RfidResearchGroup/proxmark3
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CHG: this timing should be quite good. needs to be verified.

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This commit is contained in:
iceman1001 2016-09-10 22:47:11 +02:00
parent b4a6775b5e
commit db44e049b0
1 changed files with 18 additions and 16 deletions
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34
armsrc/legicrf.c
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@ -62,16 +62,16 @@ static void setup_timer(void) {
//#define RWD_TIME_1 150 /* RWD_TIME_PAUSE off, 80us on = 100us */
//#define RWD_TIME_0 90 /* RWD_TIME_PAUSE off, 40us on = 60us */
//#define RWD_TIME_PAUSE 30 /* 20us */
#define US_CALIBRATION 4
#define RWD_TIME_1 80-US_CALIBRATION /* READER_TIME_PAUSE off, 80us on = 100us */
#define RWD_TIME_0 40-US_CALIBRATION /* READER_TIME_PAUSE off, 40us on = 60us */
#define RWD_TIME_PAUSE 20-US_CALIBRATION /* 20us */
#define RWD_TIME_1 80-4 /* READER_TIME_PAUSE off, 80us on = 100us */
#define RWD_TIME_0 40-4 /* READER_TIME_PAUSE off, 40us on = 60us */
#define RWD_TIME_PAUSE 20-4 /* 20us */
#define TAG_BIT_PERIOD 100-8 // 100us for every bit
#define TAG_BIT_PERIOD 100-US_CALIBRATION // 100us for every bit
#define RWD_TIME_FUZZ 20 /* rather generous 13us, since the peak detector + hysteresis fuzz quite a bit */
#define TAG_TIME_WAIT 330 // 330us from READER frame end to TAG frame start, experimentally determined (490)
#define TAG_TIME_WAIT 330 - US_CALIBRATION // 330us from READER frame end to TAG frame start, experimentally determined (490)
#define RDW_TIME_WAIT 258 //
@ -278,17 +278,20 @@ static void frame_sendAsReader(uint32_t data, uint8_t bits){
*/
static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits, uint8_t crypt) {
uint32_t starttime = GetCountUS();
frame_clean(f);
uint8_t i = 0, edges = 0;
uint16_t lsfr = 0;
uint32_t the_bit = 1, next_bit_at, data;
uint32_t the_bit = 1, next_bit_at = 0, data;
int old_level = 0, level = 0;
if(bits > 32) bits = 32;
uint32_t starttime = GetCountUS();
AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
// calibrate the prng.
legic_prng_forward(2);
//CalibratePrng( starttime );
@ -301,15 +304,12 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits, ui
data = lsfr;
next_bit_at = GetCountUS() + TAG_BIT_PERIOD;
//FIXED time between sending frame and now listening frame. 330us
uint32_t icetime = TAG_TIME_WAIT - ( GetCountUS() - stop_send_frame_us );
//
WAIT( icetime ); // 21.3us inc.
WAIT( icetime ); // 8-10us
AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
next_bit_at = GetCountUS();
next_bit_at += TAG_BIT_PERIOD;
for( i = 0; i < bits; i++) {
edges = 0;
@ -336,6 +336,8 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits, ui
f->bits = bits;
// log
stop_send_frame_us = GetCountUS();
uint8_t cmdbytes[] = {
(data & 0xFF),
(data >> 8) & 0xFF,
@ -347,7 +349,7 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits, ui
icetime & 0xff,
(icetime >> 8) & 0xFF
};
LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GetCountUS(), NULL, FALSE);
LogTrace(cmdbytes, sizeof(cmdbytes), starttime, stop_send_frame_us, NULL, FALSE);
}