X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/aabb719dc4e9af383e20c79647612755957bca00..786ad91c85238557ea60144971ee6aea271315e8:/armsrc/hitag2.c diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c index 4b173d6f..8e690a7b 100644 --- a/armsrc/hitag2.c +++ b/armsrc/hitag2.c @@ -64,6 +64,13 @@ static struct hitag2_tag tag = { }, }; +static enum { + WRITE_STATE_START = 0x0, + WRITE_STATE_PAGENUM_WRITTEN, + WRITE_STATE_PROG +} writestate; + + // ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces. // Historically it used to be FREE_BUFFER_SIZE, which was 2744. #define AUTH_TABLE_LENGTH 2744 @@ -74,6 +81,7 @@ static size_t auth_table_len = AUTH_TABLE_LENGTH; static byte_t password[4]; static byte_t NrAr[8]; static byte_t key[8]; +static byte_t writedata[4]; static uint64_t cipher_state; /* Following is a modified version of cryptolib.com/ciphers/hitag2/ */ @@ -106,13 +114,13 @@ static const u32 ht2_f5c = 0x7907287B; // 0111 1001 0000 0111 0010 1000 0111 101 static u32 _f20 (const u64 x) { - u32 i5; - + u32 i5; + i5 = ((ht2_f4a >> i4 (x, 1, 2, 4, 5)) & 1)* 1 - + ((ht2_f4b >> i4 (x, 7,11,13,14)) & 1)* 2 - + ((ht2_f4b >> i4 (x,16,20,22,25)) & 1)* 4 - + ((ht2_f4b >> i4 (x,27,28,30,32)) & 1)* 8 - + ((ht2_f4a >> i4 (x,33,42,43,45)) & 1)*16; + + ((ht2_f4b >> i4 (x, 7,11,13,14)) & 1)* 2 + + ((ht2_f4b >> i4 (x,16,20,22,25)) & 1)* 4 + + ((ht2_f4b >> i4 (x,27,28,30,32)) & 1)* 8 + + ((ht2_f4a >> i4 (x,33,42,43,45)) & 1)*16; return (ht2_f5c >> i5) & 1; } @@ -135,10 +143,10 @@ static u64 _hitag2_round (u64 *state) u64 x = *state; x = (x >> 1) + - ((((x >> 0) ^ (x >> 2) ^ (x >> 3) ^ (x >> 6) - ^ (x >> 7) ^ (x >> 8) ^ (x >> 16) ^ (x >> 22) - ^ (x >> 23) ^ (x >> 26) ^ (x >> 30) ^ (x >> 41) - ^ (x >> 42) ^ (x >> 43) ^ (x >> 46) ^ (x >> 47)) & 1) << 47); + ((((x >> 0) ^ (x >> 2) ^ (x >> 3) ^ (x >> 6) + ^ (x >> 7) ^ (x >> 8) ^ (x >> 16) ^ (x >> 22) + ^ (x >> 23) ^ (x >> 26) ^ (x >> 30) ^ (x >> 41) + ^ (x >> 42) ^ (x >> 43) ^ (x >> 46) ^ (x >> 47)) & 1) << 47); *state = x; return _f20 (x); @@ -169,19 +177,19 @@ static int hitag2_init(void) static void hitag2_cipher_reset(struct hitag2_tag *tag, const byte_t *iv) { uint64_t key = ((uint64_t)tag->sectors[2][2]) | - ((uint64_t)tag->sectors[2][3] << 8) | - ((uint64_t)tag->sectors[1][0] << 16) | - ((uint64_t)tag->sectors[1][1] << 24) | - ((uint64_t)tag->sectors[1][2] << 32) | - ((uint64_t)tag->sectors[1][3] << 40); + ((uint64_t)tag->sectors[2][3] << 8) | + ((uint64_t)tag->sectors[1][0] << 16) | + ((uint64_t)tag->sectors[1][1] << 24) | + ((uint64_t)tag->sectors[1][2] << 32) | + ((uint64_t)tag->sectors[1][3] << 40); uint32_t uid = ((uint32_t)tag->sectors[0][0]) | - ((uint32_t)tag->sectors[0][1] << 8) | - ((uint32_t)tag->sectors[0][2] << 16) | - ((uint32_t)tag->sectors[0][3] << 24); + ((uint32_t)tag->sectors[0][1] << 8) | + ((uint32_t)tag->sectors[0][2] << 16) | + ((uint32_t)tag->sectors[0][3] << 24); uint32_t iv_ = (((uint32_t)(iv[0]))) | - (((uint32_t)(iv[1])) << 8) | - (((uint32_t)(iv[2])) << 16) | - (((uint32_t)(iv[3])) << 24); + (((uint32_t)(iv[1])) << 8) | + (((uint32_t)(iv[2])) << 16) | + (((uint32_t)(iv[3])) << 24); tag->cs = _hitag2_init(rev64(key), rev32(uid), rev32(iv_)); } @@ -222,6 +230,7 @@ static int hitag2_cipher_transcrypt(uint64_t* cs, byte_t *data, unsigned int byt #define HITAG_T_WAIT_1 200 /* T_wresp should be 199..206 */ #define HITAG_T_WAIT_2 90 /* T_wresp should be 199..206 */ #define HITAG_T_WAIT_MAX 300 /* bit more than HITAG_T_WAIT_1 + HITAG_T_WAIT_2 */ +#define HITAG_T_PROG 614 #define HITAG_T_TAG_ONE_HALF_PERIOD 10 #define HITAG_T_TAG_TWO_HALF_PERIOD 25 @@ -293,105 +302,105 @@ static void hitag2_handle_reader_command(byte_t* rx, const size_t rxlen, byte_t* // Try to find out which command was send by selecting on length (in bits) switch (rxlen) { // Received 11000 from the reader, request for UID, send UID - case 05: { - // Always send over the air in the clear plaintext mode - if(rx_air[0] != 0xC0) { - // Unknown frame ? - return; - } - *txlen = 32; - memcpy(tx,tag.sectors[0],4); - tag.crypto_active = 0; + case 05: { + // Always send over the air in the clear plaintext mode + if(rx_air[0] != 0xC0) { + // Unknown frame ? + return; } + *txlen = 32; + memcpy(tx,tag.sectors[0],4); + tag.crypto_active = 0; + } break; // Read/Write command: ..xx x..y yy with yyy == ~xxx, xxx is sector number - case 10: { - unsigned int sector = (~( ((rx[0]<<2)&0x04) | ((rx[1]>>6)&0x03) ) & 0x07); - // Verify complement of sector index - if(sector != ((rx[0]>>3)&0x07)) { - //DbpString("Transmission error (read/write)"); - return; - } + case 10: { + unsigned int sector = (~( ((rx[0]<<2)&0x04) | ((rx[1]>>6)&0x03) ) & 0x07); + // Verify complement of sector index + if(sector != ((rx[0]>>3)&0x07)) { + //DbpString("Transmission error (read/write)"); + return; + } - switch (rx[0] & 0xC6) { - // Read command: 11xx x00y - case 0xC0: - memcpy(tx,tag.sectors[sector],4); - *txlen = 32; - break; + switch (rx[0] & 0xC6) { + // Read command: 11xx x00y + case 0xC0: + memcpy(tx,tag.sectors[sector],4); + *txlen = 32; + break; - // Inverted Read command: 01xx x10y - case 0x44: - for (size_t i=0; i<4; i++) { - tx[i] = tag.sectors[sector][i] ^ 0xff; - } - *txlen = 32; - break; - - // Write command: 10xx x01y - case 0x82: - // Prepare write, acknowledge by repeating command - memcpy(tx,rx,nbytes(rxlen)); - *txlen = rxlen; - tag.active_sector = sector; - tag.state=TAG_STATE_WRITING; - break; - - // Unknown command - default: - Dbprintf("Uknown command: %02x %02x",rx[0],rx[1]); - return; - break; + // Inverted Read command: 01xx x10y + case 0x44: + for (size_t i=0; i<4; i++) { + tx[i] = tag.sectors[sector][i] ^ 0xff; } + *txlen = 32; + break; + + // Write command: 10xx x01y + case 0x82: + // Prepare write, acknowledge by repeating command + memcpy(tx,rx,nbytes(rxlen)); + *txlen = rxlen; + tag.active_sector = sector; + tag.state=TAG_STATE_WRITING; + break; + + // Unknown command + default: + Dbprintf("Unknown command: %02x %02x",rx[0],rx[1]); + return; + break; } + } break; // Writing data or Reader password - case 32: { - if(tag.state == TAG_STATE_WRITING) { - // These are the sector contents to be written. We don't have to do anything else. - memcpy(tag.sectors[tag.active_sector],rx,nbytes(rxlen)); - tag.state=TAG_STATE_RESET; + case 32: { + if(tag.state == TAG_STATE_WRITING) { + // These are the sector contents to be written. We don't have to do anything else. + memcpy(tag.sectors[tag.active_sector],rx,nbytes(rxlen)); + tag.state=TAG_STATE_RESET; + return; + } else { + // Received RWD password, respond with configuration and our password + if(memcmp(rx,tag.sectors[1],4) != 0) { + DbpString("Reader password is wrong"); return; - } else { - // Received RWD password, respond with configuration and our password - if(memcmp(rx,tag.sectors[1],4) != 0) { - DbpString("Reader password is wrong"); - return; - } - *txlen = 32; - memcpy(tx,tag.sectors[3],4); } + *txlen = 32; + memcpy(tx,tag.sectors[3],4); } + } break; // Received RWD authentication challenge and respnse - case 64: { - // Store the authentication attempt - if (auth_table_len < (AUTH_TABLE_LENGTH-8)) { - memcpy(auth_table+auth_table_len,rx,8); - auth_table_len += 8; - } + case 64: { + // Store the authentication attempt + if (auth_table_len < (AUTH_TABLE_LENGTH-8)) { + memcpy(auth_table+auth_table_len,rx,8); + auth_table_len += 8; + } - // Reset the cipher state - hitag2_cipher_reset(&tag,rx); - // Check if the authentication was correct - if(!hitag2_cipher_authenticate(&(tag.cs),rx+4)) { - // The reader failed to authenticate, do nothing - Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed!",rx[0],rx[1],rx[2],rx[3],rx[4],rx[5],rx[6],rx[7]); - return; - } - // Succesful, but commented out reporting back to the Host, this may delay to much. - // Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x OK!",rx[0],rx[1],rx[2],rx[3],rx[4],rx[5],rx[6],rx[7]); + // Reset the cipher state + hitag2_cipher_reset(&tag,rx); + // Check if the authentication was correct + if(!hitag2_cipher_authenticate(&(tag.cs),rx+4)) { + // The reader failed to authenticate, do nothing + Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed!",rx[0],rx[1],rx[2],rx[3],rx[4],rx[5],rx[6],rx[7]); + return; + } + // Succesful, but commented out reporting back to the Host, this may delay to much. + // Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x OK!",rx[0],rx[1],rx[2],rx[3],rx[4],rx[5],rx[6],rx[7]); - // Activate encryption algorithm for all further communication - tag.crypto_active = 1; + // Activate encryption algorithm for all further communication + tag.crypto_active = 1; - // Use the tag password as response - memcpy(tx,tag.sectors[3],4); - *txlen = 32; - } + // Use the tag password as response + memcpy(tx,tag.sectors[3],4); + *txlen = 32; + } break; } @@ -411,7 +420,7 @@ static void hitag_reader_send_bit(int bit) { // Binary puls length modulation (BPLM) is used to encode the data stream // This means that a transmission of a one takes longer than that of a zero - // Enable modulation, which means, drop the the field + // Enable modulation, which means, drop the field HIGH(GPIO_SSC_DOUT); // Wait for 4-10 times the carrier period @@ -442,7 +451,7 @@ static void hitag_reader_send_frame(const byte_t* frame, size_t frame_len) } // Send EOF AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; - // Enable modulation, which means, drop the the field + // Enable modulation, which means, drop the field HIGH(GPIO_SSC_DOUT); // Wait for 4-10 times the carrier period while(AT91C_BASE_TC0->TC_CV < T0*6); @@ -459,25 +468,25 @@ static bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* // Try to find out which command was send by selecting on length (in bits) switch (rxlen) { // No answer, try to resurrect - case 0: { - // Stop if there is no answer (after sending password) - if (bPwd) { - DbpString("Password failed!"); - return false; - } - *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } break; + case 0: { + // Stop if there is no answer (after sending password) + if (bPwd) { + DbpString("Password failed!"); + return false; + } + *txlen = 5; + memcpy(tx,"\xc0",nbytes(*txlen)); + } break; // Received UID, tag password - case 32: { - if (!bPwd) { - *txlen = 32; - memcpy(tx,password,4); - bPwd = true; - memcpy(tag.sectors[blocknr],rx,4); - blocknr++; - } else { + case 32: { + if (!bPwd) { + *txlen = 32; + memcpy(tx,password,4); + bPwd = true; + memcpy(tag.sectors[blocknr],rx,4); + blocknr++; + } else { if(blocknr == 1){ //store password in block1, the TAG answers with Block3, but we need the password in memory @@ -488,112 +497,173 @@ static bool hitag2_password(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* blocknr++; if (blocknr > 7) { - DbpString("Read succesful!"); - bSuccessful = true; - return false; + DbpString("Read succesful!"); + bSuccessful = true; + return false; } *txlen = 10; tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2); tx[1] = ((blocknr^7) << 6); - } - } break; + } + } break; // Unexpected response - default: { - Dbprintf("Uknown frame length: %d",rxlen); + default: { + Dbprintf("Uknown frame length: %d",rxlen); + return false; + } break; + } + return true; +} + +static bool hitag2_write_page(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) +{ + switch (writestate) { + case WRITE_STATE_START: + *txlen = 10; + tx[0] = 0x82 | (blocknr << 3) | ((blocknr^7) >> 2); + tx[1] = ((blocknr^7) << 6); + writestate = WRITE_STATE_PAGENUM_WRITTEN; + break; + case WRITE_STATE_PAGENUM_WRITTEN: + // Check if page number was received correctly + if ((rxlen == 10) && + (rx[0] == (0x82 | (blocknr << 3) | ((blocknr^7) >> 2))) && + (rx[1] == (((blocknr & 0x3) ^ 0x3) << 6))) { + *txlen = 32; + memset(tx, 0, HITAG_FRAME_LEN); + memcpy(tx, writedata, 4); + writestate = WRITE_STATE_PROG; + } else { + Dbprintf("hitag2_write_page: Page number was not received correctly: rxlen=%d rx=%02x%02x%02x%02x", + rxlen, rx[0], rx[1], rx[2], rx[3]); + bSuccessful = false; return false; - } break; + } + break; + case WRITE_STATE_PROG: + if (rxlen == 0) { + bSuccessful = true; + } else { + bSuccessful = false; + Dbprintf("hitag2_write_page: unexpected rx data (%d) after page write", rxlen); + } + return false; + default: + DbpString("hitag2_write_page: Unknown state %d"); + bSuccessful = false; + return false; } + return true; } -static bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) { +static bool hitag2_crypto(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen, bool write) { // Reset the transmission frame length *txlen = 0; - if(bCrypto) { + if(bCrypto) { hitag2_cipher_transcrypt(&cipher_state,rx,rxlen/8,rxlen%8); + + } + + if (bCrypto && !bAuthenticating && write) { + if (!hitag2_write_page(rx, rxlen, tx, txlen)) { + return false; + } } + else + { // Try to find out which command was send by selecting on length (in bits) switch (rxlen) { - // No answer, try to resurrect - case 0: { - // Stop if there is no answer while we are in crypto mode (after sending NrAr) - if (bCrypto) { - // Failed during authentication - if (bAuthenticating) { - DbpString("Authentication failed!"); - return false; - } else { - // Failed reading a block, could be (read/write) locked, skip block and re-authenticate - if (blocknr == 1) { - // Write the low part of the key in memory - memcpy(tag.sectors[1],key+2,4); - } else if (blocknr == 2) { - // Write the high part of the key in memory - tag.sectors[2][0] = 0x00; - tag.sectors[2][1] = 0x00; - tag.sectors[2][2] = key[0]; - tag.sectors[2][3] = key[1]; - } else { - // Just put zero's in the memory (of the unreadable block) - memset(tag.sectors[blocknr],0x00,4); - } - blocknr++; - bCrypto = false; - } + // No answer, try to resurrect + case 0: + { + // Stop if there is no answer while we are in crypto mode (after sending NrAr) + if (bCrypto) { + // Failed during authentication + if (bAuthenticating) { + DbpString("Authentication failed!"); + return false; } else { - *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } - } break; - - // Received UID, crypto tag answer - case 32: { - if (!bCrypto) { - uint64_t ui64key = key[0] | ((uint64_t)key[1]) << 8 | ((uint64_t)key[2]) << 16 | ((uint64_t)key[3]) << 24 | ((uint64_t)key[4]) << 32 | ((uint64_t)key[5]) << 40; - uint32_t ui32uid = rx[0] | ((uint32_t)rx[1]) << 8 | ((uint32_t)rx[2]) << 16 | ((uint32_t)rx[3]) << 24; - cipher_state = _hitag2_init(rev64(ui64key), rev32(ui32uid), 0); - memset(tx,0x00,4); - memset(tx+4,0xff,4); - hitag2_cipher_transcrypt(&cipher_state,tx+4,4,0); - *txlen = 64; - bCrypto = true; - bAuthenticating = true; + // Failed reading a block, could be (read/write) locked, skip block and re-authenticate + if (blocknr == 1) { + // Write the low part of the key in memory + memcpy(tag.sectors[1],key+2,4); + } else if (blocknr == 2) { + // Write the high part of the key in memory + tag.sectors[2][0] = 0x00; + tag.sectors[2][1] = 0x00; + tag.sectors[2][2] = key[0]; + tag.sectors[2][3] = key[1]; + } else { + // Just put zero's in the memory (of the unreadable block) + memset(tag.sectors[blocknr],0x00,4); + } + blocknr++; + bCrypto = false; + } + } else { + *txlen = 5; + memcpy(tx,"\xc0",nbytes(*txlen)); + } + break; + } + // Received UID, crypto tag answer + case 32: { + if (!bCrypto) { + uint64_t ui64key = key[0] | ((uint64_t)key[1]) << 8 | ((uint64_t)key[2]) << 16 | ((uint64_t)key[3]) << 24 | ((uint64_t)key[4]) << 32 | ((uint64_t)key[5]) << 40; + uint32_t ui32uid = rx[0] | ((uint32_t)rx[1]) << 8 | ((uint32_t)rx[2]) << 16 | ((uint32_t)rx[3]) << 24; + Dbprintf("hitag2_crypto: key=0x%x%x uid=0x%x", (uint32_t) ((rev64(ui64key)) >> 32), (uint32_t) ((rev64(ui64key)) & 0xffffffff), rev32(ui32uid)); + cipher_state = _hitag2_init(rev64(ui64key), rev32(ui32uid), 0); + memset(tx,0x00,4); + memset(tx+4,0xff,4); + hitag2_cipher_transcrypt(&cipher_state, tx+4, 4, 0); + *txlen = 64; + bCrypto = true; + bAuthenticating = true; + } else { + // Check if we received answer tag (at) + if (bAuthenticating) { + bAuthenticating = false; + if (write) { + if (!hitag2_write_page(rx, rxlen, tx, txlen)) { + return false; + } + break; + } } else { - // Check if we received answer tag (at) - if (bAuthenticating) { - bAuthenticating = false; - } else { - // Store the received block - memcpy(tag.sectors[blocknr],rx,4); - blocknr++; - } - if (blocknr > 7) { - DbpString("Read succesful!"); - bSuccessful = true; - return false; - } - *txlen = 10; - tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2); - tx[1] = ((blocknr^7) << 6); + // Store the received block + memcpy(tag.sectors[blocknr],rx,4); + blocknr++; } - } break; + + if (blocknr > 7) { + DbpString("Read succesful!"); + bSuccessful = true; + return false; + } else { + *txlen = 10; + tx[0] = 0xc0 | (blocknr << 3) | ((blocknr^7) >> 2); + tx[1] = ((blocknr^7) << 6); + } + } + } break; - // Unexpected response - default: { - Dbprintf("Uknown frame length: %d",rxlen); - return false; - } break; + // Unexpected response + default: { + Dbprintf("Uknown frame length: %d",rxlen); + return false; + } break; + } } - - if(bCrypto) { - // We have to return now to avoid double encryption - if (!bAuthenticating) { - hitag2_cipher_transcrypt(&cipher_state,tx,*txlen/8,*txlen%8); - } + if(bCrypto) { + // We have to return now to avoid double encryption + if (!bAuthenticating) { + hitag2_cipher_transcrypt(&cipher_state,tx,*txlen/8,*txlen%8); + } } return true; @@ -607,34 +677,34 @@ static bool hitag2_authenticate(byte_t* rx, const size_t rxlen, byte_t* tx, size // Try to find out which command was send by selecting on length (in bits) switch (rxlen) { // No answer, try to resurrect - case 0: { - // Stop if there is no answer while we are in crypto mode (after sending NrAr) - if (bCrypto) { - DbpString("Authentication failed!"); - return false; - } - *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } break; + case 0: { + // Stop if there is no answer while we are in crypto mode (after sending NrAr) + if (bCrypto) { + DbpString("Authentication failed!"); + return false; + } + *txlen = 5; + memcpy(tx,"\xc0",nbytes(*txlen)); + } break; // Received UID, crypto tag answer - case 32: { - if (!bCrypto) { - *txlen = 64; - memcpy(tx,NrAr,8); - bCrypto = true; - } else { - DbpString("Authentication succesful!"); - // We are done... for now - return false; - } - } break; + case 32: { + if (!bCrypto) { + *txlen = 64; + memcpy(tx,NrAr,8); + bCrypto = true; + } else { + DbpString("Authentication succesful!"); + // We are done... for now + return false; + } + } break; // Unexpected response - default: { - Dbprintf("Uknown frame length: %d",rxlen); - return false; - } break; + default: { + Dbprintf("Uknown frame length: %d",rxlen); + return false; + } break; } return true; @@ -648,55 +718,91 @@ static bool hitag2_test_auth_attempts(byte_t* rx, const size_t rxlen, byte_t* tx // Try to find out which command was send by selecting on length (in bits) switch (rxlen) { - // No answer, try to resurrect - case 0: { - // Stop if there is no answer while we are in crypto mode (after sending NrAr) - if (bCrypto) { - Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed, removed entry!",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]); - - // Removing failed entry from authentiations table - memcpy(auth_table+auth_table_pos,auth_table+auth_table_pos+8,8); - auth_table_len -= 8; + // No answer, try to resurrect + case 0: { + // Stop if there is no answer while we are in crypto mode (after sending NrAr) + if (bCrypto) { + Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x Failed, removed entry!",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]); - // Return if we reached the end of the authentications table - bCrypto = false; - if (auth_table_pos == auth_table_len) { - return false; - } + // Removing failed entry from authentiations table + memcpy(auth_table+auth_table_pos,auth_table+auth_table_pos+8,8); + auth_table_len -= 8; - // Copy the next authentication attempt in row (at the same position, b/c we removed last failed entry) - memcpy(NrAr,auth_table+auth_table_pos,8); + // Return if we reached the end of the authentications table + bCrypto = false; + if (auth_table_pos == auth_table_len) { + return false; } - *txlen = 5; - memcpy(tx,"\xc0",nbytes(*txlen)); - } break; + + // Copy the next authentication attempt in row (at the same position, b/c we removed last failed entry) + memcpy(NrAr,auth_table+auth_table_pos,8); + } + *txlen = 5; + memcpy(tx,"\xc0",nbytes(*txlen)); + } break; - // Received UID, crypto tag answer, or read block response - case 32: { - if (!bCrypto) { - *txlen = 64; - memcpy(tx,NrAr,8); - bCrypto = true; - } else { - Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x OK",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]); - bCrypto = false; - if ((auth_table_pos+8) == auth_table_len) { - return false; - } - auth_table_pos += 8; - memcpy(NrAr,auth_table+auth_table_pos,8); + // Received UID, crypto tag answer, or read block response + case 32: { + if (!bCrypto) { + *txlen = 64; + memcpy(tx,NrAr,8); + bCrypto = true; + } else { + Dbprintf("auth: %02x%02x%02x%02x%02x%02x%02x%02x OK",NrAr[0],NrAr[1],NrAr[2],NrAr[3],NrAr[4],NrAr[5],NrAr[6],NrAr[7]); + bCrypto = false; + if ((auth_table_pos+8) == auth_table_len) { + return false; } - } break; + auth_table_pos += 8; + memcpy(NrAr,auth_table+auth_table_pos,8); + } + } break; - default: { - Dbprintf("Uknown frame length: %d",rxlen); - return false; - } break; + default: { + Dbprintf("Uknown frame length: %d",rxlen); + return false; + } break; } return true; } +static bool hitag2_read_uid(byte_t* rx, const size_t rxlen, byte_t* tx, size_t* txlen) { + // Reset the transmission frame length + *txlen = 0; + + // Try to find out which command was send by selecting on length (in bits) + switch (rxlen) { + // No answer, try to resurrect + case 0: { + // Just starting or if there is no answer + *txlen = 5; + memcpy(tx,"\xc0",nbytes(*txlen)); + } break; + // Received UID + case 32: { + // Check if we received answer tag (at) + if (bAuthenticating) { + bAuthenticating = false; + } else { + // Store the received block + memcpy(tag.sectors[blocknr],rx,4); + blocknr++; + } + if (blocknr > 0) { + //DbpString("Read successful!"); + bSuccessful = true; + return false; + } + } break; + // Unexpected response + default: { + Dbprintf("Uknown frame length: %d",rxlen); + return false; + } break; + } + return true; +} void SnoopHitag(uint32_t type) { int frame_count; @@ -707,25 +813,27 @@ void SnoopHitag(uint32_t type) { int lastbit; bool bSkip; int tag_sof; - byte_t rx[HITAG_FRAME_LEN]; + byte_t rx[HITAG_FRAME_LEN] = {0}; size_t rxlen=0; + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + + // Clean up trace and prepare it for storing frames + set_tracing(true); + clear_trace(); + auth_table_len = 0; auth_table_pos = 0; + BigBuf_free(); - auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH); + auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH); memset(auth_table, 0x00, AUTH_TABLE_LENGTH); - // Clean up trace and prepare it for storing frames - set_tracing(TRUE); - clear_trace(); - DbpString("Starting Hitag2 snoop"); LED_D_ON(); // Set up eavesdropping mode, frequency divisor which will drive the FPGA // and analog mux selection. - FpgaDownloadAndGo(FPGA_BITSTREAM_LF); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_TOGGLE_MODE); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); @@ -754,7 +862,6 @@ void SnoopHitag(uint32_t type) { AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // Reset the received frame, frame count and timing info - memset(rx,0x00,sizeof(rx)); frame_count = 0; response = 0; overflow = 0; @@ -788,7 +895,7 @@ void SnoopHitag(uint32_t type) { // Only handle if reader frame and rising edge, or tag frame and falling edge if (reader_frame != rising_edge) { - overflow += ra; + overflow += ra; continue; } @@ -897,14 +1004,14 @@ void SnoopHitag(uint32_t type) { // Reset the timer to restart while-loop that receives frames AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG; } - LED_A_ON(); + LED_A_ON(); LED_B_OFF(); LED_C_OFF(); LED_D_OFF(); AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; - AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_A_OFF(); + LED_A_OFF(); // Dbprintf("frame received: %d",frame_count); // Dbprintf("Authentication Attempts: %d",(auth_table_len/8)); @@ -922,17 +1029,19 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { bool bQuitTraceFull = false; bQuiet = false; + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + + // Clean up trace and prepare it for storing frames + set_tracing(true); + clear_trace(); + auth_table_len = 0; auth_table_pos = 0; - byte_t* auth_table; + byte_t* auth_table; BigBuf_free(); - auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH); + auth_table = (byte_t *)BigBuf_malloc(AUTH_TABLE_LENGTH); memset(auth_table, 0x00, AUTH_TABLE_LENGTH); - // Clean up trace and prepare it for storing frames - set_tracing(TRUE); - clear_trace(); - DbpString("Starting Hitag2 simulation"); LED_D_ON(); hitag2_init(); @@ -953,8 +1062,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { // Set up simulator mode, frequency divisor which will drive the FPGA // and analog mux selection. - FpgaDownloadAndGo(FPGA_BITSTREAM_LF); - FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT); FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz SetAdcMuxFor(GPIO_MUXSEL_LOPKD); RELAY_OFF(); @@ -973,7 +1081,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) { AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; - // Disable timer during configuration + // Disable timer during configuration AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // Capture mode, default timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, @@ -1109,7 +1217,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { int reset_sof; int tag_sof; int t_wait = HITAG_T_WAIT_MAX; - bool bStop; + bool bStop = false; bool bQuitTraceFull = false; FpgaDownloadAndGo(FPGA_BITSTREAM_LF); @@ -1117,56 +1225,60 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { bSuccessful = false; // Clean up trace and prepare it for storing frames - set_tracing(TRUE); + set_tracing(true); clear_trace(); - DbpString("Starting Hitag reader family"); + //DbpString("Starting Hitag reader family"); // Check configuration switch(htf) { - case RHT2F_PASSWORD: { - Dbprintf("List identifier in password mode"); - memcpy(password,htd->pwd.password,4); - blocknr = 0; - bQuitTraceFull = false; - bQuiet = false; - bPwd = false; - } break; - - case RHT2F_AUTHENTICATE: { - DbpString("Authenticating using nr,ar pair:"); - memcpy(NrAr,htd->auth.NrAr,8); - Dbhexdump(8,NrAr,false); - bQuiet = false; - bCrypto = false; - bAuthenticating = false; - bQuitTraceFull = true; - } break; - - case RHT2F_CRYPTO: { - DbpString("Authenticating using key:"); - memcpy(key,htd->crypto.key,4); //HACK; 4 or 6?? I read both in the code. - Dbhexdump(6,key,false); - blocknr = 0; - bQuiet = false; - bCrypto = false; - bAuthenticating = false; - bQuitTraceFull = true; - } break; - - case RHT2F_TEST_AUTH_ATTEMPTS: { - Dbprintf("Testing %d authentication attempts",(auth_table_len/8)); - auth_table_pos = 0; - memcpy(NrAr, auth_table, 8); - bQuitTraceFull = false; - bQuiet = false; - bCrypto = false; - } break; - - default: { - Dbprintf("Error, unknown function: %d",htf); - return; - } break; + case RHT2F_PASSWORD: { + Dbprintf("List identifier in password mode"); + memcpy(password,htd->pwd.password,4); + blocknr = 0; + bQuitTraceFull = false; + bQuiet = false; + bPwd = false; + } break; + case RHT2F_AUTHENTICATE: { + DbpString("Authenticating using nr,ar pair:"); + memcpy(NrAr,htd->auth.NrAr,8); + Dbhexdump(8,NrAr,false); + bQuiet = false; + bCrypto = false; + bAuthenticating = false; + bQuitTraceFull = true; + } break; + case RHT2F_CRYPTO: + { + DbpString("Authenticating using key:"); + memcpy(key,htd->crypto.key,6); //HACK; 4 or 6?? I read both in the code. + Dbhexdump(6,key,false); + blocknr = 0; + bQuiet = false; + bCrypto = false; + bAuthenticating = false; + bQuitTraceFull = true; + } break; + case RHT2F_TEST_AUTH_ATTEMPTS: { + Dbprintf("Testing %d authentication attempts",(auth_table_len/8)); + auth_table_pos = 0; + memcpy(NrAr, auth_table, 8); + bQuitTraceFull = false; + bQuiet = false; + bCrypto = false; + } break; + case RHT2F_UID_ONLY: { + blocknr = 0; + bQuiet = false; + bCrypto = false; + bAuthenticating = false; + bQuitTraceFull = true; + } break; + default: { + Dbprintf("Error, unknown function: %d",htf); + return; + } break; } LED_D_ON(); @@ -1197,7 +1309,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; - // Disable timer during configuration + // Disable timer during configuration AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, @@ -1212,29 +1324,28 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { frame_count = 0; response = 0; lastbit = 1; - bStop = false; - // Tag specific configuration settings (sof, timings, etc.) - if (htf < 10){ - // hitagS settings - reset_sof = 1; - t_wait = 200; - DbpString("Configured for hitagS reader"); - } else if (htf < 20) { - // hitag1 settings - reset_sof = 1; - t_wait = 200; - DbpString("Configured for hitag1 reader"); - } else if (htf < 30) { - // hitag2 settings - reset_sof = 4; - t_wait = HITAG_T_WAIT_2; - DbpString("Configured for hitag2 reader"); + // Tag specific configuration settings (sof, timings, etc.) + if (htf < 10){ + // hitagS settings + reset_sof = 1; + t_wait = 200; + //DbpString("Configured for hitagS reader"); + } else if (htf < 20) { + // hitag1 settings + reset_sof = 1; + t_wait = 200; + //DbpString("Configured for hitag1 reader"); + } else if (htf < 30) { + // hitag2 settings + reset_sof = 4; + t_wait = HITAG_T_WAIT_2; + //DbpString("Configured for hitag2 reader"); } else { - Dbprintf("Error, unknown hitag reader type: %d",htf); - return; - } - + Dbprintf("Error, unknown hitag reader type: %d",htf); + return; + } + uint8_t attempt_count=0; while(!bStop && !BUTTON_PRESS()) { // Watchdog hit WDT_HIT(); @@ -1264,27 +1375,34 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { bStop = !hitag2_authenticate(rx,rxlen,tx,&txlen); } break; case RHT2F_CRYPTO: { - bStop = !hitag2_crypto(rx,rxlen,tx,&txlen); + bStop = !hitag2_crypto(rx,rxlen,tx,&txlen, false); } break; case RHT2F_TEST_AUTH_ATTEMPTS: { bStop = !hitag2_test_auth_attempts(rx,rxlen,tx,&txlen); } break; + case RHT2F_UID_ONLY: { + bStop = !hitag2_read_uid(rx, rxlen, tx, &txlen); + attempt_count++; //attempt 3 times to get uid then quit + if (!bStop && attempt_count == 3) bStop = true; + } break; default: { Dbprintf("Error, unknown function: %d",htf); return; } break; } - + // Send and store the reader command // Disable timer 1 with external trigger to avoid triggers during our own modulation AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; - + // Wait for HITAG_T_WAIT_2 carrier periods after the last tag bit before transmitting, // Since the clock counts since the last falling edge, a 'one' means that the // falling edge occured halfway the period. with respect to this falling edge, // we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'. // All timer values are in terms of T0 units while(AT91C_BASE_TC0->TC_CV < T0*(t_wait+(HITAG_T_TAG_HALF_PERIOD*lastbit))); + + //Dbprintf("DEBUG: Sending reader frame"); // Transmit the reader frame hitag_reader_send_frame(tx,txlen); @@ -1306,7 +1424,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { } } } - + // Reset values for receiving frames memset(rx,0x00,sizeof(rx)); rxlen = 0; @@ -1314,7 +1432,9 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { bSkip = true; tag_sof = reset_sof; response = 0; - + //Dbprintf("DEBUG: Waiting to receive frame"); + uint32_t errorCount = 0; + // Receive frame, watch for at most T0*EOF periods while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_WAIT_MAX) { // Check if falling edge in tag modulation is detected @@ -1326,23 +1446,33 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; LED_B_ON(); - + // Capture tag frame (manchester decoding using only falling edges) if(ra >= HITAG_T_EOF) { if (rxlen != 0) { - //DbpString("wierd1?"); + //Dbprintf("DEBUG: Wierd1"); } // Capture the T0 periods that have passed since last communication or field drop (reset) // We always recieve a 'one' first, which has the falling edge after a half period |-_| response = ra-HITAG_T_TAG_HALF_PERIOD; } else if(ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) { // Manchester coding example |-_|_-|-_| (101) + + //need to test to verify we don't exceed memory... + //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) { + // break; + //} rx[rxlen / 8] |= 0 << (7-(rxlen%8)); rxlen++; rx[rxlen / 8] |= 1 << (7-(rxlen%8)); rxlen++; } else if(ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) { // Manchester coding example |_-|...|_-|-_| (0...01) + + //need to test to verify we don't exceed memory... + //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) { + // break; + //} rx[rxlen / 8] |= 0 << (7-(rxlen%8)); rxlen++; // We have to skip this half period at start and add the 'one' the second time @@ -1354,6 +1484,11 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { bSkip = !bSkip; } else if(ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { // Manchester coding example |_-|_-| (00) or |-_|-_| (11) + + //need to test to verify we don't exceed memory... + //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) { + // break; + //} if (tag_sof) { // Ignore bits that are transmitted during SOF tag_sof--; @@ -1363,22 +1498,313 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) { rxlen++; } } else { + //Dbprintf("DEBUG: Wierd2"); + errorCount++; // Ignore wierd value, is to small to mean anything } } + //if we saw over 100 wierd values break it probably isn't hitag... + if (errorCount >100) break; + // We can break this loop if we received the last bit from a frame + if (AT91C_BASE_TC1->TC_CV > T0*HITAG_T_EOF) { + if (rxlen>0) break; + } + } + } + //Dbprintf("DEBUG: Done waiting for frame"); + + LED_B_OFF(); + LED_D_OFF(); + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + //Dbprintf("frame received: %d",frame_count); + //DbpString("All done"); + if (bSuccessful) + cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48); + else + cmd_send(CMD_ACK,bSuccessful,0,0,0,0); + +} + +void WriterHitag(hitag_function htf, hitag_data* htd, int page) { + int frame_count; + int response; + byte_t rx[HITAG_FRAME_LEN]; + size_t rxlen=0; + byte_t txbuf[HITAG_FRAME_LEN]; + byte_t* tx = txbuf; + size_t txlen=0; + int lastbit; + bool bSkip; + int reset_sof; + int tag_sof; + int t_wait = HITAG_T_WAIT_MAX; + bool bStop; + bool bQuitTraceFull = false; + + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + // Reset the return status + bSuccessful = false; + + // Clean up trace and prepare it for storing frames + set_tracing(true); + clear_trace(); + + //DbpString("Starting Hitag reader family"); + + // Check configuration + switch(htf) { + case WHT2F_CRYPTO: + { + DbpString("Authenticating using key:"); + memcpy(key,htd->crypto.key,6); //HACK; 4 or 6?? I read both in the code. + memcpy(writedata, htd->crypto.data, 4); + Dbhexdump(6,key,false); + blocknr = page; + bQuiet = false; + bCrypto = false; + bAuthenticating = false; + bQuitTraceFull = true; + writestate = WRITE_STATE_START; + } break; + default: { + Dbprintf("Error, unknown function: %d",htf); + return; + } break; + } + + LED_D_ON(); + hitag2_init(); + + // Configure output and enable pin that is connected to the FPGA (for modulating) + AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; + AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; + + // Set fpga in edge detect with reader field, we can modulate as reader now + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD); + + // Set Frequency divisor which will drive the FPGA and analog mux selection + FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz + SetAdcMuxFor(GPIO_MUXSEL_LOPKD); + RELAY_OFF(); + + // Disable modulation at default, which means enable the field + LOW(GPIO_SSC_DOUT); + + // Give it a bit of time for the resonant antenna to settle. + SpinDelay(30); + + // Enable Peripheral Clock for TIMER_CLOCK0, used to measure exact timing before answering + AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0); + // Enable Peripheral Clock for TIMER_CLOCK1, used to capture edges of the tag frames + AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); + AT91C_BASE_PIOA->PIO_BSR = GPIO_SSC_FRAME; + + // Disable timer during configuration + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; + + // Capture mode, defaul timer source = MCK/2 (TIMER_CLOCK1), TIOA is external trigger, + // external trigger rising edge, load RA on falling edge of TIOA. + AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK | AT91C_TC_ETRGEDG_FALLING | AT91C_TC_ABETRG | AT91C_TC_LDRA_FALLING; + + // Enable and reset counters + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + + // Reset the received frame, frame count and timing info + frame_count = 0; + response = 0; + lastbit = 1; + bStop = false; + + // Tag specific configuration settings (sof, timings, etc.) + if (htf < 10){ + // hitagS settings + reset_sof = 1; + t_wait = 200; + //DbpString("Configured for hitagS reader"); + } else if (htf < 20) { + // hitag1 settings + reset_sof = 1; + t_wait = 200; + //DbpString("Configured for hitag1 reader"); + } else if (htf < 30) { + // hitag2 settings + reset_sof = 4; + t_wait = HITAG_T_WAIT_2; + //DbpString("Configured for hitag2 reader"); + } else { + Dbprintf("Error, unknown hitag reader type: %d",htf); + return; + } + while(!bStop && !BUTTON_PRESS()) { + // Watchdog hit + WDT_HIT(); + + // Check if frame was captured and store it + if(rxlen > 0) { + frame_count++; + if (!bQuiet) { + if (!LogTraceHitag(rx,rxlen,response,0,false)) { + DbpString("Trace full"); + if (bQuitTraceFull) { + break; + } else { + bQuiet = true; + } + } + } + } + + // By default reset the transmission buffer + tx = txbuf; + switch(htf) { + case WHT2F_CRYPTO: { + bStop = !hitag2_crypto(rx,rxlen,tx,&txlen, true); + } break; + default: { + Dbprintf("Error, unknown function: %d",htf); + return; + } break; + } + + // Send and store the reader command + // Disable timer 1 with external trigger to avoid triggers during our own modulation + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; + + // Wait for HITAG_T_WAIT_2 carrier periods after the last tag bit before transmitting, + // Since the clock counts since the last falling edge, a 'one' means that the + // falling edge occured halfway the period. with respect to this falling edge, + // we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'. + // All timer values are in terms of T0 units + while(AT91C_BASE_TC0->TC_CV < T0*(t_wait+(HITAG_T_TAG_HALF_PERIOD*lastbit))); + + //Dbprintf("DEBUG: Sending reader frame"); + + // Transmit the reader frame + hitag_reader_send_frame(tx,txlen); + + // Enable and reset external trigger in timer for capturing future frames + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + + // Add transmitted frame to total count + if(txlen > 0) { + frame_count++; + if (!bQuiet) { + // Store the frame in the trace + if (!LogTraceHitag(tx,txlen,HITAG_T_WAIT_2,0,true)) { + if (bQuitTraceFull) { + break; + } else { + bQuiet = true; + } + } + } + } + + // Reset values for receiving frames + memset(rx,0x00,sizeof(rx)); + rxlen = 0; + lastbit = 1; + bSkip = true; + tag_sof = reset_sof; + response = 0; + //Dbprintf("DEBUG: Waiting to receive frame"); + uint32_t errorCount = 0; + + // Receive frame, watch for at most T0*EOF periods + while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_WAIT_MAX) { + // Check if falling edge in tag modulation is detected + if(AT91C_BASE_TC1->TC_SR & AT91C_TC_LDRAS) { + // Retrieve the new timing values + int ra = (AT91C_BASE_TC1->TC_RA/T0); + + // Reset timer every frame, we have to capture the last edge for timing + AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; + + LED_B_ON(); + + // Capture tag frame (manchester decoding using only falling edges) + if(ra >= HITAG_T_EOF) { + if (rxlen != 0) { + //Dbprintf("DEBUG: Wierd1"); + } + // Capture the T0 periods that have passed since last communication or field drop (reset) + // We always recieve a 'one' first, which has the falling edge after a half period |-_| + response = ra-HITAG_T_TAG_HALF_PERIOD; + } else if(ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) { + // Manchester coding example |-_|_-|-_| (101) + + //need to test to verify we don't exceed memory... + //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) { + // break; + //} + rx[rxlen / 8] |= 0 << (7-(rxlen%8)); + rxlen++; + rx[rxlen / 8] |= 1 << (7-(rxlen%8)); + rxlen++; + } else if(ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) { + // Manchester coding example |_-|...|_-|-_| (0...01) + + //need to test to verify we don't exceed memory... + //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) { + // break; + //} + rx[rxlen / 8] |= 0 << (7-(rxlen%8)); + rxlen++; + // We have to skip this half period at start and add the 'one' the second time + if (!bSkip) { + rx[rxlen / 8] |= 1 << (7-(rxlen%8)); + rxlen++; + } + lastbit = !lastbit; + bSkip = !bSkip; + } else if(ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) { + // Manchester coding example |_-|_-| (00) or |-_|-_| (11) + + //need to test to verify we don't exceed memory... + //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) { + // break; + //} + if (tag_sof) { + // Ignore bits that are transmitted during SOF + tag_sof--; + } else { + // bit is same as last bit + rx[rxlen / 8] |= lastbit << (7-(rxlen%8)); + rxlen++; + } + } else { + //Dbprintf("DEBUG: Wierd2"); + errorCount++; + // Ignore wierd value, is to small to mean anything + } + } + //if we saw over 100 wierd values break it probably isn't hitag... + if (errorCount >100) break; // We can break this loop if we received the last bit from a frame if (AT91C_BASE_TC1->TC_CV > T0*HITAG_T_EOF) { if (rxlen>0) break; } } + + // Wait some extra time for flash to be programmed + if ((rxlen == 0) && (writestate == WRITE_STATE_PROG)) + { + AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; + while(AT91C_BASE_TC0->TC_CV < T0*(HITAG_T_PROG - HITAG_T_WAIT_MAX)); + } } + //Dbprintf("DEBUG: Done waiting for frame"); + LED_B_OFF(); LED_D_OFF(); AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - Dbprintf("frame received: %d",frame_count); - DbpString("All done"); - cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48); + //Dbprintf("frame received: %d",frame_count); + //DbpString("All done"); + cmd_send(CMD_ACK,bSuccessful,0,0,(byte_t*)tag.sectors,48); }