adjust lf t55xx read commands

seems to make them a lot more accurate for me

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index 36420e576a8bfd7f04f9728b6fcc6f839b3888e0..0be81bc21647e34dbae8a95062275ee8e187e251 100644 (file)
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -1085,6 +1085,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
 #define T55x7_MODULATION_FSK2a         0x00007000
 #define T55x7_MODULATION_MANCHESTER    0x00008000
 #define T55x7_MODULATION_BIPHASE       0x00010000
+#define T55x7_MODULATION_DIPHASE       0x00018000
 #define T55x7_BITRATE_RF_8             0
 #define T55x7_BITRATE_RF_16            0x00040000
 #define T55x7_BITRATE_RF_32            0x00080000
@@ -1126,7 +1127,9 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
 #define WRITE_1   50*8 // was 400 // SPEC: 48*8 to 64*8 - typ 56*8 (or 56fc)  432 for T55x7; 448 for E5550
 
 #define T55xx_SAMPLES_SIZE      12000 // 32 x 32 x 10  (32 bit times numofblock (7), times clock skip..)
-
+#define T55xx_READ_UPPER_THRESHOLD 128+40  // 50
+#define T55xx_READ_TOL   5
+//#define T55xx_READ_LOWER_THRESHOLD 128-40  //-50
 // Write one bit to card
 void T55xxWriteBit(int bit)
 {
@@ -1148,7 +1151,7 @@ void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMod
 
        // Set up FPGA, 125kHz
        // Wait for config.. (192+8190xPOW)x8 == 67ms
-       LFSetupFPGAForADC(0, true);
+       LFSetupFPGAForADC(95, true);
 
        // Now start writting
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
@@ -1184,7 +1187,7 @@ void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMod
 void TurnReadLFOn(){
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
        // Give it a bit of time for the resonant antenna to settle.
-       SpinDelayUs(8*150);
+       SpinDelayUs(50*8); //155*8
 }
 
 
@@ -1196,13 +1199,26 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
        uint16_t bufferlength = BigBuf_max_traceLen();
        if ( bufferlength > T55xx_SAMPLES_SIZE )
                bufferlength = T55xx_SAMPLES_SIZE;
-
+       Block &= 0x7; //make sure block is at max 7
        // Clear destination buffer before sending the command
        memset(dest, 0x80, bufferlength);
 
        // Set up FPGA, 125kHz
        // Wait for config.. (192+8190xPOW)x8 == 67ms
-       LFSetupFPGAForADC(0, true);
+
+       LFSetupFPGAForADC(95, true);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
+
+       // Connect the A/D to the peak-detected low-frequency path.
+       SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
+
+       // Now set up the SSC to get the ADC samples that are now streaming at us.
+       FpgaSetupSsc();
+
+       // Give it a bit of time for the resonant antenna to settle.
+       //SpinDelayUs(8*200);  //192FC
+       SpinDelay(50);
+
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        SpinDelayUs(START_GAP);
 
@@ -1224,16 +1240,34 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
        TurnReadLFOn();
        // Now do the acquisition
        i = 0;
+       bool startFound = false;
+       bool highFound = false;
+       uint8_t curSample = 0;
+       uint8_t firstSample = 0;
        for(;;) {
                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) {
-                       dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-                       i++;
-                       LED_D_OFF();
-                       if (i >= bufferlength) break;
+                       curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+                       
+                       // find first high sample
+                       if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
+                               if (curSample > firstSample) firstSample = curSample;
+                               highFound = true;
+                       } else if (!highFound) {
+                               continue;
+                       }
+
+                       // skip until samples begin to change
+                       if (startFound || curSample < firstSample-T55xx_READ_TOL){
+                               if (!startFound) dest[i++] = firstSample;
+                               startFound = true;
+                               dest[i++] = curSample;
+                               LED_D_OFF();
+                               if (i >= bufferlength) break;
+                       }
                }
        }
 
@@ -1266,17 +1300,34 @@ void T55xxReadTrace(void){
        TurnReadLFOn();
 
        // Now do the acquisition
+       bool startFound = false;// false;
+       bool highFound = false;
+       uint8_t curSample = 0;
+       uint8_t firstSample = 0;
        for(;;) {
                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) {
-                       dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-                       i++;
-                       LED_D_OFF();
+                       curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+                       
+                       // find first high sample
+                       if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
+                               if (curSample > firstSample) firstSample = curSample;
+                               highFound = true;
+                       } else if (!highFound) {
+                               continue;
+                       }
 
-                       if (i >= bufferlength) break;
+                       // skip until samples begin to change
+                       if (startFound || curSample < firstSample-T55xx_READ_TOL){
+                               if (!startFound) dest[i++] = firstSample;
+                               startFound = true;
+                               dest[i++] = curSample;
+                               LED_D_OFF();
+                               if (i >= bufferlength) break;
+                       }
                }
        }
 

diff --git a/client/cmdlft55xx.c b/client/cmdlft55xx.c
index 887547248abe6e3945a4f6153bbcd493972d0e93..c2a99ce388d3db6a047d9c30cd5213106c6fe63f 100644 (file)
--- a/client/cmdlft55xx.c
+++ b/client/cmdlft55xx.c
@@ -270,8 +270,8 @@ bool DecodeT55xxBlock(){
        DemodBufferLen = 0x00;\r
 \r
        //trim 1/2 a clock from beginning\r
-       snprintf(cmdStr, sizeof(buf),"%d", bitRate[config.bitrate]/2 );\r
-       CmdLtrim(cmdStr);\r
+       //snprintf(cmdStr, sizeof(buf),"%d", bitRate[config.bitrate]/2 );\r
+       //CmdLtrim(cmdStr);\r
        switch( config.modulation ){\r
                case DEMOD_FSK:\r
                        snprintf(cmdStr, sizeof(buf),"%d %d", bitRate[config.bitrate], config.inverted );\r
@@ -333,7 +333,7 @@ int CmdT55xxDetect(const char *Cmd){
 \r
 // detect configuration?\r
 bool tryDetectModulation(){\r
-       char cmdStr[8] = {0};\r
+       //char cmdStr[8] = {0};\r
        uint8_t hits = 0;\r
        t55xx_conf_block_t tests[15];\r
        int bitRate=0;\r
@@ -341,8 +341,8 @@ bool tryDetectModulation(){
        save_restoreGB(1);\r
        if (GetFskClock("", FALSE, FALSE)){ \r
                fskClocks(&fc1, &fc2, &clk, FALSE);\r
-               sprintf(cmdStr,"%d", clk/2);\r
-               CmdLtrim(cmdStr);\r
+               //sprintf(cmdStr,"%d", clk/2);\r
+               //CmdLtrim(cmdStr);\r
                if ( FSKrawDemod("0 0", FALSE) && test(DEMOD_FSK, &tests[hits].offset, &bitRate)){\r
                        tests[hits].modulation = DEMOD_FSK;\r
                        if (fc1==8 && fc2 == 5)\r
@@ -369,8 +369,8 @@ bool tryDetectModulation(){
        } else {\r
                clk = GetAskClock("", FALSE, FALSE);\r
                if (clk>0) {\r
-                       sprintf(cmdStr,"%d", clk/2);\r
-                       CmdLtrim(cmdStr);\r
+                       //sprintf(cmdStr,"%d", clk/2);\r
+                       //CmdLtrim(cmdStr);\r
                        if ( ASKDemod("0 0 0", FALSE, FALSE, 1) && test(DEMOD_ASK, &tests[hits].offset, &bitRate)) {\r
                                tests[hits].modulation = DEMOD_ASK;\r
                                tests[hits].bitrate = bitRate;\r
@@ -404,8 +404,8 @@ bool tryDetectModulation(){
                save_restoreGB(0);\r
                clk = GetNrzClock("", FALSE, FALSE);\r
                if (clk>0) {\r
-                       sprintf(cmdStr,"%d", clk/2);\r
-                       CmdLtrim(cmdStr);\r
+                       //sprintf(cmdStr,"%d", clk/2);\r
+                       //CmdLtrim(cmdStr);\r
                        if ( NRZrawDemod("0 0 1", FALSE)  && test(DEMOD_NRZ, &tests[hits].offset, &bitRate)) {\r
                                tests[hits].modulation = DEMOD_NRZ;\r
                                tests[hits].bitrate = bitRate;\r
@@ -427,9 +427,9 @@ bool tryDetectModulation(){
                save_restoreGB(0);\r
                clk = GetPskClock("", FALSE, FALSE);\r
                if (clk>0) {\r
-                       PrintAndLog("clk %d",clk);\r
-                       sprintf(cmdStr,"%d", clk/2);\r
-                       CmdLtrim(cmdStr);       \r
+                       //PrintAndLog("clk %d",clk);\r
+                       //sprintf(cmdStr,"%d", clk/2);\r
+                       //CmdLtrim(cmdStr);     \r
                        if ( PSKDemod("0 0 1", FALSE) && test(DEMOD_PSK1, &tests[hits].offset, &bitRate)) {\r
                                tests[hits].modulation = DEMOD_PSK1;\r
                                tests[hits].bitrate = bitRate;\r

diff --git a/common/lfdemod.c b/common/lfdemod.c
index a3a7a50087727fc1f85a7a5a8df881537e21e04e..3b9402cca18ef45f0dca6c788ef2adcad7a02df4 100644 (file)
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -369,7 +369,9 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow
        if (fclow==0) fclow=8;
        //set the threshold close to 0 (graph) or 128 std to avoid static
        uint8_t threshold_value = 123; 
-
+       size_t preLastSample = 0;
+       size_t LastSample = 0;
+       size_t currSample = 0;
        // sync to first lo-hi transition, and threshold
 
        // Need to threshold first sample
@@ -389,13 +391,22 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow
 
                // Check for 0->1 transition
                if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition
-                       if ((idx-last_transition)<(fclow-2)){            //0-5 = garbage noise
+                       preLastSample = LastSample;
+                       LastSample = currSample;
+                       currSample = idx-last_transition;
+                       if (currSample < (fclow-2)){            //0-5 = garbage noise
                                //do nothing with extra garbage
-                       } else if ((idx-last_transition) < (fchigh-1)) { //6-8 = 8 waves
+                       } else if (currSample < (fchigh-1)) { //6-8 = 8 sample waves
+                               if (LastSample > (fchigh-2) && preLastSample < (fchigh-1)){
+                                       dest[numBits-1]=1;  //correct last 9 wave surrounded by 8 waves
+                               }
                                dest[numBits++]=1;
-                       } else if ((idx-last_transition) > (fchigh+1) && !numBits) { //12 + and first bit = garbage 
+
+                       } else if (currSample > (fchigh+1) && !numBits) { //12 + and first bit = garbage 
                                //do nothing with beginning garbage
-                       } else {                                         //9+ = 10 waves
+                       } else if (currSample == (fclow+1) && LastSample == (fclow-1)) { // had a 7 then a 9 should be two 8's
+                               dest[numBits++]=1;
+                       } else {                                         //9+ = 10 sample waves
                                dest[numBits++]=0;
                        }
                        last_transition = idx;