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proxmark3/armsrc/felica.c

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#include "proxmark3.h"
#include "apps.h"
#include "BigBuf.h"
#include "util.h"
#include "usb_cdc.h" // for usb_poll_validate_length
#include "protocols.h"
//random service RW: 0x0009
//random service RO: 0x000B
//structure to hold outgoing NFC frame
static uint8_t frameSpace[MAX_FRAME_SIZE+4];
//structure to hold incoming NFC frame, used for ISO/IEC 18092-compatible frames
static struct {
enum {
STATE_UNSYNCD,
STATE_TRYING_SYNC,
STATE_GET_LENGTH,
STATE_GET_DATA,
STATE_GET_CRC,
STATE_FULL
} state;
uint16_t shiftReg; //for synchronization and offset calculation
int posCnt;
uint8_t crc_ok;
int rem_len;
uint16_t len;
uint8_t byte_offset;
uint16_t rolling_crc;
uint8_t framebytes[260]; //should be enough. maxlen is 255, 254 for data, 2 for sync, 2 for crc
// 0,1 -> SYNC, 2 - len, 3-(len+1)->data, then crc
} NFCFrame;
//b2 4d is SYNC, 45645 in 16-bit notation, 10110010 01001101 binary. Frame will not start filling until this is shifted in
//bit order in byte -reverse, I guess? [((bt>>0)&1),((bt>>1)&1),((bt>>2)&1),((bt>>3)&1),((bt>>4)&1),((bt>>5)&1),((bt>>6)&1),((bt>>7)&1)] -at least in the mode that I read those in
# define SYNC_16BIT 45645
static void ResetNFCFrame() {
NFCFrame.state = STATE_UNSYNCD;
NFCFrame.posCnt = 0;
NFCFrame.crc_ok = 0;
NFCFrame.byte_offset = 0;
NFCFrame.rolling_crc = 0;
}
//shift byte into frame, reversing it at the same time
static void shiftInByte(uint8_t bt) {
for(int j=0; j < NFCFrame.byte_offset; j++) {
NFCFrame.framebytes[NFCFrame.posCnt] = ( NFCFrame.framebytes[NFCFrame.posCnt]<<1 ) + (bt & 1);
bt >>= 1;
}
NFCFrame.posCnt++;
NFCFrame.rem_len--;
for(int j = NFCFrame.byte_offset; j<8; j++) {
NFCFrame.framebytes[NFCFrame.posCnt] = (NFCFrame.framebytes[NFCFrame.posCnt]<<1 ) + (bt & 1);
bt >>= 1;
}
}
//crc table - from lammertb/libcrc
static uint16_t crc_tabccitt[256];
static uint8_t crc_tabccitt_init = 0;
static void init_crcccitt_tab( void ) {
uint16_t i, j, crc, c;
for (i=0; i<256; i++) {
crc = 0;
c = i << 8;
for (j=0; j<8; j++) {
if ( (crc ^ c) & 0x8000 )
crc = ( crc << 1 ) ^ 0x1021;
else
crc = crc << 1;
c = c << 1;
}
crc_tabccitt[i] = crc;
}
crc_tabccitt_init = true;
}
static uint16_t update_crc_ccitt( uint16_t crc, unsigned char c ) {
return (crc << 8) ^ crc_tabccitt[ ((crc >> 8) ^ (uint16_t) c) & 0x00FF ];
}
void SetcrcToFrame(uint8_t * framebf) {
//expect framebuf to be preset with len...
uint16_t crc = 0;
for (int i=2; i < 2 + framebf[2]; i++) {
crc = update_crc_ccitt(crc, framebf[i]);
}
framebf[2 + framebf[2]] = (crc >> 8);
framebf[3 + framebf[2]] = (crc & 0xff);
}
static void ProcessNFCByte(uint8_t bt) {
switch (NFCFrame.state) {
case STATE_UNSYNCD: {
//almost any nonzero byte can be start of SYNC. SYNC should be preceded by zeros, but that is not alsways the case
if (bt > 0) {
NFCFrame.shiftReg = reflect(bt, 8);
NFCFrame.state = STATE_TRYING_SYNC;
}
break;
}
case STATE_TRYING_SYNC: {
if (bt == 0) {
//desync
NFCFrame.shiftReg = bt;
NFCFrame.state = STATE_UNSYNCD;
} else {
for (int i=0; i<8; i++) {
if (NFCFrame.shiftReg == SYNC_16BIT) {
//SYNC done!
NFCFrame.state = STATE_GET_LENGTH;
NFCFrame.framebytes[0] = 0xb2;
NFCFrame.framebytes[1] = 0x4d; //write SYNC
NFCFrame.byte_offset = i;
//shift in remaining byte, slowly...
for(int j=i; j<8; j++) {
NFCFrame.framebytes[2] = (NFCFrame.framebytes[2] << 1) + (bt & 1);
bt >>= 1;
}
NFCFrame.posCnt = 2;
if (i==0)
break;
}
NFCFrame.shiftReg = (NFCFrame.shiftReg << 1) + (bt & 1);
bt >>= 1;
}
//that byte was last byte of sync
if (NFCFrame.shiftReg == SYNC_16BIT) {
//Force SYNC on next byte
NFCFrame.state = STATE_GET_LENGTH;
NFCFrame.framebytes[0] = 0xb2;
NFCFrame.framebytes[1] = 0x4d;
NFCFrame.byte_offset = 0;
NFCFrame.posCnt = 1;
}
}
break;
}
case STATE_GET_LENGTH: {
shiftInByte(bt);
NFCFrame.rem_len = NFCFrame.framebytes[2] - 1;
NFCFrame.rolling_crc = update_crc_ccitt(0, NFCFrame.framebytes[2]); //start calculating CRC for later
NFCFrame.len = NFCFrame.framebytes[2] + 4; //with crc and sync
NFCFrame.state = STATE_GET_DATA;
break;
}
case STATE_GET_DATA: {
shiftInByte(bt);
if (NFCFrame.byte_offset != 0)
NFCFrame.rolling_crc = update_crc_ccitt(NFCFrame.rolling_crc, NFCFrame.framebytes[NFCFrame.posCnt-1] );
else
NFCFrame.rolling_crc = update_crc_ccitt(NFCFrame.rolling_crc, NFCFrame.framebytes[NFCFrame.posCnt]);
if (NFCFrame.rem_len <= 0) {
NFCFrame.state = STATE_GET_CRC;
NFCFrame.rem_len = 2;
}
break;
}
case STATE_GET_CRC: {
shiftInByte(bt);
if ( NFCFrame.rem_len <= 0 ) {
NFCFrame.crc_ok = ((NFCFrame.rolling_crc & 0xff) == NFCFrame.framebytes[NFCFrame.len-1] && (NFCFrame.rolling_crc >> 8) == NFCFrame.framebytes[NFCFrame.len-2]);
NFCFrame.state = STATE_FULL;
NFCFrame.rem_len = 0;
}
break;
}
case STATE_FULL: //ignore byte. Don't forget to clear frame to receive next one...
default:
break;
}
}
void HfSnoopISO18(uint32_t samplesToSkip, uint32_t triggersToSkip) {
if (!crc_tabccitt_init)
init_crcccitt_tab();
int remFrames = (samplesToSkip) ? samplesToSkip : 0;
Dbprintf("Snoop FelicaLiteS: Getting first %d frames, Skipping %d triggers.\n", samplesToSkip, triggersToSkip);
LED_D_ON();
// Select correct configs
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// Set up the synchronous serial port
FpgaSetupSsc();
// connect Demodulated Signal to ADC:
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
BigBuf_free(); BigBuf_Clear_ext(false);
clear_trace();
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092|FPGA_HF_ISO18092_FLAG_NOMOD);
AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
SpinDelay(100);
//the frame bits are slow enough.
int n = BigBuf_max_traceLen() / sizeof(uint8_t); // take all memory
int numbts = 0;
uint8_t *dest = (uint8_t *)BigBuf_get_addr();
uint8_t *destend = dest + n-2;
ResetNFCFrame();
StartCountSspClk(); //for apx frame timing
uint32_t endframe = GetCountSspClk();
while (dest <= destend) {
WDT_HIT();
if( BUTTON_PRESS()) break;
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
uint8_t dist = (uint8_t)(AT91C_BASE_SSC->SSC_RHR);
ProcessNFCByte(dist);
//to be sure we are in frame
if (NFCFrame.state == STATE_GET_LENGTH) {
//length is after 48 (PRE)+16 (SYNC) - 64 ticks +maybe offset? not 100%
uint16_t distance = GetCountSspClk() - endframe - 64 + (NFCFrame.byte_offset > 0 ? (8-NFCFrame.byte_offset) : 0);
*dest = distance >> 8;
dest++;
*dest = (distance & 0xff);
dest++;
}
//crc NOT checked
if (NFCFrame.state == STATE_FULL) {
endframe = GetCountSspClk();
*dest = NFCFrame.crc_ok; //kind of wasteful
dest++;
for(int i=0; i < NFCFrame.len; i++) {
*dest = NFCFrame.framebytes[i];
dest++;
if (dest >= destend ) break;
}
remFrames--;
if (remFrames <= 0) break;
if (dest >= destend ) break;
numbts += NFCFrame.len;
ResetNFCFrame();
}
}
}
switch_off();
//reset framing
AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
set_tracelen(numbts);
Dbprintf("Felica sniffing done, tracelen: %i, use hf list felica for annotations", BigBuf_get_traceLen());
cmd_send(CMD_ACK,1, numbts,0,0,0);
}
// poll-0: 0xb2,0x4d,0x06,0x00,0xff,0xff,0x00,0x00,0x09,0x21,
// resp: 0xb2,0x4d,0x12,0x01,0x01,0x2e,0x3d,0x17,0x26,0x47,0x80,0x95,0x00,0xf1,0x00,0x00,0x00,0x01,0x43,0x00,0xb3,0x7f,
// poll-1 (reply with available system codes - NFC Tag3 specs, IIRC): 0xb2,0x4d,0x06,0x00,0xff,0xff,0x01,0x00,0x3a,0x10
// resp: 0xb2,0x4d,0x14,0x01, 0xXX,0xXX,0xXX,0xXX,0xXX,0xXX,0xXX,0xXX, 0x00,0xf1,0x00,0x00,0x00,0x01,0x43,0x00, 0x88,0xb4,0x0c,0xe2,
// page-req: 0xb2,0x4d,0x10,0x06, 0xXX,0xXX,0xXX,0xXX,0xXX,0xXX,0xXX,0xXX, 0x01, 0x0b,0x00, 0x01, 0x80,0x00, 0x2e,0xb3,
// page-req: 0x06, IDm(8), ServiceNum(1),Slist(2*num) BLocknum (1) BLockids(2-3*num)
// page-resp: 0xb2,0x4d,0x1d,0x07, 0xXX,0xXX,0xXX,0xXX,0xXX,0xXX,0xXX,0xXX, 0x00, 0x00, 0x01, 0x10,0x04,0x01,0x00,0x0d,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x23, 0xcb,0x6e,
//builds a readblock frame for felica lite(s). Felica standart has a different file system, AFAIK
// 8-byte ndef, number of blocks, blocks numbers
// number of blocks limited to 4 for FelicaLite(S)
static void BuildFliteRdblk(uint8_t* ndef, int blocknum,uint16_t * blocks ) {
if (blocknum > 4 || blocknum <= 0)
Dbprintf("Invalid number of blocks, %d. Up to 4 are allowed.", blocknum);
int c = 0, i = 0;
frameSpace[c++] = 0xb2;
frameSpace[c++] = 0x4d;
c++; //set length later
frameSpace[c++] = FELICA_RDBLK_REQ; //command number
for (i=0; i <8; i++) //card IDm, from poll
frameSpace[c++] = ndef[i];
frameSpace[c++]= 0x01; //number of services
frameSpace[c++]= (uint8_t)(((uint16_t)FLITE_SERVICE_RO)&0xff);//service code -big endian?
frameSpace[c++]= (uint8_t)(((uint16_t)FLITE_SERVICE_RO)>>8);
frameSpace[c++]= blocknum; //number of blocks
for (i=0; i < blocknum; i++) {
//3-byte block
if (blocks[i] >= 256) {
frameSpace[c++] = 0x00;
frameSpace[c++] = (blocks[i] >> 8); //block number, little endian....
frameSpace[c++] = (blocks[i] & 0xff);
} else {
frameSpace[c++] = 0x80;
frameSpace[c++] = blocks[i];
}
}
frameSpace[2] = c-2; //set length
SetcrcToFrame(frameSpace);
}
//legacy, technically.
static int manch_tbl_fill = 0;
static uint8_t manch_tbl[16] = {0};
static void fillManch() {
for(uint8_t obs = 0; obs < 16; obs++) {
uint8_t res = 0;
uint8_t tmp = obs << 4;
for(int j=0; j<4; j++) {
res <<= 2;
if (tmp & 0x80)
res += 2;
else
res += 1;
tmp <<= 1;
}
manch_tbl[obs] = res;
}
manch_tbl_fill = 1;
}
static void TransmitFor18092_AsReader(uint8_t * frame, int len, uint32_t waitTill, uint8_t power, uint8_t highspeed) {
if (!manch_tbl_fill)
fillManch();
volatile uint32_t b;
int c;
uint32_t ThisTransferTime = 0;
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 | (power ? FPGA_HF_ISO18092_FLAG_READER : 0) | ( highspeed ? FPGA_HF_ISO18092_FLAG_424K : 0) );
if (power)
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 | FPGA_HF_ISO18092_FLAG_READER | (highspeed > 0) );
else
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 );
if (waitTill > 0) {
while( (ThisTransferTime = GetCountSspClk()) < waitTill)
WDT_HIT();
}
//preamble
for (c = 0; c < 6;) {
if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = 0x00;
c++;
}
if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
b = (uint16_t)(AT91C_BASE_SSC->SSC_RHR); (void)b;
}
}
for (c = 0; c < len;) {
if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = frame[c];
c++;
}
if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
b = (uint16_t)(AT91C_BASE_SSC->SSC_RHR); (void)b;
}
}
while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) {};
AT91C_BASE_SSC->SSC_THR = 0x00; //minimum delay
while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) {};
AT91C_BASE_SSC->SSC_THR = 0x00; //spin
//disable
if (power)
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 |FPGA_HF_ISO18092_FLAG_READER | 1);
else
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 | 1 );
}
#define R_POLL0_LEN 0x16
#define R_POLL1_LEN 0x18
#define R_READBLK_LEN 0x21
//simulate NFC Tag3 card - for now only poll response works
// second half (4 bytes) of NDEF2 goes into nfcid2_0, first into nfcid2_1
void HfSimLite( uint64_t nfcid) {
if (!crc_tabccitt_init)
init_crcccitt_tab();
if (!manch_tbl_fill)
fillManch();
int i, curlen = 0;
uint8_t *curresp = 0;
uint8_t ndef[8];
num_to_bytes(nfcid, 8, ndef);
//prepare our 3 responses...
uint8_t resp_poll0[R_POLL0_LEN] = { 0xb2,0x4d,0x12,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xf1,0x00,0x00,0x00,0x01,0x43,0x00,0xb3,0x7f};
uint8_t resp_poll1[R_POLL1_LEN] = { 0xb2,0x4d,0x14,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xf1,0x00,0x00,0x00,0x01,0x43,0x00, 0x88,0xb4,0xb3,0x7f};
uint8_t resp_readblk[R_READBLK_LEN] = { 0xb2,0x4d,0x1d,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x10,0x04,0x01,0x00,0x0d,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x23,0xcb,0x6e};
//NFC tag 3/ ISo technically. Many overlapping standards
DbpString("Felica Lite-S sim start");
Dbprintf("NDEF2 UID: %02x %02x %02x %02x %02x %02x %02x %02x",
ndef[0], ndef[1], ndef[2], ndef[3],
ndef[4], ndef[5], ndef[6], ndef[7]
);
//fill in blanks
for( i=0; i<8; i++) {
resp_poll0[i+4] = ndef[i];
resp_poll1[i+4] = ndef[i];
resp_readblk[i+4] = ndef[i];
}
//calculate and set CRC
SetcrcToFrame(resp_poll0);
SetcrcToFrame(resp_poll1);
SetcrcToFrame(resp_readblk);
// Select correct configs
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// Set up the synchronous serial port
FpgaSetupSsc();
// connect Demodulated Signal to ADC:
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 | FPGA_HF_ISO18092_FLAG_NOMOD);
SpinDelay(100);
//it might be possible to use MSB?
AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
ResetNFCFrame();
StartCountSspClk(); // should work without now, this is mostly for debugging
bool listenmode = true;
uint32_t frtm = GetCountSspClk();
for(;;) {
WDT_HIT();
if (listenmode) {
//waiting for request...
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
uint8_t dist = (uint8_t)(AT91C_BASE_SSC->SSC_RHR);
frtm = GetCountSspClk();
ProcessNFCByte(dist);
if (NFCFrame.state==STATE_FULL) {
if (NFCFrame.crc_ok) {
if (NFCFrame.framebytes[2] == 6 && NFCFrame.framebytes[3] == 0) {
//polling... there are two types of polling we answer to
if (NFCFrame.framebytes[6] == 0) {
curresp = resp_poll0;
curlen = R_POLL0_LEN;
listenmode = false;
}
if (NFCFrame.framebytes[6]==1) {
curresp = resp_poll1;
curlen = R_POLL1_LEN;
listenmode = true;
}
}
if (NFCFrame.framebytes[2] > 5 && NFCFrame.framebytes[3] == 0x06) {
//we should rebuild it depending on page size, but...
//Let's see first
curresp = resp_readblk;
curlen = R_READBLK_LEN;
listenmode = false;
}
//clear frame
ResetNFCFrame();
} else {
//frame invalid, clear it out to allow for the next one
ResetNFCFrame();
}
}
}
}
if (!listenmode) {
//trying to answer... here to start answering immediately.
//this one is a bit finicky. Seems that being a bit late is better than earlier
TransmitFor18092_AsReader(curresp, curlen, frtm+512, 0, 0);
//switch back
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 | FPGA_HF_ISO18092_FLAG_NOMOD);
ResetNFCFrame();
listenmode = true;
curlen = 0;
curresp = NULL;
}
if( BUTTON_PRESS()) break;
}
switch_off();
DbpString("Felica Lite-S sim end");
}
int WaitForFelicaReply(int maxbytes) {
int bcnt = 0;
ResetNFCFrame();
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 | FPGA_HF_ISO18092_FLAG_NOMOD | FPGA_HF_ISO18092_FLAG_READER);
for (; bcnt < maxbytes; ) {
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
uint8_t dist = (uint8_t)(AT91C_BASE_SSC->SSC_RHR);
ProcessNFCByte(dist);
bcnt++;
if (NFCFrame.state == STATE_FULL) {
if (NFCFrame.crc_ok) {
return 1;
} else {
Dbprintf("Got frame %d with wrong crc, crc %02x %02x"
, NFCFrame.framebytes[3]
, (NFCFrame.rolling_crc & 0xff)
, (NFCFrame.rolling_crc >> 8)
);
Dbhexdump(25, NFCFrame.framebytes, false);
return 0;
}
break ;
}
}
}
return 0;
}
void HfDumpFelicaLiteS() {
// setup device.
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// connect Demodulated Signal to ADC:
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
// Set up the synchronous serial port
FpgaSetupSsc();
// allocate command receive buffer
BigBuf_free(); BigBuf_Clear_ext(false);
LED_D_ON();
uint8_t ndef[8];
uint8_t poll[10] = { 0xb2,0x4d,0x06,0x00,0xff,0xff,0x00,0x00,0x09,0x21};
uint16_t liteblks[28] = {0x00, 0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x90,0x91,0x92,0xa0};
if (!crc_tabccitt_init)
init_crcccitt_tab();
if (!manch_tbl_fill)
fillManch();
ResetNFCFrame();
FpgaWriteConfWord(FPGA_MAJOR_MODE_ISO18092 | FPGA_HF_ISO18092_FLAG_READER |FPGA_HF_ISO18092_FLAG_NOMOD);
AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
SpinDelay(100);
// Start the timer
StartCountSspClk();
int c;
bool isOK = false;
uint16_t cnt = 0, cntfails = 0;
uint8_t *dest = (uint8_t *)BigBuf_get_addr();
while (!BUTTON_PRESS() && !usb_poll_validate_length()) {
WDT_HIT();
TransmitFor18092_AsReader(poll, 10, GetCountSspClk()+8, 1, 0);
if (WaitForFelicaReply(512) && NFCFrame.framebytes[3] == FELICA_POLL_ACK) {
for (c=0; c < 8; c++)
ndef[c] = NFCFrame.framebytes[c+4];
for (c=0; c < 28;) {
BuildFliteRdblk(ndef, 1, &liteblks[c]);
TransmitFor18092_AsReader(frameSpace, frameSpace[2]+4, GetCountSspClk()+8, 1, 0);
if (WaitForFelicaReply(1024) && NFCFrame.framebytes[3] == FELICA_RDBLK_ACK) {
dest[cnt++] = liteblks[c];
uint8_t * fb = NFCFrame.framebytes;
dest[cnt++] = fb[12];
dest[cnt++] = fb[13];
for(uint8_t j=0; j < 16; j++)
dest[cnt++] = fb[15+j];
c++;
cntfails = 0;
} else {
cntfails++;
if (cntfails > 12) {
c++;
cntfails = 0;
}
}
}
isOK = true;
break;
}
}
switch_off();
//Resetting Frame mode (First set in fpgaloader.c)
AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
//setting tracelen - important! it was set by buffer overflow before
set_tracelen(cnt);
cmd_send(CMD_ACK, isOK, cnt, 0, 0, 0);
}
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