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add 'detectreader' command - listen for external reader fields

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This commit is contained in:
adam@algroup.co.uk 2009-07-07 17:19:42 +00:00
commit 7f3480429b
4 changed files with 106 additions and 0 deletions
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87
armsrc/appmain.c
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@ -7,6 +7,7 @@
#include <proxmark3.h>
#include <stdlib.h>
#include "apps.h"
#ifdef WITH_LCD
#include "fonts.h"
@ -727,6 +728,10 @@ void UsbPacketReceived(BYTE *packet, int len)
MeasureAntennaTuning();
break;
case CMD_LISTEN_READER_FIELD:
ListenReaderField(c->ext1);
break;
case CMD_HID_DEMOD_FSK:
CmdHIDdemodFSK(); // Demodulate HID tag
break;
@ -904,3 +909,85 @@ void SpinDelay(int ms)
WDT_HIT();
}
}
// listen for external reader
void ListenReaderField(int limit)
{
int lf_av, lf_av_new, lf_baseline= -1, lf_count= 0;
int hf_av, hf_av_new, hf_baseline= -1, hf_count= 0;
#define LF_ONLY 1
#define HF_ONLY 2
LED_A_OFF();
LED_B_OFF();
LED_C_OFF();
LED_D_OFF();
lf_av= ReadAdc(ADC_CHAN_LF);
if(limit != HF_ONLY && lf_baseline == -1)
{
DbpString("LF 125/134 Baseline:");
DbpIntegers(lf_av,0,0);
lf_baseline= lf_av;
}
hf_av= ReadAdc(ADC_CHAN_HF);
if (limit != LF_ONLY && hf_baseline == -1)
{
DbpString("HF 13.56 Baseline:");
DbpIntegers(hf_av,0,0);
hf_baseline= hf_av;
}
for(;;)
{
if(BUTTON_PRESS())
{
LED_B_OFF();
LED_D_OFF();
return;
}
WDT_HIT();
if (limit != HF_ONLY)
{
if (abs(lf_av - lf_baseline) > 10)
LED_D_ON();
else
LED_D_OFF();
++lf_count;
lf_av_new= ReadAdc(ADC_CHAN_LF);
// see if there's a significant change
if(abs(lf_av - lf_av_new) > 10)
{
DbpString("LF 125/134 Field Change:");
DbpIntegers(lf_av,lf_av_new,lf_count);
lf_av= lf_av_new;
lf_count= 0;
}
}
if (limit != LF_ONLY)
{
if (abs(hf_av - hf_baseline) > 10)
LED_B_ON();
else
LED_B_OFF();
++hf_count;
hf_av_new= ReadAdc(ADC_CHAN_HF);
// see if there's a significant change
if(abs(hf_av - hf_av_new) > 10)
{
DbpString("HF 13.56 Field Change:");
DbpIntegers(hf_av,hf_av_new,hf_count);
hf_av= hf_av_new;
hf_count= 0;
}
}
}
}