fix 'hf iclass sim':

* add simulation of block 3 and 4 reads
* add simulation of READ4 (4 blocks read)
* fixing TransmitTo15693Reader()  (again)
* FPGA change (hi_simulate.v): avoid spp_clk phase changes
* some whitespace fixes

armsrc/iclass.c

@@ -860,6 +860,12 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 	uint8_t *resp_cc = BigBuf_malloc(18);
 	int resp_cc_len;
 
+	// Kd, Kc (blocks 3 and 4). Cannot be read. Always respond with 0xff bytes only
+	uint8_t *resp_ff = BigBuf_malloc(22);
+	int resp_ff_len;
+	uint8_t ff_data[10] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00};
+	AppendCrc(ff_data, 8);
+
 	// Application Issuer Area (block 5)
 	uint8_t *resp_aia = BigBuf_malloc(22);
 	int resp_aia_len;
@@ -897,14 +903,19 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 	memcpy(resp_cc, ToSend, ToSendMax);
 	resp_cc_len = ToSendMax;
 
+	// Kd, Kc (blocks 3 and 4)
+	CodeIso15693AsTag(ff_data, sizeof(ff_data));
+	memcpy(resp_ff, ToSend, ToSendMax);
+	resp_ff_len = ToSendMax;
+
 	// Application Issuer Area (block 5)
 	CodeIso15693AsTag(aia_data, sizeof(aia_data));
 	memcpy(resp_aia, ToSend, ToSendMax);
 	resp_aia_len = ToSendMax;
 
 	//This is used for responding to READ-block commands or other data which is dynamically generated
-	uint8_t *data_generic_trace = BigBuf_malloc(8 + 2); // 8 bytes data + 2byte CRC is max tag answer
+	uint8_t *data_generic_trace = BigBuf_malloc(32 + 2); // 32 bytes data + 2byte CRC is max tag answer
-	uint8_t *data_response = BigBuf_malloc( (8 + 2) * 2 + 2);
+	uint8_t *data_response = BigBuf_malloc( (32 + 2) * 2 + 2);
 
 	LED_A_ON();
 	bool buttonPressed = false;
@@ -931,6 +942,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 		modulated_response_size = 0;
 		trace_data = NULL;
 		trace_data_size = 0;
+
 		if (receivedCmd[0] == ICLASS_CMD_ACTALL) {
 			// Reader in anticollission phase
 			modulated_response = resp_sof;
@@ -944,12 +956,11 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 			modulated_response_size = resp_anticoll_len;
 			trace_data = anticoll_data;
 			trace_data_size = sizeof(anticoll_data);
-			//DbpString("Reader requests anticollission CSN:");
 
 		} else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4) { // read block
 			uint16_t blockNo = receivedCmd[1];
-			if (simulationMode != ICLASS_SIM_MODE_FULL) {
+			if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
-				// provide defaults for blocks 0, 1, 2, 5
+				// provide defaults for blocks 0 ... 5
 				switch (blockNo) {
 					case 0: // csn (block 00)
 						modulated_response = resp_csn;
@@ -973,6 +984,13 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 							memcpy(reader_mac_buf, card_challenge_data, 8);
 						}
 						break;
+					case 3:
+					case 4: // Kd, Kd, always respond with 0xff bytes
+						modulated_response = resp_ff;
+						modulated_response_size = resp_ff_len;
+						trace_data = ff_data;
+						trace_data_size = sizeof(ff_data);
+						break;
 					case 5: // Application Issuer Area (block 05)
 						modulated_response = resp_aia;
 						modulated_response_size = resp_aia_len;
@@ -981,6 +999,12 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 						break;
 					// default: don't respond
 				}
+			} else if (simulationMode == ICLASS_SIM_MODE_FULL) {
+				if (blockNo == 3 || blockNo == 4) { // Kd, Kc, always respond with 0xff bytes
+					modulated_response = resp_ff;
+					modulated_response_size = resp_ff_len;
+					trace_data = ff_data;
+					trace_data_size = sizeof(ff_data);
 				} else { // use data from emulator memory
 					memcpy(data_generic_trace, emulator + (receivedCmd[1] << 3), 8);
 					AppendCrc(data_generic_trace, 8);
@@ -991,6 +1015,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 					modulated_response = data_response;
 					modulated_response_size = ToSendMax;
 				}
+			}
 
 		} else if (receivedCmd[0] == ICLASS_CMD_SELECT) {
 			// Reader selects anticollission CSN.
@@ -1039,6 +1064,18 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 			trace_data = NULL;
 			trace_data_size = 0;
 
+		} else if (simulationMode == ICLASS_SIM_MODE_FULL && receivedCmd[0] == ICLASS_CMD_READ4 && len == 4) {  // 0x06
+			//Read block
+			//Take the data...
+			memcpy(data_generic_trace, emulator + (receivedCmd[1] << 3), 8 * 4);
+			AppendCrc(data_generic_trace, 8 * 4);
+			trace_data = data_generic_trace;
+			trace_data_size = 8 * 4 + 2;
+			CodeIso15693AsTag(trace_data, trace_data_size);
+			memcpy(data_response, ToSend, ToSendMax);
+			modulated_response = data_response;
+			modulated_response_size = ToSendMax;
+
 		} else if (receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == ICLASS_SIM_MODE_FULL) {
 			// Probably the reader wants to update the nonce. Let's just ignore that for now.
 			// OBS! If this is implemented, don't forget to regenerate the cipher_state
@@ -1072,7 +1109,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 		}
 
 		/**
-		A legit tag has about 330us delay between reader EOT and tag SOF.
+		A legit tag has about 311,5us delay between reader EOT and tag SOF.
 		**/
 		if (modulated_response_size > 0) {
 			uint32_t response_time = reader_eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM - DELAY_ARM_TO_READER_SIM;

armsrc/iso15693.c

@@ -342,10 +342,10 @@ void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time,
 		for (int i = 7; i >= 0; i--) {
 			uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00;
 			for (int j = 0; j < (slow?4:1); ) {
-				bits_to_send = bits_to_shift << (8 - shift_delay) | cmd_bits >> shift_delay;
-				bits_to_shift = cmd_bits;
 				if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+					bits_to_send = bits_to_shift << (8 - shift_delay) | cmd_bits >> shift_delay;
 					AT91C_BASE_SSC->SSC_THR = bits_to_send;
+					bits_to_shift = cmd_bits;
 					j++;
 				}
 			}

armsrc/iso15693.h

@@ -18,7 +18,7 @@
 // Delays in SSP_CLK ticks.
 // SSP_CLK runs at 13,56MHz / 32 = 423.75kHz when simulating a tag
 #define DELAY_READER_TO_ARM_SIM           8
-#define DELAY_ARM_TO_READER_SIM           1
+#define DELAY_ARM_TO_READER_SIM           0
 #define DELAY_ISO15693_VCD_TO_VICC_SIM    132  // 132/423.75kHz = 311.5us from end of command EOF to start of tag response
 //SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader
 #define DELAY_ISO15693_VCD_TO_VICC_READER 1056 // 1056/3,39MHz = 311.5us from end of command EOF to start of tag response

fpga/hi_simulate.v

@@ -47,9 +47,9 @@ end
 
 // Divide 13.56 MHz to produce various frequencies for SSP_CLK
 // and modulation.
-reg [7:0] ssp_clk_divider;
+reg [8:0] ssp_clk_divider;
 
-always @(posedge adc_clk)
+always @(negedge adc_clk)
     ssp_clk_divider <= (ssp_clk_divider + 1);
 
 reg ssp_clk;
@@ -58,35 +58,37 @@ always @(negedge adc_clk)
 begin
     if (mod_type == `FPGA_HF_SIMULATOR_MODULATE_424K_8BIT)
       // Get bit every at 53KHz (every 8th carrier bit of 424kHz)
-      ssp_clk <= ssp_clk_divider[7];
+      ssp_clk <= ~ssp_clk_divider[7];
     else if (mod_type == `FPGA_HF_SIMULATOR_MODULATE_212K)
       // Get next bit at 212kHz
-      ssp_clk <= ssp_clk_divider[5];
+      ssp_clk <= ~ssp_clk_divider[5];
     else
       // Get next bit at 424Khz
-      ssp_clk <= ssp_clk_divider[4];
+      ssp_clk <= ~ssp_clk_divider[4];
 end
 
 
-// Divide SSP_CLK by 8 to produce the byte framing signal; the phase of
+// Produce the byte framing signal; the phase of this signal 
-// this is arbitrary, because it's just a bitstream.
+// is arbitrary, because it's just a bit stream in this module.
-// One nasty issue, though: I can't make it work with both rx and tx at
-// once. The phase wrt ssp_clk must be changed. TODO to find out why
-// that is and make a better fix.
-reg [2:0] ssp_frame_divider_to_arm;
-always @(posedge ssp_clk)
-    ssp_frame_divider_to_arm <= (ssp_frame_divider_to_arm + 1);
-reg [2:0] ssp_frame_divider_from_arm;
-always @(negedge ssp_clk)
-    ssp_frame_divider_from_arm <= (ssp_frame_divider_from_arm + 1);
-
-
 reg ssp_frame;
-always @(ssp_frame_divider_to_arm or ssp_frame_divider_from_arm or mod_type)
+always @(negedge adc_clk)
-    if(mod_type == `FPGA_HF_SIMULATOR_NO_MODULATION) // not modulating, so listening, to ARM
+begin
-        ssp_frame = (ssp_frame_divider_to_arm == 3'b000);
+	if (mod_type == `FPGA_HF_SIMULATOR_MODULATE_212K)
+	begin
+		if (ssp_clk_divider[8:5] == 4'd1)
+			ssp_frame <= 1'b1;
+		if (ssp_clk_divider[8:5] == 4'd5)
+			ssp_frame <= 1'b0;
+	end
 	else
-        ssp_frame = (ssp_frame_divider_from_arm == 3'b000);
+	begin
+		if (ssp_clk_divider[7:4] == 4'd1)
+			ssp_frame <= 1'b1;
+		if (ssp_clk_divider[7:4] == 4'd5)
+			ssp_frame <= 1'b0;
+	end
+end
+
 
 // Synchronize up the after-hysteresis signal, to produce DIN.
 reg ssp_din;
@@ -120,6 +122,6 @@ assign pwr_lo = 1'b0;
 assign pwr_oe2 = 1'b0;
 
 
-assign dbg = ssp_din;
+assign dbg = ssp_frame;
 
 endmodule