ADD: @holiman's clearCommandBuffer in cmdlft55xx.c

[proxmark3-svn] / armsrc / iso14443b.c

diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c
index 2bdce7cbae981592dcefe14faf18b38526677bc5..7423a8ed335b60c9782e3f6e60cb122af5cc8334 100644 (file)
--- a/armsrc/iso14443b.c
+++ b/armsrc/iso14443b.c
@@ -13,13 +13,12 @@
 #include "apps.h"
 #include "util.h"
 #include "string.h"
-
 #include "iso14443crc.h"
-
-#define RECEIVE_SAMPLES_TIMEOUT 0x0004FFFF
+#include "common.h"
+#define RECEIVE_SAMPLES_TIMEOUT 800000
 #define ISO14443B_DMA_BUFFER_SIZE 256
 
-uint8_t PowerOn = TRUE;
+
 // PCB Block number for APDUs
 static uint8_t pcb_blocknum = 0;
 
@@ -107,7 +106,7 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len)
                ToSendStuffBit(0);
                ToSendStuffBit(0);
        }
-       for(i = 0; i < 2; i++) {
+       for(i = 0; i < 10; i++) {
                ToSendStuffBit(1);
                ToSendStuffBit(1);
                ToSendStuffBit(1);
@@ -270,6 +269,7 @@ static void UartReset()
        Uart.state = STATE_UNSYNCD;
        Uart.byteCnt = 0;
        Uart.bitCnt = 0;
+       Uart.posCnt = 0;
        memset(Uart.output, 0x00, MAX_FRAME_SIZE);
 }
 
@@ -528,15 +528,12 @@ static struct {
 static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 {
        int v;
+       int ai, aq;
 
 // The soft decision on the bit uses an estimate of just the
 // quadrant of the reference angle, not the exact angle.
 #define MAKE_SOFT_DECISION() { \
-               if(Demod.sumI > 0) { \
-                       v = ci; \
-               } else { \
-                       v = -ci; \
-               } \
+               v = (Demod.sumI > 0) ? ci : -ci;\
                if(Demod.sumQ > 0) { \
                        v += cq; \
                } else { \
@@ -557,39 +554,15 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
                } \
        }               
  */
+
 // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
 #define CHECK_FOR_SUBCARRIER() { \
-               if(ci < 0) { \
-                       if(cq < 0) { /* ci < 0, cq < 0 */ \
-                               if (cq < ci) { \
-                                       v = -cq - (ci >> 1); \
-                               } else { \
-                                       v = -ci - (cq >> 1); \
-                               } \
-                       } else {        /* ci < 0, cq >= 0 */ \
-                               if (cq < -ci) { \
-                                       v = -ci + (cq >> 1); \
-                               } else { \
-                                       v = cq - (ci >> 1); \
-                               } \
-                       } \
-               } else { \
-                       if(cq < 0) { /* ci >= 0, cq < 0 */ \
-                               if (-cq < ci) { \
-                                       v = ci - (cq >> 1); \
-                               } else { \
-                                       v = -cq + (ci >> 1); \
-                               } \
-                       } else {        /* ci >= 0, cq >= 0 */ \
-                               if (cq < ci) { \
-                                       v = ci + (cq >> 1); \
-                               } else { \
-                                       v = cq + (ci >> 1); \
-                               } \
-                       } \
-               } \
-       }
-       
+               ai = (abs(ci) >> 1); \
+               aq = (abs(cq) >> 1); \
+               v = MAX(abs(ci), abs(cq)) + MIN(ai, aq); \
+}
+
+
        switch(Demod.state) {
                case DEMOD_UNSYNCD:
                        CHECK_FOR_SUBCARRIER();
@@ -620,11 +593,11 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 
                case DEMOD_AWAITING_FALLING_EDGE_OF_SOF:
                        MAKE_SOFT_DECISION();
+                       //Dbprintf("ICE: %d %d %d %d %d", v, Demod.sumI, Demod.sumQ, ci, cq );
                        if(v < 0) {     // logic '0' detected
                                Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
                                Demod.posCount = 0;     // start of SOF sequence
                        } else {
-                               //if(Demod.posCount > 200/4) {  // maximum length of TR1 = 200 1/fs
                                if(Demod.posCount > 25*2) {     // maximum length of TR1 = 200 1/fs
                                        Demod.state = DEMOD_UNSYNCD;
                                }
@@ -731,6 +704,11 @@ static void DemodReset()
        Demod.len = 0;
        Demod.state = DEMOD_UNSYNCD;
        Demod.posCount = 0;
+       Demod.sumI = 0;
+       Demod.sumQ = 0;
+       Demod.bitCount = 0;
+       Demod.thisBit = 0;
+       Demod.shiftReg = 0;
        memset(Demod.output, 0x00, MAX_FRAME_SIZE);
 }
 
@@ -760,25 +738,20 @@ static void GetSamplesFor14443bDemod(int n, bool quiet)
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
 
        // The response (tag -> reader) that we're receiving.
-       uint8_t *resp = BigBuf_malloc(MAX_FRAME_SIZE);
-
        // Set up the demodulator for tag -> reader responses.
-       DemodInit(resp);
+       DemodInit(BigBuf_malloc(MAX_FRAME_SIZE));
        
        // The DMA buffer, used to stream samples from the FPGA
        int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE);
 
-
+       // Setup and start DMA.
+       FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE);
+       
        int8_t *upTo = dmaBuf;
        lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
 
        // Signal field is ON with the appropriate LED:
        LED_D_ON();
-
-       // Setup and start DMA.
-       FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE);
-
-       
        for(;;) {
                int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR;
                if(behindBy > max) max = behindBy;
@@ -799,11 +772,11 @@ static void GetSamplesFor14443bDemod(int n, bool quiet)
 
                        samples += 2;
 
-                       if(Handle14443bSamplesDemod(ci | 0x01 , cq | 0x01)) {
-                               gotFrame = TRUE;
+                       //
+                       gotFrame = Handle14443bSamplesDemod(ci , cq );
+                       if ( gotFrame )
                                break;
                }
-       }
 
                if(samples > n || gotFrame) {
                        break;
@@ -839,9 +812,6 @@ static void TransmitFor14443b(void)
        int c;
 
        FpgaSetupSsc();
-
-       // Start the timer
-       StartCountSspClk();
        
        while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                AT91C_BASE_SSC->SSC_THR = 0xff;
@@ -852,8 +822,6 @@ static void TransmitFor14443b(void)
        // Signal we are transmitting with the Green LED
        LED_B_ON();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
-       if ( !PowerOn )
-               SpinDelay(200);
        
        for(c = 0; c < 10;) {
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
@@ -898,7 +866,7 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len)
        ToSendReset();
 
        // Establish initial reference level
-       for(i = 0; i < 80; i++) {
+       for(i = 0; i < 40; i++) {
                ToSendStuffBit(1);
        }
        // Send SOF
@@ -1032,7 +1000,9 @@ int iso14443b_select_card()
 
 // Set up ISO 14443 Type B communication (similar to iso14443a_setup)
 void iso14443b_setup() {
+
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
        BigBuf_free();
        // Set up the synchronous serial port
        FpgaSetupSsc();
@@ -1044,7 +1014,7 @@ void iso14443b_setup() {
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
 
        // Start the timer
-       StartCountSspClk();
+       //StartCountSspClk();
 
        DemodReset();
        UartReset();
@@ -1353,22 +1323,10 @@ void RAMFUNC SnoopIso14443b(void)
 void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[])
 {
        iso14443b_setup();
-       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
-       BigBuf_free();
-       if ( !PowerOn ){
-               FpgaSetupSsc();
-       }
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-       
-       // Start the timer
-       StartCountSspClk();
-
-       DemodReset();
-       UartReset();
        
        if ( datalen == 0 && recv == 0 && powerfield == 0){
-               clear_trace();
-       } else {
+               
+       } else {                
                set_tracing(TRUE);
                CodeAndTransmit14443bAsReader(data, datalen);
        }
@@ -1383,7 +1341,6 @@ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, u
                FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
                FpgaDisableSscDma();
                LED_D_OFF();
-               PowerOn = 0;
        }
 }