Merge pull request #477 from merlokk/wtx

 Added work with S-Block WTX in 14a apdu on arm side

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index 8e2c56b04638947c4ef50240be0d8904cc09e1f5..ebbddbd89a29a02646945f0768fde298badc8daa 100644 (file)
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -1875,7 +1875,30 @@ void iso14443a_setup(uint8_t fpga_minor_mode) {
        iso14a_set_timeout(1060); // 10ms default
 }
 
-
+/* Peter Fillmore 2015
+Added card id field to the function
+ info from ISO14443A standard
+b1 = Block Number
+b2 = RFU (always 1)
+b3 = depends on block
+b4 = Card ID following if set to 1
+b5 = depends on block type
+b6 = depends on block type
+b7,b8 = block type.
+Coding of I-BLOCK:
+b8 b7 b6 b5 b4 b3 b2 b1
+0  0  0  x  x  x  1  x
+b5 = chaining bit
+Coding of R-block:
+b8 b7 b6 b5 b4 b3 b2 b1
+1  0  1  x  x  0  1  x
+b5 = ACK/NACK
+Coding of S-block:
+b8 b7 b6 b5 b4 b3 b2 b1
+1  1  x  x  x  0  1  0 
+b5,b6 = 00 - DESELECT
+        11 - WTX 
+*/    
 int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
        uint8_t parity[MAX_PARITY_SIZE];
        uint8_t real_cmd[cmd_len + 4];
@@ -1894,10 +1917,23 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
 
        if (!len) {
                return 0; //DATA LINK ERROR
-               
-       // if we received an I- or R(ACK)-Block with a block number equal to the
-       // current block number, toggle the current block number
        } else{
+               // S-Block WTX 
+               while((data_bytes[0] & 0xF2) == 0xF2) {
+                       // Transmit WTX back 
+                       // byte1 - WTXM [1..59]. command FWT=FWT*WTXM
+                       data_bytes[1] = data_bytes[1] & 0x3f; // 2 high bits mandatory set to 0b
+                       // now need to fix CRC.
+                       AppendCrc14443a(data_bytes, len - 2);
+                       // transmit S-Block
+                       ReaderTransmit(data_bytes, len, NULL);
+                       // retrieve the result again 
+                       len = ReaderReceive(data, parity);
+                       data_bytes = data;
+               }
+
+               // if we received an I- or R(ACK)-Block with a block number equal to the
+               // current block number, toggle the current block number
                if (len >= 3 // PCB+CRC = 3 bytes
                 && ((data_bytes[0] & 0xC0) == 0 // I-Block
                     || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0