#include "proxmark3.h"
#include "apps.h"
+#include "usb_cdc.h"
#include "lfsampling.h"
#include "pcf7931.h"
+#include "util.h"
#include "string.h"
+#include "fpgaloader.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};
+size_t DemodPCF7931(uint8_t **outBlocks) {
+ uint8_t bits[256] = {0x00};
uint8_t blocks[8][16];
- uint8_t *dest = BigBuf_get_addr();
-
+ uint8_t *dest = BigBuf_get_addr();
+
int GraphTraceLen = BigBuf_max_traceLen();
- if ( GraphTraceLen > 18000 )
+ 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;
+ size_t num_blocks = 0;
int lmin=128, lmax=128;
uint8_t dir;
//clear read buffer
i = 2;
/* Find first local max/min */
- if(dest[1] > dest[0]) {
+ if(dest[1] > dest[0]) {
while(i < GraphTraceLen) {
- if( !(dest[i] > dest[i-1]) && dest[i] > lmax)
+ if( !(dest[i] > dest[i-1]) && dest[i] > lmax)
break;
i++;
}
dir = 0;
- }
- else {
+ } else {
while(i < GraphTraceLen) {
- if( !(dest[i] < dest[i-1]) && dest[i] < lmin)
+ if( !(dest[i] < dest[i-1]) && dest[i] < lmin)
break;
i++;
}
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))
- {
+ 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) {
+ if (ABS(lc-clock/4) < tolerance) {
// 16T0
if((i - pmc) == lc) { /* 16T0 was previous one */
/* It's a PMC ! */
lastval = i;
pmc = 0;
block_done = 1;
- }
- else {
+ } else {
pmc = i;
}
- } else if (abs(lc-clock/2) < tolerance) {
+ } else if (ABS(lc-clock/2) < tolerance) {
// 32TO
if((i - pmc) == lc) { /* 16T0 was previous one */
/* It's a PMC ! */
lastval = i;
pmc = 0;
block_done = 1;
- }
- else if(half_switch == 1) {
- bits[bitidx++] = 0;
+ } else if(half_switch == 1) {
+ bits[bitidx++] = 0;
half_switch = 0;
}
else
half_switch++;
- } else if (abs(lc-clock) < tolerance) {
+ } else if (ABS(lc-clock) < tolerance) {
// 64TO
- bits[bitidx++] = 1;
+ bits[bitidx++] = 1;
} else {
// Error
- warnings++;
- if (warnings > 10)
- {
+ 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];
-
+ 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++;
}
half_switch = 0;
}
if(i < GraphTraceLen)
- dir =(dest[i-1] > dest[i]) ? 0 : 1;
+ 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);
+ 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;
+bool IsBlock0PCF7931(uint8_t *block) {
+ // assuming all RFU bits are set to 0
+ // if PAC is enabled password is set to 0
+ if (block[7] == 0x01)
+ {
+ if (!memcmp(block, "\x00\x00\x00\x00\x00\x00\x00", 7) && !memcmp(block+9, "\x00\x00\x00\x00\x00\x00\x00", 7))
+ return true;
+ }
+ else if (block[7] == 0x00)
+ {
+ if (!memcmp(block+9, "\x00\x00\x00\x00\x00\x00\x00", 7))
+ return true;
+ }
+ return false;
}
-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;
+bool IsBlock1PCF7931(uint8_t *block) {
+ // assuming all RFU bits are set to 0
- return 0;
+ uint8_t rb1 = block[14] & 0x80;
+ uint8_t rfb = block[14] & 0x7f;
+ uint8_t rlb = block[15];
+
+ if (block[10] == 0 && block[11] == 0 && block[12] == 0 && block[13] == 0)
+ // block 1 is sent only if (RLB >= 1 && RFB <= 1) or RB1 enabled
+ if(rfb <= rlb && rfb <= 9 && rlb <= 9 && ((rfb <= 1 && rlb >= 1) || rb1))
+ return true;
+
+ return false;
}
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;
+ int found_blocks = 0; // successfully read blocks
+ int max_blocks = 8; // readable blocks
+ uint8_t memory_blocks[8][17]; // PCF content
+
+ uint8_t single_blocks[8][17]; // PFC blocks with unknown position
+ int single_blocks_cnt = 0;
+
+ size_t n = 0; // transmitted blocks
+ uint8_t tmp_blocks[4][16]; // temporary read buffer
+
+ uint8_t found_0_1 = 0; // flag: blocks 0 and 1 were found
+ int errors = 0; // error counter
+ int tries = 0; // tries counter
+
+ memset(memory_blocks, 0, 8*17*sizeof(uint8_t));
+ memset(single_blocks, 0, 8*17*sizeof(uint8_t));
- memset(Blocks, 0, 8*17*sizeof(uint8_t));
+ int i = 0, j = 0;
do {
- memset(tmpBlocks, 0, 4*16*sizeof(uint8_t));
- n = DemodPCF7931((uint8_t**)tmpBlocks);
+ i = 0;
+
+ memset(tmp_blocks, 0, 4*16*sizeof(uint8_t));
+ n = DemodPCF7931((uint8_t**)tmp_blocks);
if(!n)
- error++;
- if(error==10 && num_blocks == 0) {
+ ++errors;
+
+ // exit if no block is received
+ if (errors >= 10 && found_blocks == 0 && single_blocks_cnt == 0) {
Dbprintf("Error, no tag or bad tag");
return;
}
- else if (tries==20 || error==10) {
+
+ // exit if too many errors during reading
+ if (tries > 50 && (2*errors > tries)) {
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;
- }
+ // our logic breaks if we don't get at least two blocks
+ if (n < 2) {
+ // skip if all 0s block or no blocks
+ if (n == 0 || !memcmp(tmp_blocks[0], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16))
+ continue;
+
+ // add block to single blocks list
+ if (single_blocks_cnt < max_blocks) {
+ for (i = 0; i < single_blocks_cnt; ++i) {
+ if (!memcmp(single_blocks[i], tmp_blocks[0], 16)) {
+ j = 1;
break;
}
}
+ if (j != 1) {
+ memcpy(single_blocks[single_blocks_cnt], tmp_blocks[0], 16);
+ print_result("got single block", single_blocks[single_blocks_cnt], 16);
+ single_blocks_cnt++;
+ }
+ j = 0;
}
+ ++tries;
+ continue;
}
- 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;
- }
+
+ Dbprintf("(dbg) got %d blocks (%d/%d found) (%d tries, %d errors)", n, found_blocks, (max_blocks == 0 ? found_blocks : max_blocks), tries, errors);
+ for (i = 0; i < n; ++i)
+ {
+ print_result("got consecutive blocks", tmp_blocks[i], 16);
+ }
+
+ i = 0;
+ if(!found_0_1) {
+ while (i < n - 1) {
+ if (IsBlock0PCF7931(tmp_blocks[i]) && IsBlock1PCF7931(tmp_blocks[i+1])) {
+ found_0_1 = 1;
+ memcpy(memory_blocks[0], tmp_blocks[i], 16);
+ memcpy(memory_blocks[1], tmp_blocks[i+1], 16);
+ memory_blocks[0][ALLOC] = memory_blocks[1][ALLOC] = 1;
+ // block 1 tells how many blocks are going to be sent
+ max_blocks = MAX((memory_blocks[1][14] & 0x7f), memory_blocks[1][15]) + 1;
+ found_blocks = 2;
+
+ Dbprintf("Found blocks 0 and 1. PCF is transmitting %d blocks.", max_blocks);
+
+ // handle the following blocks
+ for (j = i + 2; j < n; ++j) {
+ memcpy(memory_blocks[found_blocks], tmp_blocks[j], 16);
+ memory_blocks[found_blocks][ALLOC] = 1;
+ ++found_blocks;
+ }
+ break;
+ }
+ ++i;
+ }
+ } else {
+ // Trying to re-order blocks
+ // Look for identical block in memory blocks
+ while (i < n-1) {
+ // skip all zeroes blocks
+ if (memcmp(tmp_blocks[i], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)) {
+ for (j = 1; j < max_blocks - 1; ++j) {
+ if (!memcmp(tmp_blocks[i], memory_blocks[j], 16) && !memory_blocks[j+1][ALLOC]) {
+ memcpy(memory_blocks[j+1], tmp_blocks[i+1], 16);
+ memory_blocks[j+1][ALLOC] = 1;
+ if (++found_blocks >= max_blocks) goto end;
+ }
+ }
+ }
+ if (memcmp(tmp_blocks[i+1], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)) {
+ for (j = 0; j < max_blocks; ++j) {
+ if (!memcmp(tmp_blocks[i+1], memory_blocks[j], 16) && !memory_blocks[(j == 0 ? max_blocks : j) -1][ALLOC]) {
+ if (j == 0) {
+ memcpy(memory_blocks[max_blocks - 1], tmp_blocks[i], 16);
+ memory_blocks[max_blocks - 1][ALLOC] = 1;
+ } else {
+ memcpy(memory_blocks[j-1], tmp_blocks[i], 16);
+ memory_blocks[j-1][ALLOC] = 1;
}
+ if (++found_blocks >= max_blocks) goto end;
}
}
}
+ ++i;
}
}
- tries++;
- if (BUTTON_PRESS()) return;
- } while (num_blocks != max_blocks);
+ ++tries;
+ if (BUTTON_PRESS()) {
+ Dbprintf("Button pressed, stopping.");
+ goto end;
+ }
+ }
+ while (found_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]);
+ for (i = 0; i < max_blocks; ++i) {
+ if (memory_blocks[i][ALLOC])
+ print_result("Block", memory_blocks[i], 16);
else
Dbprintf("<missing block %d>", i);
}
Dbprintf("-----------------------------------------");
+ if (found_blocks < max_blocks) {
+ Dbprintf("-----------------------------------------");
+ Dbprintf("Blocks with unknown position:");
+ Dbprintf("-----------------------------------------");
+ for (i = 0; i < single_blocks_cnt; ++i)
+ print_result("Block", single_blocks[i], 16);
+
+ 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)
-{
-
+static void RealWritePCF7931(uint8_t *pass, 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);
-
+ // password (on 56 bits)
+ AddBytePCF7931(pass[0], tab, l, p);
+ AddBytePCF7931(pass[1], tab, l, p);
+ AddBytePCF7931(pass[2], tab, l, p);
+ AddBytePCF7931(pass[3], tab, l, p);
+ AddBytePCF7931(pass[4], tab, l, p);
+ AddBytePCF7931(pass[5], tab, l, p);
+ AddBytePCF7931(pass[6], 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++;
+ for (u = 0; u < 6; ++u) {
+ if (address & (1 << u)) { // bit 1
+ ++parity;
AddBitPCF7931(1, tab, l, p);
- } else{ // bit 0
+ } else { // bit 0
AddBitPCF7931(0, tab, l, p);
}
}
//byte address on 4 bits
- Dbprintf("Byte address : %02x", byte);
- for (u=0; u<4; u++)
+ for (u = 0; u < 4; ++u)
{
- if (byte&(1<<u)) { // bit 1
+ if (byte & (1 << u)) { // bit 1
parity++;
AddBitPCF7931(1, tab, l, p);
- } else{ // bit 0
- AddBitPCF7931(0, 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
+ if (data&(1<<u)) { // bit 1
parity++;
AddBitPCF7931(1, tab, l, p);
- } else{ //bit 0
- AddBitPCF7931(0, 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{
+ 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;
- }
-
+ for (u = 0; u < 500; ++u)
+ tab[u] = (tab[u] * 3) / 2;
//compennsation of the counter reload
- while (!comp){
+ while (!comp) {
comp = 1;
- for(u=0;tab[u]!=0;u++){
- if(tab[u] > 0xFFFF){
+ for (u = 0; tab[u] != 0; ++u)
+ if(tab[u] > 0xFFFF) {
tab[u] -= 0xFFFF;
comp = 0;
}
- }
}
SendCmdPCF7931(tab);
}
+void BruteForcePCF7931(uint64_t password, uint8_t tries, uint16_t init_delay, int32_t l, int32_t p) {
+ uint8_t i = 0;
+ uint8_t pass_array[7];
+
+ while (password < 0x00FFFFFFFFFFFFFF) {
+ if (BUTTON_PRESS()) {
+ Dbprintf("Button pressed, stopping bruteforce ...");
+ return;
+ }
+
+ num_to_bytes(password, 7, pass_array);
+
+ Dbprintf("Trying: %02x %02x %02x %02x %02x %02x %02x ...",
+ pass_array[0],
+ pass_array[1],
+ pass_array[2],
+ pass_array[3],
+ pass_array[4],
+ pass_array[5],
+ pass_array[6]);
+
+ for (i = 0; i < tries; ++i)
+ RealWritePCF7931
+ (
+ pass_array,
+ init_delay,
+ l,
+ p,
+ 0,
+ 7,
+ 0x01
+ );
+
+ ++password;
+ }
+}
+
+/* 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) {
+ Dbprintf("Initialization delay : %d us", init_delay);
+ Dbprintf("Offsets : %d us on the low pulses width, %d us on the low pulses positions", l, p);
+ Dbprintf("Password (LSB first on each byte): %02x %02x %02x %02x %02x %02x %02x", pass1, pass2, pass3, pass4, pass5, pass6, pass7);
+ Dbprintf("Block address : %02x", address);
+ Dbprintf("Byte address : %02x", byte);
+ Dbprintf("Data : %02x", data);
+
+ uint8_t password[7] = {pass1, pass2, pass3, pass4, pass5, pass6, pass7};
+
+ RealWritePCF7931 (password, init_delay, l, p, address, byte, data);
+}
+
/* Send a trame to a PCF7931 tags
* @param tab : array of the data frame
*/
-void SendCmdPCF7931(uint32_t * tab){
+void SendCmdPCF7931(uint32_t * tab) {
uint16_t u=0;
uint16_t tempo=0;
- Dbprintf("SENDING DATA FRAME...");
+ Dbprintf("Sending data frame ...");
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
-
FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU );
LED_A_ON();
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){
-
-
+ for (u = 0; tab[u] != 0; u += 3) {
// modulate antenna
HIGH(GPIO_SSC_DOUT);
- while(tempo != tab[u]){
+ while(tempo != tab[u])
tempo = AT91C_BASE_TC0->TC_CV;
- }
// stop modulating antenna
LOW(GPIO_SSC_DOUT);
- while(tempo != tab[u+1]){
+ while(tempo != tab[u+1])
tempo = AT91C_BASE_TC0->TC_CV;
- }
-
// modulate antenna
HIGH(GPIO_SSC_DOUT);
- while(tempo != tab[u+2]){
+ 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)");
+ DbpString("Data frame sent (multiple sends may be needed)");
LED(0xFFFF, 1000);
}
-/* Add a byte for building the data frame of PCF7931 tags
+/* 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){
-
+bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p) {
uint32_t u;
- for (u=0; u<8; u++)
- {
- if (byte&(1<<u)) { //bit à 1
+ for (u = 0; u < 8; ++u) {
+ if (byte & (1 << u)) { //bit is 1
if(AddBitPCF7931(1, tab, l, p)==1)return 1;
- } else { //bit à 0
+ } else { //bit is 0
if(AddBitPCF7931(0, tab, l, p)==1)return 1;
}
}
return 0;
}
-/* Add a bits for building the data frame of PCF7931 tags
+/* Add a bits for building the data frame of PCF7931 tags
* @param b : bit to add
* @param tab : array of the data frame
* @param l : offset on low pulse width
* @param p : offset on low pulse positioning
*/
-bool AddBitPCF7931(bool b, uint32_t * tab, int32_t l, int32_t p){
+bool AddBitPCF7931(bool b, uint32_t * tab, int32_t l, int32_t p) {
uint8_t u = 0;
- for(u=0;tab[u]!=0;u+=3){} //we put the cursor at the last value of the array
-
+ for (u = 0; tab[u] != 0; u += 3){} //we put the cursor at the last value of the array
- if(b==1){ //add a bit 1
- if(u==0) tab[u] = 34*T0_PCF+p;
- else tab[u] = 34*T0_PCF+tab[u-1]+p;
+ if (b == 1) { //add a bit 1
+ if (u == 0) tab[u] = 34 * T0_PCF + p;
+ else tab[u] = 34 * T0_PCF + tab[u-1] + p;
- tab[u+1] = 6*T0_PCF+tab[u]+l;
- tab[u+2] = 88*T0_PCF+tab[u+1]-l-p;
+ tab[u+1] = 6 * T0_PCF+tab[u] + l;
+ tab[u+2] = 88 * T0_PCF+tab[u + 1] - l - p;
return 0;
- }else{ //add a bit 0
+ } else { //add a bit 0
- if(u==0) tab[u] = 98*T0_PCF+p;
- else tab[u] = 98*T0_PCF+tab[u-1]+p;
+ if (u == 0) tab[u] = 98 * T0_PCF + p;
+ else tab[u] = 98 * T0_PCF + tab[u-1] + p;
- tab[u+1] = 6*T0_PCF+tab[u]+l;
- tab[u+2] = 24*T0_PCF+tab[u+1]-l-p;
+ tab[u + 1] = 6 * T0_PCF + tab[u] + l;
+ tab[u + 2] = 24 * T0_PCF + tab[u + 1] - l - p;
return 0;
}
-
return 1;
}
* @param c : delay of the last high pulse
* @param tab : array of the data frame
*/
-bool AddPatternPCF7931(uint32_t a, uint32_t b, uint32_t c, uint32_t * tab){
+bool AddPatternPCF7931(uint32_t a, uint32_t b, uint32_t c, uint32_t * tab) {
uint32_t u = 0;
- for(u=0;tab[u]!=0;u+=3){} //we put the cursor at the last value of the array
+ for(u = 0; tab[u] != 0; u += 3){} //we put the cursor at the last value of the array
- if(u==0) tab[u] = a;
- else tab[u] = a + tab[u-1];
+ if (u == 0) tab[u] = a;
+ else tab[u] = a + tab[u - 1];
- tab[u+1] = b+tab[u];
- tab[u+2] = c+tab[u+1];
+ tab[u + 1] = b + tab[u];
+ tab[u + 2] = c + tab[u + 1];
return 0;
}
projects / proxmark3-svn / blobdiff