From 2248eadc7f1f883a7c6cdb055a257f5a76d1288f Mon Sep 17 00:00:00 2001
From: merlokk <807634+merlokk@users.noreply.github.com>
Date: Mon, 27 Jun 2022 00:31:15 +0300
Subject: [PATCH] locate start of the sequence and level

---
 client/src/cmdhftexkom.c | 71 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 68 insertions(+), 3 deletions(-)

diff --git a/client/src/cmdhftexkom.c b/client/src/cmdhftexkom.c
index e03dfb910..a2d8e39a8 100644
--- a/client/src/cmdhftexkom.c
+++ b/client/src/cmdhftexkom.c
@@ -27,6 +27,48 @@
 #include "ui.h"
 #include "cmdhf14a.h" 
 #include "cmddata.h" 
+#include "graph.h" 
+
+#define TEXKOM_NOISE_THRESHOLD (10)
+
+inline uint32_t GetGraphBuffer(uint32_t indx) {
+    if (g_GraphBuffer[indx] < -128)
+        return 0;
+    else
+        return g_GraphBuffer[indx] + 128;
+}
+
+static uint32_t TexkomSearchStart(uint32_t indx, uint8_t threshold) {
+    // one bit length = 27, minimal noise = 60
+    uint32_t lownoisectr = 0;
+    for (uint32_t i = indx; i < g_GraphTraceLen; i++) {
+        if (lownoisectr > 60) {
+            if (GetGraphBuffer(i) > threshold)
+                return i;
+        } else {
+            if (GetGraphBuffer(i) > threshold)
+                lownoisectr = 0;
+            else
+                lownoisectr++;
+        }
+    }
+
+    return 0;
+}
+
+static uint32_t TexkomSearchMax(uint32_t indx, uint32_t len) {
+    uint32_t res = 0;
+
+    for (uint32_t i = 0; i < len; i++) {
+        if (i + indx > g_GraphTraceLen)
+            break;
+
+        if (GetGraphBuffer(indx + i) > res)
+            res = GetGraphBuffer(indx + i);
+    }
+
+    return res;
+}
 
 static int CmdHFTexkomReader(const char *Cmd) {
     CLIParserContext *ctx;
@@ -41,7 +83,7 @@ static int CmdHFTexkomReader(const char *Cmd) {
     CLIExecWithReturn(ctx, Cmd, argtable, true);
     CLIParserFree(ctx);
 
-    uint32_t samplesCount = 40000;
+    uint32_t samplesCount = 12000;
     clearCommandBuffer();
     SendCommandNG(CMD_HF_ACQ_RAW_ADC, (uint8_t *)&samplesCount, sizeof(uint32_t));
 
@@ -52,8 +94,31 @@ static int CmdHFTexkomReader(const char *Cmd) {
     }
 
     uint32_t size = (resp.data.asDwords[0]);
-    if (size > 0)
-        getSamples(samplesCount, true);
+    if (size > 0) {
+        if (getSamples(samplesCount, true) != PM3_SUCCESS) {
+            PrintAndLogEx(ERR, "Get samples error");
+            return PM3_EFAILED;
+        };
+    }
+
+    uint32_t sindx = 0;
+    while (sindx < samplesCount - 5) {
+        sindx = TexkomSearchStart(sindx, TEXKOM_NOISE_THRESHOLD);
+        if (sindx == 0 || sindx > samplesCount - 5)
+            break;
+
+        uint32_t maxlvl = TexkomSearchMax(sindx, 1760);
+        if (maxlvl < TEXKOM_NOISE_THRESHOLD) {
+            sindx += 1700;
+            continue;
+        }
+        PrintAndLogEx(WARNING, "--- indx: %d, max: %d", sindx, maxlvl);
+      
+
+
+    }
+
+    PrintAndLogEx(WARNING, "Texkom card is not found");
 
     return PM3_SUCCESS;
 }