LF_EM4100EMULV1 - renamed to LF_EM4100EMUL. Make more easy control. Short click - switch slot and satrt simulation

LF_EM4100EMULV2 - deleted.
LF_EM4100EMULV3 - renamed to LF_EM4100RWC

armsrc/Standalone/lf_em4100emul.c

@@ -0,0 +1,98 @@
+//-----------------------------------------------------------------------------
+// Artyom Gnatyuk, 2020
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// LF emul  -   Very simple mode. Simulate only predefined in low[] IDs
+//              Short click - select next slot and start simulation
+//-----------------------------------------------------------------------------
+#include "standalone.h"
+#include "proxmark3_arm.h"
+#include "appmain.h"
+#include "fpgaloader.h"
+#include "lfops.h"
+#include "util.h"
+#include "dbprint.h"
+#include "ticks.h"
+#include "string.h"
+#include "BigBuf.h"
+
+#define MAX_IND 16 // 4 LEDs - 2^4 combinations
+#define CLOCK 64 //for 125kHz
+
+// low & high - array for storage IDs. Its length must be equal.
+// Predefined IDs must be stored in low[]. 
+// In high[] must be nulls
+uint64_t low[] = {0x565A1140BE,0x365A398149,0x5555555555,0xFFFFFFFFFF};
+uint32_t high[] = {0,0,0,0};
+uint8_t *bba,slots_count;
+int buflen;
+
+void ModInfo(void) {
+    DbpString("  LF EM4100 simulator standalone mode");
+}
+
+uint64_t ReversQuads(uint64_t bits){
+  uint64_t result = 0;
+  for (int i = 0; i < 16; i++){
+    result += ((bits >> (60 - 4 *i)) & 0xf) << (4 * i);
+      }
+  return result >> 24;
+}
+
+void FillBuff(uint8_t bit) {
+    memset (bba + buflen, bit, CLOCK / 2);
+	buflen += (CLOCK / 2);
+	memset (bba + buflen, bit^1,CLOCK / 2);
+	buflen += (CLOCK / 2);
+}
+
+void ConstructEM410xEmulBuf(uint64_t id) {
+	
+    int i, j, binary[4], parity[4];
+ 	buflen = 0;
+    for (i = 0; i < 9; i++)
+        FillBuff(1);
+    parity[0] = parity[1] = parity[2] = parity[3] = 0;
+    for (i = 0; i < 10; i++) {
+        for (j = 3; j >= 0; j--, id /= 2)
+            binary[j] = id % 2;
+        for (j = 0; j < 4; j++)
+			FillBuff(binary[j]);
+        FillBuff(binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
+        for (j = 0; j < 4; j++)
+			parity[j] ^= binary[j];
+    }
+	for (j = 0; j < 4; j++)
+    	FillBuff(parity[j]);
+    FillBuff(0);
+}
+
+void LED_Slot(int i) {
+	LEDsoff();
+	if (slots_count > 4) {
+		LED(i % MAX_IND, 0); //binary indication for slots_count > 4
+	} else {
+		LED(1 << i,0); //simple indication for slots_count <=4
+	}
+}
+
+void RunMod() {
+    StandAloneMode();
+    FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+	int selected = 0; //selected slot after start
+	slots_count = sizeof(low)/sizeof(low[0]);
+	bba = BigBuf_get_addr();
+	for (;;) {		
+		WDT_HIT();
+        if (data_available()) break;
+		SpinDelay(100);
+		SpinUp(100);
+		LED_Slot(selected);
+		ConstructEM410xEmulBuf(ReversQuads(low[selected]));
+		SimulateTagLowFrequency(buflen, 0, true);
+		selected = (selected + 1) % slots_count;
+	}
+}