RfidResearchGroup/proxmark3
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locate start of the sequence and level

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This commit is contained in:
merlokk 2022-06-27 00:31:15 +03:00
parent 9813f85567
commit 2248eadc7f
1 changed files with 68 additions and 3 deletions
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71
client/src/cmdhftexkom.c
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@ -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;
}