fix hf 15 commands (#293)

armsrc/fpgaloader.h

@@ -58,7 +58,6 @@ void SetAdcMuxFor(uint32_t whichGpio);
 // Options for the HF reader, correlating against rx from tag
 #define FPGA_HF_READER_RX_XCORR_848_KHZ				(1<<0)
 #define FPGA_HF_READER_RX_XCORR_SNOOP				(1<<1)
-#define FPGA_HF_READER_RX_XCORR_QUARTER_FREQ		(1<<2)
 // Options for the HF simulated tag, how to modulate
 #define FPGA_HF_SIMULATOR_NO_MODULATION				(0<<0)
 #define FPGA_HF_SIMULATOR_MODULATE_BPSK				(1<<0)

armsrc/iso15693.c

@@ -319,7 +319,7 @@ static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *
 			// every other is Q. We just want power, so abs(I) + abs(Q) is
 			// close to what we want.
 			if(getNext) {
-				int8_t r = ABS(b) + ABS(prev);
+				uint8_t r = ABS(b) + ABS(prev);
 
 				dest[c++] = (uint8_t)r;
 
@@ -356,7 +356,7 @@ static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *
 			maxPos = i;
 		}
 	}
-	//	DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
+		// Dbprintf("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
 
 	int k = 0; // this will be our return value
 
@@ -385,7 +385,7 @@ static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *
 			corr1 *= 4;
 	
 			if(corrEOF > corr1 && corrEOF > corr0) {
-	//			DbpString("EOF at %d", i);
+				// Dbprintf("EOF at %d", i);
 				break;
 			} else if(corr1 > corr0) {
 				i += arraylen(Logic1)/skip;
@@ -457,7 +457,7 @@ static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int
 			// every other is Q. We just want power, so abs(I) + abs(Q) is
 			// close to what we want.
 			if(getNext) {
-				int8_t r = ABS(b) + ABS(prev);
+				uint8_t r = ABS(b) + ABS(prev);
 
 				dest[c++] = (uint8_t)r;
 
@@ -626,7 +626,7 @@ void AcquireRawAdcSamplesIso15693(void)
 			// every other is Q. We just want power, so abs(I) + abs(Q) is
 			// close to what we want.
 			if(getNext) {
-				int8_t r = ABS(b) + ABS(prev);
+				uint8_t r = ABS(b) + ABS(prev);
 
 				dest[c++] = (uint8_t)r;
 
@@ -680,7 +680,7 @@ void RecordRawAdcSamplesIso15693(void)
 			// every other is Q. We just want power, so abs(I) + abs(Q) is
 			// close to what we want.
 			if(getNext) {
-				int8_t r = ABS(b) + ABS(prev);
+				uint8_t r = ABS(b) + ABS(prev);
 
 				dest[c++] = (uint8_t)r;
 

fpga/hi_read_rx_xcorr.v

@@ -28,11 +28,18 @@ assign pwr_oe1 = 1'b0;
 assign pwr_oe3 = 1'b0;
 assign pwr_oe4 = 1'b0;
 
-wire adc_clk = ck_1356megb;
+// Clock divider
-
+reg [0:0] fc_divider;
-reg fc_div_2;
 always @(negedge ck_1356megb)
-    fc_div_2 <= fc_div_2 + 1;
+    fc_divider <= fc_divider + 1;
+wire fc_div2 = fc_divider[0];
+
+reg adc_clk;
+always @(ck_1356megb)
+	if (xcorr_is_848)
+		adc_clk <= ck_1356megb;
+	else
+		adc_clk <= fc_div2;
 
 // When we're a reader, we just need to do the BPSK demod; but when we're an
 // eavesdropper, we also need to pick out the commands sent by the reader,
@@ -77,7 +84,6 @@ reg ssp_frame;
 
 always @(negedge adc_clk)
 begin
-	if (xcorr_is_848 | fc_div_2)
 		corr_i_cnt <= corr_i_cnt + 1;
 end		
 		
@@ -137,7 +143,7 @@ begin
     begin
         ssp_clk <= 1'b1;
         // Don't shift if we just loaded new data, obviously.
-        if(corr_i_cnt != 7'd0)
+        if(corr_i_cnt != 6'd0)
         begin
             corr_i_out[7:0] <= {corr_i_out[6:0], corr_q_out[7]};
             corr_q_out[7:1] <= corr_q_out[6:0];