mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-11 10:14:34 +08:00
1239 lines
39 KiB
C
1239 lines
39 KiB
C
//-----------------------------------------------------------------------------
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// Jonathan Westhues, split Nov 2006
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Routines to support ISO 14443. This includes both the reader software and
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// the `fake tag' modes. At the moment only the Type B modulation is
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// supported.
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//-----------------------------------------------------------------------------
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#include "../include/proxmark3.h"
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#include "apps.h"
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#include "util.h"
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#include "string.h"
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#include "../common/iso14443crc.h"
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//static void GetSamplesFor14443(int weTx, int n);
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#define DEMOD_TRACE_SIZE 4096
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#define READER_TAG_BUFFER_SIZE 2048
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#define TAG_READER_BUFFER_SIZE 2048
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#define DEMOD_DMA_BUFFER_SIZE 1024
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//=============================================================================
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// An ISO 14443 Type B tag. We listen for commands from the reader, using
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// a UART kind of thing that's implemented in software. When we get a
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// frame (i.e., a group of bytes between SOF and EOF), we check the CRC.
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// If it's good, then we can do something appropriate with it, and send
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// a response.
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//=============================================================================
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//-----------------------------------------------------------------------------
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// Code up a string of octets at layer 2 (including CRC, we don't generate
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// that here) so that they can be transmitted to the reader. Doesn't transmit
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// them yet, just leaves them ready to send in ToSend[].
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//-----------------------------------------------------------------------------
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static void CodeIso14443bAsTag(const uint8_t *cmd, int len)
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{
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int i;
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ToSendReset();
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// Transmit a burst of ones, as the initial thing that lets the
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// reader get phase sync. This (TR1) must be > 80/fs, per spec,
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// but tag that I've tried (a Paypass) exceeds that by a fair bit,
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// so I will too.
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for(i = 0; i < 20; i++) {
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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}
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// Send SOF.
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for(i = 0; i < 10; i++) {
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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}
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for(i = 0; i < 2; i++) {
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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}
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for(i = 0; i < len; i++) {
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int j;
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uint8_t b = cmd[i];
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// Start bit
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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// Data bits
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for(j = 0; j < 8; j++) {
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if(b & 1) {
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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} else {
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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}
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b >>= 1;
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}
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// Stop bit
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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}
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// Send SOF.
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for(i = 0; i < 10; i++) {
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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ToSendStuffBit(0);
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}
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for(i = 0; i < 10; i++) {
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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ToSendStuffBit(1);
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}
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// Convert from last byte pos to length
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ToSendMax++;
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// Add a few more for slop
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ToSendMax += 2;
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}
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//-----------------------------------------------------------------------------
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// The software UART that receives commands from the reader, and its state
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// variables.
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//-----------------------------------------------------------------------------
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static struct {
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enum {
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STATE_UNSYNCD,
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STATE_GOT_FALLING_EDGE_OF_SOF,
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STATE_AWAITING_START_BIT,
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STATE_RECEIVING_DATA,
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STATE_ERROR_WAIT
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} state;
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uint16_t shiftReg;
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int bitCnt;
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int byteCnt;
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int byteCntMax;
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int posCnt;
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uint8_t *output;
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} Uart;
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/* Receive & handle a bit coming from the reader.
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*
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* LED handling:
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* LED A -> ON once we have received the SOF and are expecting the rest.
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* LED A -> OFF once we have received EOF or are in error state or unsynced
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*
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* Returns: true if we received a EOF
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* false if we are still waiting for some more
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*/
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static int Handle14443UartBit(int bit)
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{
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switch(Uart.state) {
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case STATE_UNSYNCD:
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LED_A_OFF();
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if(!bit) {
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// we went low, so this could be the beginning
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// of an SOF
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Uart.state = STATE_GOT_FALLING_EDGE_OF_SOF;
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Uart.posCnt = 0;
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Uart.bitCnt = 0;
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}
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break;
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case STATE_GOT_FALLING_EDGE_OF_SOF:
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Uart.posCnt++;
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if(Uart.posCnt == 2) {
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if(bit) {
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if(Uart.bitCnt >= 10) {
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// we've seen enough consecutive
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// zeros that it's a valid SOF
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Uart.posCnt = 0;
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Uart.byteCnt = 0;
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Uart.state = STATE_AWAITING_START_BIT;
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LED_A_ON(); // Indicate we got a valid SOF
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} else {
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// didn't stay down long enough
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// before going high, error
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Uart.state = STATE_ERROR_WAIT;
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}
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} else {
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// do nothing, keep waiting
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}
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Uart.bitCnt++;
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}
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if(Uart.posCnt >= 4) Uart.posCnt = 0;
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if(Uart.bitCnt > 14) {
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// Give up if we see too many zeros without
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// a one, too.
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Uart.state = STATE_ERROR_WAIT;
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}
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break;
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case STATE_AWAITING_START_BIT:
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Uart.posCnt++;
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if(bit) {
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if(Uart.posCnt > 25) {
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// stayed high for too long between
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// characters, error
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Uart.state = STATE_ERROR_WAIT;
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}
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} else {
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// falling edge, this starts the data byte
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Uart.posCnt = 0;
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Uart.bitCnt = 0;
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Uart.shiftReg = 0;
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Uart.state = STATE_RECEIVING_DATA;
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LED_A_ON(); // Indicate we're receiving
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}
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break;
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case STATE_RECEIVING_DATA:
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Uart.posCnt++;
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if(Uart.posCnt == 2) {
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// time to sample a bit
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Uart.shiftReg >>= 1;
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if(bit) {
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Uart.shiftReg |= 0x200;
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}
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Uart.bitCnt++;
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}
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if(Uart.posCnt >= 4) {
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Uart.posCnt = 0;
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}
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if(Uart.bitCnt == 10) {
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if((Uart.shiftReg & 0x200) && !(Uart.shiftReg & 0x001))
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{
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// this is a data byte, with correct
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// start and stop bits
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Uart.output[Uart.byteCnt] = (Uart.shiftReg >> 1) & 0xff;
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Uart.byteCnt++;
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if(Uart.byteCnt >= Uart.byteCntMax) {
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// Buffer overflowed, give up
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Uart.posCnt = 0;
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Uart.state = STATE_ERROR_WAIT;
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} else {
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// so get the next byte now
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Uart.posCnt = 0;
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Uart.state = STATE_AWAITING_START_BIT;
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}
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} else if(Uart.shiftReg == 0x000) {
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// this is an EOF byte
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LED_A_OFF(); // Finished receiving
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return TRUE;
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} else {
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// this is an error
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Uart.posCnt = 0;
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Uart.state = STATE_ERROR_WAIT;
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}
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}
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break;
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case STATE_ERROR_WAIT:
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// We're all screwed up, so wait a little while
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// for whatever went wrong to finish, and then
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// start over.
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Uart.posCnt++;
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if(Uart.posCnt > 10) {
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Uart.state = STATE_UNSYNCD;
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}
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break;
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default:
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Uart.state = STATE_UNSYNCD;
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break;
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}
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// This row make the error blew circular buffer in hf 14b snoop
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//if (Uart.state == STATE_ERROR_WAIT) LED_A_OFF(); // Error
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return FALSE;
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}
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//-----------------------------------------------------------------------------
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// Receive a command (from the reader to us, where we are the simulated tag),
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// and store it in the given buffer, up to the given maximum length. Keeps
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// spinning, waiting for a well-framed command, until either we get one
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// (returns TRUE) or someone presses the pushbutton on the board (FALSE).
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//
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// Assume that we're called with the SSC (to the FPGA) and ADC path set
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// correctly.
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//-----------------------------------------------------------------------------
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static int GetIso14443CommandFromReader(uint8_t *received, int *len, int maxLen)
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{
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uint8_t mask;
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int i, bit;
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// Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
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// only, since we are receiving, not transmitting).
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// Signal field is off with the appropriate LED
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LED_D_OFF();
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FpgaWriteConfWord(
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FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
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// Now run a `software UART' on the stream of incoming samples.
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Uart.output = received;
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Uart.byteCntMax = maxLen;
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Uart.state = STATE_UNSYNCD;
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for(;;) {
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WDT_HIT();
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if(BUTTON_PRESS()) return FALSE;
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if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
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AT91C_BASE_SSC->SSC_THR = 0x00;
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}
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if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
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uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
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mask = 0x80;
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for(i = 0; i < 8; i++, mask >>= 1) {
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bit = (b & mask);
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if(Handle14443UartBit(bit)) {
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*len = Uart.byteCnt;
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return TRUE;
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}
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}
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}
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}
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}
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//-----------------------------------------------------------------------------
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// Main loop of simulated tag: receive commands from reader, decide what
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// response to send, and send it.
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//-----------------------------------------------------------------------------
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void SimulateIso14443Tag(void)
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{
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static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
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static const uint8_t response1[] = {
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0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19, 0x22,
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0x00, 0x21, 0x85, 0x5e, 0xd7
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};
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uint8_t *resp;
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int respLen;
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uint8_t *resp1 = (((uint8_t *)BigBuf) + 800);
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int resp1Len;
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uint8_t *receivedCmd = (uint8_t *)BigBuf;
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int len;
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int i;
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int cmdsRecvd = 0;
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FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
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memset(receivedCmd, 0x44, 400);
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CodeIso14443bAsTag(response1, sizeof(response1));
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memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
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// We need to listen to the high-frequency, peak-detected path.
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SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
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FpgaSetupSsc();
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cmdsRecvd = 0;
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for(;;) {
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uint8_t b1, b2;
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if(!GetIso14443CommandFromReader(receivedCmd, &len, 100)) {
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Dbprintf("button pressed, received %d commands", cmdsRecvd);
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break;
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}
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// Good, look at the command now.
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if(len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len)==0) {
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resp = resp1; respLen = resp1Len;
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} else {
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Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd);
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// And print whether the CRC fails, just for good measure
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ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
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if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
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// Not so good, try again.
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DbpString("+++CRC fail");
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} else {
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DbpString("CRC passes");
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}
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break;
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}
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memset(receivedCmd, 0x44, 32);
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cmdsRecvd++;
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if(cmdsRecvd > 0x30) {
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DbpString("many commands later...");
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break;
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}
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if(respLen <= 0) continue;
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// Modulate BPSK
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// Signal field is off with the appropriate LED
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LED_D_OFF();
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FpgaWriteConfWord(
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FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK);
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AT91C_BASE_SSC->SSC_THR = 0xff;
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FpgaSetupSsc();
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// Transmit the response.
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i = 0;
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for(;;) {
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if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
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uint8_t b = resp[i];
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AT91C_BASE_SSC->SSC_THR = b;
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i++;
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if(i > respLen) {
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break;
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}
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}
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if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
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volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
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(void)b;
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}
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}
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}
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}
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//=============================================================================
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// An ISO 14443 Type B reader. We take layer two commands, code them
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// appropriately, and then send them to the tag. We then listen for the
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// tag's response, which we leave in the buffer to be demodulated on the
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// PC side.
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//=============================================================================
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static struct {
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enum {
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DEMOD_UNSYNCD,
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DEMOD_PHASE_REF_TRAINING,
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DEMOD_AWAITING_FALLING_EDGE_OF_SOF,
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DEMOD_GOT_FALLING_EDGE_OF_SOF,
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DEMOD_AWAITING_START_BIT,
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DEMOD_RECEIVING_DATA,
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DEMOD_ERROR_WAIT
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} state;
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int bitCount;
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int posCount;
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int thisBit;
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int metric;
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int metricN;
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uint16_t shiftReg;
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uint8_t *output;
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int len;
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int sumI;
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int sumQ;
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} Demod;
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/*
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* Handles reception of a bit from the tag
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*
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* LED handling:
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* LED C -> ON once we have received the SOF and are expecting the rest.
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* LED C -> OFF once we have received EOF or are unsynced
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*
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* Returns: true if we received a EOF
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* false if we are still waiting for some more
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*
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*/
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static RAMFUNC int Handle14443SamplesDemod(int ci, int cq)
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{
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int v;
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// The soft decision on the bit uses an estimate of just the
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// quadrant of the reference angle, not the exact angle.
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#define MAKE_SOFT_DECISION() { \
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if(Demod.sumI > 0) { \
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v = ci; \
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} else { \
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v = -ci; \
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} \
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if(Demod.sumQ > 0) { \
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v += cq; \
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} else { \
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v -= cq; \
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} \
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}
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switch(Demod.state) {
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case DEMOD_UNSYNCD:
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v = ci;
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if(v < 0) v = -v;
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if(cq > 0) {
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v += cq;
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} else {
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v -= cq;
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}
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if(v > 40) {
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Demod.posCount = 0;
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Demod.state = DEMOD_PHASE_REF_TRAINING;
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Demod.sumI = 0;
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Demod.sumQ = 0;
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}
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break;
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case DEMOD_PHASE_REF_TRAINING:
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if(Demod.posCount < 8) {
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Demod.sumI += ci;
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Demod.sumQ += cq;
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} else if(Demod.posCount > 100) {
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// error, waited too long
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Demod.state = DEMOD_UNSYNCD;
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} else {
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MAKE_SOFT_DECISION();
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if(v < 0) {
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Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF;
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Demod.posCount = 0;
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}
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}
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Demod.posCount++;
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break;
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case DEMOD_AWAITING_FALLING_EDGE_OF_SOF:
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MAKE_SOFT_DECISION();
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if(v < 0) {
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Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
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Demod.posCount = 0;
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} else {
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if(Demod.posCount > 100) {
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Demod.state = DEMOD_UNSYNCD;
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}
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}
|
|
Demod.posCount++;
|
|
break;
|
|
|
|
case DEMOD_GOT_FALLING_EDGE_OF_SOF:
|
|
MAKE_SOFT_DECISION();
|
|
if(v > 0) {
|
|
if(Demod.posCount < 12) {
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
} else {
|
|
LED_C_ON(); // Got SOF
|
|
Demod.state = DEMOD_AWAITING_START_BIT;
|
|
Demod.posCount = 0;
|
|
Demod.len = 0;
|
|
Demod.metricN = 0;
|
|
Demod.metric = 0;
|
|
}
|
|
} else {
|
|
if(Demod.posCount > 100) {
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
}
|
|
}
|
|
Demod.posCount++;
|
|
break;
|
|
|
|
case DEMOD_AWAITING_START_BIT:
|
|
MAKE_SOFT_DECISION();
|
|
if(v > 0) {
|
|
if(Demod.posCount > 10) {
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
}
|
|
} else {
|
|
Demod.bitCount = 0;
|
|
Demod.posCount = 1;
|
|
Demod.thisBit = v;
|
|
Demod.shiftReg = 0;
|
|
Demod.state = DEMOD_RECEIVING_DATA;
|
|
}
|
|
break;
|
|
|
|
case DEMOD_RECEIVING_DATA:
|
|
MAKE_SOFT_DECISION();
|
|
if(Demod.posCount == 0) {
|
|
Demod.thisBit = v;
|
|
Demod.posCount = 1;
|
|
} else {
|
|
Demod.thisBit += v;
|
|
|
|
if(Demod.thisBit > 0) {
|
|
Demod.metric += Demod.thisBit;
|
|
} else {
|
|
Demod.metric -= Demod.thisBit;
|
|
}
|
|
(Demod.metricN)++;
|
|
|
|
Demod.shiftReg >>= 1;
|
|
if(Demod.thisBit > 0) {
|
|
Demod.shiftReg |= 0x200;
|
|
}
|
|
|
|
Demod.bitCount++;
|
|
if(Demod.bitCount == 10) {
|
|
uint16_t s = Demod.shiftReg;
|
|
if((s & 0x200) && !(s & 0x001)) {
|
|
uint8_t b = (s >> 1);
|
|
Demod.output[Demod.len] = b;
|
|
Demod.len++;
|
|
Demod.state = DEMOD_AWAITING_START_BIT;
|
|
} else if(s == 0x000) {
|
|
// This is EOF
|
|
LED_C_OFF();
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
return TRUE;
|
|
} else {
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
}
|
|
}
|
|
Demod.posCount = 0;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
break;
|
|
}
|
|
|
|
if (Demod.state == DEMOD_UNSYNCD) LED_C_OFF(); // Not synchronized...
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* Demodulate the samples we received from the tag
|
|
* weTx: set to 'TRUE' if we behave like a reader
|
|
* set to 'FALSE' if we behave like a snooper
|
|
* quiet: set to 'TRUE' to disable debug output
|
|
*/
|
|
static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
|
|
{
|
|
int max = 0;
|
|
int gotFrame = FALSE;
|
|
|
|
//# define DMA_BUFFER_SIZE 8
|
|
int8_t *dmaBuf;
|
|
|
|
int lastRxCounter;
|
|
int8_t *upTo;
|
|
|
|
int ci, cq;
|
|
|
|
int samples = 0;
|
|
|
|
// Clear out the state of the "UART" that receives from the tag.
|
|
memset(BigBuf, 0x00, 400);
|
|
Demod.output = (uint8_t *)BigBuf;
|
|
Demod.len = 0;
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
|
|
// And the UART that receives from the reader
|
|
Uart.output = (((uint8_t *)BigBuf) + 1024);
|
|
Uart.byteCntMax = 100;
|
|
Uart.state = STATE_UNSYNCD;
|
|
|
|
// Setup for the DMA.
|
|
dmaBuf = (int8_t *)(BigBuf + 32);
|
|
upTo = dmaBuf;
|
|
lastRxCounter = DEMOD_DMA_BUFFER_SIZE;
|
|
FpgaSetupSscDma((uint8_t *)dmaBuf, DEMOD_DMA_BUFFER_SIZE);
|
|
|
|
// Signal field is ON with the appropriate LED:
|
|
if (weTx) LED_D_ON(); else LED_D_OFF();
|
|
// And put the FPGA in the appropriate mode
|
|
FpgaWriteConfWord(
|
|
FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
|
|
(weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP));
|
|
|
|
for(;;) {
|
|
int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR;
|
|
if(behindBy > max) max = behindBy;
|
|
|
|
while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (DEMOD_DMA_BUFFER_SIZE-1))
|
|
> 2)
|
|
{
|
|
ci = upTo[0];
|
|
cq = upTo[1];
|
|
upTo += 2;
|
|
if(upTo - dmaBuf > DEMOD_DMA_BUFFER_SIZE) {
|
|
upTo -= DEMOD_DMA_BUFFER_SIZE;
|
|
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
|
|
AT91C_BASE_PDC_SSC->PDC_RNCR = DEMOD_DMA_BUFFER_SIZE;
|
|
}
|
|
lastRxCounter -= 2;
|
|
if(lastRxCounter <= 0) {
|
|
lastRxCounter += DEMOD_DMA_BUFFER_SIZE;
|
|
}
|
|
|
|
samples += 2;
|
|
|
|
Handle14443UartBit(1);
|
|
Handle14443UartBit(1);
|
|
|
|
if(Handle14443SamplesDemod(ci, cq)) {
|
|
gotFrame = 1;
|
|
}
|
|
}
|
|
|
|
if(samples > 2000) {
|
|
break;
|
|
}
|
|
}
|
|
AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
|
|
if (!quiet) Dbprintf("%x %x %x", max, gotFrame, Demod.len);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Read the tag's response. We just receive a stream of slightly-processed
|
|
// samples from the FPGA, which we will later do some signal processing on,
|
|
// to get the bits.
|
|
//-----------------------------------------------------------------------------
|
|
/*static void GetSamplesFor14443(int weTx, int n)
|
|
{
|
|
uint8_t *dest = (uint8_t *)BigBuf;
|
|
int c;
|
|
|
|
FpgaWriteConfWord(
|
|
FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
|
|
(weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP));
|
|
|
|
c = 0;
|
|
for(;;) {
|
|
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
|
|
AT91C_BASE_SSC->SSC_THR = 0x43;
|
|
}
|
|
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
|
|
int8_t b;
|
|
b = (int8_t)AT91C_BASE_SSC->SSC_RHR;
|
|
|
|
dest[c++] = (uint8_t)b;
|
|
|
|
if(c >= n) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}*/
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Transmit the command (to the tag) that was placed in ToSend[].
|
|
//-----------------------------------------------------------------------------
|
|
static void TransmitFor14443(void)
|
|
{
|
|
int c;
|
|
|
|
FpgaSetupSsc();
|
|
|
|
while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
|
|
AT91C_BASE_SSC->SSC_THR = 0xff;
|
|
}
|
|
|
|
// Signal field is ON with the appropriate Red LED
|
|
LED_D_ON();
|
|
// Signal we are transmitting with the Green LED
|
|
LED_B_ON();
|
|
FpgaWriteConfWord(
|
|
FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
|
|
|
|
for(c = 0; c < 10;) {
|
|
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
|
|
AT91C_BASE_SSC->SSC_THR = 0xff;
|
|
c++;
|
|
}
|
|
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
|
|
volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
|
|
(void)r;
|
|
}
|
|
WDT_HIT();
|
|
}
|
|
|
|
c = 0;
|
|
for(;;) {
|
|
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
|
|
AT91C_BASE_SSC->SSC_THR = ToSend[c];
|
|
c++;
|
|
if(c >= ToSendMax) {
|
|
break;
|
|
}
|
|
}
|
|
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
|
|
volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
|
|
(void)r;
|
|
}
|
|
WDT_HIT();
|
|
}
|
|
LED_B_OFF(); // Finished sending
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Code a layer 2 command (string of octets, including CRC) into ToSend[],
|
|
// so that it is ready to transmit to the tag using TransmitFor14443().
|
|
//-----------------------------------------------------------------------------
|
|
static void CodeIso14443bAsReader(const uint8_t *cmd, int len)
|
|
{
|
|
int i, j;
|
|
uint8_t b;
|
|
|
|
ToSendReset();
|
|
|
|
// Establish initial reference level
|
|
for(i = 0; i < 40; i++) {
|
|
ToSendStuffBit(1);
|
|
}
|
|
// Send SOF
|
|
for(i = 0; i < 10; i++) {
|
|
ToSendStuffBit(0);
|
|
}
|
|
|
|
for(i = 0; i < len; i++) {
|
|
// Stop bits/EGT
|
|
ToSendStuffBit(1);
|
|
ToSendStuffBit(1);
|
|
// Start bit
|
|
ToSendStuffBit(0);
|
|
// Data bits
|
|
b = cmd[i];
|
|
for(j = 0; j < 8; j++) {
|
|
if(b & 1) {
|
|
ToSendStuffBit(1);
|
|
} else {
|
|
ToSendStuffBit(0);
|
|
}
|
|
b >>= 1;
|
|
}
|
|
}
|
|
// Send EOF
|
|
ToSendStuffBit(1);
|
|
for(i = 0; i < 10; i++) {
|
|
ToSendStuffBit(0);
|
|
}
|
|
for(i = 0; i < 8; i++) {
|
|
ToSendStuffBit(1);
|
|
}
|
|
|
|
// And then a little more, to make sure that the last character makes
|
|
// it out before we switch to rx mode.
|
|
for(i = 0; i < 24; i++) {
|
|
ToSendStuffBit(1);
|
|
}
|
|
|
|
// Convert from last character reference to length
|
|
ToSendMax++;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Read an ISO 14443 tag. We send it some set of commands, and record the
|
|
// responses.
|
|
// The command name is misleading, it actually decodes the reponse in HEX
|
|
// into the output buffer (read the result using hexsamples, not hisamples)
|
|
//
|
|
// obsolete function only for test
|
|
//-----------------------------------------------------------------------------
|
|
void AcquireRawAdcSamplesIso14443(uint32_t parameter)
|
|
{
|
|
uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
|
|
|
|
SendRawCommand14443B(sizeof(cmd1),1,1,cmd1);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Read a SRI512 ISO 14443 tag.
|
|
//
|
|
// SRI512 tags are just simple memory tags, here we're looking at making a dump
|
|
// of the contents of the memory. No anticollision algorithm is done, we assume
|
|
// we have a single tag in the field.
|
|
//
|
|
// I tried to be systematic and check every answer of the tag, every CRC, etc...
|
|
//-----------------------------------------------------------------------------
|
|
void ReadSTMemoryIso14443(uint32_t dwLast)
|
|
{
|
|
uint8_t i = 0x00;
|
|
|
|
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
|
|
// Make sure that we start from off, since the tags are stateful;
|
|
// confusing things will happen if we don't reset them between reads.
|
|
LED_D_OFF();
|
|
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
|
|
SpinDelay(200);
|
|
|
|
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
|
|
FpgaSetupSsc();
|
|
|
|
// Now give it time to spin up.
|
|
// Signal field is on with the appropriate LED
|
|
LED_D_ON();
|
|
FpgaWriteConfWord(
|
|
FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
|
|
SpinDelay(200);
|
|
|
|
// First command: wake up the tag using the INITIATE command
|
|
uint8_t cmd1[] = { 0x06, 0x00, 0x97, 0x5b};
|
|
CodeIso14443bAsReader(cmd1, sizeof(cmd1));
|
|
TransmitFor14443();
|
|
// LED_A_ON();
|
|
GetSamplesFor14443Demod(TRUE, 2000,TRUE);
|
|
// LED_A_OFF();
|
|
|
|
if (Demod.len == 0) {
|
|
DbpString("No response from tag");
|
|
return;
|
|
} else {
|
|
Dbprintf("Randomly generated UID from tag (+ 2 byte CRC): %x %x %x",
|
|
Demod.output[0], Demod.output[1],Demod.output[2]);
|
|
}
|
|
// There is a response, SELECT the uid
|
|
DbpString("Now SELECT tag:");
|
|
cmd1[0] = 0x0E; // 0x0E is SELECT
|
|
cmd1[1] = Demod.output[0];
|
|
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
|
|
CodeIso14443bAsReader(cmd1, sizeof(cmd1));
|
|
TransmitFor14443();
|
|
// LED_A_ON();
|
|
GetSamplesFor14443Demod(TRUE, 2000,TRUE);
|
|
// LED_A_OFF();
|
|
if (Demod.len != 3) {
|
|
Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
|
|
return;
|
|
}
|
|
// Check the CRC of the answer:
|
|
ComputeCrc14443(CRC_14443_B, Demod.output, 1 , &cmd1[2], &cmd1[3]);
|
|
if(cmd1[2] != Demod.output[1] || cmd1[3] != Demod.output[2]) {
|
|
DbpString("CRC Error reading select response.");
|
|
return;
|
|
}
|
|
// Check response from the tag: should be the same UID as the command we just sent:
|
|
if (cmd1[1] != Demod.output[0]) {
|
|
Dbprintf("Bad response to SELECT from Tag, aborting: %x %x", cmd1[1], Demod.output[0]);
|
|
return;
|
|
}
|
|
// Tag is now selected,
|
|
// First get the tag's UID:
|
|
cmd1[0] = 0x0B;
|
|
ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]);
|
|
CodeIso14443bAsReader(cmd1, 3); // Only first three bytes for this one
|
|
TransmitFor14443();
|
|
// LED_A_ON();
|
|
GetSamplesFor14443Demod(TRUE, 2000,TRUE);
|
|
// LED_A_OFF();
|
|
if (Demod.len != 10) {
|
|
Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
|
|
return;
|
|
}
|
|
// The check the CRC of the answer (use cmd1 as temporary variable):
|
|
ComputeCrc14443(CRC_14443_B, Demod.output, 8, &cmd1[2], &cmd1[3]);
|
|
if(cmd1[2] != Demod.output[8] || cmd1[3] != Demod.output[9]) {
|
|
Dbprintf("CRC Error reading block! - Below: expected, got %x %x",
|
|
(cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]);
|
|
// Do not return;, let's go on... (we should retry, maybe ?)
|
|
}
|
|
Dbprintf("Tag UID (64 bits): %08x %08x",
|
|
(Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4],
|
|
(Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]);
|
|
|
|
// Now loop to read all 16 blocks, address from 0 to last block
|
|
Dbprintf("Tag memory dump, block 0 to %d",dwLast);
|
|
cmd1[0] = 0x08;
|
|
i = 0x00;
|
|
dwLast++;
|
|
for (;;) {
|
|
if (i == dwLast) {
|
|
DbpString("System area block (0xff):");
|
|
i = 0xff;
|
|
}
|
|
cmd1[1] = i;
|
|
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
|
|
CodeIso14443bAsReader(cmd1, sizeof(cmd1));
|
|
TransmitFor14443();
|
|
// LED_A_ON();
|
|
GetSamplesFor14443Demod(TRUE, 2000,TRUE);
|
|
// LED_A_OFF();
|
|
if (Demod.len != 6) { // Check if we got an answer from the tag
|
|
DbpString("Expected 6 bytes from tag, got less...");
|
|
return;
|
|
}
|
|
// The check the CRC of the answer (use cmd1 as temporary variable):
|
|
ComputeCrc14443(CRC_14443_B, Demod.output, 4, &cmd1[2], &cmd1[3]);
|
|
if(cmd1[2] != Demod.output[4] || cmd1[3] != Demod.output[5]) {
|
|
Dbprintf("CRC Error reading block! - Below: expected, got %x %x",
|
|
(cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]);
|
|
// Do not return;, let's go on... (we should retry, maybe ?)
|
|
}
|
|
// Now print out the memory location:
|
|
Dbprintf("Address=%x, Contents=%x, CRC=%x", i,
|
|
(Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0],
|
|
(Demod.output[4]<<8)+Demod.output[5]);
|
|
if (i == 0xff) {
|
|
break;
|
|
}
|
|
i++;
|
|
}
|
|
}
|
|
|
|
|
|
//=============================================================================
|
|
// Finally, the `sniffer' combines elements from both the reader and
|
|
// simulated tag, to show both sides of the conversation.
|
|
//=============================================================================
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Record the sequence of commands sent by the reader to the tag, with
|
|
// triggering so that we start recording at the point that the tag is moved
|
|
// near the reader.
|
|
//-----------------------------------------------------------------------------
|
|
/*
|
|
* Memory usage for this function, (within BigBuf)
|
|
* 0-4095 : Demodulated samples receive (4096 bytes) - DEMOD_TRACE_SIZE
|
|
* 4096-6143 : Last Received command, 2048 bytes (reader->tag) - READER_TAG_BUFFER_SIZE
|
|
* 6144-8191 : Last Received command, 2048 bytes(tag->reader) - TAG_READER_BUFFER_SIZE
|
|
* 8192-9215 : DMA Buffer, 1024 bytes (samples) - DEMOD_DMA_BUFFER_SIZE
|
|
*/
|
|
void RAMFUNC SnoopIso14443(void)
|
|
{
|
|
// We won't start recording the frames that we acquire until we trigger;
|
|
// a good trigger condition to get started is probably when we see a
|
|
// response from the tag.
|
|
int triggered = TRUE;
|
|
|
|
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
|
|
// The command (reader -> tag) that we're working on receiving.
|
|
uint8_t *receivedCmd = (uint8_t *)(BigBuf) + DEMOD_TRACE_SIZE;
|
|
// The response (tag -> reader) that we're working on receiving.
|
|
uint8_t *receivedResponse = (uint8_t *)(BigBuf) + DEMOD_TRACE_SIZE + READER_TAG_BUFFER_SIZE;
|
|
|
|
// As we receive stuff, we copy it from receivedCmd or receivedResponse
|
|
// into trace, along with its length and other annotations.
|
|
uint8_t *trace = (uint8_t *)BigBuf;
|
|
int traceLen = 0;
|
|
|
|
// The DMA buffer, used to stream samples from the FPGA.
|
|
int8_t *dmaBuf = (int8_t *)(BigBuf) + DEMOD_TRACE_SIZE + READER_TAG_BUFFER_SIZE + TAG_READER_BUFFER_SIZE;
|
|
int lastRxCounter;
|
|
int8_t *upTo;
|
|
int ci, cq;
|
|
int maxBehindBy = 0;
|
|
|
|
// Count of samples received so far, so that we can include timing
|
|
// information in the trace buffer.
|
|
int samples = 0;
|
|
|
|
// Initialize the trace buffer
|
|
memset(trace, 0x44, DEMOD_TRACE_SIZE);
|
|
|
|
// Set up the demodulator for tag -> reader responses.
|
|
Demod.output = receivedResponse;
|
|
Demod.len = 0;
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
|
|
// And the reader -> tag commands
|
|
memset(&Uart, 0, sizeof(Uart));
|
|
Uart.output = receivedCmd;
|
|
Uart.byteCntMax = 100;
|
|
Uart.state = STATE_UNSYNCD;
|
|
|
|
// Print some debug information about the buffer sizes
|
|
Dbprintf("Snooping buffers initialized:");
|
|
Dbprintf(" Trace: %i bytes", DEMOD_TRACE_SIZE);
|
|
Dbprintf(" Reader -> tag: %i bytes", READER_TAG_BUFFER_SIZE);
|
|
Dbprintf(" tag -> Reader: %i bytes", TAG_READER_BUFFER_SIZE);
|
|
Dbprintf(" DMA: %i bytes", DEMOD_DMA_BUFFER_SIZE);
|
|
|
|
// And put the FPGA in the appropriate mode
|
|
// Signal field is off with the appropriate LED
|
|
LED_D_OFF();
|
|
FpgaWriteConfWord(
|
|
FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
|
|
FPGA_HF_READER_RX_XCORR_SNOOP);
|
|
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
|
|
|
|
// Setup for the DMA.
|
|
FpgaSetupSsc();
|
|
upTo = dmaBuf;
|
|
lastRxCounter = DEMOD_DMA_BUFFER_SIZE;
|
|
FpgaSetupSscDma((uint8_t *)dmaBuf, DEMOD_DMA_BUFFER_SIZE);
|
|
|
|
LED_A_ON();
|
|
|
|
// And now we loop, receiving samples.
|
|
for(;;) {
|
|
int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
|
|
(DEMOD_DMA_BUFFER_SIZE-1);
|
|
if(behindBy > maxBehindBy) {
|
|
maxBehindBy = behindBy;
|
|
if(behindBy > (DEMOD_DMA_BUFFER_SIZE-2)) { // TODO: understand whether we can increase/decrease as we want or not?
|
|
Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
|
|
goto done;
|
|
}
|
|
}
|
|
if(behindBy < 2) continue;
|
|
|
|
ci = upTo[0];
|
|
cq = upTo[1];
|
|
upTo += 2;
|
|
lastRxCounter -= 2;
|
|
if(upTo - dmaBuf > DEMOD_DMA_BUFFER_SIZE) {
|
|
upTo -= DEMOD_DMA_BUFFER_SIZE;
|
|
lastRxCounter += DEMOD_DMA_BUFFER_SIZE;
|
|
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
|
|
AT91C_BASE_PDC_SSC->PDC_RNCR = DEMOD_DMA_BUFFER_SIZE;
|
|
}
|
|
|
|
samples += 2;
|
|
|
|
#define HANDLE_BIT_IF_BODY \
|
|
if(triggered) { \
|
|
trace[traceLen++] = ((samples >> 0) & 0xff); \
|
|
trace[traceLen++] = ((samples >> 8) & 0xff); \
|
|
trace[traceLen++] = ((samples >> 16) & 0xff); \
|
|
trace[traceLen++] = ((samples >> 24) & 0xff); \
|
|
trace[traceLen++] = 0; \
|
|
trace[traceLen++] = 0; \
|
|
trace[traceLen++] = 0; \
|
|
trace[traceLen++] = 0; \
|
|
trace[traceLen++] = Uart.byteCnt; \
|
|
memcpy(trace+traceLen, receivedCmd, Uart.byteCnt); \
|
|
traceLen += Uart.byteCnt; \
|
|
if(traceLen > 1000) break; \
|
|
} \
|
|
/* And ready to receive another command. */ \
|
|
memset(&Uart, 0, sizeof(Uart)); \
|
|
Uart.output = receivedCmd; \
|
|
Uart.byteCntMax = 100; \
|
|
Uart.state = STATE_UNSYNCD; \
|
|
/* And also reset the demod code, which might have been */ \
|
|
/* false-triggered by the commands from the reader. */ \
|
|
memset(&Demod, 0, sizeof(Demod)); \
|
|
Demod.output = receivedResponse; \
|
|
Demod.state = DEMOD_UNSYNCD; \
|
|
|
|
if(Handle14443UartBit(ci & 1)) {
|
|
HANDLE_BIT_IF_BODY
|
|
}
|
|
if(Handle14443UartBit(cq & 1)) {
|
|
HANDLE_BIT_IF_BODY
|
|
}
|
|
|
|
if(Handle14443SamplesDemod(ci, cq)) {
|
|
// timestamp, as a count of samples
|
|
trace[traceLen++] = ((samples >> 0) & 0xff);
|
|
trace[traceLen++] = ((samples >> 8) & 0xff);
|
|
trace[traceLen++] = ((samples >> 16) & 0xff);
|
|
trace[traceLen++] = 0x80 | ((samples >> 24) & 0xff);
|
|
// correlation metric (~signal strength estimate)
|
|
if(Demod.metricN != 0) {
|
|
Demod.metric /= Demod.metricN;
|
|
}
|
|
trace[traceLen++] = ((Demod.metric >> 0) & 0xff);
|
|
trace[traceLen++] = ((Demod.metric >> 8) & 0xff);
|
|
trace[traceLen++] = ((Demod.metric >> 16) & 0xff);
|
|
trace[traceLen++] = ((Demod.metric >> 24) & 0xff);
|
|
// length
|
|
trace[traceLen++] = Demod.len;
|
|
memcpy(trace+traceLen, receivedResponse, Demod.len);
|
|
traceLen += Demod.len;
|
|
if(traceLen > DEMOD_TRACE_SIZE) {
|
|
DbpString("Reached trace limit");
|
|
goto done;
|
|
}
|
|
|
|
triggered = TRUE;
|
|
LED_A_OFF();
|
|
LED_B_ON();
|
|
|
|
// And ready to receive another response.
|
|
memset(&Demod, 0, sizeof(Demod));
|
|
Demod.output = receivedResponse;
|
|
Demod.state = DEMOD_UNSYNCD;
|
|
}
|
|
WDT_HIT();
|
|
|
|
if(BUTTON_PRESS()) {
|
|
DbpString("cancelled");
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
LED_A_OFF();
|
|
LED_B_OFF();
|
|
LED_C_OFF();
|
|
AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
|
|
DbpString("Snoop statistics:");
|
|
Dbprintf(" Max behind by: %i", maxBehindBy);
|
|
Dbprintf(" Uart State: %x", Uart.state);
|
|
Dbprintf(" Uart ByteCnt: %i", Uart.byteCnt);
|
|
Dbprintf(" Uart ByteCntMax: %i", Uart.byteCntMax);
|
|
Dbprintf(" Trace length: %i", traceLen);
|
|
}
|
|
|
|
/*
|
|
* Send raw command to tag ISO14443B
|
|
* @Input
|
|
* datalen len of buffer data
|
|
* recv bool when true wait for data from tag and send to client
|
|
* powerfield bool leave the field on when true
|
|
* data buffer with byte to send
|
|
*
|
|
* @Output
|
|
* none
|
|
*
|
|
*/
|
|
|
|
void SendRawCommand14443B(uint32_t datalen, uint32_t recv,uint8_t powerfield, uint8_t data[])
|
|
{
|
|
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
|
|
if(!powerfield)
|
|
{
|
|
// Make sure that we start from off, since the tags are stateful;
|
|
// confusing things will happen if we don't reset them between reads.
|
|
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
|
|
LED_D_OFF();
|
|
SpinDelay(200);
|
|
}
|
|
|
|
if(!GETBIT(GPIO_LED_D))
|
|
{
|
|
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
|
|
FpgaSetupSsc();
|
|
|
|
// Now give it time to spin up.
|
|
// Signal field is on with the appropriate LED
|
|
LED_D_ON();
|
|
FpgaWriteConfWord(
|
|
FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
|
|
SpinDelay(200);
|
|
}
|
|
|
|
CodeIso14443bAsReader(data, datalen);
|
|
TransmitFor14443();
|
|
if(recv)
|
|
{
|
|
uint16_t iLen = MIN(Demod.len,USB_CMD_DATA_SIZE);
|
|
GetSamplesFor14443Demod(TRUE, 2000, TRUE);
|
|
cmd_send(CMD_ACK,iLen,0,0,Demod.output,iLen);
|
|
}
|
|
if(!powerfield)
|
|
{
|
|
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
|
|
LED_D_OFF();
|
|
}
|
|
}
|
|
|