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Increased buffer sizes for hi14snoop. Added blinking LED for feedback

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daniel.boteanu 2010-01-09 15:30:47 +00:00
parent d724614963
commit 8caef54055
1 changed files with 44 additions and 14 deletions
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58
armsrc/iso14443.c
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@ -11,7 +11,10 @@
//static void GetSamplesFor14443(BOOL weTx, int n);
#define DMA_BUFFER_SIZE 256
#define DEMOD_TRACE_SIZE 4096
#define READER_TAG_BUFFER_SIZE 2048
#define TAG_READER_BUFFER_SIZE 2048
#define DMA_BUFFER_SIZE 1024
//=============================================================================
// An ISO 14443 Type B tag. We listen for commands from the reader, using
@ -1014,10 +1017,10 @@ void ReadSTMemoryIso14443(DWORD parameter,DWORD dwLast)
//-----------------------------------------------------------------------------
/*
* Memory usage for this function, (within BigBuf)
* 0-1023 : Demodulated samples receive (1024 bytes)
* 1024-1535 : Last Received command, 512 bytes (reader->tag)
* 1536-2047 : Last Received command, 512 bytes(tag->reader)
* 2048-2304 : DMA Buffer, 256 bytes (samples)
* 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
*/
void SnoopIso14443(void)
{
@ -1027,9 +1030,9 @@ void SnoopIso14443(void)
BOOL triggered = FALSE;
// The command (reader -> tag) that we're working on receiving.
BYTE *receivedCmd = (BYTE *)(BigBuf) + 1024;
BYTE *receivedCmd = (BYTE *)(BigBuf) + DEMOD_TRACE_SIZE;
// The response (tag -> reader) that we're working on receiving.
BYTE *receivedResponse = (BYTE *)(BigBuf) + 1536;
BYTE *receivedResponse = (BYTE *)(BigBuf) + DEMOD_TRACE_SIZE + READER_TAG_BUFFER_SIZE;
// As we receive stuff, we copy it from receivedCmd or receivedResponse
// into trace, along with its length and other annotations.
@ -1037,7 +1040,7 @@ void SnoopIso14443(void)
int traceLen = 0;
// The DMA buffer, used to stream samples from the FPGA.
SBYTE *dmaBuf = (SBYTE *)(BigBuf) + 2048;
SBYTE *dmaBuf = (SBYTE *)(BigBuf) + DEMOD_TRACE_SIZE + READER_TAG_BUFFER_SIZE + TAG_READER_BUFFER_SIZE;
int lastRxCounter;
SBYTE *upTo;
int ci, cq;
@ -1048,7 +1051,7 @@ void SnoopIso14443(void)
int samples = 0;
// Initialize the trace buffer
memset(trace, 0x44, 1024);
memset(trace, 0x44, DEMOD_TRACE_SIZE);
// Set up the demodulator for tag -> reader responses.
Demod.output = receivedResponse;
@ -1061,6 +1064,17 @@ void SnoopIso14443(void)
Uart.byteCntMax = 100;
Uart.state = STATE_UNSYNCD;
// Print some debug information about the buffer sizes
Dbprintf("Snooping buffers initialized:");
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);
// 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
LED_D_OFF();
@ -1076,6 +1090,16 @@ void SnoopIso14443(void)
FpgaSetupSscDma((BYTE *)dmaBuf, DMA_BUFFER_SIZE);
// 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);
if(behindBy > maxBehindBy) {
@ -1102,6 +1126,7 @@ void SnoopIso14443(void)
#define HANDLE_BIT_IF_BODY \
if(triggered) { \
ledFlashAt=30000; \
trace[traceLen++] = ((samples >> 0) & 0xff); \
trace[traceLen++] = ((samples >> 8) & 0xff); \
trace[traceLen++] = ((samples >> 16) & 0xff); \
@ -1151,7 +1176,10 @@ void SnoopIso14443(void)
trace[traceLen++] = Demod.len;
memcpy(trace+traceLen, receivedResponse, Demod.len);
traceLen += Demod.len;
if(traceLen > 1000) break;
if(traceLen > DEMOD_TRACE_SIZE) {
DbpString("Reached trace limit");
goto done;
}
triggered = TRUE;
@ -1168,11 +1196,13 @@ void SnoopIso14443(void)
}
}
DbpString("in done pt");
Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, 0x23);
done:
LED_D_OFF();
AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
DbpString("Snoop statistics:");
Dbprintf(" Max behind by: %i", maxBehindBy);
Dbprintf(" Uart State: %x", Uart.state);
Dbprintf(" Uart ByteCnt: %i", Uart.byteCnt);
Dbprintf(" Uart ByteCntMax: %i", Uart.byteCntMax);
Dbprintf(" Trace length: %i", traceLen);
}