ADD: 'lf cotag read' - COTAG can be read now.

[proxmark3-svn] / armsrc / lfops.c

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index 1c11ad09cd0b08a0ed31d7403e6e72129723cf57..3c69770e3bd69dcf39e2550bf98d3f381865274c 100644 (file)
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -799,7 +799,7 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
                WDT_HIT();
                if (ledcontrol) LED_A_ON();
 
-               DoAcquisition_default(-1,true);
+               DoAcquisition_default(0, true);
                // FSK demodulator
                size = 50*128*2; //big enough to catch 2 sequences of largest format
                idx = HIDdemodFSK(dest, &size, &hi2, &hi, &lo);
@@ -1740,18 +1740,36 @@ void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode
        LED_D_OFF();
 }
 
-void Cotag() {
+/*
+Reading a COTAG.
+
+COTAG needs the reader to send a startsequence and the card has an extreme slow datarate.
+because of this, we can "sample" the data signal but we interpreate it to Manchester direct.
+
+READER START SEQUENCE:
+burst 800 us,    gap   2.2 msecs
+burst 3.6 msecs  gap   2.2 msecs
+burst 800 us     gap   2.2 msecs
+pulse 3.6 msecs
+
+This triggers a COTAG tag to response
+*/
+void Cotag(uint32_t arg0) {
 
 #define OFF    { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); WaitUS(2035); }
-//#define WAIT2200     { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); WaitUS(2200); }
-#define ON(x)      { FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 89); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); WaitUS((x)); }
-       LED_A_ON();
+#define ON(x)   { FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); WaitUS((x)); }
+
+       uint8_t rawsignal = arg0 & 0xF;
+
+       LED_A_ON();     
+
+       // Switching to LF image on FPGA. This might empty BigBuff
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        
        //clear buffer now so it does not interfere with timing later
        BigBuf_Clear_ext(false);
-
-       // Set up FPGA, 132kHz to power up the tag
-       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+       
+       // Set up FPGA, 132kHz to power up the tag      
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 89);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 
@@ -1761,27 +1779,20 @@ void Cotag() {
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        FpgaSetupSsc();
 
-       // start a 1.5ticks is 1us
+       // start clock - 1.5ticks is 1us
        StartTicks();
        
-       //send start pulse
+       //send COTAG start pulse
        ON(740)  OFF
        ON(3330) OFF
        ON(740)  OFF
        ON(1000)
 
-/*
-       ON(800)  OFF
-       ON(3600) OFF
-       ON(800)  OFF
-       ON(1000)
-
-burst 800 us,    gap   2.2 msecs
-burst 3.6 msecs  gap   2.2 msecs
-burst 800 us     gap   2.2 msecs
-pulse 3.6 msecs
-*/
-       DoAcquisition_config(FALSE);    
+       switch(rawsignal) {
+               case 0: doCotagAcquisition(50000); break;
+               case 1: doCotagAcquisitionManchester(); break;
+               case 2: DoAcquisition_config(TRUE); break;
+       }
        
        // Turn the field off
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off