new command "lf snoop" to snoop raw ADC values

[proxmark3-svn] / armsrc / lfops.c

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index a0fa870b62bf7e1e5e4a5dca76682406a8d83f1b..6b131c2617b6eca741dc34a3fe5d62e8a8606f89 100644 (file)
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -15,7 +15,7 @@
 #include "crc16.h"
 #include "string.h"
 
-void AcquireRawAdcSamples125k(int divisor)
+void LFSetupFPGAForADC(int divisor, bool lf_field)
 {
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        if ( (divisor == 1) || (divisor < 0) || (divisor > 255) )
@@ -25,23 +25,30 @@ void AcquireRawAdcSamples125k(int divisor)
        else
                FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor);
 
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | (lf_field ? FPGA_LF_ADC_READER_FIELD : 0));
 
        // Connect the A/D to the peak-detected low-frequency path.
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
-
        // Give it a bit of time for the resonant antenna to settle.
        SpinDelay(50);
-
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        FpgaSetupSsc();
+}
+
+void AcquireRawAdcSamples125k(int divisor)
+{
+       LFSetupFPGAForADC(divisor, true);
+       DoAcquisition125k(-1);
+}
 
-       // Now call the acquisition routine
-       DoAcquisition125k();
+void SnoopLFRawAdcSamples(int divisor, int trigger_threshold)
+{
+       LFSetupFPGAForADC(divisor, false);
+       DoAcquisition125k(trigger_threshold);
 }
 
 // split into two routines so we can avoid timing issues after sending commands //
-void DoAcquisition125k(void)
+void DoAcquisition125k(int trigger_threshold)
 {
        uint8_t *dest = (uint8_t *)BigBuf;
        int n = sizeof(BigBuf);
@@ -56,9 +63,12 @@ void DoAcquisition125k(void)
                }
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
                        dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-                       i++;
                        LED_D_OFF();
-                       if (i >= n) break;
+                       if (trigger_threshold != -1 && dest[i] < trigger_threshold)
+                               continue;
+                       else
+                               trigger_threshold = -1;
+                       if (++i >= n) break;
                }
        }
        Dbprintf("buffer samples: %02x %02x %02x %02x %02x %02x %02x %02x ...",
@@ -85,7 +95,7 @@ void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1,
        else
                FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
 
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 
        // Give it a bit of time for the resonant antenna to settle.
        SpinDelay(50);
@@ -105,7 +115,7 @@ void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1,
                else
                        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
 
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+               FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
                LED_D_ON();
                if(*(command++) == '0')
                        SpinDelayUs(period_0);
@@ -120,10 +130,10 @@ void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1,
        else
                FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
 
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 
        // now do the read
-       DoAcquisition125k();
+       DoAcquisition125k(-1);
 }
 
 /* blank r/w tag data stream
@@ -609,7 +619,7 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 
        // Connect the A/D to the peak-detected low-frequency path.
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
@@ -823,7 +833,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 
        // Connect the A/D to the peak-detected low-frequency path.
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
@@ -1141,7 +1151,7 @@ void T55xxWriteBit(int bit)
 {
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
        if (bit == 0)
                SpinDelayUs(WRITE_0);
        else
@@ -1157,7 +1167,7 @@ void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMod
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 
        // Give it a bit of time for the resonant antenna to settle.
        // And for the tag to fully power up
@@ -1189,7 +1199,7 @@ void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMod
        // Now perform write (nominal is 5.6 ms for T55x7 and 18ms for E5550,
        // so wait a little more)
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
        SpinDelay(20);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 }
@@ -1211,7 +1221,7 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
   
        LED_D_ON();
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
   
        // Give it a bit of time for the resonant antenna to settle.
        // And for the tag to fully power up
@@ -1237,7 +1247,7 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
   
   // Turn field on to read the response
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
   
        // Now do the acquisition
        i = 0;
@@ -1276,7 +1286,7 @@ void T55xxReadTrace(void){
   
        LED_D_ON();
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
   
        // Give it a bit of time for the resonant antenna to settle.
        // And for the tag to fully power up
@@ -1292,7 +1302,7 @@ void T55xxReadTrace(void){
   
   // Turn field on to read the response
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
   
        // Now do the acquisition
        i = 0;
@@ -1983,7 +1993,7 @@ void SendForward(uint8_t fwd_bit_count) {
   //Field on
   FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
   FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
   
   // Give it a bit of time for the resonant antenna to settle.
   // And for the tag to fully power up
@@ -1995,7 +2005,7 @@ void SendForward(uint8_t fwd_bit_count) {
   FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
   SpinDelayUs(55*8); //55 cycles off (8us each)for 4305
   FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);//field on
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
   SpinDelayUs(16*8); //16 cycles on (8us each)
   
   // now start writting
@@ -2007,7 +2017,7 @@ void SendForward(uint8_t fwd_bit_count) {
       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
       SpinDelayUs(23*8); //16-4 cycles off (8us each)
       FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
-      FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);//field on
+      FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
       SpinDelayUs(9*8); //16 cycles on (8us each)
     }
   }