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author | henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2008-03-02 02:32:08 +0000 |
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committer | henryk <henryk@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> | 2008-03-02 02:32:08 +0000 |
commit | 2f730c90916047ec0b419ed9469fa44f537b8ab6 (patch) | |
tree | 1c5d8ee76b842f49d8d3ce989cc1bd56faae0704 /openpicc/application/iso14443.h | |
parent | 5b3bd67fb9c780d51b25b5304589b1aab0a1e8a7 (diff) |
Forgotten include file
git-svn-id: https://svn.openpcd.org:2342/trunk@436 6dc7ffe9-61d6-0310-9af1-9938baff3ed1
Diffstat (limited to 'openpicc/application/iso14443.h')
-rw-r--r-- | openpicc/application/iso14443.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/openpicc/application/iso14443.h b/openpicc/application/iso14443.h new file mode 100644 index 0000000..cc7a640 --- /dev/null +++ b/openpicc/application/iso14443.h @@ -0,0 +1,96 @@ +#ifndef ISO14443_H_ +#define ISO14443_H_ + +/******************** RX ************************************/ +#define ISO14443_BITS_PER_SSC_TRANSFER 4 + +#ifdef FOUR_TIMES_OVERSAMPLING +/* definitions for four-times oversampling */ +#define ISO14443A_SAMPLE_LEN 4 +/* Sample values for the REQA and WUPA short frames */ +#define REQA 0x10410441 +#define WUPA 0x04041041 + +/* Start of frame sample for SSC compare 0 */ +#define ISO14443A_SOF_SAMPLE 0x01 +#define ISO14443A_SOF_LEN 4 +/* Length in samples of a short frame */ +#define ISO14443A_SHORT_LEN 32 +/* This is wrong: a short frame is 1 start bit, 7 data bits, 1 stop bit + * followed by no modulation for one bit period. The start bit is 'eaten' in + * SSC Compare 0, but the remaining 7+1+1 bit durations must be sampled and + * compared. At four times oversampling this would be 9*4=36 samples, which is + * more than one SSC transfer. You'd have to use two transfers of 18 samples + * each and modify the comparison code accordingly. + * Since four times oversampling doesn't work reliably anyway (every second + * sample is near an edge and might sample 0 or 1) this doesn't matter for now.*/ +#error Four times oversampling is broken, see comments in code + +#else +/* definitions for two-times oversampling */ +#define ISO14443A_SAMPLE_LEN 2 + +/* For SSC_MODE_ISO14443A_SHORT */ +#define ISO14443A_SHORT_LEN 18 +#define REQA 0x4929 +#define WUPA 0x2249 + +#define ISO14443A_SOF_SAMPLE 0x01 +#define ISO14443A_SOF_LEN 2 + +#define ISO14443A_EOF_SAMPLE 0x00 +#define ISO14443A_EOF_LEN 7 + +/* For SSC_MODE_ISO14443A */ +#define ISO14443A_SHORT_FRAME_COMPARE_LENGTH 2 +#define _ISO14443A_SHORT_FRAME_REQA { 0x29, 0x49 } +#define _ISO14443A_SHORT_FRAME_WUPA { 0x49, 0x22 } +// FIXME not correct. This should be compare_length == 3 (which is 9 samples at 4 per compare), but this +// needs enhanced ssc irq code to transfer the last read (incomplete) data from the ssc holding +// register to the buffer + +#endif + +/* A short frame should be received in one single SSC transfer */ +#if (ISO14443A_SHORT_LEN <= 8) +/* SSC transfer size in bits */ +#define ISO14443A_SHORT_TRANSFER_SIZE 8 +#define ISO14443A_SHORT_TYPE u_int8_t + +#elif (ISO14443A_SHORT_LEN <= 16) +#define ISO14443A_SHORT_TRANSFER_SIZE 16 +#define ISO14443A_SHORT_TYPE u_int16_t + +#elif (ISO14443A_SHORT_LEN <= 32) +#define ISO14443A_SHORT_TRANSFER_SIZE 32 +#define ISO14443A_SHORT_TYPE u_int32_t + +#else +#error ISO14443A_SHORT_LEN defined too big +#endif + + +/******************** RX and TX *****************************/ +/* in bytes, not counting parity */ +#define MAXIMUM_FRAME_SIZE 256 +#define ISO14443A_MAX_RX_FRAME_SIZE_IN_BITS (MAXIMUM_FRAME_SIZE*9 +2) + +typedef struct { + enum { TYPE_A, TYPE_B } type; + union { + struct { + enum { SHORT_FRAME, STANDARD_FRAME, AC_FRAME } format; + enum { PARITY, /* Calculate parity on the fly, ignore the parity field below */ + GIVEN_PARITY, /* Use the parity bits from the parity field below */ + NO_PARITY, /* Don't send any parity */ + } parity; + enum { ISO14443A_LAST_BIT_0 = 0, ISO14443A_LAST_BIT_1 = 1, ISO14443A_LAST_BIT_NONE } last_bit; + } a; + } parameters; + u_int32_t numbytes; + u_int8_t numbits, bit_offset; + u_int8_t data[MAXIMUM_FRAME_SIZE]; + u_int8_t parity[MAXIMUM_FRAME_SIZE/8+1]; /* parity bit for data[x] is in parity[x/8] & (1<<(x%8)) */ +} iso14443_frame; + +#endif /*ISO14443_H_*/ |