RfidResearchGroup/proxmark3
1
1
Fork 0
mirror of https://github.com/RfidResearchGroup/proxmark3.git synced 2025-01-08 01:06:37 +08:00
Code Issues Projects Releases Packages Wiki Activity

lfsampling adaptations

Browse source
This commit is contained in:
iceman1001 2020-09-06 18:32:23 +02:00
parent 3d18f44d35
commit 47f1bd2d6c
1 changed files with 24 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
armsrc/lfsampling.c
View file

@ -268,10 +268,10 @@ uint32_t DoAcquisition(uint8_t decimation, uint8_t bits_per_sample, bool avg, in
initSampleBuffer(&sample_size);
if (DBGLEVEL >= DBG_DEBUG) {
Dbprintf("lf sampling - after init");
printSamples();
}
bool trigger_hit = false;
uint32_t cancel_counter = 0;
int16_t checked = 0;
@ -279,7 +279,7 @@ uint32_t DoAcquisition(uint8_t decimation, uint8_t bits_per_sample, bool avg, in
// only every 4000th times, in order to save time when collecting samples.
// interruptible only when logging not yet triggered
if ((checked >= 4000) && (trigger_threshold > 0)) {
if ((checked >= 4000) && trigger_hit == false) {
if (data_available()) {
checked = -1;
break;
@ -298,10 +298,11 @@ uint32_t DoAcquisition(uint8_t decimation, uint8_t bits_per_sample, bool avg, in
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
volatile uint8_t sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
// Testpoint 8 (TP8) can be used to trigger oscilliscope
// Test point 8 (TP8) can be used to trigger oscilloscope
LED_D_OFF();
// threshold either high or low values 128 = center 0. if trigger = 178
if (trigger_hit == false) {
if ((trigger_threshold > 0) && (sample < (trigger_threshold + 128)) && (sample > (128 - trigger_threshold))) {
if (cancel_after > 0) {
cancel_counter++;
@ -310,8 +311,9 @@ uint32_t DoAcquisition(uint8_t decimation, uint8_t bits_per_sample, bool avg, in
}
continue;
}
}
trigger_threshold = 0;
trigger_hit = true;
if (samples_to_skip > 0) {
samples_to_skip--;
@ -324,18 +326,19 @@ uint32_t DoAcquisition(uint8_t decimation, uint8_t bits_per_sample, bool avg, in
}
}
if (checked == -1 && verbose) {
Dbprintf("lf sampling aborted");
}
if (verbose) {
if (checked == -1) {
Dbprintf("lf sampling aborted");
} else if (cancel_counter == cancel_after) {
Dbprintf("lf sampling cancelled after %u", cancel_counter);
}
Dbprintf("Done, saved " _YELLOW_("%d")" out of " _YELLOW_("%d")" seen samples at " _YELLOW_("%d")" bits/sample", samples.total_saved, samples.counter, bits_per_sample);
}
// Ensure that DC offset removal and noise check is performed for any device-side processing
removeSignalOffset(data.buffer, samples.total_saved);
computeSignalProperties(data.buffer, samples.total_saved);
return data.numbits;
}
/**
@ -356,12 +359,19 @@ uint32_t DoAcquisition_config(bool verbose, uint32_t sample_size) {
, config.trigger_threshold
, verbose
, sample_size
, 0
, 0 // cancel_after
, config.samples_to_skip);
}
uint32_t DoPartialAcquisition(int trigger_threshold, bool verbose, uint32_t sample_size, uint32_t cancel_after) {
return DoAcquisition(1, 8, 0, trigger_threshold, verbose, sample_size, cancel_after, 0);
return DoAcquisition(config.decimation
, config.bits_per_sample
, config.averaging
, trigger_threshold
, verbose
, sample_size
, cancel_after
, 0); // samples to skip
}
static uint32_t ReadLF(bool reader_field, bool verbose, uint32_t sample_size) {
@ -370,6 +380,7 @@ static uint32_t ReadLF(bool reader_field, bool verbose, uint32_t sample_size) {
LFSetupFPGAForADC(config.divisor, reader_field);
uint32_t ret = DoAcquisition_config(verbose, sample_size);
StopTicks();
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
return ret;
}
@ -495,7 +506,7 @@ void doCotagAcquisition(void) {
bool firsthigh = false, firstlow = false;
uint16_t i = 0, noise_counter = 0;
while ((i < bufsize) && (noise_counter < COTAG_T1 << 1)) {
while ((i < bufsize - 1) && (noise_counter < COTAG_T1 << 1)) {
if (BUTTON_PRESS())
break;
@ -527,14 +538,13 @@ void doCotagAcquisition(void) {
firstlow = true;
}
if (++i < bufsize) {
++i;
if (sample > COTAG_ONE_THRESHOLD) {
dest[i] = 255;
} else if (sample < COTAG_ZERO_THRESHOLD) {
dest[i] = 0;
} else {
dest[i] = dest[i - 1];
}
}
}
}