#include "apps.h"
#include "util.h"
#include "string.h"
-
#include "lfsampling.h"
+#include "usb_cdc.h" // for usb_poll_validate_length
+#include "fpgaloader.h"
-sample_config config = { 1, 8, 1, 88, 0 } ;
+sample_config config = { 1, 8, 1, 95, 0, 0 } ;
void printConfig()
{
- Dbprintf("Sampling config: ");
+ Dbprintf("LF Sampling config: ");
Dbprintf(" [q] divisor: %d ", config.divisor);
Dbprintf(" [b] bps: %d ", config.bits_per_sample);
Dbprintf(" [d] decimation: %d ", config.decimation);
Dbprintf(" [a] averaging: %d ", config.averaging);
Dbprintf(" [t] trigger threshold: %d ", config.trigger_threshold);
+ Dbprintf(" [s] samples to skip: %d ", config.samples_to_skip);
}
* Other functions may read samples and ignore the sampling config,
* such as functions to read the UID from a prox tag or similar.
*
- * Values set to '0' implies no change (except for averaging)
+ * Values set to '0' implies no change (except for averaging, threshold, samples_to_skip)
* @brief setSamplingConfig
* @param sc
*/
if(sc->bits_per_sample!= 0) config.bits_per_sample= sc->bits_per_sample;
if(sc->decimation!= 0) config.decimation= sc->decimation;
if(sc->trigger_threshold != -1) config.trigger_threshold= sc->trigger_threshold;
+ if(sc->samples_to_skip != -1) config.samples_to_skip = sc->samples_to_skip;
config.averaging= sc->averaging;
if(config.bits_per_sample > 8) config.bits_per_sample = 8;
uint32_t position;
} BitstreamOut;
-
/**
* @brief Pushes bit onto the stream
* @param stream
// Give it a bit of time for the resonant antenna to settle.
SpinDelay(50);
// Now set up the SSC to get the ADC samples that are now streaming at us.
- FpgaSetupSsc();
+ FpgaSetupSsc(FPGA_MAJOR_MODE_LF_ADC);
}
-
/**
* Does the sample acquisition. If threshold is specified, the actual sampling
* is not commenced until the threshold has been reached.
* @param silent - is true, now outputs are made. If false, dbprints the status
* @return the number of bits occupied by the samples.
*/
-
-uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold,bool silent)
+uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold, bool silent, int bufsize, int cancel_after, int samples_to_skip)
{
//.
uint8_t *dest = BigBuf_get_addr();
- int bufsize = BigBuf_max_traceLen();
+ bufsize = (bufsize > 0 && bufsize < BigBuf_max_traceLen()) ? bufsize : BigBuf_max_traceLen();
- memset(dest, 0, bufsize);
+ //memset(dest, 0, bufsize); //creates issues with cmdread (marshmellow)
if(bits_per_sample < 1) bits_per_sample = 1;
if(bits_per_sample > 8) bits_per_sample = 8;
uint32_t sample_sum =0 ;
uint32_t sample_total_numbers =0 ;
uint32_t sample_total_saved =0 ;
+ uint32_t cancel_counter = 0;
+ uint32_t samples_skipped = 0;
- while(!BUTTON_PRESS()) {
+ while(!BUTTON_PRESS() && !usb_poll_validate_length() ) {
WDT_HIT();
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
AT91C_BASE_SSC->SSC_THR = 0x43;
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
LED_D_OFF();
- if (trigger_threshold > 0 && sample < trigger_threshold)
+ // threshold either high or low values 128 = center 0. if trigger = 178
+ if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) { //
+ if (cancel_after > 0) {
+ cancel_counter++;
+ if (cancel_after == cancel_counter) break;
+ }
continue;
-
+ }
trigger_threshold = 0;
+ if (samples_to_skip > samples_skipped) {
+ samples_skipped++;
+ continue;
+ }
sample_total_numbers++;
if(averaging)
*/
uint32_t DoAcquisition_default(int trigger_threshold, bool silent)
{
- return DoAcquisition(1,8,0,trigger_threshold,silent);
+ return DoAcquisition(1,8,0,trigger_threshold,silent,0,0,0);
}
-uint32_t DoAcquisition_config( bool silent)
+uint32_t DoAcquisition_config(bool silent, int sample_size)
{
return DoAcquisition(config.decimation
,config.bits_per_sample
,config.averaging
,config.trigger_threshold
- ,silent);
+ ,silent
+ ,sample_size
+ ,0
+ ,config.samples_to_skip);
}
-uint32_t ReadLF(bool activeField)
+uint32_t DoPartialAcquisition(int trigger_threshold, bool silent, int sample_size, int cancel_after) {
+ return DoAcquisition(1,8,0,trigger_threshold,silent,sample_size,cancel_after,0);
+}
+
+uint32_t ReadLF(bool activeField, bool silent, int sample_size)
{
- printConfig();
+ if (!silent) printConfig();
LFSetupFPGAForADC(config.divisor, activeField);
// Now call the acquisition routine
- return DoAcquisition_config(false);
+ return DoAcquisition_config(silent, sample_size);
}
/**
* Initializes the FPGA for reader-mode (field on), and acquires the samples.
* @return number of bits sampled
**/
-uint32_t SampleLF()
+uint32_t SampleLF(bool printCfg, int sample_size)
{
- return ReadLF(true);
+ uint32_t ret = ReadLF(true, printCfg, sample_size);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ return ret;
}
/**
* Initializes the FPGA for snoop-mode (field off), and acquires the samples.
uint32_t SnoopLF()
{
- return ReadLF(false);
+ uint32_t ret = ReadLF(false, true, 0);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ return ret;
+}
+
+/**
+* acquisition of Cotag LF signal. Similar to other LF, since the Cotag has such long datarate RF/384
+* and is Manchester?, we directly gather the manchester data into bigbuff
+**/
+#define COTAG_T1 384
+#define COTAG_T2 (COTAG_T1>>1)
+#define COTAG_ONE_THRESHOLD 128+30
+#define COTAG_ZERO_THRESHOLD 128-30
+#ifndef COTAG_BITS
+#define COTAG_BITS 264
+#endif
+void doCotagAcquisition(size_t sample_size) {
+
+ uint8_t *dest = BigBuf_get_addr();
+ uint16_t bufsize = BigBuf_max_traceLen();
+
+ if ( bufsize > sample_size )
+ bufsize = sample_size;
+
+ dest[0] = 0;
+ uint8_t sample = 0, firsthigh = 0, firstlow = 0;
+ uint16_t i = 0;
+
+ while (!BUTTON_PRESS() && !usb_poll_validate_length() && (i < bufsize) ) {
+ WDT_HIT();
+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+ AT91C_BASE_SSC->SSC_THR = 0x43;
+ LED_D_ON();
+ }
+
+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
+ sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ LED_D_OFF();
+
+ // find first peak
+ if ( !firsthigh ) {
+ if (sample < COTAG_ONE_THRESHOLD)
+ continue;
+ firsthigh = 1;
+ }
+ if ( !firstlow ){
+ if (sample > COTAG_ZERO_THRESHOLD )
+ continue;
+ firstlow = 1;
+ }
+
+ ++i;
+
+ if ( sample > COTAG_ONE_THRESHOLD)
+ dest[i] = 255;
+ else if ( sample < COTAG_ZERO_THRESHOLD)
+ dest[i] = 0;
+ else
+ dest[i] = dest[i-1];
+ }
+ }
+}
+
+uint32_t doCotagAcquisitionManchester() {
+
+ uint8_t *dest = BigBuf_get_addr();
+ uint16_t bufsize = BigBuf_max_traceLen();
+
+ if ( bufsize > COTAG_BITS )
+ bufsize = COTAG_BITS;
+
+ dest[0] = 0;
+ uint8_t sample = 0, firsthigh = 0, firstlow = 0;
+ uint16_t sample_counter = 0, period = 0;
+ uint8_t curr = 0, prev = 0;
+ uint16_t noise_counter = 0;
+ while (!BUTTON_PRESS() && !usb_poll_validate_length() && (sample_counter < bufsize) && (noise_counter < (COTAG_T1<<1)) ) {
+ WDT_HIT();
+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+ AT91C_BASE_SSC->SSC_THR = 0x43;
+ LED_D_ON();
+ }
+
+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
+ sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ LED_D_OFF();
+
+ // find first peak
+ if ( !firsthigh ) {
+ if (sample < COTAG_ONE_THRESHOLD) {
+ noise_counter++;
+ continue;
+ }
+ noise_counter = 0;
+ firsthigh = 1;
+ }
+
+ if ( !firstlow ){
+ if (sample > COTAG_ZERO_THRESHOLD ) {
+ noise_counter++;
+ continue;
+ }
+ noise_counter=0;
+ firstlow = 1;
+ }
+
+ // set sample 255, 0, or previous
+ if ( sample > COTAG_ONE_THRESHOLD){
+ prev = curr;
+ curr = 1;
+ }
+ else if ( sample < COTAG_ZERO_THRESHOLD) {
+ prev = curr;
+ curr = 0;
+ }
+ else {
+ curr = prev;
+ }
+
+ // full T1 periods,
+ if ( period > 0 ) {
+ --period;
+ continue;
+ }
+
+ dest[sample_counter] = curr;
+ ++sample_counter;
+ period = COTAG_T1;
+ }
+ }
+ return sample_counter;
}
projects / proxmark3-svn / blobdiff