02d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
				name,
				p-buf,
				len,
				p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]
			);
	}
	if (len % 16 != 0) {
		char s[46] = {0};
		char *sp = s;
		for (; p-buf < len; p++ ) {
			sprintf(sp, "%02x ", p[0] );
			sp += 3;
		}
		Dbprintf("[%s: %02d/%02d] %s", name, p-buf, len, s);
	}
}

//=============================================================================
// Debug print functions, to go out over USB, to the usual PC-side client.
//=============================================================================

void DbpStringEx(char *str, uint32_t cmd) {
#if DEBUG
	uint8_t len = strlen(str);
	cmd_send(CMD_DEBUG_PRINT_STRING, len, cmd, 0, (uint8_t*)str, len);
#endif
}

void DbpString(char *str) {
#if DEBUG
	DbpStringEx(str, 0);
#endif
}

#if 0
void DbpIntegers(int x1, int x2, int x3) {
	cmd_send(CMD_DEBUG_PRINT_INTEGERS,x1,x2,x3,0,0);
}
#endif
void DbprintfEx(uint32_t cmd, const char *fmt, ...) {
#if DEBUG
	// should probably limit size here; oh well, let's just use a big buffer
	char output_string[128] = {0x00};
	va_list ap;
	va_start(ap, fmt);
	kvsprintf(fmt, output_string, 10, ap);
	va_end(ap);

	DbpStringEx(output_string, cmd);
#endif
}

void Dbprintf(const char *fmt, ...) {
#if DEBUG
	// should probably limit size here; oh well, let's just use a big buffer
	char output_string[128] = {0x00};
	va_list ap;

	va_start(ap, fmt);
	kvsprintf(fmt, output_string, 10, ap);
	va_end(ap);

	DbpString(output_string);
#endif
}

// prints HEX & ASCII
void Dbhexdump(int len, uint8_t *d, bool bAsci) {
#if DEBUG
	int l=0, i;
	char ascii[9];

	while (len > 0) {

		l = (len > 8) ? 8 : len;

		memcpy(ascii, d, l);
		ascii[l] = 0;

		// filter safe ascii
		for (i=0; i<l; i++) {
            if (ascii[i] < 32 || ascii[i] > 126) {
                ascii[i] = '.';
			}
        }

		if (bAsci)
			Dbprintf("%-8s %*D", ascii, l, d, " ");
		else
			Dbprintf("%*D", l, d, " ");

		len -= 8;
		d += 8;
	}
#endif
}

//-----------------------------------------------------------------------------
// Read an ADC channel and block till it completes, then return the result
// in ADC units (0 to 1023). Also a routine to average 32 samples and
// return that.
//-----------------------------------------------------------------------------
static uint16_t ReadAdc(int ch) {

	// Note: ADC_MODE_PRESCALE and ADC_MODE_SAMPLE_HOLD_TIME are set to the maximum allowed value.
	// AMPL_HI is are high impedance (10MOhm || 1MOhm) output, the input capacitance of the ADC is 12pF (typical). This results in a time constant
	// of RC = (0.91MOhm) * 12pF = 10.9us. Even after the maximum configurable sample&hold time of 40us the input capacitor will not be fully charged.
	//
	// The maths are:
	// If there is a voltage v_in at the input, the voltage v_cap at the capacitor (this is what we are measuring) will be
	//
	//       v_cap = v_in * (1 - exp(-SHTIM/RC))  =   v_in * (1 - exp(-40us/10.9us))  =  v_in * 0,97                   (i.e. an error of 3%)

	AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
    AT91C_BASE_ADC->ADC_MR =
				  ADC_MODE_PRESCALE(63)				// ADC_CLK = MCK / ((63+1) * 2) = 48MHz / 128 = 375kHz
				| ADC_MODE_STARTUP_TIME(1)			// Startup Time = (1+1) * 8 / ADC_CLK = 16 / 375kHz = 42,7us   Note: must be > 20us
				| ADC_MODE_SAMPLE_HOLD_TIME(15);	// Sample & Hold Time SHTIM = 15 / ADC_CLK = 15 / 375kHz = 40us

	AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ch);
	AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;

	while (!(AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ch))) {};

	return (AT91C_BASE_ADC->ADC_CDR[ch] & 0x3FF);
}

// was static - merlok
uint16_t AvgAdc(int ch) {
	uint16_t a = 0;
	for(uint8_t i = 0; i < 32; i++)
		a += ReadAdc(ch);

	//division by 32
	return (a + 15) >> 5;
}

void MeasureAntennaTuning(void) {

	uint8_t LF_Results[256];
	uint32_t i, adcval = 0, peak = 0, peakv = 0, peakf = 0;
	uint32_t v_lf125 = 0, v_lf134 = 0, v_hf = 0;	// in mV

	memset(LF_Results, 0, sizeof(LF_Results));
	LED_B_ON();

/*
 * Sweeps the useful LF range of the proxmark from
 * 46.8kHz (divisor=255) to 600kHz (divisor=19) and
 * read the voltage in the antenna, the result left
 * in the buffer is a graph which should clearly show
 * the resonating frequency of your LF antenna
 * ( hopefully around 95 if it is tuned to 125kHz!)
 */

  	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
	SpinDelay(50);

	for  (i = 255; i >= 19; i--) {
		WDT_HIT();
		FpgaSendCommand(FPGA_CMD_SET_DIVISOR, i);
		SpinDelay(20);
		adcval = ((MAX_ADC_LF_VOLTAGE * AvgAdc(ADC_CHAN_LF)) >> 10);
        if (i == 95)
            v_lf125 = adcval; // voltage at 125Khz
        if (i == 89)
            v_lf134 = adcval; // voltage at 134Khz

		LF_Results[i] = adcval >> 9; // scale int to fit in byte for graphing purposes
		if(LF_Results[i] > peak) {
			peakv = adcval;
			peakf = i;
			peak = LF_Results[i];
		}
	}

	LED_A_ON();
	// Let the FPGA drive the high-frequency antenna around 13.56 MHz.
	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
	SpinDelay(50);
	v_hf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;

	// RDV40 will hit the roof, try other ADC channel used in that hardware revision.
	if ( v_hf > MAX_ADC_HF_VOLTAGE-300 ) {
		v_hf = (MAX_ADC_HF_VOLTAGE_RDV40 * AvgAdc(ADC_CHAN_HF_RDV40)) >> 10;
	}

	uint64_t arg0 = v_lf134;
	arg0 <<= 32;
	arg0 |= v_lf125;

	uint64_t arg2 = peakv;
	arg2 <<= 32;
	arg2 |= peakf;

	cmd_send(CMD_MEASURED_ANTENNA_TUNING, arg0, v_hf, arg2, LF_Results, 256);
	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
	LEDsoff();
}

void MeasureAntennaTuningHf(void) {
	uint16_t volt = 0;	// in mV
	// Let the FPGA drive the high-frequency antenna around 13.56 MHz.
	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
	SpinDelay(50);
	volt = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
	bool use_high = ( volt > MAX_ADC_HF_VOLTAGE-300 );

	while( !BUTTON_PRESS() ){
		SpinDelay(20);
		if ( !use_high ) {
			volt = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
		} else {
			volt = (MAX_ADC_HF_VOLTAGE_RDV40 * AvgAdc(ADC_CHAN_HF_RDV40)) >> 10;
		}
		DbprintfEx(FLAG_NONEWLINE, "%u mV / %5u V", volt, (uint16_t)(volt/1000));
	}
	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
	DbprintfEx(FLAG_NOOPT, "\n[+] cancelled", 1);
}

void ReadMem(int addr) {
	const uint8_t *data = ((uint8_t *)addr);

    Dbprintf("%x: %02x %02x %02x %02x %02x %02x %02x %02x", addr, data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7]);
}

/* osimage version information is linked in */
extern struct version_information version_information;
/* bootrom version information is pointed to from _bootphase1_version_pointer */
extern char *_bootphase1_version_pointer, _flash_start, _flash_end, _bootrom_start, _bootrom_end, __data_src_start__;
void SendVersion(void) {
	char temp[USB_CMD_DATA_SIZE]; /* Limited data payload in USB packets */
	char VersionString[USB_CMD_DATA_SIZE] = { '\0' };

	/* Try to find the bootrom version information. Expect to find a pointer at
	 * symbol _bootphase1_version_pointer, perform slight sanity checks on the
	 * pointer, then use it.
	 */
	char *bootrom_version = *(char**)&_bootphase1_version_pointer;

	strncat(VersionString, " [ ARM ]\n", sizeof(VersionString) - strlen(VersionString) - 1);

	if( bootrom_version < &_flash_start || bootrom_version >= &_flash_end ) {
		strcat(VersionString, "bootrom version information appears invalid\n");
	} else {
		FormatVersionInformation(temp, sizeof(temp), " bootrom: ", bootrom_version);
		strncat(VersionString, temp, sizeof(VersionString) - strlen(VersionString) - 1);
	}

	FormatVersionInformation(temp, sizeof(temp), "      os: ", &version_information);
	strncat(VersionString, temp, sizeof(VersionString) - strlen(VersionString) - 1);

	strncat(VersionString, "\n [ FPGA ]\n", sizeof(VersionString) - strlen(VersionString) - 1);

	for (int i = 0; i < fpga_bitstream_num; i++) {
		strncat(VersionString, fpga_version_information[i], sizeof(VersionString) - strlen(VersionString) - 1);
		if (i < fpga_bitstream_num - 1) {
			strncat(VersionString, "\n", sizeof(VersionString) - strlen(VersionString) - 1);
		}
	}
	// Send Chip ID and used flash memory
	uint32_t text_and_rodata_section_size = (uint32_t)&__data_src_start__ - (uint32_t)&_flash_start;
	uint32_t compressed_data_section_size = common_area.arg1;
	cmd_send(CMD_ACK, *(AT91C_DBGU_CIDR), text_and_rodata_section_size + compressed_data_section_size, 0, VersionString, strlen(VersionString));
}

// measure the USB Speed by sending SpeedTestBufferSize bytes to client and measuring the elapsed time.
// Note: this mimics GetFromBigbuf(), i.e. we have the overhead of the UsbCommand structure included.
void printUSBSpeed(void) {
	Dbprintf("USB Speed");
	Dbprintf("  Sending USB packets to client...");

	#define USB_SPEED_TEST_MIN_TIME	1500	// in milliseconds
	uint8_t *test_data = BigBuf_get_addr();
	uint32_t end_time;

	uint32_t start_time = end_time = GetTickCount();
	uint32_t bytes_transferred = 0;

	LED_B_ON();
	while (end_time < start_time + USB_SPEED_TEST_MIN_TIME) {
		cmd_send(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, 0, USB_CMD_DATA_SIZE, 0, test_data, USB_CMD_DATA_SIZE);
		end_time = GetTickCount();
		bytes_transferred += USB_CMD_DATA_SIZE;
	}
	LED_B_OFF();

	Dbprintf("  Time elapsed............%dms", end_time - start_time);
	Dbprintf("  Bytes transferred.......%d", bytes_transferred);
    Dbprintf("  USB Transfer Speed PM3 -> Client = %d Bytes/s", 1000 * bytes_transferred / (end_time - start_time));
}

/**
  * Prints runtime information about the PM3.
**/
void SendStatus(void) {
	BigBuf_print_status();
	Fpga_print_status();
#ifdef WITH_FLASH
	Flashmem_print_status();
#endif
#ifdef WITH_SMARTCARD
	I2C_print_status();
#endif
#ifdef WITH_LF
	printConfig(); 		// LF Sampling config
	printT55xxConfig();	// LF T55XX Config
#endif
	printUSBSpeed();
	Dbprintf("Various");
	Dbprintf("  MF_DBGLEVEL.............%d", MF_DBGLEVEL);
	Dbprintf("  ToSendMax...............%d", ToSendMax);
	Dbprintf("  ToSendBit...............%d", ToSendBit);
	Dbprintf("  ToSend BUFFERSIZE.......%d", TOSEND_BUFFER_SIZE);
	printStandAloneModes();
	cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
}

// Show some leds in a pattern to identify StandAlone mod is running
void StandAloneMode(void) {

	DbpString("Stand-alone mode! No PC necessary.");

	SpinDown(50);
    SpinOff(50);
    SpinUp(50);
    SpinOff(50);
    SpinDown(50);
	SpinDelay(500);
}
// detection of which Standalone Modes is installed
// (iceman)
void printStandAloneModes(void) {

	DbpString("Installed StandAlone Mode");

#if defined(WITH_LF_ICERUN)
	DbpString("   LF sniff/clone/simulation -  aka IceRun (iceman)");
#endif
#if defined(WITH_HF_YOUNG)
	DbpString("   HF Mifare sniff/simulation - (Craig Young)");
#endif
#if defined(WITH_LF_SAMYRUN)
	DbpString("   LF HID26 standalone - aka SamyRun (Samy Kamkar)");
#endif
#if defined(WITH_LF_PROXBRUTE)
	DbpString("   LF HID ProxII bruteforce - aka Proxbrute (Brad Antoniewicz)");
#endif
#if defined(WITH_LF_HIDBRUTE)
	DbpString("   LF HID corporate 1000 bruteforce - aka Corporatebrute (Federico dotta & Maurizio Agazzini)");
#endif
#if defined(WITH_HF_MATTYRUN)
	DbpString("   HF Mifare sniff/clone - aka MattyRun (Matías A. Ré Medina)");
#endif
#if defined(WITH_HF_COLIN)
    DbpString("   HF Mifare ultra fast sniff/sim/clone - aka VIGIKPWN (Colin Brigato)");
#endif
#if defined(WITH_HF_BOG)
	DbpString("   HF 14a sniff standalone with ULC/ULEV1/NTAG auth storing in flashmem - aka BogitoRun (Bogito)");
#endif

	//DbpString("Running ");
	//Dbprintf("  Is Device attached to USB| %s", USB_ATTACHED() ? "Yes" : "No");
	//Dbprintf("  Is Device attached to FPC| %s", 0 ? "Yes" : "No");
	//Dbprintf("  Is USB_reconnect value   | %d", GetUSBreconnect() );
	//Dbprintf("  Is USB_configured value  | %d", GetUSBconfigured() );

	//.. add your own standalone detection based on with compiler directive you are used.
	// don't "reuse" the already taken ones, this will make things easier when trying to detect the different modes
	// 2017-08-06  must adapt the makefile and have individual compilation flags for all mods
	//
}

/*
OBJECTIVE
Listen and detect an external reader. Determine the best location
for the antenna.

INSTRUCTIONS:
Inside the ListenReaderField() function, there is two mode.
By default, when you call the function, you will enter mode 1.
If you press the PM3 button one time, you will enter mode 2.
If you press the PM3 button a second time, you will exit the function.

DESCRIPTION OF MODE 1:
This mode just listens for an external reader field and lights up green
for HF and/or red for LF. This is the original mode of the detectreader
function.

DESCRIPTION OF MODE 2:
This mode will visually represent, using the LEDs, the actual strength of the
current compared to the maximum current detected. Basically, once you know
what kind of external reader is present, it will help you spot the best location to place
your antenna. You will probably not get some good results if there is a LF and a HF reader
at the same place! :-)

LIGHT SCHEME USED:
*/
static const char LIGHT_SCHEME[] = {
		0x0, /* ----     | No field detected */
		0x1, /* X---     | 14% of maximum current detected */
		0x2, /* -X--     | 29% of maximum current detected */
		0x4, /* --X-     | 43% of maximum current detected */
		0x8, /* ---X     | 57% of maximum current detected */
		0xC, /* --XX     | 71% of maximum current detected */
		0xE, /* -XXX     | 86% of maximum current detected */
		0xF, /* XXXX     | 100% of maximum current detected */
};
static const int LIGHT_LEN = sizeof(LIGHT_SCHEME)/sizeof(LIGHT_SCHEME[0]);

void ListenReaderField(int limit) {
#define LF_ONLY						1
#define HF_ONLY						2
#define REPORT_CHANGE			 	10    // report new values only if they have changed at least by REPORT_CHANGE

	uint16_t lf_av, lf_av_new, lf_baseline = 0, lf_max;
	uint16_t hf_av, hf_av_new,  hf_baseline = 0, hf_max;
	uint16_t mode = 1, display_val, display_max, i;

	// switch off FPGA - we don't want to measure our own signal
	// 20180315 - iceman,  why load this before and then turn off?
	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

	LEDsoff();

	lf_av = lf_max = AvgAdc(ADC_CHAN_LF);

	if (limit != HF_ONLY) {
		Dbprintf("LF 125/134kHz Baseline: %dmV", (MAX_ADC_LF_VOLTAGE * lf_av) >> 10);
		lf_baseline = lf_av;
	}

	hf_av = hf_max = AvgAdc(ADC_CHAN_HF);

	// iceman,  useless,  since we are measuring readerfield,  not our field.  My tests shows a max of 20v from a reader.
	// RDV40 will hit the roof, try other ADC channel used in that hardware revision.
	bool use_high = ( ((MAX_ADC_HF_VOLTAGE * hf_max) >> 10) > MAX_ADC_HF_VOLTAGE-300 );
	if ( use_high ) {
		hf_av = hf_max = AvgAdc(ADC_CHAN_HF_RDV40);
	}

	if (limit != LF_ONLY) {
		Dbprintf("HF 13.56MHz Baseline: %dmV", (MAX_ADC_HF_VOLTAGE * hf_av) >> 10);
		hf_baseline = hf_av;
	}

	for(;;) {
		// Switch modes with button
		if (BUTTON_PRESS()) {
			SpinDelay(500);
			switch (mode) {
				case 1:
					mode = 2;
					DbpString("Signal Strength Mode");
					break;
				case 2:
				default:
					DbpString("Stopped");
					LEDsoff();
					return;
					break;
			}
		}
		WDT_HIT();

		if (limit != HF_ONLY) {
			if(mode == 1) {
				if (ABS(lf_av - lf_baseline) > REPORT_CHANGE)
					LED_D_ON();
				else
					LED_D_OFF();
			}

			lf_av_new = AvgAdc(ADC_CHAN_LF);
			// see if there's a significant change
			if (ABS(lf_av - lf_av_new) > REPORT_CHANGE) {
				Dbprintf("LF 125/134kHz Field Change: %5dmV", (MAX_ADC_LF_VOLTAGE * lf_av_new) >> 10);
				lf_av = lf_av_new;
				if (lf_av > lf_max)
					lf_max = lf_av;
			}
		}

		if (limit != LF_ONLY) {
			if (mode == 1){
				if (ABS(hf_av - hf_baseline) > REPORT_CHANGE)
					LED_B_ON();
				else
					LED_B_OFF();
			}

			hf_av_new = (use_high) ? AvgAdc(ADC_CHAN_HF_RDV40) :  AvgAdc(ADC_CHAN_HF);

			// see if there's a significant change
			if(ABS(hf_av - hf_av_new) > REPORT_CHANGE) {
				Dbprintf("HF 13.56MHz Field Change: %5dmV", (MAX_ADC_HF_VOLTAGE * hf_av_new) >> 10);
				hf_av = hf_av_new;
				if (hf_av > hf_max)
					hf_max = hf_av;
			}
		}

		if (mode == 2) {
			if (limit == LF_ONLY) {
				display_val = lf_av;
				display_max = lf_max;
			} else if (limit == HF_ONLY) {
				display_val = hf_av;
				display_max = hf_max;
			} else { /* Pick one at random */
				if( (hf_max - hf_baseline) > (lf_max - lf_baseline) ) {
					display_val = hf_av;
					display_max = hf_max;
				} else {
					display_val = lf_av;
					display_max = lf_max;
				}
			}
			for (i=0; i<LIGHT_LEN; i++) {
				if (display_val >= ((display_max/LIGHT_LEN)*i) && display_val <= ((display_max/LIGHT_LEN)*(i+1))) {
					if (LIGHT_SCHEME[i] & 0x1) LED_C_ON(); else LED_C_OFF();
					if (LIGHT_SCHEME[i] & 0x2) LED_A_ON(); else LED_A_OFF();
					if (LIGHT_SCHEME[i] & 0x4) LED_B_ON(); else LED_B_OFF();
					if (LIGHT_SCHEME[i] & 0x8) LED_D_ON(); else LED_D_OFF();
					break;
				}
			}
		}
	}
}

void UsbPacketReceived(uint8_t *packet, int len) {
	UsbCommand *c = (UsbCommand *)packet;

	//Dbprintf("received %d bytes, with command: 0x%04x and args: %d %d %d", len, c->cmd, c->arg[0], c->arg[1], c->arg[2]);

	switch(c->cmd) {
#ifdef WITH_LF
		case CMD_SET_LF_T55XX_CONFIG:
			setT55xxConfig( c->arg[0], (t55xx_config *) c->d.asBytes);
			break;
		case CMD_SET_LF_SAMPLING_CONFIG:
			setSamplingConfig((sample_config *) c->d.asBytes);
			break;
		case CMD_ACQUIRE_RAW_ADC_SAMPLES_125K: {
			uint32_t bits = SampleLF(c->arg[0], c->arg[1]);
			cmd_send(CMD_ACK, bits, 0, 0, 0, 0);
			break;
		}
		case CMD_MOD_THEN_ACQUIRE_RAW_ADC_SAMPLES_125K:
			ModThenAcquireRawAdcSamples125k(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_LF_SNOOP_RAW_ADC_SAMPLES: {
			uint32_t bits = SnoopLF();
			cmd_send(CMD_ACK, bits, 0, 0, 0, 0);
			break;
		}
		case CMD_HID_DEMOD_FSK: {
			uint32_t high, low;
			CmdHIDdemodFSK(c->arg[0], &high, &low, 1);
			break;
		}
		case CMD_HID_SIM_TAG:
			CmdHIDsimTAG(c->arg[0], c->arg[1], 1);
			break;
		case CMD_FSK_SIM_TAG:
			CmdFSKsimTAG(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_ASK_SIM_TAG:
			CmdASKsimTag(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_PSK_SIM_TAG:
			CmdPSKsimTag(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_HID_CLONE_TAG:
			CopyHIDtoT55x7(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes[0]);
			break;
		case CMD_IO_DEMOD_FSK: {
			uint32_t high, low;
			CmdIOdemodFSK(c->arg[0], &high, &low, 1);
			break;
		}
		case CMD_IO_CLONE_TAG:
			CopyIOtoT55x7(c->arg[0], c->arg[1]);
			break;
		case CMD_EM410X_DEMOD: {
			uint32_t high;
			uint64_t low;
			CmdEM410xdemod(c->arg[0], &high, &low, 1);
			break;
		}
		case CMD_EM410X_WRITE_TAG:
			WriteEM410x(c->arg[0], c->arg[1], c->arg[2]);
			break;
		case CMD_READ_TI_TYPE:
			ReadTItag();
			break;
		case CMD_WRITE_TI_TYPE:
			WriteTItag(c->arg[0],c->arg[1],c->arg[2]);
			break;
		case CMD_SIMULATE_TAG_125K:
			LED_A_ON();
			SimulateTagLowFrequency(c->arg[0], c->arg[1], 1);
			LED_A_OFF();
			break;
		case CMD_LF_SIMULATE_BIDIR:
			SimulateTagLowFrequencyBidir(c->arg[0], c->arg[1]);
			break;
		case CMD_INDALA_CLONE_TAG:
			CopyIndala64toT55x7(c->arg[0], c->arg[1]);
			break;
		case CMD_INDALA_CLONE_TAG_L:
			CopyIndala224toT55x7(
				c->d.asDwords[0], c->d.asDwords[1], c->d.asDwords[2], c->d.asDwords[3],
				c->d.asDwords[4], c->d.asDwords[5], c->d.asDwords[6]
				);
			break;
		case CMD_T55XX_READ_BLOCK: {
			T55xxReadBlock(c->arg[0], c->arg[1], c->arg[2]);
			break;
		}
		case CMD_T55XX_WRITE_BLOCK:
			T55xxWriteBlock(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes[0]);
			break;
		case CMD_T55XX_WAKEUP:
			T55xxWakeUp(c->arg[0]);
			break;
		case CMD_T55XX_RESET_READ:
			T55xxResetRead();
			break;
		case CMD_T55XX_CHKPWDS:
			T55xx_ChkPwds();
			break;
		case CMD_PCF7931_READ:
			ReadPCF7931();
			break;
		case CMD_PCF7931_WRITE:
			WritePCF7931(
				c->d.asBytes[0], c->d.asBytes[1], c->d.asBytes[2], c->d.asBytes[3],
				c->d.asBytes[4], c->d.asBytes[5], c->d.asBytes[6], c->d.asBytes[9],
                c->d.asBytes[7] - 128, c->d.asBytes[8] - 128,
				c->arg[0],
				c->arg[1],
				c->arg[2]
				);
			break;
		case CMD_EM4X_READ_WORD:
			EM4xReadWord(c->arg[0], c->arg[1], c->arg[2]);
			break;
		case CMD_EM4X_WRITE_WORD:
			EM4xWriteWord(c->arg[0], c->arg[1], c->arg[2]);
			break;
		case CMD_AWID_DEMOD_FSK:  {
			uint32_t high, low;
			// Set realtime AWID demodulation
			CmdAWIDdemodFSK(c->arg[0], &high, &low, 1);
			break;
		}
        case CMD_VIKING_CLONE_TAG:
			CopyVikingtoT55xx(c->arg[0], c->arg[1], c->arg[2]);
            break;
		case CMD_COTAG:
			Cotag(c->arg[0]);
			break;
#endif

#ifdef WITH_HITAG
		case CMD_SNOOP_HITAG: // Eavesdrop Hitag tag, args = type
			SnoopHitag(c->arg[0]);
			break;
		case CMD_SIMULATE_HITAG: // Simulate Hitag tag, args = memory content
			SimulateHitagTag((bool)c->arg[0],(byte_t*)c->d.asBytes);
			break;
		case CMD_READER_HITAG: // Reader for Hitag tags, args = type and function
			ReaderHitag((hitag_function)c->arg[0],(hitag_data*)c->d.asBytes);
			break;
		case CMD_SIMULATE_HITAG_S:// Simulate Hitag s tag, args = memory content
			SimulateHitagSTag((bool)c->arg[0],(byte_t*)c->d.asBytes);
			break;
		case CMD_TEST_HITAGS_TRACES:// Tests every challenge within the given file
			check_challenges((bool)c->arg[0],(byte_t*)c->d.asBytes);
			break;
		case CMD_READ_HITAG_S: //Reader for only Hitag S tags, args = key or challenge
			ReadHitagS((hitag_function)c->arg[0],(hitag_data*)c->d.asBytes);
			break;
		case CMD_WR_HITAG_S: //writer for Hitag tags args=data to write,page and key or challenge
			if ((hitag_function)c->arg[0] < 10) {
				WritePageHitagS((hitag_function)c->arg[0],(hitag_data*)c->d.asBytes,c->arg[2]);
			} else if ((hitag_function)c->arg[0] >= 10) {
			  WriterHitag((hitag_function)c->arg[0],(hitag_data*)c->d.asBytes, c->arg[2]);
			}
			break;
#endif

#ifdef WITH_ISO15693
		case CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_15693:
			AcquireRawAdcSamplesIso15693();
			break;
		case CMD_RECORD_RAW_ADC_SAMPLES_ISO_15693:
			RecordRawAdcSamplesIso15693();
			break;
		case CMD_ISO_15693_COMMAND:
			DirectTag15693Command(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_ISO_15693_FIND_AFI:
			BruteforceIso15693Afi(c->arg[0]);
			break;
		case CMD_READER_ISO_15693:
			ReaderIso15693(c->arg[0]);
			break;
		case CMD_SIMTAG_ISO_15693:
			SimTagIso15693(c->arg[0], c->d.asBytes);
			break;
#endif

#ifdef WITH_LEGICRF
		case CMD_SIMULATE_TAG_LEGIC_RF:
			LegicRfSimulate(c->arg[0]);
			break;
		case CMD_WRITER_LEGIC_RF:
			LegicRfWriter(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_READER_LEGIC_RF:
			LegicRfReader(c->arg[0], c->arg[1], c->arg[2]);
			break;
		case CMD_LEGIC_INFO:
			LegicRfInfo();
			break;
		case CMD_LEGIC_ESET:
			//-----------------------------------------------------------------------------
			// Note: we call FpgaDownloadAndGo(FPGA_BITSTREAM_HF) here although FPGA is not
			// involved in dealing with emulator memory. But if it is called later, it might
			// destroy the Emulator Memory.
			//-----------------------------------------------------------------------------
			// arg0 = offset
			// arg1 = num of bytes
			FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
			emlSet(c->d.asBytes, c->arg[0], c->arg[1]);
			break;
#endif

#ifdef WITH_ISO14443b
		case CMD_READ_SRI_TAG:
			ReadSTMemoryIso14443b(c->arg[0]);
			break;
		case CMD_SNOOP_ISO_14443B:
			SniffIso14443b();
			break;
		case CMD_SIMULATE_TAG_ISO_14443B:
			SimulateIso14443bTag(c->arg[0]);
			break;
		case CMD_ISO_14443B_COMMAND:
			//SendRawCommand14443B(c->arg[0],c->arg[1],c->arg[2],c->d.asBytes);
			SendRawCommand14443B_Ex(c);
			break;
#endif

#ifdef WITH_FELICA
		case CMD_FELICA_COMMAND:
			felica_sendraw(c);
			break;
        case CMD_FELICA_LITE_SIM:
            felica_sim_lite(c->arg[0]);
            break;
        case CMD_FELICA_SNOOP:
            felica_sniff(c->arg[0], c->arg[1]);
            break;
        case CMD_FELICA_LITE_DUMP:
			felica_dump_lite_s();
            break;
#endif

#ifdef WITH_ISO14443a
		case CMD_SNOOP_ISO_14443a:
			SniffIso14443a(c->arg[0]);
			break;
		case CMD_READER_ISO_14443a:
			ReaderIso14443a(c);
			break;
		case CMD_SIMULATE_TAG_ISO_14443a:
			SimulateIso14443aTag(c->arg[0], c->arg[1], c->d.asBytes);  // ## Simulate iso14443a tag - pass tag type & UID
			break;
		case CMD_ANTIFUZZ_ISO_14443a:
			iso14443a_antifuzz(c->arg[0]);
			break;
		case CMD_EPA_PACE_COLLECT_NONCE:
			EPA_PACE_Collect_Nonce(c);
			break;
		case CMD_EPA_PACE_REPLAY:
			EPA_PACE_Replay(c);
			break;
		case CMD_READER_MIFARE:
            ReaderMifare(c->arg[0], c->arg[1], c->arg[2]);
			break;
		case CMD_MIFARE_READBL:
			MifareReadBlock(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFAREU_READBL:
			MifareUReadBlock(c->arg[0],c->arg[1], c->d.asBytes);
			break;
		case CMD_MIFAREUC_AUTH:
			MifareUC_Auth(c->arg[0],c->d.asBytes);
			break;
		case CMD_MIFAREU_READCARD:
			MifareUReadCard(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFAREUC_SETPWD:
			MifareUSetPwd(c->arg[0], c->d.asBytes);
			break;
		case CMD_MIFARE_READSC:
			MifareReadSector(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_WRITEBL:
			MifareWriteBlock(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		//case CMD_MIFAREU_WRITEBL_COMPAT:
			//MifareUWriteBlockCompat(c->arg[0], c->d.asBytes);
			//break;
		case CMD_MIFAREU_WRITEBL:
			MifareUWriteBlock(c->arg[0], c->arg[1], c->d.asBytes);
			break;
		case CMD_MIFARE_ACQUIRE_ENCRYPTED_NONCES:
			MifareAcquireEncryptedNonces(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_ACQUIRE_NONCES:
			MifareAcquireNonces(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_NESTED:
			MifareNested(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_CHKKEYS: {
			MifareChkKeys(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		}
		case CMD_MIFARE_CHKKEYS_FAST: {
			MifareChkKeys_fast(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		}
		case CMD_SIMULATE_MIFARE_CARD:
			Mifare1ksim(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;

		// emulator
		case CMD_MIFARE_SET_DBGMODE:
			MifareSetDbgLvl(c->arg[0]);
			break;
		case CMD_MIFARE_EML_MEMCLR:
			MifareEMemClr(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_EML_MEMSET:
			MifareEMemSet(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_EML_MEMGET:
			MifareEMemGet(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_EML_CARDLOAD:
			MifareECardLoad(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;

		// Work with "magic Chinese" card
		case CMD_MIFARE_CSETBLOCK:
			MifareCSetBlock(c->arg[0], c->arg[1], c->d.asBytes);
			break;
		case CMD_MIFARE_CGETBLOCK:
			MifareCGetBlock(c->arg[0], c->arg[1], c->d.asBytes);
			break;
		case CMD_MIFARE_CIDENT:
			MifareCIdent();
			break;
		// mifare sniffer
//		case CMD_MIFARE_SNIFFER:
			//SniffMifare(c->arg[0]);
//			break;
		case CMD_MIFARE_SETMOD:
			MifareSetMod(c->arg[0], c->d.asBytes);
			break;
		//mifare desfire
		case CMD_MIFARE_DESFIRE_READBL:
			break;
		case CMD_MIFARE_DESFIRE_WRITEBL:
			break;
		case CMD_MIFARE_DESFIRE_AUTH1:
			MifareDES_Auth1(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_MIFARE_DESFIRE_AUTH2:
			//MifareDES_Auth2(c->arg[0],c->d.asBytes);
			break;
		case CMD_MIFARE_DES_READER:
			//readermifaredes(c->arg[0], c->arg[1], c->d.asBytes);
			break;
		case CMD_MIFARE_DESFIRE_INFO:
			MifareDesfireGetInformation();
			break;
		case CMD_MIFARE_DESFIRE:
			MifareSendCommand(c->arg[0], c->arg[1], c->d.asBytes);
			break;
		case CMD_MIFARE_COLLECT_NONCES:
			break;
		case CMD_MIFARE_NACK_DETECT:
			DetectNACKbug();
			break;
#endif

#ifdef WITH_ICLASS
		// Makes use of ISO14443a FPGA Firmware
		case CMD_SNOOP_ICLASS:
			SniffIClass();
			break;
		case CMD_SIMULATE_TAG_ICLASS:
			SimulateIClass(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
			break;
		case CMD_READER_ICLASS:
			ReaderIClass(c->arg[0]);
			break;
		case CMD_READER_ICLASS_REPLAY:
		    ReaderIClass_Replay(c->arg[0], c->d.asBytes);
			break;
		case CMD_ICLASS_EML_MEMSET:
			//iceman, should call FPGADOWNLOAD before, since it corrupts BigBuf
			FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
			emlSet(c->d.asBytes, c->arg[0], c->arg[1]);
			break;
		case CMD_ICLASS_WRITEBLOCK:
			iClass_WriteBlock(c->arg[0], c->d.asBytes);
			break;
		case CMD_ICLASS_READCHECK:  // auth step 1
			iClass_ReadCheck(c->arg[0], c->arg[1]);
			break;
		case CMD_ICLASS_READBLOCK:
			iClass_ReadBlk(c->arg[0]);
			break;
		case CMD_ICLASS_AUTHENTICATION: //check
			iClass_Authentication(c->d.asBytes);
			break;
		case CMD_ICLASS_CHECK_KEYS:
			iClass_Authentication_fast(c->arg[0], c->arg[1], c->d.asBytes);
			break;
		case CMD_ICLASS_DUMP:
			iClass_Dump(c->arg[0], c->arg[1]);
			break;
		case CMD_ICLASS_CLONE:
			iClass_Clone(c->arg[0], c->arg[1], c->d.asBytes);
			break;
#endif

#ifdef WITH_HFSNOOP
		case CMD_HF_SNIFFER:
			HfSnoop(c->arg[0], c->arg[1]);
			break;
#endif

#ifdef WITH_SMARTCARD
		case CMD_SMART_ATR: {
			SmartCardAtr();
			break;
		}
		case CMD_SMART_SETBAUD:{
			SmartCardSetBaud(c->arg[0]);
			break;
		}
		case CMD_SMART_SETCLOCK:{
			SmartCardSetClock(c->arg[0]);
			break;
		}
        case CMD_SMART_RAW: {
			SmartCardRaw(c->arg[0], c->arg[1], c->d.asBytes);
            break;
        }
		case CMD_SMART_UPLOAD: {
			// upload file from client
			uint8_t *mem = BigBuf_get_addr();
			memcpy( mem + c->arg[0], c->d.asBytes, USB_CMD_DATA_SIZE);
			cmd_send(CMD_ACK,1,0,0,0,0);
			break;
		}
        case CMD_SMART_UPGRADE: {
			SmartCardUpgrade(c->arg[0]);
            break;
		}
#endif

#ifdef WITH_FPC
		case CMD_FPC_SEND: {


			StartTicks();
			DbpString("Mutual USB/FPC sending from device to client");

			/*
			char at[11] = {'\0'};
			static const char* s_at = "AT+BAUD8\0D\0A";
			strncat(at, s_at, sizeof(at) - strlen(at) - 1);
			DbpString("Try AT baud rate setting");
			usart_init();
			int16_t res = usart_writebuffer((uint8_t*)&at, sizeof(at));
			WaitMS(1);
			Dbprintf("SEND %d | %c%c%c%c%c%c%c%c%c%c%c", res,  at[0], at[1], at[2], at[3], at[4], at[5], at[6], at[7], at[8], at[9], at[10]);

			uint8_t my_rx[20];
			memset(my_rx, 0, sizeof(my_rx));
			res = usart_readbuffer(my_rx, sizeof(my_rx));
			WaitMS(1);
			Dbprintf("GOT  %d | %c%c%c%c%c%c%c%c", res,  my_rx[0], my_rx[1], my_rx[2], my_rx[3], my_rx[4], my_rx[5], my_rx[6], my_rx[7]);
			*/


			char dest[USB_CMD_DATA_SIZE] = { '\0' };
			static const char* welcome = "Proxmark3 Serial interface via FPC ready\n";
			strncat(dest, welcome, sizeof(dest) - strlen(dest) - 1);
			sprintf(dest + strlen(dest) - 1, "| bytes 0x%02x 0x%02x 0x%02x 0x%02x \n"
						, c->d.asBytes[0]
						, c->d.asBytes[1]
						, c->d.asBytes[2]
						, c->d.asBytes[3]
						);

			UsbCommand txcmd = { CMD_DEBUG_PRINT_STRING, { strlen(dest), 0, 0 } };
			memcpy(txcmd.d.asBytes, dest, sizeof(dest));

			LED_A_ON();

			usart_init();
			usart_writebuffer((uint8_t*)&txcmd, sizeof(UsbCommand));

			//usb
			cmd_send(CMD_DEBUG_PRINT_STRING, strlen(dest), 0, 0, dest, strlen(dest));
			LED_A_OFF();


			/*
			uint8_t my_rx[sizeof(UsbCommand)];
			while (!BUTTON_PRESS() && !usb_poll_validate_length()) {
				LED_B_INV();
				if (usart_readbuffer(my_rx, sizeof(UsbCommand)) ) {
					//UsbPacketReceived(my_rx, sizeof(my_rx));

					UsbCommand *my = (UsbCommand *)my_rx;
					if (mc->cmd > 0 ) {
						Dbprintf("received command: 0x%04x and args: %d %d %d", my->cmd, my->arg[0], my->arg[1], my->arg[2]);
					}
				}
			}
			*/

			//cmd_send(CMD_DEBUG_PRINT_STRING, strlen(dest), 0, 0, dest, strlen(dest));

			cmd_send(CMD_ACK,0,0,0,0,0);
			StopTicks();
			break;
		}
#endif
		case CMD_BUFF_CLEAR:
			BigBuf_Clear();
			BigBuf_free();
			break;

		case CMD_MEASURE_ANTENNA_TUNING:
			MeasureAntennaTuning();
			break;

		case CMD_MEASURE_ANTENNA_TUNING_HF:
			MeasureAntennaTuningHf();
			break;

		case CMD_LISTEN_READER_FIELD:
			ListenReaderField(c->arg[0]);
			break;

		case CMD_FPGA_MAJOR_MODE_OFF:		// ## FPGA Control
			FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
			SpinDelay(200);
			LED_D_OFF(); // LED D indicates field ON or OFF
			break;
#ifdef WITH_LF
		case CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K: {
			LED_B_ON();
			uint8_t *mem = BigBuf_get_addr();
			bool isok = false;
			size_t len = 0;
			uint32_t startidx = c->arg[0];
			uint32_t numofbytes = c->arg[1];
			// arg0 = startindex
			// arg1 = length bytes to transfer
			// arg2 = BigBuf tracelen
			//Dbprintf("transfer to client parameters: %" PRIu32 " | %" PRIu32 " | %" PRIu32, startidx, numofbytes, c->arg[2]);

			for(size_t i = 0; i < numofbytes; i += USB_CMD_DATA_SIZE) {
				len = MIN( (numofbytes - i), USB_CMD_DATA_SIZE);
				isok = cmd_send(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, i, len, BigBuf_get_traceLen(), mem + startidx + i, len);
				if (isok != 0)
					Dbprintf("transfer to client failed ::  | bytes between %d - %d (%d)", i, i+len, len);
			}
			// Trigger a finish downloading signal with an ACK frame
			// iceman,  when did sending samplingconfig array got attached here?!?
			// arg0 = status of download transfer
			// arg1 = RFU
			// arg2 = tracelen?
			// asbytes = samplingconfig array
			cmd_send(CMD_ACK, 1, 0, BigBuf_get_traceLen(), getSamplingConfig(), sizeof(sample_config));
			LED_B_OFF();
			break;
		}
#endif
		case CMD_UPLOAD_SIM_SAMPLES_125K: {
			// iceman; since changing fpga_bitstreams clears bigbuff, Its better to call it before.
			// to be able to use this one for uploading data to device
			// arg1 = 0 upload for LF usage
			//        1 upload for HF usage
			#define FPGA_LF 1
			if ( c->arg[1] == FPGA_LF )
				FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
			else
				FpgaDownloadAndGo(FPGA_BITSTREAM_HF);

			uint8_t *mem = BigBuf_get_addr();
			memcpy( mem + c->arg[0], c->d.asBytes, USB_CMD_DATA_SIZE);
			cmd_send(CMD_ACK,1,0,0,0,0);
			break;
		}
		case CMD_DOWNLOAD_EML_BIGBUF: {
			LED_B_ON();
			uint8_t *mem = BigBuf_get_EM_addr();
			bool isok = false;
			size_t len = 0;
			uint32_t startidx = c->arg[0];
			uint32_t numofbytes = c->arg[1];

			// arg0 = startindex
			// arg1 = length bytes to transfer
			// arg2 = RFU

			for (size_t i = 0; i < numofbytes; i += USB_CMD_DATA_SIZE) {
				len = MIN((numofbytes - i), USB_CMD_DATA_SIZE);
				isok = cmd_send(CMD_DOWNLOADED_EML_BIGBUF, i, len, 0, mem + startidx + i, len);
				if (isok != 0)
					Dbprintf("transfer to client failed ::  | bytes between %d - %d (%d)", i, i+len, len);
			}
			// Trigger a finish downloading signal with an ACK frame
			cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
			LED_B_OFF();
			break;
		}
		case CMD_READ_MEM:
			ReadMem(c->arg[0]);
			break;
#ifdef WITH_FLASH
		case CMD_FLASHMEM_SET_SPIBAUDRATE:
			FlashmemSetSpiBaudrate(c->arg[0]);
			break;
		case CMD_FLASHMEM_READ: {
			LED_B_ON();
			uint16_t isok = 0;
			uint32_t startidx = c->arg[0];
			uint16_t len = c->arg[1];

			Dbprintf("FlashMem read | %d - %d | ", startidx, len);

			size_t size = MIN(USB_CMD_DATA_SIZE, len);

			if (!FlashInit()) {
   		       break;
  		    }

			uint8_t *mem = BigBuf_malloc(size);

			for(size_t i = 0; i < len; i += size) {
				len = MIN((len - i), size);

				Dbprintf("FlashMem reading  | %d | %d | %d |", startidx + i, i, len);
				isok = Flash_ReadDataCont(startidx + i, mem, len);
				if ( isok == len ) {
					print_result("Chunk: ", mem, len);
				} else {
					Dbprintf("FlashMem reading failed | %d | %d", len, isok);
					break;
				}
			}
			BigBuf_free();
			FlashStop();
			LED_B_OFF();
			break;
		}
		case CMD_FLASHMEM_WRITE: {
			LED_B_ON();
			uint8_t isok = 0;
			uint16_t res = 0;
			uint32_t startidx = c->arg[0];
			uint16_t len = c->arg[1];
			uint8_t* data = c->d.asBytes;

			uint32_t tmp = startidx + len;

  			if (!FlashInit()) {
   		       break;
  		    }

  		    Flash_CheckBusy(BUSY_TIMEOUT);
  		    Flash_WriteEnable();

			if ( startidx == DEFAULT_T55XX_KEYS_OFFSET  )
				Flash_Erase4k(3, 0xC);
			else if (startidx ==  DEFAULT_MF_KEYS_OFFSET )
				Flash_Erase4k(3, 0xB);
			else if (startidx == DEFAULT_ICLASS_KEYS_OFFSET)
				Flash_Erase4k(3, 0xA);

  		    Flash_CheckBusy(BUSY_TIMEOUT);
  		    Flash_WriteEnable();

			// inside 256b page?
			if ( (tmp & 0xFF) != 0) {

					// is offset+len larger than a page
					tmp =  (startidx & 0xFF ) + len;
					if (tmp > 0xFF ) {

						// data spread over two pages.

						// offset xxxx10,
						uint8_t first_len =  (~startidx & 0xFF)+1;

						// first mem page
						res = Flash_WriteDataCont(startidx, data, first_len);

						// second mem page
						res = Flash_WriteDataCont(startidx + first_len, data + first_len, len - first_len);

						isok = (res == (len - first_len)) ? 1 : 0;

					} else {
						res = Flash_WriteDataCont(startidx, data, len);
						isok = (res == len) ? 1 : 0;
					}
			} else {
				res = Flash_WriteDataCont(startidx, data, len);
				isok = (res == len) ? 1 : 0;
			}
  		    FlashStop();

			cmd_send(CMD_ACK, isok, 0, 0, 0, 0);
			LED_B_OFF();
			break;
		}
		case CMD_FLASHMEM_WIPE: {
			LED_B_ON();
			uint8_t page = c->arg[0];
			uint8_t initalwipe = c->arg[1];
			bool isok = false;
			if ( initalwipe ) {
				isok = Flash_WipeMemory();
				cmd_send(CMD_ACK, isok, 0, 0, 0, 0);
				LED_B_OFF();
				break;
			}
			if ( page < 3)
				isok = Flash_WipeMemoryPage(page);

			cmd_send(CMD_ACK, isok, 0, 0, 0, 0);
			LED_B_OFF();
			break;
		}
		case CMD_FLASHMEM_DOWNLOAD: {

			LED_B_ON();
			uint8_t *mem = BigBuf_malloc(USB_CMD_DATA_SIZE);
			bool isok = false;
			size_t len = 0;
			uint32_t startidx = c->arg[0];
			uint32_t numofbytes = c->arg[1];
			// arg0 = startindex
			// arg1 = length bytes to transfer
			// arg2 = RFU

  			if (!FlashInit()) {
   		       break;
  		    }

			for (size_t i = 0; i < numofbytes; i += USB_CMD_DATA_SIZE) {
				len = MIN((numofbytes - i), USB_CMD_DATA_SIZE);

				isok = Flash_ReadDataCont(startidx + i, mem, len);
				if (!isok )
					Dbprintf("reading flash memory failed ::  | bytes between %d - %d", i, len);

				isok = cmd_send(CMD_FLASHMEM_DOWNLOADED, i, len, 0, mem, len);
				if (isok != 0)
					Dbprintf("transfer to client failed ::  | bytes between %d - %d", i, len);
			}
				FlashStop();

			cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
			LED_B_OFF();
			break;
		}
		case CMD_FLASHMEM_INFO: {

			LED_B_ON();
			rdv40_validation_t *info = (rdv40_validation_t*)BigBuf_malloc( sizeof(rdv40_validation_t) );

			bool isok = Flash_ReadData(FLASH_MEM_SIGNATURE_OFFSET, info->signature, FLASH_MEM_SIGNATURE_LEN);

			if (FlashInit()) {
				Flash_UniqueID( info->flashid);
				FlashStop();
			}
			cmd_send(CMD_ACK, isok, 0, 0, info, sizeof(rdv40_validation_t));
			BigBuf_free();

			LED_B_OFF();
			break;
		}
#endif
		case CMD_SET_LF_DIVISOR:
		  	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
			FpgaSendCommand(FPGA_CMD_SET_DIVISOR, c->arg[0]);
			break;

		case CMD_SET_ADC_MUX:
			switch(c->arg[0]) {
				case 0: SetAdcMuxFor(GPIO_MUXSEL_LOPKD); break;
				case 2: SetAdcMuxFor(GPIO_MUXSEL_HIPKD); break;
#ifndef WITH_FPC
				case 1: SetAdcMuxFor(GPIO_MUXSEL_LORAW); break;
				case 3: SetAdcMuxFor(GPIO_MUXSEL_HIRAW); break;
#endif
				}
			break;

		case CMD_VERSION:
			SendVersion();
			break;
		case CMD_STATUS:
			SendStatus();
			break;
		case CMD_PING:
			cmd_send(CMD_ACK,0,0,0,0,0);
			break;
#ifdef WITH_LCD
		case CMD_LCD_RESET:
			LCDReset();
			break;
		case CMD_LCD:
			LCDSend(c->arg[0]);
			break;
#endif
		case CMD_SETUP_WRITE:
		case CMD_FINISH_WRITE:
		case CMD_HARDWARE_RESET:
			usb_disable();

			// (iceman) why this wait?
			SpinDelay(1000);
			AT91C_BASE_RSTC->RSTC_RCR = RST_CONTROL_KEY | AT91C_RSTC_PROCRST;
			// We're going to reset, and the bootrom will take control.
			for(;;) {}
			break;

		case CMD_START_FLASH:
			if(common_area.flags.bootrom_present) {
				common_area.command = COMMON_AREA_COMMAND_ENTER_FLASH_MODE;
			}
			usb_disable();
			AT91C_BASE_RSTC->RSTC_RCR = RST_CONTROL_KEY | AT91C_RSTC_PROCRST;
			// We're going to flash, and the bootrom will take control.
			for(;;) {}
			break;

		case CMD_DEVICE_INFO: {
			uint32_t dev_info = DEVICE_INFO_FLAG_OSIMAGE_PRESENT | DEVICE_INFO_FLAG_CURRENT_MODE_OS;
			if (common_area.flags.bootrom_present) {
				dev_info |= DEVICE_INFO_FLAG_BOOTROM_PRESENT;
			}
			cmd_send(CMD_DEVICE_INFO,dev_info,0,0,0,0);
			break;
			}
		default:
			Dbprintf("%s: 0x%04x","unknown command:", c->cmd);
			break;
	}
}

void  __attribute__((noreturn)) AppMain(void) {

	SpinDelay(100);
	clear_trace();

	if(common_area.magic != COMMON_AREA_MAGIC || common_area.version != 1) {
		/* Initialize common area */
		memset(&common_area, 0, sizeof(common_area));
		common_area.magic = COMMON_AREA_MAGIC;
		common_area.version = 1;
	}
	common_area.flags.osimage_present = 1;

	LEDsoff();

	// The FPGA gets its clock from us from PCK0 output, so set that up.
	AT91C_BASE_PIOA->PIO_BSR = GPIO_PCK0;
	AT91C_BASE_PIOA->PIO_PDR = GPIO_PCK0;
	AT91C_BASE_PMC->PMC_SCER |= AT91C_PMC_PCK0;
	// PCK0 is PLL clock / 4 = 96Mhz / 4 = 24Mhz
	AT91C_BASE_PMC->PMC_PCKR[0] = AT91C_PMC_CSS_PLL_CLK | AT91C_PMC_PRES_CLK_4; //  4 for 24Mhz pck0, 2 for 48 MHZ pck0
	AT91C_BASE_PIOA->PIO_OER = GPIO_PCK0;

	// Reset SPI
	AT91C_BASE_SPI->SPI_CR = AT91C_SPI_SWRST;
	AT91C_BASE_SPI->SPI_CR = AT91C_SPI_SWRST; // errata says it needs twice to be correctly set.

	// Reset SSC
	AT91C_BASE_SSC->SSC_CR = AT91C_SSC_SWRST;

	// Configure MUX
	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);

	// Load the FPGA image, which we have stored in our flash.
	// (the HF version by default)
	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);

	StartTickCount();

#ifdef WITH_LCD
	LCDInit();
#endif

#ifdef WITH_SMARTCARD
	I2C_init();
#endif

#ifdef WITH_FPC
	usart_init();
#endif

#ifdef WITH_FLASH
	loadT55xxConfig();
#endif

	// This is made as late as possible to ensure enumeration without timeout
	// against device such as http://www.hobbytronics.co.uk/usb-host-board-v2
	usb_disable();
	usb_enable();

	uint8_t rx[sizeof(UsbCommand)];

	for(;;) {
		WDT_HIT();

		// Check if there is a usb packet available
		if (usb_poll_validate_length()) {
			if (usb_read(rx, sizeof(rx)) )
				UsbPacketReceived(rx, sizeof(rx));
		}
#ifdef WITH_FPC
		// Check is there is FPC package available
		/*
		usart_init();
		if (usart_readbuffer(rx, sizeof(rx)) )
			UsbPacketReceived(rx, sizeof(rx) );
		*/

#endif

		// Press button for one second to enter a possible standalone mode
		if (BUTTON_HELD(1000) > 0) {

/*
* So this is the trigger to execute a standalone mod.  Generic entrypoint by following the standalone/standalone.h headerfile
* All standalone mod "main loop" should be the RunMod() function.
* Since the standalone is either LF or HF, the somewhat bisarr defines below exists.
*/
#if defined (WITH_LF) && ( defined (WITH_LF_SAMYRUN) || defined (WITH_LF_HIDBRUTE) || defined (WITH_LF_PROXBRUTE) )
			RunMod();
#endif

#if defined (WITH_ISO14443a) && ( defined (WITH_HF_YOUNG) || defined(WITH_HF_COLIN) || defined(WITH_HF_MATTYRUN) || defined(WITH_HF_BOG) )
			RunMod();
#endif

		}
	}
}