108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
#ifndef ISO14443_LAYER3A_H_
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#define ISO14443_LAYER3A_H_
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extern void iso14443_layer3a_state_machine (void *pvParameters);
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enum ISO14443_STATES {
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STARTING_UP, /* Hardware has not been initialized, initialize hardware, go to power-off */
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POWERED_OFF, /* Card not in field, wait for PLL lock */
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IDLE, /* Card in field and powered, wait for REQA or WUPA */
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READY, /* Perform anticollision, wait for select */
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ACTIVE, /* Selected */
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HALT, /* Card halted and powered, wait for WUPA */
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READY_STAR, /* Perform anticollision, wait for select */
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ACTIVE_STAR, /* Selected */
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ERROR, /* Some unrecoverable error has occured */
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};
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/******************** RX ************************************/
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#ifdef FOUR_TIMES_OVERSAMPLING
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/* definitions for four-times oversampling */
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/* Sample values for the REQA and WUPA short frames */
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#define REQA 0x10410441
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#define WUPA 0x04041041
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/* Start of frame sample for SSC compare 0 */
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#define ISO14443A_SOF_SAMPLE 0x01
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#define ISO14443A_SOF_LEN 4
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/* Length in samples of a short frame */
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#define ISO14443A_SHORT_LEN 32
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/* This is wrong: a short frame is 1 start bit, 7 data bits, 1 stop bit
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* followed by no modulation for one bit period. The start bit is 'eaten' in
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* SSC Compare 0, but the remaining 7+1+1 bit durations must be sampled and
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* compared. At four times oversampling this would be 9*4=36 samples, which is
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* more than one SSC transfer. You'd have to use two transfers of 18 samples
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* each and modify the comparison code accordingly.
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* Since four times oversampling doesn't work reliably anyway (every second
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* sample is near an edge and might sample 0 or 1) this doesn't matter for now.*/
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#error Four times oversampling is broken, see comments in code
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#else
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/* definitions for two-times oversampling */
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#define REQA 0x4929
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#define WUPA 0x2249
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#define ISO14443A_SOF_SAMPLE 0x01
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#define ISO14443A_SOF_LEN 2
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#define ISO14443A_SHORT_LEN 18
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#endif
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/* A short frame should be received in one single SSC transfer */
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#if (ISO14443A_SHORT_LEN <= 8)
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/* SSC transfer size in bits */
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#define ISO14443A_SHORT_TRANSFER_SIZE 8
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#define ISO14443A_SHORT_TYPE u_int8_t
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#elif (ISO14443A_SHORT_LEN <= 16)
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#define ISO14443A_SHORT_TRANSFER_SIZE 16
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#define ISO14443A_SHORT_TYPE u_int16_t
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#elif (ISO14443A_SHORT_LEN <= 32)
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#define ISO14443A_SHORT_TRANSFER_SIZE 32
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#define ISO14443A_SHORT_TYPE u_int32_t
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#else
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#error ISO14443A_SHORT_LEN defined too big
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#endif
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/******************** TX ************************************/
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/* Magic delay, don't know where it comes from */
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#define MAGIC_OFFSET -32
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/* Delay from modulation till detection in SSC_DATA */
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#define DETECTION_DELAY 11
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/* See fdt_timinig.dia for these values */
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#define MAX_TF_FIQ_ENTRY_DELAY 16
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#define MAX_TF_FIQ_OVERHEAD 75 /* guesstimate */
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extern volatile int fdt_offset;
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/* standard derived magic values */
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#define ISO14443A_FDT_SLOTLEN 128
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#define ISO14443A_FDT_OFFSET_1 84
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#define ISO14443A_FDT_OFFSET_0 20
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#define ISO14443A_FDT_SHORT_1 (ISO14443A_FDT_SLOTLEN*9 + ISO14443A_FDT_OFFSET_1 +fdt_offset +MAGIC_OFFSET -DETECTION_DELAY)
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#define ISO14443A_FDT_SHORT_0 (ISO14443A_FDT_SLOTLEN*9 + ISO14443A_FDT_OFFSET_0 +fdt_offset +MAGIC_OFFSET -DETECTION_DELAY)
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/* in bytes, not counting parity */
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#define MAXIMUM_FRAME_SIZE 256
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typedef struct {
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enum { TYPE_A, TYPE_B } type;
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union {
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struct {
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enum { SHORT_FRAME, STANDARD_FRAME, AC_FRAME } format;
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enum { PARITY, /* Calculate parity on the fly, ignore the parity field below */
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GIVEN_PARITY, /* Use the parity bits from the parity field below */
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NO_PARITY, /* Don't send any parity */
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} parity;
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} a;
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} parameters;
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u_int32_t numbytes;
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u_int8_t numbits, bit_offset;
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u_int8_t data[MAXIMUM_FRAME_SIZE];
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u_int8_t parity[MAXIMUM_FRAME_SIZE/8+1]; /* parity bit for data[x] is in parity[x/8] & (1<<(x%8)) */
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} iso14443_frame;
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extern const iso14443_frame ATQA_FRAME;
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#endif /*ISO14443_LAYER3A_H_*/
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