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check noise at the antenna

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merlokk 2022-06-28 19:06:17 +03:00
commit 22f1e8e209
1 changed files with 15 additions and 1 deletions
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16
client/src/cmdhftexkom.c
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@ -38,6 +38,17 @@ inline uint32_t GetGraphBuffer(uint32_t indx) {
return g_GraphBuffer[indx] + 128; return g_GraphBuffer[indx] + 128;
} }
static uint32_t TexkomAVGField(void) {
if (g_GraphTraceLen == 0)
return 0;
uint64_t vsum = 0;
for (uint32_t i = 0; i < g_GraphTraceLen; i++)
vsum += GetGraphBuffer(i);
return vsum / g_GraphTraceLen;
}
static uint32_t TexkomSearchStart(uint32_t indx, uint32_t threshold) { static uint32_t TexkomSearchStart(uint32_t indx, uint32_t threshold) {
// one bit length = 27, minimal noise = 60 // one bit length = 27, minimal noise = 60
uint32_t lownoisectr = 0; uint32_t lownoisectr = 0;
@ -398,8 +409,11 @@ static int CmdHFTexkomReader(const char *Cmd) {
uint32_t sindx = 0; uint32_t sindx = 0;
while (sindx < samplesCount - 5) { while (sindx < samplesCount - 5) {
sindx = TexkomSearchStart(sindx, TEXKOM_NOISE_THRESHOLD); sindx = TexkomSearchStart(sindx, TEXKOM_NOISE_THRESHOLD);
if (sindx == 0 || sindx > samplesCount - 5) if (sindx == 0 || sindx > samplesCount - 5) {
if (TexkomAVGField() > 30)
PrintAndLogEx(WARNING, "Too noisy environment. Try to move the tag from the antenna a bit.");
break; break;
}
uint32_t slen = TexkomSearchLength(sindx, TEXKOM_NOISE_THRESHOLD); uint32_t slen = TexkomSearchLength(sindx, TEXKOM_NOISE_THRESHOLD);
if (slen == 0) if (slen == 0)