1 files changed, 96 insertions, 0 deletions
diff --git a/openpicc/application/iso14443.h b/openpicc/application/iso14443.h
new file mode 100644
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--- /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_*/