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FIX: @marshmellow42 's ST detection fix.

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FIX: lfops.c and em4x05 command timings.
This commit is contained in:
iceman1001 2017-02-28 19:20:12 +01:00
parent 4eabb8ad38
commit c24364a8a4
2 changed files with 19 additions and 21 deletions
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36
armsrc/lfops.c
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@ -1179,6 +1179,10 @@ void TurnReadLFOn(uint32_t delay) {
// Give it a bit of time for the resonant antenna to settle.
WaitUS(delay);
}
void TurnReadLF_off(uint32_t delay) {
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
WaitUS(delay);
}
// Write one bit to card
void T55xxWriteBit(int bit) {
@ -1649,15 +1653,8 @@ void SendForward(uint8_t fwd_bit_count) {
// 55FC * 8us == 440us / 21.3 === 20.65 steps. could be too short. Go for 56FC instead
// 32FC * 8us == 256us / 21.3 == 12.018 steps. ok
// 16FC * 8us == 128us / 21.3 == 6.009 steps. ok
#ifndef EM_START_GAP
#define EM_START_GAP 60*8
#endif
#ifndef EM_ONE_GAP
#define EM_ONE_GAP 32*8
#endif
#ifndef EM_ZERO_GAP
# define EM_ZERO_GAP 16*8
#define EM_START_GAP 55*8
#endif
fwd_write_ptr = forwardLink_data;
@ -1670,19 +1667,16 @@ void SendForward(uint8_t fwd_bit_count) {
fwd_bit_sz--; //prepare next bit modulation
fwd_write_ptr++;
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
WaitUS(EM_START_GAP);
TurnReadLFOn(16);
TurnReadLF_off(EM_START_GAP);
TurnReadLFOn(18*8);
// now start writting with bitbanging the antenna.
while(fwd_bit_sz-- > 0) { //prepare next bit modulation
if(((*fwd_write_ptr++) & 1) == 1)
WaitUS(EM_ONE_GAP);
else {
//These timings work for 4469/4269/4305
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
WaitUS(20);
TurnReadLFOn(12);
if(((*fwd_write_ptr++) & 1) == 1) {
WaitUS(32);
} else {
TurnReadLF_off(23*8);
TurnReadLFOn(18*8);
}
}
}
@ -1693,7 +1687,7 @@ void EM4xLogin(uint32_t pwd) {
len = Prepare_Cmd( FWD_CMD_LOGIN );
len += Prepare_Data( pwd & 0xFFFF, pwd >> 16 );
SendForward(len);
WaitMS(20); // no wait for login command.
//WaitUS(20); // no wait for login command.
// should receive
// 0000 1010 ok.
// 0000 0001 fail
@ -1722,7 +1716,7 @@ void EM4xReadWord(uint8_t addr, uint32_t pwd, uint8_t usepwd) {
SendForward(len);
WaitUS(400);
// Now do the acquisition
DoPartialAcquisition(20, true, 6000);
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
@ -1757,7 +1751,7 @@ void EM4xWriteWord(uint32_t flag, uint32_t data, uint32_t pwd) {
SendForward(len);
//Wait 20ms for write to complete?
WaitMS(6);
WaitMS(7);
//Capture response if one exists
DoPartialAcquisition(20, true, 6000);

4
common/lfdemod.c
View file

@ -1845,6 +1845,10 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) {
for(i=0; i < clk/2-tol; ++i) {
buffer[dataloc+i] = high+5;
}
} //test for single sample outlier (high between two lows) in the case of very strong waves
if (buffer[dataloc] >= high && buffer[dataloc+2] <= low) {
buffer[dataloc] = buffer[dataloc+2];
buffer[dataloc+1] = buffer[dataloc+2];
}
for (i=0; i<datalen; ++i) {
if (i+newloc < bufsize) {