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FIXED: lf t55xx fsk now demods but only to binary.

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ADD:  holimans lf io / hid fskdemod  changes.
This commit is contained in:
iceman1001
2014-10-23 18:36:44 +02:00
parent fbceacc5b8
commit 72e930ef32
10 changed files with 272 additions and 355 deletions
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38
armsrc/appmain.c
View File

@@ -24,6 +24,7 @@
#include "legicrf.h"
#include "../include/hitag2.h"
#ifdef WITH_LCD
#include "LCD.h"
#endif
@@ -359,6 +360,7 @@ void SamyRun()
int selected = 0;
int playing = 0;
int cardRead = 0;
// Turn on selected LED
LED(selected + 1, 0);
@@ -374,7 +376,7 @@ void SamyRun()
SpinDelay(300);
// Button was held for a second, begin recording
if (button_pressed > 0)
if (button_pressed > 0 && cardRead == 0)
{
LEDsoff();
LED(selected + 1, 0);
@@ -400,6 +402,40 @@ void SamyRun()
// If we were previously playing, set playing off
// so next button push begins playing what we recorded
playing = 0;
cardRead = 1;
}
else if (button_pressed > 0 && cardRead == 1)
{
LEDsoff();
LED(selected + 1, 0);
LED(LED_ORANGE, 0);
// record
Dbprintf("Cloning %x %x %x", selected, high[selected], low[selected]);
// wait for button to be released
while(BUTTON_PRESS())
WDT_HIT();
/* need this delay to prevent catching some weird data */
SpinDelay(500);
CopyHIDtoT55x7(high[selected], low[selected], 0, 0);
Dbprintf("Cloned %x %x %x", selected, high[selected], low[selected]);
LEDsoff();
LED(selected + 1, 0);
// Finished recording
// If we were previously playing, set playing off
// so next button push begins playing what we recorded
playing = 0;
cardRead = 0;
}
// Change where to record (or begin playing)

5
armsrc/apps.h
View File

@@ -72,7 +72,10 @@ void ToSendReset(void);
void ListenReaderField(int limit);
void AcquireRawAdcSamples125k(int at134khz);
void SnoopLFRawAdcSamples(int divisor, int trigger_threshold);
void DoAcquisition125k(int trigger_threshold);
void DoAcquisition125k_internal(int trigger_threshold, bool silent);
void DoAcquisition125k_threshold(int trigger_threshold);
void DoAcquisition125k();
extern int ToSendMax;
extern uint8_t ToSend[];
extern uint32_t BigBuf[];

496
armsrc/lfops.c
View File

@@ -42,17 +42,17 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
void AcquireRawAdcSamples125k(int divisor)
{
LFSetupFPGAForADC(divisor, true);
DoAcquisition125k(-1);
DoAcquisition125k();
}
void SnoopLFRawAdcSamples(int divisor, int trigger_threshold)
{
LFSetupFPGAForADC(divisor, false);
DoAcquisition125k(trigger_threshold);
DoAcquisition125k_threshold(trigger_threshold);
}
// split into two routines so we can avoid timing issues after sending commands //
void DoAcquisition125k(int trigger_threshold)
void DoAcquisition125k_internal(int trigger_threshold, bool silent)
{
uint8_t *dest = mifare_get_bigbufptr();
int n = 8000;
@@ -75,11 +75,18 @@ void DoAcquisition125k(int trigger_threshold)
if (++i >= n) break;
}
}
Dbprintf("buffer samples: %02x %02x %02x %02x %02x %02x %02x %02x ...",
if (!silent){
Dbprintf("buffer samples: %02x %02x %02x %02x %02x %02x %02x %02x ...",
dest[0], dest[1], dest[2], dest[3], dest[4], dest[5], dest[6], dest[7]);
}
}
void DoAcquisition125k_threshold(int trigger_threshold) {
DoAcquisition125k_internal(trigger_threshold, true);
}
void DoAcquisition125k() {
DoAcquisition125k_internal(-1, true);
}
void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1, uint8_t *command)
{
int at134khz;
@@ -138,7 +145,7 @@ void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1,
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
// now do the read
DoAcquisition125k(-1);
DoAcquisition125k();
}
/* blank r/w tag data stream
@@ -614,331 +621,206 @@ void CmdHIDsimTAG(int hi, int lo, int ledcontrol)
LED_A_OFF();
}
size_t fsk_demod(uint8_t * dest, size_t size)
{
uint32_t last_transition = 0;
uint32_t idx = 1;
// we don't care about actual value, only if it's more or less than a
// threshold essentially we capture zero crossings for later analysis
uint8_t threshold_value = 127;
// sync to first lo-hi transition, and threshold
//Need to threshold first sample
dest[0] = (dest[0] < threshold_value) ? 0 : 1;
size_t numBits = 0;
// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
// or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere
// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
for(idx = 1; idx < size; idx++) {
// threshold current value
dest[idx] = (dest[idx] < threshold_value) ? 0 : 1;
// Check for 0->1 transition
if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition
dest[numBits] = (idx-last_transition < 9) ? 1 : 0;
last_transition = idx;
numBits++;
}
}
return numBits; //Actually, it returns the number of bytes, but each byte represents a bit: 1 or 0
}
size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t h2l_crossing_value,uint8_t l2h_crossing_value, uint8_t maxConsequtiveBits )
{
uint8_t lastval=dest[0];
uint32_t idx=0;
size_t numBits=0;
uint32_t n=1;
for( idx=1; idx < size; idx++) {
if (dest[idx]==lastval) {
n++;
continue;
}
//if lastval was 1, we have a 1->0 crossing
if ( dest[idx-1] ) {
n=(n+1) / h2l_crossing_value;
} else {// 0->1 crossing
n=(n+1) / l2h_crossing_value;
}
if (n == 0) n = 1;
if(n < maxConsequtiveBits)
{
memset(dest+numBits, dest[idx-1] , n);
numBits += n;
}
n=0;
lastval=dest[idx];
}//end for
return numBits;
}
// loop to capture raw HID waveform then FSK demodulate the TAG ID from it
void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
{
uint8_t *dest = (uint8_t *)BigBuf;
int m=0, n=0, i=0, idx=0, found=0, lastval=0;
size_t size=0,idx=0; //, found=0;
uint32_t hi2=0, hi=0, lo=0;
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
// Connect the A/D to the peak-detected low-frequency path.
SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
while(!BUTTON_PRESS()) {
// Give it a bit of time for the resonant antenna to settle.
SpinDelay(50);
// Configure to go in 125Khz listen mode
LFSetupFPGAForADC(0,true);
// Now set up the SSC to get the ADC samples that are now streaming at us.
FpgaSetupSsc();
for(;;) {
WDT_HIT();
if (ledcontrol)
LED_A_ON();
if(BUTTON_PRESS()) {
DbpString("Stopped");
if (ledcontrol)
LED_A_OFF();
return;
}
if (ledcontrol) LED_A_ON();
i = 0;
m = sizeof(BigBuf);
memset(dest,128,m);
for(;;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = 0x43;
if (ledcontrol)
LED_D_ON();
}
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
// we don't care about actual value, only if it's more or less than a
// threshold essentially we capture zero crossings for later analysis
if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;
i++;
if (ledcontrol)
LED_D_OFF();
if(i >= m) {
break;
}
}
}
DoAcquisition125k();
size = sizeof(BigBuf);
// FSK demodulator
// sync to first lo-hi transition
for( idx=1; idx<m; idx++) {
if (dest[idx-1]<dest[idx])
lastval=idx;
break;
}
WDT_HIT();
// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
// or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere
// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
for( i=0; idx<m; idx++) {
if (dest[idx-1]<dest[idx]) {
dest[i]=idx-lastval;
if (dest[i] <= 8) {
dest[i]=1;
} else {
dest[i]=0;
}
lastval=idx;
i++;
}
}
m=i;
size = fsk_demod(dest, size);
WDT_HIT();
// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
lastval=dest[0];
idx=0;
i=0;
n=0;
for( idx=0; idx<m; idx++) {
if (dest[idx]==lastval) {
n++;
} else {
// a bit time is five fc/10 or six fc/8 cycles so figure out how many bits a pattern width represents,
// an extra fc/8 pattern preceeds every 4 bits (about 200 cycles) just to complicate things but it gets
// swallowed up by rounding
// expected results are 1 or 2 bits, any more and it's an invalid manchester encoding
// special start of frame markers use invalid manchester states (no transitions) by using sequences
// like 111000
if (dest[idx-1]) {
n=(n+1)/6; // fc/8 in sets of 6
} else {
n=(n+1)/5; // fc/10 in sets of 5
}
switch (n) { // stuff appropriate bits in buffer
case 0:
case 1: // one bit
dest[i++]=dest[idx-1];
break;
case 2: // two bits
dest[i++]=dest[idx-1];
dest[i++]=dest[idx-1];
break;
case 3: // 3 bit start of frame markers
dest[i++]=dest[idx-1];
dest[i++]=dest[idx-1];
dest[i++]=dest[idx-1];
break;
// When a logic 0 is immediately followed by the start of the next transmisson
// (special pattern) a pattern of 4 bit duration lengths is created.
case 4:
dest[i++]=dest[idx-1];
dest[i++]=dest[idx-1];
dest[i++]=dest[idx-1];
dest[i++]=dest[idx-1];
break;
default: // this shouldn't happen, don't stuff any bits
break;
}
n=0;
lastval=dest[idx];
}
}
m=i;
// 1->0 : fc/8 in sets of 6
// 0->1 : fc/10 in sets of 5
size = aggregate_bits(dest,size, 6,5,5);
WDT_HIT();
// final loop, go over previously decoded manchester data and decode into usable tag ID
// 111000 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0
for( idx=0; idx<m-6; idx++) {
uint8_t frame_marker_mask[] = {1,1,1,0,0,0};
int numshifts = 0;
idx = 0;
while( idx + sizeof(frame_marker_mask) < size) {
// search for a start of frame marker
if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )
{
found=1;
idx+=6;
if (found && (hi2|hi|lo)) {
if (hi2 != 0){
Dbprintf("TAG ID: %x%08x%08x (%d)",
(unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
}
else {
Dbprintf("TAG ID: %x%08x (%d)",
(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
}
/* if we're only looking for one tag */
if (findone)
{
*high = hi;
*low = lo;
return;
}
hi2=0;
hi=0;
lo=0;
found=0;
}
}
if (found) {
if (dest[idx] && (!dest[idx+1]) ) {
if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
{ // frame marker found
idx+=sizeof(frame_marker_mask);
while(dest[idx] != dest[idx+1] && idx < size-2)
{ // Keep going until next frame marker (or error)
// Shift in a bit. Start by shifting high registers
hi2=(hi2<<1)|(hi>>31);
hi=(hi<<1)|(lo>>31);
//Then, shift in a 0 or one into low
if (dest[idx] && !dest[idx+1]) // 1 0
lo=(lo<<1)|0;
} else if ( (!dest[idx]) && dest[idx+1]) {
hi2=(hi2<<1)|(hi>>31);
hi=(hi<<1)|(lo>>31);
lo=(lo<<1)|1;
} else {
found=0;
hi2=0;
hi=0;
lo=0;
else // 0 1
lo=(lo<<1)|
1;
numshifts ++;
idx += 2;
}
idx++;
}
if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )
{
found=1;
idx+=6;
if (found && (hi|lo)) {
if (hi2 != 0){
Dbprintf("TAG ID: %x%08x%08x (%d)",
(unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
}
else {
Dbprintf("TAG ID: %x%08x (%d)",
(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
}
/* if we're only looking for one tag */
if (findone)
{
*high = hi;
*low = lo;
return;
//Dbprintf("Num shifts: %d ", numshifts);
// Hopefully, we read a tag and hit upon the next frame marker
if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
{
if (hi2 != 0){
Dbprintf("TAG ID: %x%08x%08x (%d)",
(unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
}
else {
Dbprintf("TAG ID: %x%08x (%d)",
(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
}
hi2=0;
hi=0;
lo=0;
found=0;
}
// reset
hi2 = hi = lo = 0;
numshifts = 0;
}else
{
idx++;
}
}
WDT_HIT();
}
DbpString("Stopped");
if (ledcontrol) LED_A_OFF();
}
uint32_t bytebits_to_byte(uint8_t* src, int numbits)
{
uint32_t num = 0;
for(int i = 0 ; i < numbits ; i++)
{
num = (num << 1) | (*src);
src++;
}
return num;
}
void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
{
uint8_t *dest = mifare_get_bigbufptr();
int m=0, n=0, i=0, idx=0, lastval=0;
int found=0;
uint8_t *dest = (uint8_t *)BigBuf;
size_t size=0, idx=0;
uint32_t code=0, code2=0;
LFSetupFPGAForADC(0, true);
for(;;) {
while(!BUTTON_PRESS()) {
// Configure to go in 125Khz listen mode
LFSetupFPGAForADC(0,true);
WDT_HIT();
if (ledcontrol)
LED_A_ON();
if(BUTTON_PRESS()) {
DbpString("Stopped");
if (ledcontrol)
LED_A_OFF();
return;
}
if (ledcontrol) LED_A_ON();
i = 0;
m = 30000;
memset(dest,128,m);
for(;;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = 0x43;
if (ledcontrol)
LED_D_ON();
}
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
// we don't care about actual value, only if it's more or less than a
// threshold essentially we capture zero crossings for later analysis
dest[i] = (dest[i] < 127) ? 0 : 1;
++i;
if (ledcontrol)
LED_D_OFF();
if(i >= m)
break;
}
}
DoAcquisition125k(true);
size = sizeof(BigBuf);
// FSK demodulator
// sync to first lo-hi transition
for( idx=1; idx<m; idx++) {
if (dest[idx-1]<dest[idx])
lastval=idx;
break;
}
WDT_HIT();
// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
// or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere
// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
for( i=0; idx<m; idx++) {
if (dest[idx-1]<dest[idx]) {
dest[i]=idx-lastval;
dest[i] = (dest[i] <= 8) ? 1:0;
lastval=idx;
i++;
}
}
m=i;
size = fsk_demod(dest, size);
WDT_HIT();
// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
lastval=dest[0];
idx=0;
i=0;
n=0;
for( idx=0; idx<m; idx++) {
if (dest[idx]==lastval) {
n++;
} else {
// a bit time is five fc/10 or six fc/8 cycles so figure out how many bits a pattern width represents,
// an extra fc/8 pattern preceeds every 4 bits (about 200 cycles) just to complicate things but it gets
// swallowed up by rounding
// expected results are 1 or 2 bits, any more and it's an invalid manchester encoding
// special start of frame markers use invalid manchester states (no transitions) by using sequences
// like 111000
if (dest[idx-1]) {
n=(n+1)/7; // fc/8 in sets of 7
} else {
n=(n+1)/6; // fc/10 in sets of 6
}
// 1->0 : fc/8 in sets of 7
// 0->1 : fc/10 in sets of 6
size = aggregate_bits(dest, size, 7,6,13);
// stuff appropriate bits in buffer
if ( n==0 )
dest[i++]=dest[idx-1]^1;
else {
if ( n < 13){
for(int j=0; j<n; j++){
dest[i++]=dest[idx-1]^1;
}
}
}
n=0;
lastval=dest[idx];
}
}//end for
m=i;
WDT_HIT();
for( idx=0; idx<m-9; idx++) {
if ( !(dest[idx]) && !(dest[idx+1]) && !(dest[idx+2]) && !(dest[idx+3]) && !(dest[idx+4]) && !(dest[idx+5]) && !(dest[idx+6]) && !(dest[idx+7]) && !(dest[idx+8])&& (dest[idx+9])){
found=1;
//idx+=9;
if (found) {
//Handle the data
uint8_t mask[] = {0,0,0,0,0,0,0,0,0,1};
for( idx=0; idx < size - 64; idx++) {
if ( memcmp(dest + idx, mask, sizeof(mask)) ) continue;
Dbprintf("%d%d%d%d%d%d%d%d",dest[idx], dest[idx+1], dest[idx+2],dest[idx+3],dest[idx+4],dest[idx+5],dest[idx+6],dest[idx+7]);
Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+8], dest[idx+9], dest[idx+10],dest[idx+11],dest[idx+12],dest[idx+13],dest[idx+14],dest[idx+15]);
Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+16],dest[idx+17],dest[idx+18],dest[idx+19],dest[idx+20],dest[idx+21],dest[idx+22],dest[idx+23]);
@@ -948,54 +830,26 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+48],dest[idx+49],dest[idx+50],dest[idx+51],dest[idx+52],dest[idx+53],dest[idx+54],dest[idx+55]);
Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+56],dest[idx+57],dest[idx+58],dest[idx+59],dest[idx+60],dest[idx+61],dest[idx+62],dest[idx+63]);
short version='\x00';
char unknown='\x00';
uint16_t number=0;
for(int j=14;j<18;j++){
//Dbprintf("%d",dest[idx+j]);
version <<=1;
if (dest[idx+j]) version |= 1;
}
for(int j=19;j<27;j++){
//Dbprintf("%d",dest[idx+j]);
unknown <<=1;
if (dest[idx+j]) unknown |= 1;
}
for(int j=37;j<45;j++){
//Dbprintf("%d",dest[idx+j]);
number <<=1;
if (dest[idx+j]) number |= 1;
}
for(int j=46;j<53;j++){
//Dbprintf("%d",dest[idx+j]);
number <<=1;
if (dest[idx+j]) number |= 1;
}
code = bytebits_to_byte(dest+idx,32);
code2 = bytebits_to_byte(dest+idx+32,32);
for(int j=0; j<32; j++){
code <<=1;
if(dest[idx+j]) code |= 1;
}
for(int j=32; j<64; j++){
code2 <<=1;
if(dest[idx+j]) code2 |= 1;
}
short version = bytebits_to_byte(dest+idx+14,4);
char unknown = bytebits_to_byte(dest+idx+19,8) ;
uint16_t number = bytebits_to_byte(dest+idx+36,9);
Dbprintf("XSF(%02d)%02x:%d (%08x%08x)",version,unknown,number,code,code2);
if (ledcontrol)
LED_D_OFF();
}
if (ledcontrol) LED_D_OFF();
// if we're only looking for one tag
if (findone){
LED_A_OFF();
return;
}
found=0;
}
}
}
WDT_HIT();
}
DbpString("Stopped");
if (ledcontrol) LED_A_OFF();
}
/*------------------------------