mirror of
https://github.com/Proxmark/proxmark3.git
synced 2025-07-11 07:46:09 -07:00
simplify some code, add comments
ABS simplification from Iceman1001
This commit is contained in:
parent
29ada8fc08
commit
cf194819cc
6 changed files with 47 additions and 81 deletions
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@ -36,8 +36,6 @@
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#include "iso14443a.h"
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#include "iso14443a.h"
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#endif
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#endif
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#define abs(x) ( ((x)<0) ? -(x) : (x) )
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//=============================================================================
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//=============================================================================
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// A buffer where we can queue things up to be sent through the FPGA, for
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// A buffer where we can queue things up to be sent through the FPGA, for
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// any purpose (fake tag, as reader, whatever). We go MSB first, since that
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// any purpose (fake tag, as reader, whatever). We go MSB first, since that
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@ -841,7 +839,7 @@ void ListenReaderField(int limit)
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if (limit != HF_ONLY) {
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if (limit != HF_ONLY) {
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if(mode == 1) {
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if(mode == 1) {
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if (abs(lf_av - lf_baseline) > REPORT_CHANGE)
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if (ABS(lf_av - lf_baseline) > REPORT_CHANGE)
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LED_D_ON();
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LED_D_ON();
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else
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else
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LED_D_OFF();
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LED_D_OFF();
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@ -849,7 +847,7 @@ void ListenReaderField(int limit)
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lf_av_new = AvgAdc(ADC_CHAN_LF);
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lf_av_new = AvgAdc(ADC_CHAN_LF);
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// see if there's a significant change
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// see if there's a significant change
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if(abs(lf_av - lf_av_new) > REPORT_CHANGE) {
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if(ABS(lf_av - lf_av_new) > REPORT_CHANGE) {
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Dbprintf("LF 125/134kHz Field Change: %5dmV", (MAX_ADC_LF_VOLTAGE * lf_av_new) >> 10);
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Dbprintf("LF 125/134kHz Field Change: %5dmV", (MAX_ADC_LF_VOLTAGE * lf_av_new) >> 10);
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lf_av = lf_av_new;
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lf_av = lf_av_new;
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if (lf_av > lf_max)
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if (lf_av > lf_max)
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@ -859,7 +857,7 @@ void ListenReaderField(int limit)
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if (limit != LF_ONLY) {
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if (limit != LF_ONLY) {
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if (mode == 1){
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if (mode == 1){
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if (abs(hf_av - hf_baseline) > REPORT_CHANGE)
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if (ABS(hf_av - hf_baseline) > REPORT_CHANGE)
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LED_B_ON();
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LED_B_ON();
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else
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else
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LED_B_OFF();
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LED_B_OFF();
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@ -867,7 +865,7 @@ void ListenReaderField(int limit)
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hf_av_new = AvgAdc(ADC_CHAN_HF);
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hf_av_new = AvgAdc(ADC_CHAN_HF);
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// see if there's a significant change
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// see if there's a significant change
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if(abs(hf_av - hf_av_new) > REPORT_CHANGE) {
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if(ABS(hf_av - hf_av_new) > REPORT_CHANGE) {
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Dbprintf("HF 13.56MHz Field Change: %5dmV", (MAX_ADC_HF_VOLTAGE * hf_av_new) >> 10);
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Dbprintf("HF 13.56MHz Field Change: %5dmV", (MAX_ADC_HF_VOLTAGE * hf_av_new) >> 10);
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hf_av = hf_av_new;
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hf_av = hf_av_new;
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if (hf_av > hf_max)
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if (hf_av > hf_max)
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@ -547,15 +547,20 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
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}
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}
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*/
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*/
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// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
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// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
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//note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow
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#define CHECK_FOR_SUBCARRIER() { \
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#define CHECK_FOR_SUBCARRIER() { \
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v = MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2); \
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}
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/*
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if(ci < 0) { \
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if(ci < 0) { \
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if(cq < 0) { /* ci < 0, cq < 0 */ \
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if(cq < 0) { \ // ci < 0, cq < 0
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if (cq < ci) { \
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if (cq < ci) { \
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v = -cq - (ci >> 1); \
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v = -cq - (ci >> 1); \
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} else { \
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} else { \
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v = -ci - (cq >> 1); \
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v = -ci - (cq >> 1); \
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} \
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} \
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} else { /* ci < 0, cq >= 0 */ \
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} else { \ // ci < 0, cq >= 0
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if (cq < -ci) { \
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if (cq < -ci) { \
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v = -ci + (cq >> 1); \
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v = -ci + (cq >> 1); \
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} else { \
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} else { \
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@ -563,13 +568,13 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
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} \
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} \
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} \
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} \
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} else { \
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} else { \
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if(cq < 0) { /* ci >= 0, cq < 0 */ \
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if(cq < 0) { \ // ci >= 0, cq < 0
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if (-cq < ci) { \
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if (-cq < ci) { \
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v = ci - (cq >> 1); \
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v = ci - (cq >> 1); \
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} else { \
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} else { \
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v = -cq + (ci >> 1); \
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v = -cq + (ci >> 1); \
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} \
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} \
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} else { /* ci >= 0, cq >= 0 */ \
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} else { \ // ci >= 0, cq >= 0
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if (cq < ci) { \
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if (cq < ci) { \
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v = ci + (cq >> 1); \
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v = ci + (cq >> 1); \
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} else { \
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} else { \
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@ -578,6 +583,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
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} \
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} \
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} \
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} \
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}
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}
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*/
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switch(Demod.state) {
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switch(Demod.state) {
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case DEMOD_UNSYNCD:
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case DEMOD_UNSYNCD:
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@ -319,18 +319,7 @@ static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// close to what we want.
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// close to what we want.
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if(getNext) {
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if(getNext) {
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int8_t r;
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int8_t r = ABS(b) + ABS(prev);
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if(b < 0) {
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r = -b;
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} else {
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r = b;
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}
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if(prev < 0) {
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r -= prev;
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} else {
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r += prev;
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}
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dest[c++] = (uint8_t)r;
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dest[c++] = (uint8_t)r;
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@ -468,18 +457,7 @@ static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// close to what we want.
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// close to what we want.
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if(getNext) {
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if(getNext) {
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int8_t r;
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int8_t r = ABS(b) + ABS(prev);
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if(b < 0) {
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r = -b;
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} else {
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r = b;
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}
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if(prev < 0) {
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r -= prev;
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} else {
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r += prev;
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}
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dest[c++] = (uint8_t)r;
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dest[c++] = (uint8_t)r;
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@ -648,18 +626,7 @@ void AcquireRawAdcSamplesIso15693(void)
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// close to what we want.
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// close to what we want.
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if(getNext) {
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if(getNext) {
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int8_t r;
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int8_t r = ABS(b) + ABS(prev);
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if(b < 0) {
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r = -b;
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} else {
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r = b;
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}
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if(prev < 0) {
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r -= prev;
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} else {
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r += prev;
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}
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dest[c++] = (uint8_t)r;
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dest[c++] = (uint8_t)r;
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@ -713,18 +680,7 @@ void RecordRawAdcSamplesIso15693(void)
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// every other is Q. We just want power, so abs(I) + abs(Q) is
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// close to what we want.
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// close to what we want.
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if(getNext) {
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if(getNext) {
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int8_t r;
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int8_t r = ABS(b) + ABS(prev);
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if(b < 0) {
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r = -b;
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} else {
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r = b;
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}
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if(prev < 0) {
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r -= prev;
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} else {
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r += prev;
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}
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dest[c++] = (uint8_t)r;
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dest[c++] = (uint8_t)r;
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@ -7,9 +7,6 @@
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#define T0_PCF 8 //period for the pcf7931 in us
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#define T0_PCF 8 //period for the pcf7931 in us
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#define ALLOC 16
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#define ALLOC 16
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#define abs(x) ( ((x)<0) ? -(x) : (x) )
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#define max(x,y) ( x<y ? y:x)
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int DemodPCF7931(uint8_t **outBlocks) {
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int DemodPCF7931(uint8_t **outBlocks) {
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uint8_t bits[256] = {0x00};
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uint8_t bits[256] = {0x00};
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@ -72,7 +69,7 @@ int DemodPCF7931(uint8_t **outBlocks) {
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// Switch depending on lc length:
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// Switch depending on lc length:
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// Tolerance is 1/8 of clock rate (arbitrary)
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// Tolerance is 1/8 of clock rate (arbitrary)
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if (abs(lc-clock/4) < tolerance) {
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if (ABS(lc-clock/4) < tolerance) {
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// 16T0
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// 16T0
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if((i - pmc) == lc) { /* 16T0 was previous one */
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if((i - pmc) == lc) { /* 16T0 was previous one */
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/* It's a PMC ! */
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/* It's a PMC ! */
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@ -84,7 +81,7 @@ int DemodPCF7931(uint8_t **outBlocks) {
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else {
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else {
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pmc = i;
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pmc = i;
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}
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}
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} else if (abs(lc-clock/2) < tolerance) {
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} else if (ABS(lc-clock/2) < tolerance) {
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// 32TO
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// 32TO
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if((i - pmc) == lc) { /* 16T0 was previous one */
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if((i - pmc) == lc) { /* 16T0 was previous one */
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/* It's a PMC ! */
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/* It's a PMC ! */
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@ -99,7 +96,7 @@ int DemodPCF7931(uint8_t **outBlocks) {
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}
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}
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else
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else
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half_switch++;
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half_switch++;
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} else if (abs(lc-clock) < tolerance) {
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} else if (ABS(lc-clock) < tolerance) {
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// 64TO
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// 64TO
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bits[bitidx++] = 1;
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bits[bitidx++] = 1;
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} else {
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} else {
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@ -204,7 +201,7 @@ void ReadPCF7931() {
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Blocks[0][ALLOC] = 1;
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Blocks[0][ALLOC] = 1;
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memcpy(Blocks[1], tmpBlocks[i+1], 16);
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memcpy(Blocks[1], tmpBlocks[i+1], 16);
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Blocks[1][ALLOC] = 1;
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Blocks[1][ALLOC] = 1;
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max_blocks = max((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
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max_blocks = MAX((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
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// Debug print
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// Debug print
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Dbprintf("(dbg) Max blocks: %d", max_blocks);
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Dbprintf("(dbg) Max blocks: %d", max_blocks);
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num_blocks = 2;
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num_blocks = 2;
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@ -262,9 +262,9 @@ void askAmp(uint8_t *BitStream, size_t size)
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{
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{
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for(size_t i = 1; i<size; i++){
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for(size_t i = 1; i<size; i++){
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if (BitStream[i]-BitStream[i-1]>=30) //large jump up
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if (BitStream[i]-BitStream[i-1]>=30) //large jump up
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BitStream[i]=127;
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BitStream[i]=255;
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else if(BitStream[i]-BitStream[i-1]<=-20) //large jump down
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else if(BitStream[i]-BitStream[i-1]<=-20) //large jump down
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BitStream[i]=-127;
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BitStream[i]=0;
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}
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}
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return;
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return;
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}
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}
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@ -464,10 +464,10 @@ int gProxII_Demod(uint8_t BitStream[], size_t *size)
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//return start position
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//return start position
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return (int) startIdx;
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return (int) startIdx;
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}
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}
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return -5;
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return -5; //spacer bits not found - not a valid gproxII
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}
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}
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//translate wave to 11111100000 (1 for each short wave 0 for each long wave)
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//translate wave to 11111100000 (1 for each short wave [higher freq] 0 for each long wave [lower freq])
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size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow)
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size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow)
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{
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{
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size_t last_transition = 0;
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size_t last_transition = 0;
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@ -491,6 +491,7 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow
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// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
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// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
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// or 10 (fc/10) cycles but in practice due to noise etc we may end up with anywhere
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// or 10 (fc/10) cycles but in practice due to noise etc we may end up with anywhere
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// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
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// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
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// (could also be fc/5 && fc/7 for fsk1 = 4-9)
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for(idx = 161; idx < size-20; idx++) {
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for(idx = 161; idx < size-20; idx++) {
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// threshold current value
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// threshold current value
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@ -498,23 +499,24 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow
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else dest[idx] = 1;
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else dest[idx] = 1;
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// Check for 0->1 transition
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// Check for 0->1 transition
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if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition
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if (dest[idx-1] < dest[idx]) {
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preLastSample = LastSample;
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preLastSample = LastSample;
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LastSample = currSample;
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LastSample = currSample;
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currSample = idx-last_transition;
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currSample = idx-last_transition;
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if (currSample < (fclow-2)){ //0-5 = garbage noise (or 0-3)
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if (currSample < (fclow-2)) { //0-5 = garbage noise (or 0-3)
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//do nothing with extra garbage
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//do nothing with extra garbage
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} else if (currSample < (fchigh-1)) { //6-8 = 8 sample waves or 3-6 = 5
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} else if (currSample < (fchigh-1)) { //6-8 = 8 sample waves (or 3-6 = 5)
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//correct previous 9 wave surrounded by 8 waves (or 6 surrounded by 5)
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if (LastSample > (fchigh-2) && (preLastSample < (fchigh-1) || preLastSample == 0 )){
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if (LastSample > (fchigh-2) && (preLastSample < (fchigh-1) || preLastSample == 0 )){
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dest[numBits-1]=1; //correct previous 9 wave surrounded by 8 waves
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dest[numBits-1]=1;
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}
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}
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dest[numBits++]=1;
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dest[numBits++]=1;
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} else if (currSample > (fchigh) && !numBits) { //12 + and first bit = garbage
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} else if (currSample > (fchigh) && !numBits) { //12 + and first bit = unusable garbage
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//do nothing with beginning garbage
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//do nothing with beginning garbage
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} else if (currSample == (fclow+1) && LastSample == (fclow-1)) { // had a 7 then a 9 should be two 8's
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} else if (currSample == (fclow+1) && LastSample == (fclow-1)) { // had a 7 then a 9 should be two 8's (or 4 then a 6 should be two 5's)
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dest[numBits++]=1;
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dest[numBits++]=1;
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} else { //9+ = 10 sample waves
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} else { //9+ = 10 sample waves (or 6+ = 7)
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dest[numBits++]=0;
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dest[numBits++]=0;
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}
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}
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last_transition = idx;
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last_transition = idx;
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@ -524,6 +526,7 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow
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}
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}
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//translate 11111100000 to 10
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//translate 11111100000 to 10
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||||||
|
//rfLen = clock, fchigh = larger field clock, fclow = smaller field clock
|
||||||
size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen,
|
size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen,
|
||||||
uint8_t invert, uint8_t fchigh, uint8_t fclow)
|
uint8_t invert, uint8_t fchigh, uint8_t fclow)
|
||||||
{
|
{
|
||||||
|
@ -533,8 +536,9 @@ size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen,
|
||||||
uint32_t n=1;
|
uint32_t n=1;
|
||||||
for( idx=1; idx < size; idx++) {
|
for( idx=1; idx < size; idx++) {
|
||||||
n++;
|
n++;
|
||||||
if (dest[idx]==lastval) continue;
|
if (dest[idx]==lastval) continue; //skip until we hit a transition
|
||||||
|
|
||||||
|
//find out how many bits (n) we collected
|
||||||
//if lastval was 1, we have a 1->0 crossing
|
//if lastval was 1, we have a 1->0 crossing
|
||||||
if (dest[idx-1]==1) {
|
if (dest[idx-1]==1) {
|
||||||
n = (n * fclow + rfLen/2) / rfLen;
|
n = (n * fclow + rfLen/2) / rfLen;
|
||||||
|
@ -543,6 +547,7 @@ size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen,
|
||||||
}
|
}
|
||||||
if (n == 0) n = 1;
|
if (n == 0) n = 1;
|
||||||
|
|
||||||
|
//add to our destination the bits we collected
|
||||||
memset(dest+numBits, dest[idx-1]^invert , n);
|
memset(dest+numBits, dest[idx-1]^invert , n);
|
||||||
numBits += n;
|
numBits += n;
|
||||||
n=0;
|
n=0;
|
||||||
|
@ -1495,8 +1500,8 @@ int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert)
|
||||||
numBits += (firstFullWave / *clock);
|
numBits += (firstFullWave / *clock);
|
||||||
//set start of wave as clock align
|
//set start of wave as clock align
|
||||||
lastClkBit = firstFullWave;
|
lastClkBit = firstFullWave;
|
||||||
//PrintAndLog("DEBUG: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen);
|
if (g_debugMode==2) prnt("DEBUG PSK: firstFullWave: %u, waveLen: %u",firstFullWave,fullWaveLen);
|
||||||
//PrintAndLog("DEBUG: clk: %d, lastClkBit: %d", *clock, lastClkBit);
|
if (g_debugMode==2) prnt("DEBUG: clk: %d, lastClkBit: %u, fc: %u", *clock, lastClkBit,(unsigned int) fc);
|
||||||
waveStart = 0;
|
waveStart = 0;
|
||||||
dest[numBits++] = curPhase; //set first read bit
|
dest[numBits++] = curPhase; //set first read bit
|
||||||
for (i = firstFullWave + fullWaveLen - 1; i < *size-3; i++){
|
for (i = firstFullWave + fullWaveLen - 1; i < *size-3; i++){
|
||||||
|
@ -1679,7 +1684,7 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) {
|
||||||
i=0;
|
i=0;
|
||||||
// warning - overwriting buffer given with raw wave data with ST removed...
|
// warning - overwriting buffer given with raw wave data with ST removed...
|
||||||
while ( dataloc < bufsize-(clk/2) ) {
|
while ( dataloc < bufsize-(clk/2) ) {
|
||||||
//compensate for long high at end of ST not being high... (we cut out the high part)
|
//compensate for long high at end of ST not being high due to signal loss... (and we cut out the start of wave high part)
|
||||||
if (buffer[dataloc]<high && buffer[dataloc]>low && buffer[dataloc+3]<high && buffer[dataloc+3]>low) {
|
if (buffer[dataloc]<high && buffer[dataloc]>low && buffer[dataloc+3]<high && buffer[dataloc+3]>low) {
|
||||||
for(i=0; i < clk/2-tol; ++i) {
|
for(i=0; i < clk/2-tol; ++i) {
|
||||||
buffer[dataloc+i] = high+5;
|
buffer[dataloc+i] = high+5;
|
||||||
|
@ -1694,7 +1699,7 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) {
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
newloc += i;
|
newloc += i;
|
||||||
//skip next ST
|
//skip next ST - we just assume it will be there from now on...
|
||||||
dataloc += clk*4;
|
dataloc += clk*4;
|
||||||
}
|
}
|
||||||
*size = newloc;
|
*size = newloc;
|
||||||
|
|
|
@ -24,6 +24,10 @@ typedef unsigned char byte_t;
|
||||||
#ifndef MAX
|
#ifndef MAX
|
||||||
# define MAX(a, b) (((a) > (b)) ? (a) : (b))
|
# define MAX(a, b) (((a) > (b)) ? (a) : (b))
|
||||||
#endif
|
#endif
|
||||||
|
#ifndef ABS
|
||||||
|
# define ABS(a) ( ((a)<0) ? -(a) : (a) )
|
||||||
|
#endif
|
||||||
|
|
||||||
|
|
||||||
#define RAMFUNC __attribute((long_call, section(".ramfunc")))
|
#define RAMFUNC __attribute((long_call, section(".ramfunc")))
|
||||||
|
|
||||||
|
|
Loading…
Add table
Add a link
Reference in a new issue