ADD: AWID 50bit demod, thanks to @FrancoisM and @ntk

[proxmark3-svn] / armsrc / iso14443b.c

diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c
index a393ed58d3f9d68fedd2376fdc233125ad209bad..0c887a2539b00fafdcc8b9ecaa8c6d3e3b74f862 100644 (file)
--- a/armsrc/iso14443b.c
+++ b/armsrc/iso14443b.c
@@ -21,7 +21,8 @@
 #define TR2 0
 
 // 4sample
-#define SEND4STUFFBIT(x) ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);
+//#define SEND4STUFFBIT(x) ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);
+#define SEND4STUFFBIT(x) ToSendStuffBit(x);
 
 static void switch_off(void);
 
@@ -403,13 +404,25 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) {
        // Signal field is off with the appropriate LED
        LED_D_OFF();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
-       
+               
        StartCountSspClk();
        
+       volatile uint8_t b;
+
+       // clear receiving shift register and holding register
+       // What does this loop do? Is it TR1?
+       for(uint8_t c = 0; c < 10;) {
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       AT91C_BASE_SSC->SSC_THR = 0xFF;
+                       ++c;
+               }
+       }
+       
        // Now run a `software UART' on the stream of incoming samples.
        UartInit(received);
-       
-       uint8_t mask, b = 0;
+
+       b = 0;
+       uint8_t mask;
        while( !BUTTON_PRESS() ) {
                WDT_HIT();
 
@@ -426,27 +439,61 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) {
        return FALSE;
 }
 
+void ClearFpgaShiftingRegisters(void){
+
+       volatile uint8_t b;
+
+       // clear receiving shift register and holding register
+       while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
+       b = AT91C_BASE_SSC->SSC_RHR; (void) b;
+
+       while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
+       b = AT91C_BASE_SSC->SSC_RHR; (void) b;
+       
+               
+       // wait for the FPGA to signal fdt_indicator == 1 (the FPGA is ready to queue new data in its delay line)
+       for (uint8_t j = 0; j < 5; j++) {       // allow timeout - better late than never
+               while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
+               if (AT91C_BASE_SSC->SSC_RHR) break;
+       }
+       
+       // Clear TXRDY:
+       AT91C_BASE_SSC->SSC_THR = 0xFF;
+}
+
+void WaitForFpgaDelayQueueIsEmpty( uint16_t delay ){
+       // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
+       uint8_t fpga_queued_bits = delay >> 3;  // twich /8 ??   >>3, 
+       for (uint8_t i = 0; i <= fpga_queued_bits/8 + 1; ) {
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       AT91C_BASE_SSC->SSC_THR = 0xFF;
+                       i++;
+               }
+       }
+}
 
 static void TransmitFor14443b_AsTag( uint8_t *response, uint16_t len) {
 
                // Signal field is off with the appropriate LED
                LED_D_OFF();
+               uint16_t fpgasendQueueDelay = 0;
                
                // Modulate BPSK
                FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK);
                
-               // 8 ETU / 8bits. 8/4= 2 etus.
-               AT91C_BASE_SSC->SSC_THR = 0XFF;
-
+               ClearFpgaShiftingRegisters();
+               
                FpgaSetupSsc();
 
                // Transmit the response.
                for(uint16_t i = 0; i < len;) {
                        if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
-                               AT91C_BASE_SSC->SSC_THR = response[i];
-                               ++i;
+                               AT91C_BASE_SSC->SSC_THR = response[++i];
+                               fpgasendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        }
                }
+               
+               WaitForFpgaDelayQueueIsEmpty(fpgasendQueueDelay);
 }      
 //-----------------------------------------------------------------------------
 // Main loop of simulated tag: receive commands from reader, decide what
@@ -537,13 +584,10 @@ void SimulateIso14443bTag(uint32_t pupi) {
                // REQ or WUP request in ANY state 
                // WUP in HALTED state
                if (len == 5 ) {
-                               if ( (receivedCmd[0] == ISO14443B_REQB && (receivedCmd[2] & 0x8)== 0x8 && cardSTATE != SIM_HALTED) ||
-                    (receivedCmd[0] == ISO14443B_REQB && (receivedCmd[2] & 0x8)== 0) ){
-                                       
-                               TransmitFor14443b_AsTag( encodedATQB, encodedATQBLen );
-                               LogTrace(respATQB, sizeof(respATQB), 0, 0, NULL, FALSE);
+                               if ( (receivedCmd[0] == ISO14443B_REQB && (receivedCmd[2] & 0x8)== 0x8 && cardSTATE == SIM_HALTED) ||
+                     receivedCmd[0] == ISO14443B_REQB ){
+                               LogTrace(receivedCmd, len, 0, 0, NULL, TRUE);                                             
                                cardSTATE = SIM_SELECTING;
-                               continue;
                        }
                }
                
@@ -567,7 +611,7 @@ void SimulateIso14443bTag(uint32_t pupi) {
                        case SIM_SELECTING: {
                                TransmitFor14443b_AsTag( encodedATQB, encodedATQBLen );
                                LogTrace(respATQB, sizeof(respATQB), 0, 0, NULL, FALSE);
-                               cardSTATE = SIM_IDLE;
+                               cardSTATE = SIM_WORK;
                                break;
                        }
                        case SIM_HALTING: {