X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/42c235e7efdac01da7e7ef3e4e442557fe50198d..d627a2fd8cf0d6c9dc670ed15fdfe1d87949d306:/armsrc/lfops.c

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index 71d9ba95..3c69770e 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -43,7 +43,7 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t periods, uint3
 	uint16_t period_0 =  periods >> 16;
 	uint16_t period_1 =  periods & 0xFFFF;
 	
-	// 95 == 125 KHz  88 == 124.8 KHz
+	// 95 == 125 KHz  88 == 134.8 KHz
 	int divisor_used = (useHighFreq) ? 88 : 95;
 	sample_config sc = { 0,0,1, divisor_used, 0};
 	setSamplingConfig(&sc);
@@ -78,6 +78,8 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t periods, uint3
 
 	// now do the read
 	DoAcquisition_config(false);
+	
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 }
 
 /* blank r/w tag data stream
@@ -797,7 +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);
@@ -1737,3 +1739,63 @@ void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
 	LED_D_OFF();
 }
+
+/*
+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 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	
+	FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 89);
+	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);
+	
+	// Now set up the SSC to get the ADC samples that are now streaming at us.
+	FpgaSetupSsc();
+
+	// start clock - 1.5ticks is 1us
+	StartTicks();
+	
+	//send COTAG start pulse
+	ON(740)  OFF
+	ON(3330) OFF
+	ON(740)  OFF
+	ON(1000)
+
+	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
+	cmd_send(CMD_ACK,0,0,0,0,0);    
+	LED_A_OFF();
+}