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-rw-r--r--openpicc/application/iso14443.h96
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_*/
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