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send sync signal to clock when reset

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This commit is contained in:
iceman1001 2021-06-24 17:20:48 +02:00
parent 9ec32e1fe8
commit b993236be2
4 changed files with 60 additions and 27 deletions
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7
armsrc/hitag2.c
View file

@ -1148,6 +1148,9 @@ void SniffHitag2(void) {
// Enable and reset counter
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
// Assert a sync signal. This sets all timers to 0 on next active clock edge
AT91C_BASE_TCB->TCB_BCR = 1;
int frame_count = 0, response = 0, overflow = 0, lastbit = 1, tag_sof = 4;
bool rising_edge = false, reader_frame = false, bSkip = true;
uint8_t rx[HITAG_FRAME_LEN];
@ -1293,11 +1296,15 @@ void SniffHitag2(void) {
// Reset the timer to restart while-loop that receives frames
AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG;
AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG;
// Assert a sync signal. This sets all timers to 0 on next active clock edge
AT91C_BASE_TCB->TCB_BCR = 1;
}
LEDsoff();
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
set_tracing(false);

3
armsrc/lfadc.c
View file

@ -246,6 +246,9 @@ void lf_init(bool reader, bool simulate) {
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
// Assert a sync signal. This sets all timers to 0 on next active clock edge
AT91C_BASE_TCB->TCB_BCR = 1;
// Prepare data trace
uint32_t bufsize = 10000;

75
armsrc/pcf7931.c
View file

@ -14,13 +14,17 @@
#define ALLOC 16
size_t DemodPCF7931(uint8_t **outBlocks) {
// 2021 iceman, memor
uint8_t bits[256] = {0x00};
uint8_t blocks[8][16];
uint8_t *dest = BigBuf_get_addr();
int GraphTraceLen = BigBuf_max_traceLen();
if (GraphTraceLen > 18000)
if (GraphTraceLen > 18000) {
GraphTraceLen = 18000;
}
int i = 2, j, lastval, bitidx, half_switch;
int clock = 64;
@ -38,15 +42,17 @@ size_t DemodPCF7931(uint8_t **outBlocks) {
/* Find first local max/min */
if (dest[1] > dest[0]) {
while (i < GraphTraceLen) {
if (!(dest[i] > dest[i - 1]) && dest[i] > lmax)
if (!(dest[i] > dest[i - 1]) && dest[i] > lmax) {
break;
}
i++;
}
dir = 0;
} else {
while (i < GraphTraceLen) {
if (!(dest[i] < dest[i - 1]) && dest[i] < lmin)
if (!(dest[i] < dest[i - 1]) && dest[i] < lmin) {
break;
}
i++;
}
dir = 1;
@ -58,6 +64,7 @@ size_t DemodPCF7931(uint8_t **outBlocks) {
block_done = 0;
for (bitidx = 0; i < GraphTraceLen; i++) {
if ((dest[i - 1] > dest[i] && dir == 1 && dest[i] > lmax) || (dest[i - 1] < dest[i] && dir == 0 && dest[i] < lmin)) {
lc = i - lastval;
lastval = i;
@ -66,8 +73,8 @@ size_t DemodPCF7931(uint8_t **outBlocks) {
// Tolerance is 1/8 of clock rate (arbitrary)
if (ABS(lc - clock / 4) < tolerance) {
// 16T0
if ((i - pmc) == lc) { /* 16T0 was previous one */
/* It's a PMC ! */
if ((i - pmc) == lc) { // 16T0 was previous one
// It's a PMC
i += (128 + 127 + 16 + 32 + 33 + 16) - 1;
lastval = i;
pmc = 0;
@ -77,8 +84,8 @@ size_t DemodPCF7931(uint8_t **outBlocks) {
}
} else if (ABS(lc - clock / 2) < tolerance) {
// 32TO
if ((i - pmc) == lc) { /* 16T0 was previous one */
/* It's a PMC ! */
if ((i - pmc) == lc) { // 16T0 was previous one
// It's a PMC !
i += (128 + 127 + 16 + 32 + 33) - 1;
lastval = i;
pmc = 0;
@ -95,8 +102,9 @@ size_t DemodPCF7931(uint8_t **outBlocks) {
// Error
if (++warnings > 10) {
if (DBGLEVEL >= DBG_EXTENDED)
Dbprintf("Error: too many detection errors, aborting.");
if (DBGLEVEL >= DBG_EXTENDED) {
Dbprintf("Error: too many detection errors, aborting");
}
return 0;
}
@ -122,13 +130,19 @@ size_t DemodPCF7931(uint8_t **outBlocks) {
block_done = 0;
half_switch = 0;
}
if (i < GraphTraceLen)
if (i < GraphTraceLen) {
dir = (dest[i - 1] > dest[i]) ? 0 : 1;
}
}
if (bitidx == 255)
if (bitidx == 255) {
bitidx = 0;
warnings = 0;
if (num_blocks == 4) break;
}
if (num_blocks == 4) {
break;
}
}
memcpy(outBlocks, blocks, 16 * num_blocks);
return num_blocks;
@ -138,10 +152,11 @@ bool IsBlock0PCF7931(uint8_t *block) {
// assuming all RFU bits are set to 0
// if PAC is enabled password is set to 0
if (block[7] == 0x01) {
if (!memcmp(block, "\x00\x00\x00\x00\x00\x00\x00", 7)
&& !memcmp(block + 9, "\x00\x00\x00\x00\x00\x00\x00", 7)) {
if (!memcmp(block, "\x00\x00\x00\x00\x00\x00\x00", 7) &&
!memcmp(block + 9, "\x00\x00\x00\x00\x00\x00\x00", 7)) {
return true;
}
} else if (block[7] == 0x00) {
if (!memcmp(block + 9, "\x00\x00\x00\x00\x00\x00\x00", 7)) {
return true;
@ -158,14 +173,14 @@ bool IsBlock1PCF7931(uint8_t *block) {
uint8_t rlb = block[15];
if (block[10] == 0
&& block[11] == 0
&& block[12] == 0
&& block[13] == 0) {
&& block[11] == 0
&& block[12] == 0
&& block[13] == 0) {
// block 1 is sent only if (RLB >= 1 && RFB <= 1) or RB1 enabled
if (rfb <= rlb
&& rfb <= 9
&& rlb <= 9
&& ((rfb <= 1 && rlb >= 1) || rb1)) {
&& rfb <= 9
&& rlb <= 9
&& ((rfb <= 1 && rlb >= 1) || rb1)) {
return true;
}
}
@ -211,8 +226,9 @@ void ReadPCF7931(void) {
// exit if too many errors during reading
if (tries > 50 && (2 * errors > tries)) {
if (DBGLEVEL >= DBG_INFO)
if (DBGLEVEL >= DBG_INFO) {
Dbprintf("[!!] Error reading the tag, only partial content");
}
goto end;
}
@ -461,27 +477,32 @@ void SendCmdPCF7931(uint32_t *tab) {
//initialization of the timer
AT91C_BASE_PMC->PMC_PCER |= (0x1 << AT91C_ID_TC0);
AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; //clock at 48/32 MHz
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; // clock at 48/32 MHz
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;
// Assert a sync signal. This sets all timers to 0 on next active clock edge
AT91C_BASE_TCB->TCB_BCR = 1;
tempo = AT91C_BASE_TC0->TC_CV;
for (u = 0; tab[u] != 0; u += 3) {
// modulate antenna
HIGH(GPIO_SSC_DOUT);
while (tempo != tab[u])
while (tempo != tab[u]) {
tempo = AT91C_BASE_TC0->TC_CV;
}
// stop modulating antenna
LOW(GPIO_SSC_DOUT);
while (tempo != tab[u + 1])
while (tempo != tab[u + 1]) {
tempo = AT91C_BASE_TC0->TC_CV;
}
// modulate antenna
HIGH(GPIO_SSC_DOUT);
while (tempo != tab[u + 2])
while (tempo != tab[u + 2]) {
tempo = AT91C_BASE_TC0->TC_CV;
}
}
LED_A_OFF();

2
armsrc/ticks.c
View file

@ -125,6 +125,8 @@ void StartCountUS(void) {
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
// Assert a sync signal. This sets all timers to 0 on next active clock edge
AT91C_BASE_TCB->TCB_BCR = 1;
while (AT91C_BASE_TC1->TC_CV > 0);