Merge pull request #215 from AdamLaurie/master

[proxmark3-svn] / armsrc / hitag2.c

diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c
index c565511ce620525c0501d0118ef8590ec87d4756..d79b29fef21785df58d1173ae2603cece3d74269 100644 (file)
--- a/armsrc/hitag2.c
+++ b/armsrc/hitag2.c
@@ -1203,6 +1203,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                        bQuiet = false;
                        bCrypto = false;
                        bAuthenticating = false;
+                       bQuitTraceFull = true;
                } break;
                default: {
                        Dbprintf("Error, unknown function: %d",htf);
@@ -1331,6 +1332,8 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                // we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'.
                // All timer values are in terms of T0 units
                while(AT91C_BASE_TC0->TC_CV < T0*(t_wait+(HITAG_T_TAG_HALF_PERIOD*lastbit)));
+                       
+                       //Dbprintf("DEBUG: Sending reader frame");
                
                // Transmit the reader frame
                hitag_reader_send_frame(tx,txlen);
@@ -1360,7 +1363,9 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                bSkip = true;
                tag_sof = reset_sof;
                response = 0;
-               
+                       //Dbprintf("DEBUG: Waiting to receive frame");
+               uint32_t errorCount = 0;
+
                // Receive frame, watch for at most T0*EOF periods
                while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_WAIT_MAX) {
                        // Check if falling edge in tag modulation is detected
@@ -1376,19 +1381,29 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                                // Capture tag frame (manchester decoding using only falling edges)
                                if(ra >= HITAG_T_EOF) {
                                        if (rxlen != 0) {
-                                               //DbpString("wierd1?");
+                                               //Dbprintf("DEBUG: Wierd1");
                                        }
                                        // Capture the T0 periods that have passed since last communication or field drop (reset)
                                        // We always recieve a 'one' first, which has the falling edge after a half period |-_|
                                        response = ra-HITAG_T_TAG_HALF_PERIOD;
                                } else if(ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) {
                                        // Manchester coding example |-_|_-|-_| (101)
+
+                                       //need to test to verify we don't exceed memory...
+                                       //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+                                       //      break;
+                                       //}
                                        rx[rxlen / 8] |= 0 << (7-(rxlen%8));
                                        rxlen++;
                                        rx[rxlen / 8] |= 1 << (7-(rxlen%8));
                                        rxlen++;
                                } else if(ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) {
                                        // Manchester coding example |_-|...|_-|-_| (0...01)
+                                       
+                                       //need to test to verify we don't exceed memory...
+                                       //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+                                       //      break;
+                                       //}
                                        rx[rxlen / 8] |= 0 << (7-(rxlen%8));
                                        rxlen++;
                                        // We have to skip this half period at start and add the 'one' the second time 
@@ -1400,6 +1415,11 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                                        bSkip = !bSkip;
                                } else if(ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) {
                                        // Manchester coding example |_-|_-| (00) or |-_|-_| (11)
+
+                                       //need to test to verify we don't exceed memory...
+                                       //if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
+                                       //      break;
+                                       //}
                                        if (tag_sof) {
                                                // Ignore bits that are transmitted during SOF
                                                tag_sof--;
@@ -1409,16 +1429,21 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
                                                rxlen++;
                                        }
                                } else {
+                                               //Dbprintf("DEBUG: Wierd2");
+                                               errorCount++;
                                        // Ignore wierd value, is to small to mean anything
                                }
                        }
-
+                       //if we saw over 100 wierd values break it probably isn't hitag...
+                       if (errorCount >100) break;
                        // We can break this loop if we received the last bit from a frame
                        if (AT91C_BASE_TC1->TC_CV > T0*HITAG_T_EOF) {
                                if (rxlen>0) break;
                        }
                }
        }
+       //Dbprintf("DEBUG: Done waiting for frame");
+       
        LED_B_OFF();
        LED_D_OFF();
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;