[proxmark3-svn] / armsrc / pcf7931.c

#include "proxmark3.h"
#include "apps.h"
#include "lfsampling.h"
#include "pcf7931.h"
#include "string.h"

#define T0_PCF 8 //period for the pcf7931 in us
#define ALLOC 16

#define abs(x) ( ((x)<0) ? -(x) : (x) )
#define max(x,y) ( x<y ? y:x)

int DemodPCF7931(uint8_t **outBlocks) {

    uint8_t bits[256] = {0x00};
	uint8_t blocks[8][16];
    uint8_t *dest = BigBuf_get_addr();
    
	int GraphTraceLen = BigBuf_max_traceLen();
	if (  GraphTraceLen > 18000 )
		GraphTraceLen = 18000;
	
	
	int i, j, lastval, bitidx, half_switch;
	int clock = 64;
	int tolerance = clock / 8;
	int pmc, block_done;
	int lc, warnings = 0;
	int num_blocks = 0;
	int lmin=128, lmax=128;
	uint8_t dir;
	//clear read buffer
	BigBuf_Clear_keep_EM();

	LFSetupFPGAForADC(95, true);
	DoAcquisition_default(0, true);

	lmin = 64;
	lmax = 192;

	i = 2;

	/* Find first local max/min */
    if(dest[1] > dest[0]) {
		while(i < GraphTraceLen) {
            if( !(dest[i] > dest[i-1]) && dest[i] > lmax)
				break;
			i++;
		}
		dir = 0;
	}
	else {
		while(i < GraphTraceLen) {
            if( !(dest[i] < dest[i-1]) && dest[i] < lmin)
				break;
			i++;
		}
		dir = 1;
	}

	lastval = i++;
	half_switch = 0;
	pmc = 0;
	block_done = 0;

	for (bitidx = 0; i < GraphTraceLen; i++)
	{
        if ( (dest[i-1] > dest[i] && dir == 1 && dest[i] > lmax) || (dest[i-1] < dest[i] && dir == 0 && dest[i] < lmin))
		{
			lc = i - lastval;
			lastval = i;

			// Switch depending on lc length:
			// Tolerance is 1/8 of clock rate (arbitrary)
			if (abs(lc-clock/4) < tolerance) {
				// 16T0
				if((i - pmc) == lc) { /* 16T0 was previous one */
					/* It's a PMC ! */
					i += (128+127+16+32+33+16)-1;
					lastval = i;
					pmc = 0;
					block_done = 1;
				}
				else {
					pmc = i;
				}
			} else if (abs(lc-clock/2) < tolerance) {
				// 32TO
				if((i - pmc) == lc) { /* 16T0 was previous one */
					/* It's a PMC ! */
					i += (128+127+16+32+33)-1;
					lastval = i;
					pmc = 0;
					block_done = 1;
				}
				else if(half_switch == 1) {
                    bits[bitidx++] = 0;
					half_switch = 0;
				}
				else
					half_switch++;
			} else if (abs(lc-clock) < tolerance) {
				// 64TO
                bits[bitidx++] = 1;
			} else {
				// Error
				warnings++;
				if (warnings > 10)
				{
					Dbprintf("Error: too many detection errors, aborting.");
					return 0;
				}
			}

			if(block_done == 1) {
				if(bitidx == 128) {
					for(j=0; j<16; j++) {
                        blocks[num_blocks][j] = 128*bits[j*8+7]+
                                64*bits[j*8+6]+
                                32*bits[j*8+5]+
                                16*bits[j*8+4]+
                                8*bits[j*8+3]+
                                4*bits[j*8+2]+
                                2*bits[j*8+1]+
                                bits[j*8];
						
					}
					num_blocks++;
				}
				bitidx = 0;
				block_done = 0;
				half_switch = 0;
			}
			if(i < GraphTraceLen)
                dir =(dest[i-1] > dest[i]) ? 0 : 1;
		}
		if(bitidx==255)
			bitidx=0;
		warnings = 0;
		if(num_blocks == 4) break;
	}
    memcpy(outBlocks, blocks, 16*num_blocks);
	return num_blocks;
}

int IsBlock0PCF7931(uint8_t *Block) {
	// Assume RFU means 0 :)
	if((memcmp(Block, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) == 0) && memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) // PAC enabled
		return 1;
	if((memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) && Block[7] == 0) // PAC disabled, can it *really* happen ?
		return 1;
	return 0;
}

int IsBlock1PCF7931(uint8_t *Block) {
	// Assume RFU means 0 :)
	if(Block[10] == 0 && Block[11] == 0 && Block[12] == 0 && Block[13] == 0)
		if((Block[14] & 0x7f) <= 9 && Block[15] <= 9)
			return 1;

	return 0;
}

void ReadPCF7931() {
	uint8_t Blocks[8][17];
	uint8_t tmpBlocks[4][16];
	int i, j, ind, ind2, n;
	int num_blocks = 0;
	int max_blocks = 8;
	int ident = 0;
	int error = 0;
	int tries = 0;

	memset(Blocks, 0, 8*17*sizeof(uint8_t));

	do {
		memset(tmpBlocks, 0, 4*16*sizeof(uint8_t));
		n = DemodPCF7931((uint8_t**)tmpBlocks);
		if(!n)
			error++;
		if(error==10 && num_blocks == 0) {
			Dbprintf("Error, no tag or bad tag");
			return;
		}
		else if (tries==20 || error==10) {
			Dbprintf("Error reading the tag");
			Dbprintf("Here is the partial content");
			goto end;
		}

		for(i=0; i<n; i++)
			Dbprintf("(dbg) %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
					 tmpBlocks[i][0], tmpBlocks[i][1], tmpBlocks[i][2], tmpBlocks[i][3], tmpBlocks[i][4], tmpBlocks[i][5], tmpBlocks[i][6], tmpBlocks[i][7],
					tmpBlocks[i][8], tmpBlocks[i][9], tmpBlocks[i][10], tmpBlocks[i][11], tmpBlocks[i][12], tmpBlocks[i][13], tmpBlocks[i][14], tmpBlocks[i][15]);
		if(!ident) {
			for(i=0; i<n; i++) {
				if(IsBlock0PCF7931(tmpBlocks[i])) {
					// Found block 0 ?
					if(i < n-1 && IsBlock1PCF7931(tmpBlocks[i+1])) {
						// Found block 1!
						// \o/
						ident = 1;
						memcpy(Blocks[0], tmpBlocks[i], 16);
						Blocks[0][ALLOC] = 1;
						memcpy(Blocks[1], tmpBlocks[i+1], 16);
						Blocks[1][ALLOC] = 1;
						max_blocks = max((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
						// Debug print
						Dbprintf("(dbg) Max blocks: %d", max_blocks);
						num_blocks = 2;
						// Handle following blocks
						for(j=i+2, ind2=2; j!=i; j++, ind2++, num_blocks++) {
							if(j==n) j=0;
							if(j==i) break;
							memcpy(Blocks[ind2], tmpBlocks[j], 16);
							Blocks[ind2][ALLOC] = 1;
						}
						break;
					}
				}
			}
		}
		else {
			for(i=0; i<n; i++) { // Look for identical block in known blocks
				if(memcmp(tmpBlocks[i], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)) { // Block is not full of 00
					for(j=0; j<max_blocks; j++) {
						if(Blocks[j][ALLOC] == 1 && !memcmp(tmpBlocks[i], Blocks[j], 16)) {
							// Found an identical block
							for(ind=i-1,ind2=j-1; ind >= 0; ind--,ind2--) {
								if(ind2 < 0)
									ind2 = max_blocks;
								if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
									// Dbprintf("Tmp %d -> Block %d", ind, ind2);
									memcpy(Blocks[ind2], tmpBlocks[ind], 16);
									Blocks[ind2][ALLOC] = 1;
									num_blocks++;
									if(num_blocks == max_blocks) goto end;
								}
							}
							for(ind=i+1,ind2=j+1; ind < n; ind++,ind2++) {
								if(ind2 > max_blocks)
									ind2 = 0;
								if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
									// Dbprintf("Tmp %d -> Block %d", ind, ind2);
									memcpy(Blocks[ind2], tmpBlocks[ind], 16);
									Blocks[ind2][ALLOC] = 1;
									num_blocks++;
									if(num_blocks == max_blocks) goto end;
								}
							}
						}
					}
				}
			}
		}
		tries++;
		if (BUTTON_PRESS()) return;
	} while (num_blocks != max_blocks);
 end:
	Dbprintf("-----------------------------------------");
	Dbprintf("Memory content:");
	Dbprintf("-----------------------------------------");
	for(i=0; i<max_blocks; i++) {
		if(Blocks[i][ALLOC]==1)
			Dbprintf("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
					 Blocks[i][0], Blocks[i][1], Blocks[i][2], Blocks[i][3], Blocks[i][4], Blocks[i][5], Blocks[i][6], Blocks[i][7],
					Blocks[i][8], Blocks[i][9], Blocks[i][10], Blocks[i][11], Blocks[i][12], Blocks[i][13], Blocks[i][14], Blocks[i][15]);
		else
			Dbprintf("<missing block %d>", i);
	}
	Dbprintf("-----------------------------------------");

	cmd_send(CMD_ACK,0,0,0,0,0);
}


/* Write on a byte of a PCF7931 tag
 * @param address : address of the block to write
   @param byte : address of the byte to write
    @param data : data to write
 */
void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, uint8_t pass5, uint8_t pass6, uint8_t pass7, uint16_t init_delay, int32_t l, int32_t p, uint8_t address, uint8_t byte, uint8_t data)
{

	uint32_t tab[1024]={0}; // data times frame
	uint32_t u = 0;
	uint8_t parity = 0;
	bool comp = 0;

	//BUILD OF THE DATA FRAME

	//alimentation of the tag (time for initializing)
	AddPatternPCF7931(init_delay, 0, 8192/2*T0_PCF, tab);

	//PMC
	Dbprintf("Initialization delay : %d us", init_delay);
	AddPatternPCF7931(8192/2*T0_PCF + 319*T0_PCF+70, 3*T0_PCF, 29*T0_PCF, tab);

	Dbprintf("Offsets : %d us on the low pulses width, %d us on the low pulses positions", l, p);

	//password indication bit
	AddBitPCF7931(1, tab, l, p);


	//password (on 56 bits)
	Dbprintf("Password (LSB first on each byte) : %02x %02x %02x %02x %02x %02x %02x", pass1,pass2,pass3,pass4,pass5,pass6,pass7);
	AddBytePCF7931(pass1, tab, l, p);
	AddBytePCF7931(pass2, tab, l, p);
	AddBytePCF7931(pass3, tab, l, p);
	AddBytePCF7931(pass4, tab, l, p);
	AddBytePCF7931(pass5, tab, l, p);
	AddBytePCF7931(pass6, tab, l, p);
	AddBytePCF7931(pass7, tab, l, p);

	//programming mode (0 or 1)
	AddBitPCF7931(0, tab, l, p);

	//block adress on 6 bits
	Dbprintf("Block address : %02x", address);
	for (u=0; u<6; u++)
	{
		if (address&(1<<u)) {	// bit 1
			 parity++;
			 AddBitPCF7931(1, tab, l, p);
		} else{					// bit 0
			 AddBitPCF7931(0, tab, l, p);
		}
	}

	//byte address on 4 bits
	Dbprintf("Byte address : %02x", byte);
	for (u=0; u<4; u++)
	{
		if (byte&(1<<u)) {	// bit 1
			 parity++;
			 AddBitPCF7931(1, tab, l, p);
		} else{				// bit 0
			 AddBitPCF7931(0, tab, l, p);
		}
	}

	//data on 8 bits
	Dbprintf("Data : %02x", data);
	for (u=0; u<8; u++)
	{
		if (data&(1<<u)) {	// bit 1
			 parity++;
			 AddBitPCF7931(1, tab, l, p);
		} else{				//bit 0
			 AddBitPCF7931(0, tab, l, p);
		}
	}


	//parity bit
	if((parity%2)==0){
	 	AddBitPCF7931(0, tab, l, p); //even parity
	}else{
		AddBitPCF7931(1, tab, l, p);//odd parity
	}

	//time access memory
	AddPatternPCF7931(5120+2680, 0, 0, tab);

	//conversion of the scale time
	for(u=0;u<500;u++){
		tab[u]=(tab[u] * 3)/2;
	}


	//compennsation of the counter reload
	while (!comp){
		comp = 1;
		for(u=0;tab[u]!=0;u++){
			if(tab[u] > 0xFFFF){
			  tab[u] -= 0xFFFF;
			  comp = 0;
			}
		}
	}

	SendCmdPCF7931(tab);
}


/* Send a trame to a PCF7931 tags
 * @param tab : array of the data frame
 */

void SendCmdPCF7931(uint32_t * tab){
	uint16_t u=0;
	uint16_t tempo=0;

	Dbprintf("SENDING DATA FRAME...");

	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);

	FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU );

	LED_A_ON();

	// steal this pin from the SSP and use it to control the modulation
	AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
	AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;

	//initialization of the timer
	AT91C_BASE_PMC->PMC_PCER |= (0x1 << 12) | (0x1 << 13) | (0x1 << 14);
	AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
	AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK;  //clock at 48/32 MHz
	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;
	AT91C_BASE_TCB->TCB_BCR = 1;


	tempo = AT91C_BASE_TC0->TC_CV;
	for(u=0;tab[u]!= 0;u+=3){


		// modulate antenna
		HIGH(GPIO_SSC_DOUT);
		while(tempo !=  tab[u]){
			tempo = AT91C_BASE_TC0->TC_CV;
		}

		// stop modulating antenna
		LOW(GPIO_SSC_DOUT);
		while(tempo !=  tab[u+1]){
			tempo = AT91C_BASE_TC0->TC_CV;
		}


		// modulate antenna
		HIGH(GPIO_SSC_DOUT);
		while(tempo !=  tab[u+2]){
			tempo = AT91C_BASE_TC0->TC_CV;
		}


	}

	LED_A_OFF();
	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
	SpinDelay(200);


	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
	DbpString("FINISH !");
	DbpString("(Could be usefull to send the same trame many times)");
	LED(0xFFFF, 1000);
}


/* Add a byte for building the data frame of PCF7931 tags 
 * @param b : byte to add
 * @param tab : array of the data frame
 * @param l : offset on low pulse width
 * @param p : offset on low pulse positioning
 */

bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p){

	uint32_t u;
	for (u=0; u<8; u++)
	{
Commit	Line	Data
d10e08ae	1	#include "proxmark3.h"
	2	#include "apps.h"
	3	#include "lfsampling.h"
	4	#include "pcf7931.h"
	5	#include "string.h"
	6
	7	#define T0_PCF 8 //period for the pcf7931 in us
	8	#define ALLOC 16
	9
	10	#define abs(x) ( ((x)<0) ? -(x) : (x) )
	11	#define max(x,y) ( x<y ? y:x)
	12
	13	int DemodPCF7931(uint8_t **outBlocks) {
	14
	15	uint8_t bits[256] = {0x00};
	16	uint8_t blocks[8][16];
	17	uint8_t *dest = BigBuf_get_addr();
	18
	19	int GraphTraceLen = BigBuf_max_traceLen();
	20	if ( GraphTraceLen > 18000 )
	21	GraphTraceLen = 18000;
	22
	23
	24	int i, j, lastval, bitidx, half_switch;
	25	int clock = 64;
	26	int tolerance = clock / 8;
	27	int pmc, block_done;
	28	int lc, warnings = 0;
	29	int num_blocks = 0;
	30	int lmin=128, lmax=128;
	31	uint8_t dir;
3cec7061	32	//clear read buffer
29b75739	33	BigBuf_Clear_keep_EM();
d10e08ae	34
	35	LFSetupFPGAForADC(95, true);
	36	DoAcquisition_default(0, true);
	37
	38	lmin = 64;
	39	lmax = 192;
	40
	41	i = 2;
	42
	43	/* Find first local max/min */
	44	if(dest[1] > dest[0]) {
	45	while(i < GraphTraceLen) {
	46	if( !(dest[i] > dest[i-1]) && dest[i] > lmax)
	47	break;
	48	i++;
	49	}
	50	dir = 0;
	51	}
	52	else {
	53	while(i < GraphTraceLen) {
	54	if( !(dest[i] < dest[i-1]) && dest[i] < lmin)
	55	break;
	56	i++;
	57	}
	58	dir = 1;
	59	}
	60
	61	lastval = i++;
	62	half_switch = 0;
	63	pmc = 0;
	64	block_done = 0;
	65
	66	for (bitidx = 0; i < GraphTraceLen; i++)
	67	{
	68	if ( (dest[i-1] > dest[i] && dir == 1 && dest[i] > lmax) \|\| (dest[i-1] < dest[i] && dir == 0 && dest[i] < lmin))
	69	{
	70	lc = i - lastval;
	71	lastval = i;
	72
	73	// Switch depending on lc length:
	74	// Tolerance is 1/8 of clock rate (arbitrary)
	75	if (abs(lc-clock/4) < tolerance) {
	76	// 16T0
	77	if((i - pmc) == lc) { /* 16T0 was previous one */
	78	/* It's a PMC ! */
	79	i += (128+127+16+32+33+16)-1;
	80	lastval = i;
	81	pmc = 0;
	82	block_done = 1;
	83	}
	84	else {
	85	pmc = i;
	86	}
	87	} else if (abs(lc-clock/2) < tolerance) {
	88	// 32TO
	89	if((i - pmc) == lc) { /* 16T0 was previous one */
	90	/* It's a PMC ! */
	91	i += (128+127+16+32+33)-1;
	92	lastval = i;
	93	pmc = 0;
	94	block_done = 1;
	95	}
	96	else if(half_switch == 1) {
	97	bits[bitidx++] = 0;
98	half_switch = 0;
99	}
100	else
101	half_switch++;
102	} else if (abs(lc-clock) < tolerance) {
103	// 64TO
104	bits[bitidx++] = 1;
105	} else {
106	// Error
107	warnings++;
108	if (warnings > 10)
109	{
110	Dbprintf("Error: too many detection errors, aborting.");
111	return 0;
112	}
113	}
114
115	if(block_done == 1) {
116	if(bitidx == 128) {
117	for(j=0; j<16; j++) {
118	blocks[num_blocks][j] = 128bits[j8+7]+
119	64bits[j8+6]+
120	32bits[j8+5]+
121	16bits[j8+4]+
122	8bits[j8+3]+
123	4bits[j8+2]+
124	2bits[j8+1]+
125	bits[j*8];
126
127	}
128	num_blocks++;
129	}
130	bitidx = 0;
131	block_done = 0;
132	half_switch = 0;
133	}
134	if(i < GraphTraceLen)
135	dir =(dest[i-1] > dest[i]) ? 0 : 1;
136	}
137	if(bitidx==255)
138	bitidx=0;
139	warnings = 0;
140	if(num_blocks == 4) break;
141	}
142	memcpy(outBlocks, blocks, 16*num_blocks);
143	return num_blocks;
144	}
145
146	int IsBlock0PCF7931(uint8_t *Block) {
147	// Assume RFU means 0 :)
148	if((memcmp(Block, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) == 0) && memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) // PAC enabled
149	return 1;
150	if((memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) && Block[7] == 0) // PAC disabled, can it really happen ?
151	return 1;
152	return 0;
153	}
154
155	int IsBlock1PCF7931(uint8_t *Block) {
156	// Assume RFU means 0 :)
157	if(Block[10] == 0 && Block[11] == 0 && Block[12] == 0 && Block[13] == 0)
158	if((Block[14] & 0x7f) <= 9 && Block[15] <= 9)
159	return 1;
160
161	return 0;
162	}
163
164	void ReadPCF7931() {
165	uint8_t Blocks[8][17];
166	uint8_t tmpBlocks[4][16];
167	int i, j, ind, ind2, n;
168	int num_blocks = 0;
169	int max_blocks = 8;
170	int ident = 0;
171	int error = 0;
172	int tries = 0;
173
174	memset(Blocks, 0, 817sizeof(uint8_t));
175
176	do {
177	memset(tmpBlocks, 0, 416sizeof(uint8_t));
178	n = DemodPCF7931((uint8_t**)tmpBlocks);
179	if(!n)
180	error++;
181	if(error==10 && num_blocks == 0) {
182	Dbprintf("Error, no tag or bad tag");
183	return;
184	}
185	else if (tries==20 \|\| error==10) {
186	Dbprintf("Error reading the tag");
187	Dbprintf("Here is the partial content");
188	goto end;
189	}
190
191	for(i=0; i<n; i++)
192	Dbprintf("(dbg) %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
193	tmpBlocks[i][0], tmpBlocks[i][1], tmpBlocks[i][2], tmpBlocks[i][3], tmpBlocks[i][4], tmpBlocks[i][5], tmpBlocks[i][6], tmpBlocks[i][7],
194	tmpBlocks[i][8], tmpBlocks[i][9], tmpBlocks[i][10], tmpBlocks[i][11], tmpBlocks[i][12], tmpBlocks[i][13], tmpBlocks[i][14], tmpBlocks[i][15]);
195	if(!ident) {
196	for(i=0; i<n; i++) {
197	if(IsBlock0PCF7931(tmpBlocks[i])) {
198	// Found block 0 ?
199	if(i < n-1 && IsBlock1PCF7931(tmpBlocks[i+1])) {
200	// Found block 1!
201	// \o/
202	ident = 1;
203	memcpy(Blocks[0], tmpBlocks[i], 16);
204	Blocks[0][ALLOC] = 1;
205	memcpy(Blocks[1], tmpBlocks[i+1], 16);
206	Blocks[1][ALLOC] = 1;
207	max_blocks = max((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
208	// Debug print
209	Dbprintf("(dbg) Max blocks: %d", max_blocks);
210	num_blocks = 2;
211	// Handle following blocks
212	for(j=i+2, ind2=2; j!=i; j++, ind2++, num_blocks++) {
213	if(j==n) j=0;
214	if(j==i) break;
215	memcpy(Blocks[ind2], tmpBlocks[j], 16);
216	Blocks[ind2][ALLOC] = 1;
217	}
218	break;
219	}
220	}
221	}
222	}
223	else {
224	for(i=0; i<n; i++) { // Look for identical block in known blocks
225	if(memcmp(tmpBlocks[i], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)) { // Block is not full of 00
226	for(j=0; j<max_blocks; j++) {
227	if(Blocks[j][ALLOC] == 1 && !memcmp(tmpBlocks[i], Blocks[j], 16)) {
228	// Found an identical block
229	for(ind=i-1,ind2=j-1; ind >= 0; ind--,ind2--) {
230	if(ind2 < 0)
231	ind2 = max_blocks;
232	if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
233	// Dbprintf("Tmp %d -> Block %d", ind, ind2);
234	memcpy(Blocks[ind2], tmpBlocks[ind], 16);
235	Blocks[ind2][ALLOC] = 1;
236	num_blocks++;
237	if(num_blocks == max_blocks) goto end;
238	}
239	}
240	for(ind=i+1,ind2=j+1; ind < n; ind++,ind2++) {
241	if(ind2 > max_blocks)
242	ind2 = 0;
243	if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
244	// Dbprintf("Tmp %d -> Block %d", ind, ind2);
245	memcpy(Blocks[ind2], tmpBlocks[ind], 16);
246	Blocks[ind2][ALLOC] = 1;
247	num_blocks++;
248	if(num_blocks == max_blocks) goto end;
249	}
250	}
251	}
252	}
253	}
254	}
255	}
256	tries++;
257	if (BUTTON_PRESS()) return;
258	} while (num_blocks != max_blocks);
259	end:
260	Dbprintf("-----------------------------------------");
261	Dbprintf("Memory content:");
262	Dbprintf("-----------------------------------------");
263	for(i=0; i<max_blocks; i++) {
264	if(Blocks[i][ALLOC]==1)
265	Dbprintf("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
266	Blocks[i][0], Blocks[i][1], Blocks[i][2], Blocks[i][3], Blocks[i][4], Blocks[i][5], Blocks[i][6], Blocks[i][7],
267	Blocks[i][8], Blocks[i][9], Blocks[i][10], Blocks[i][11], Blocks[i][12], Blocks[i][13], Blocks[i][14], Blocks[i][15]);
268	else
269	Dbprintf("<missing block %d>", i);
270	}
271	Dbprintf("-----------------------------------------");
272
7cfc777b	273	cmd_send(CMD_ACK,0,0,0,0,0);
d10e08ae	274	}
	275
	276
	277	/* Write on a byte of a PCF7931 tag
	278	* @param address : address of the block to write
	279	@param byte : address of the byte to write
	280	@param data : data to write
	281	*/
	282	void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, uint8_t pass5, uint8_t pass6, uint8_t pass7, uint16_t init_delay, int32_t l, int32_t p, uint8_t address, uint8_t byte, uint8_t data)
	283	{
	284
	285	uint32_t tab[1024]={0}; // data times frame
	286	uint32_t u = 0;
	287	uint8_t parity = 0;
	288	bool comp = 0;
	289
	290	//BUILD OF THE DATA FRAME
	291
	292	//alimentation of the tag (time for initializing)
	293	AddPatternPCF7931(init_delay, 0, 8192/2*T0_PCF, tab);
	294
	295	//PMC
	296	Dbprintf("Initialization delay : %d us", init_delay);
	297	AddPatternPCF7931(8192/2T0_PCF + 319T0_PCF+70, 3T0_PCF, 29T0_PCF, tab);
	298
	299	Dbprintf("Offsets : %d us on the low pulses width, %d us on the low pulses positions", l, p);
	300
	301	//password indication bit
	302	AddBitPCF7931(1, tab, l, p);
	303
	304
	305	//password (on 56 bits)
	306	Dbprintf("Password (LSB first on each byte) : %02x %02x %02x %02x %02x %02x %02x", pass1,pass2,pass3,pass4,pass5,pass6,pass7);
	307	AddBytePCF7931(pass1, tab, l, p);
	308	AddBytePCF7931(pass2, tab, l, p);
	309	AddBytePCF7931(pass3, tab, l, p);
	310	AddBytePCF7931(pass4, tab, l, p);
	311	AddBytePCF7931(pass5, tab, l, p);
	312	AddBytePCF7931(pass6, tab, l, p);
	313	AddBytePCF7931(pass7, tab, l, p);
	314
	315	//programming mode (0 or 1)
	316	AddBitPCF7931(0, tab, l, p);
	317
	318	//block adress on 6 bits
	319	Dbprintf("Block address : %02x", address);
	320	for (u=0; u<6; u++)
	321	{
	322	if (address&(1<<u)) { // bit 1
	323	parity++;
	324	AddBitPCF7931(1, tab, l, p);
	325	} else{ // bit 0
	326	AddBitPCF7931(0, tab, l, p);
	327	}
	328	}
	329
	330	//byte address on 4 bits
	331	Dbprintf("Byte address : %02x", byte);
	332	for (u=0; u<4; u++)
	333	{
	334	if (byte&(1<<u)) { // bit 1
	335	parity++;
	336	AddBitPCF7931(1, tab, l, p);
	337	} else{ // bit 0
338	AddBitPCF7931(0, tab, l, p);
339	}
340	}
341
342	//data on 8 bits
343	Dbprintf("Data : %02x", data);
344	for (u=0; u<8; u++)
345	{
346	if (data&(1<<u)) { // bit 1
347	parity++;
348	AddBitPCF7931(1, tab, l, p);
349	} else{ //bit 0
350	AddBitPCF7931(0, tab, l, p);
351	}
352	}
353
354
355	//parity bit
356	if((parity%2)==0){
357	AddBitPCF7931(0, tab, l, p); //even parity
358	}else{
359	AddBitPCF7931(1, tab, l, p);//odd parity
360	}
361
362	//time access memory
363	AddPatternPCF7931(5120+2680, 0, 0, tab);
364
365	//conversion of the scale time
366	for(u=0;u<500;u++){
367	tab[u]=(tab[u] * 3)/2;
368	}
369
370
371	//compennsation of the counter reload
372	while (!comp){
373	comp = 1;
374	for(u=0;tab[u]!=0;u++){
375	if(tab[u] > 0xFFFF){
376	tab[u] -= 0xFFFF;
377	comp = 0;
378	}
379	}
380	}
381
382	SendCmdPCF7931(tab);
383	}
384
385
386
387	/* Send a trame to a PCF7931 tags
388	* @param tab : array of the data frame
389	*/
390
391	void SendCmdPCF7931(uint32_t * tab){
392	uint16_t u=0;
393	uint16_t tempo=0;
394
395	Dbprintf("SENDING DATA FRAME...");
396
397	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
398
399	FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
400
401	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU );
402
403	LED_A_ON();
404
405	// steal this pin from the SSP and use it to control the modulation
406	AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
407	AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
408
409	//initialization of the timer
410	AT91C_BASE_PMC->PMC_PCER \|= (0x1 << 12) \| (0x1 << 13) \| (0x1 << 14);
411	AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE \| AT91C_TCB_TC1XC1S_TIOA0 \| AT91C_TCB_TC2XC2S_NONE;
412	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
413	AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; //clock at 48/32 MHz
414	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;
415	AT91C_BASE_TCB->TCB_BCR = 1;
416
417
418	tempo = AT91C_BASE_TC0->TC_CV;
419	for(u=0;tab[u]!= 0;u+=3){
420
421
422	// modulate antenna
423	HIGH(GPIO_SSC_DOUT);
424	while(tempo != tab[u]){
425	tempo = AT91C_BASE_TC0->TC_CV;
426	}
427
428	// stop modulating antenna
429	LOW(GPIO_SSC_DOUT);
430	while(tempo != tab[u+1]){
431	tempo = AT91C_BASE_TC0->TC_CV;
432	}
433
434
435	// modulate antenna
436	HIGH(GPIO_SSC_DOUT);
437	while(tempo != tab[u+2]){
438	tempo = AT91C_BASE_TC0->TC_CV;
439	}
440
441
442	}
443
444	LED_A_OFF();
445	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
446	SpinDelay(200);
447
448
449	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
450	DbpString("FINISH !");
451	DbpString("(Could be usefull to send the same trame many times)");
452	LED(0xFFFF, 1000);
453	}
454
455
456	/* Add a byte for building the data frame of PCF7931 tags
457	* @param b : byte to add
458	* @param tab : array of the data frame
459	* @param l : offset on low pulse width
460	* @param p : offset on low pulse positioning
461	*/
462
463	bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p){
464
465	uint32_t u;
466	for (u=0; u<8; u++)
467	{
468