WaitMS(10);
}
-// Wait max 300ms or until SCL goes LOW.
+// Wait max 1800ms or until SCL goes LOW.
+// It timeout reading response from card
// Which ever comes first
-static bool WaitSCL_L_300ms(void) {
- volatile uint16_t delay = 310;
+bool WaitSCL_L_timeout(void){
+ volatile uint16_t delay = 1800;
while ( delay-- ) {
// exit on SCL LOW
if (!SCL_read)
}
static bool I2C_WaitForSim() {
- // variable delay here.
- if (!WaitSCL_L_300ms())
+ // wait for data from card
+ if (!WaitSCL_L_timeout())
return false;
// 8051 speaks with smart card.
if ( !sc_rx_bytes(card_ptr->atr, &len) )
return false;
- uint8_t pos_td = 1;
- if ( (card_ptr->atr[1] & 0x10) == 0x10) pos_td++;
- if ( (card_ptr->atr[1] & 0x20) == 0x20) pos_td++;
- if ( (card_ptr->atr[1] & 0x40) == 0x40) pos_td++;
-
- // T0 indicate presence T=0 vs T=1. T=1 has checksum TCK
- if ( (card_ptr->atr[1] & 0x80) == 0x80) {
-
- pos_td++;
-
- // 1 == T1 , presence of checksum TCK
- if ( (card_ptr->atr[pos_td] & 0x01) == 0x01) {
- uint8_t chksum = 0;
- // xor property. will be zero when xored with chksum.
- for (uint8_t i = 1; i < len; ++i)
- chksum ^= card_ptr->atr[i];
- if ( chksum ) {
- if ( MF_DBGLEVEL > 2) DbpString("Wrong ATR checksum");
- }
- }
- }
-
card_ptr->atr_len = len;
LogTrace(card_ptr->atr, card_ptr->atr_len, 0, 0, NULL, false);