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- timeout corrections

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- global parameter for password catch (used in standalone mode)
This commit is contained in:
tharexde 2021-02-06 20:45:44 +01:00
parent ed642855d8
commit c5ac3c16f5
1 changed files with 23 additions and 18 deletions
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41
armsrc/em4x50.c
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@ -61,6 +61,7 @@
// div
#define EM4X50_TAG_WORD 45
#define EM4X50_TAG_MAX_NO_BYTES 136
#define EM4X50_TIMEOUT_PULSE_EVAL 2500
int gHigh = 190;
int gLow = 60;
@ -72,6 +73,8 @@ bool gLogin = false;
// compared to operations like read, write, login, so it is necessary to
// to be able to identfiy it
bool gWritePasswordProcess = false;
// if reader sends a different password than "expected" -> save it
uint32_t gPassword = 0;
// extract and check parities
// return result of parity check and extracted plain data
@ -251,7 +254,8 @@ static bool invalid_bit(void) {
static uint32_t get_pulse_length(void) {
int32_t timeout = (T0 * 3 * EM4X50_T_TAG_FULL_PERIOD), tval = 0;
//int32_t timeout = (T0 * 3 * EM4X50_T_TAG_FULL_PERIOD), tval = 0;
int32_t timeout = EM4X50_TIMEOUT_PULSE_EVAL, tval = 0;
// iterates pulse length (low -> high -> low)
@ -260,23 +264,25 @@ static uint32_t get_pulse_length(void) {
while (sample > gLow && (timeout--))
sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
if (timeout == 0)
if (timeout <= 0)
return 0;
tval = GetTicks();
timeout = (T0 * 3 * EM4X50_T_TAG_FULL_PERIOD);
//timeout = (T0 * 3 * EM4X50_T_TAG_FULL_PERIOD);
timeout = EM4X50_TIMEOUT_PULSE_EVAL;
while (sample < gHigh && (timeout--))
sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
if (timeout == 0)
if (timeout <= 0)
return 0;
timeout = (T0 * 3 * EM4X50_T_TAG_FULL_PERIOD);
//timeout = (T0 * 3 * EM4X50_T_TAG_FULL_PERIOD);
timeout = EM4X50_TIMEOUT_PULSE_EVAL;
while (sample > gLow && (timeout--))
sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
if (timeout == 0)
if (timeout <= 0)
return 0;
return GetTicks() - tval;
@ -857,16 +863,16 @@ void em4x50_read(em4x50_data_t *etd) {
LED_C_ON();
if (get_signalproperties() && find_em4x50_tag()) {
LED_C_OFF();
LED_D_ON();
LED_C_OFF();
LED_D_ON();
// try to login with given password
if (etd->pwd_given)
blogin = (login(etd->password1) == PM3_SUCCESS);
// try to login with given password
if (etd->pwd_given)
blogin = (login(etd->password1) == PM3_SUCCESS);
// only one word has to be read -> first word read = last word read
if (blogin)
status = selective_read(etd->addresses, words);
// only one word has to be read -> first word read = last word read
if (blogin)
status = selective_read(etd->addresses, words);
}
LEDsoff();
@ -1417,8 +1423,6 @@ static void em4x50_sim_send_nak(void) {
// standard read mode process (simulation mode)
static int em4x50_sim_handle_standard_read_command(uint32_t *tag) {
int command = 0;
// extract control data
int fwr = reflect32(tag[EM4X50_CONTROL]) & 0xFF; // first word read
int lwr = (reflect32(tag[EM4X50_CONTROL]) >> 8) & 0xFF; // last word read
@ -1458,8 +1462,6 @@ static int em4x50_sim_handle_standard_read_command(uint32_t *tag) {
// selective read mode process (simulation mode)
static int em4x50_sim_handle_selective_read_command(uint32_t *tag) {
int command = 0;
// read password
uint32_t address = 0;
bool addr = em4x50_sim_read_word(&address);
@ -1530,6 +1532,9 @@ static int em4x50_sim_handle_login_command(uint32_t *tag) {
em4x50_sim_send_nak();
gLogin = false;
LED_D_OFF();
// save transmitted password for future use (e.g. standalone mode)
gPassword = password;
}
// continue with standard read mode
return EM4X50_COMMAND_STANDARD_READ;