Added a comment

[proxmark3-svn] / armsrc / iso14443.c

diff --git a/armsrc/iso14443.c b/armsrc/iso14443.c
index 1f722a6d4d76786d50e5b87312f6001f7fe732f1..9452ae83091c7415dee11fb65d4d3001a545be5d 100644 (file)
--- a/armsrc/iso14443.c
+++ b/armsrc/iso14443.c
@@ -22,7 +22,7 @@
 #define DEMOD_TRACE_SIZE 4096
 #define READER_TAG_BUFFER_SIZE 2048
 #define TAG_READER_BUFFER_SIZE 2048
-#define DMA_BUFFER_SIZE 1024
+#define DEMOD_DMA_BUFFER_SIZE 1024
 
 //=============================================================================
 // An ISO 14443 Type B tag. We listen for commands from the reader, using
@@ -465,7 +465,7 @@ static struct {
  *          false if we are still waiting for some more
  *
  */
-static int Handle14443SamplesDemod(int ci, int cq)
+static RAMFUNC int Handle14443SamplesDemod(int ci, int cq)
 {
     int v;
 
@@ -652,8 +652,8 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
     // Setup for the DMA.
     dmaBuf = (int8_t *)(BigBuf + 32);
     upTo = dmaBuf;
-    lastRxCounter = DMA_BUFFER_SIZE;
-    FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
+    lastRxCounter = DEMOD_DMA_BUFFER_SIZE;
+    FpgaSetupSscDma((uint8_t *)dmaBuf, DEMOD_DMA_BUFFER_SIZE);
 
     // Signal field is ON with the appropriate LED:
        if (weTx) LED_D_ON(); else LED_D_OFF();
@@ -666,20 +666,20 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
         int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR;
         if(behindBy > max) max = behindBy;
 
-        while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (DMA_BUFFER_SIZE-1))
+        while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (DEMOD_DMA_BUFFER_SIZE-1))
                     > 2)
         {
             ci = upTo[0];
             cq = upTo[1];
             upTo += 2;
-            if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
-                upTo -= DMA_BUFFER_SIZE;
+            if(upTo - dmaBuf > DEMOD_DMA_BUFFER_SIZE) {
+                upTo -= DEMOD_DMA_BUFFER_SIZE;
                 AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
-                AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+                AT91C_BASE_PDC_SSC->PDC_RNCR = DEMOD_DMA_BUFFER_SIZE;
             }
             lastRxCounter -= 2;
             if(lastRxCounter <= 0) {
-                lastRxCounter += DMA_BUFFER_SIZE;
+                lastRxCounter += DEMOD_DMA_BUFFER_SIZE;
             }
 
             samples += 2;
@@ -1028,14 +1028,14 @@ void ReadSTMemoryIso14443(uint32_t parameter,uint32_t dwLast)
  * 0-4095 : Demodulated samples receive (4096 bytes) - DEMOD_TRACE_SIZE
  * 4096-6143 : Last Received command, 2048 bytes (reader->tag) - READER_TAG_BUFFER_SIZE
  * 6144-8191 : Last Received command, 2048 bytes(tag->reader) - TAG_READER_BUFFER_SIZE
- * 8192-9215 : DMA Buffer, 1024 bytes (samples) - DMA_BUFFER_SIZE
+ * 8192-9215 : DMA Buffer, 1024 bytes (samples) - DEMOD_DMA_BUFFER_SIZE
  */
-void SnoopIso14443(void)
+void RAMFUNC SnoopIso14443(void)
 {
     // We won't start recording the frames that we acquire until we trigger;
     // a good trigger condition to get started is probably when we see a
     // response from the tag.
-    int triggered = FALSE;
+    int triggered = TRUE;
 
     // The command (reader -> tag) that we're working on receiving.
     uint8_t *receivedCmd = (uint8_t *)(BigBuf) + DEMOD_TRACE_SIZE;
@@ -1077,11 +1077,8 @@ void SnoopIso14443(void)
        Dbprintf("  Trace: %i bytes", DEMOD_TRACE_SIZE);
        Dbprintf("  Reader -> tag: %i bytes", READER_TAG_BUFFER_SIZE);
        Dbprintf("  tag -> Reader: %i bytes", TAG_READER_BUFFER_SIZE);
-       Dbprintf("  DMA: %i bytes", DMA_BUFFER_SIZE);
+       Dbprintf("  DMA: %i bytes", DEMOD_DMA_BUFFER_SIZE);
 
-       // Use a counter for blinking the LED
-       long ledCount=0;
-       long ledFlashAt=200000;
 
     // And put the FPGA in the appropriate mode
     // Signal field is off with the appropriate LED
@@ -1094,25 +1091,18 @@ void SnoopIso14443(void)
     // Setup for the DMA.
     FpgaSetupSsc();
     upTo = dmaBuf;
-    lastRxCounter = DMA_BUFFER_SIZE;
-    FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
+    lastRxCounter = DEMOD_DMA_BUFFER_SIZE;
+    FpgaSetupSscDma((uint8_t *)dmaBuf, DEMOD_DMA_BUFFER_SIZE);
+               
+    LED_A_ON();
+               
     // And now we loop, receiving samples.
     for(;;) {
-               // Blink the LED while Snooping
-               ledCount++;
-               if (ledCount == ledFlashAt) {
-                       LED_D_ON();
-               }
-               if (ledCount >= 2*ledFlashAt) {
-                       LED_D_OFF();
-                       ledCount=0;
-               }
-
        int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
-                                (DMA_BUFFER_SIZE-1);
+                                (DEMOD_DMA_BUFFER_SIZE-1);
         if(behindBy > maxBehindBy) {
             maxBehindBy = behindBy;
-            if(behindBy > (DMA_BUFFER_SIZE-2)) { // TODO: understand whether we can increase/decrease as we want or not?
+            if(behindBy > (DEMOD_DMA_BUFFER_SIZE-2)) { // TODO: understand whether we can increase/decrease as we want or not?
                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
                 goto done;
             }
@@ -1123,18 +1113,17 @@ void SnoopIso14443(void)
         cq = upTo[1];
         upTo += 2;
         lastRxCounter -= 2;
-        if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
-            upTo -= DMA_BUFFER_SIZE;
-            lastRxCounter += DMA_BUFFER_SIZE;
+        if(upTo - dmaBuf > DEMOD_DMA_BUFFER_SIZE) {
+            upTo -= DEMOD_DMA_BUFFER_SIZE;
+            lastRxCounter += DEMOD_DMA_BUFFER_SIZE;
             AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
-            AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+            AT91C_BASE_PDC_SSC->PDC_RNCR = DEMOD_DMA_BUFFER_SIZE;
         }
 
         samples += 2;
 
 #define HANDLE_BIT_IF_BODY \
             if(triggered) { \
-                               ledFlashAt=30000; \
                 trace[traceLen++] = ((samples >>  0) & 0xff); \
                 trace[traceLen++] = ((samples >>  8) & 0xff); \
                 trace[traceLen++] = ((samples >> 16) & 0xff); \
@@ -1190,6 +1179,8 @@ void SnoopIso14443(void)
                        }
 
             triggered = TRUE;
+            LED_A_OFF();
+            LED_B_ON();
 
             // And ready to receive another response.
             memset(&Demod, 0, sizeof(Demod));
@@ -1205,10 +1196,12 @@ void SnoopIso14443(void)
     }
 
 done:
-       LED_D_OFF();
-    AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
+       LED_A_OFF();
+       LED_B_OFF();
+       LED_C_OFF();
+  AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
        DbpString("Snoop statistics:");
-    Dbprintf("  Max behind by: %i", maxBehindBy);
+  Dbprintf("  Max behind by: %i", maxBehindBy);
        Dbprintf("  Uart State: %x", Uart.state);
        Dbprintf("  Uart ByteCnt: %i", Uart.byteCnt);
        Dbprintf("  Uart ByteCntMax: %i", Uart.byteCntMax);