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a few bug fixes with adding hitag detection to...

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This commit is contained in:
marshmellow42 2016-12-16 14:04:39 -05:00
commit 921e63992c
2 changed files with 33 additions and 6 deletions
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31
armsrc/hitag2.c
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@ -1203,6 +1203,7 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
bQuiet = false;
bCrypto = false;
bAuthenticating = false;
bQuitTraceFull = true;
} break;
default: {
Dbprintf("Error, unknown function: %d",htf);
@ -1331,6 +1332,8 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
// we need to wait (T_Wait2 + half_tag_period) when the last was a 'one'.
// All timer values are in terms of T0 units
while(AT91C_BASE_TC0->TC_CV < T0*(t_wait+(HITAG_T_TAG_HALF_PERIOD*lastbit)));
//Dbprintf("DEBUG: Sending reader frame");
// Transmit the reader frame
hitag_reader_send_frame(tx,txlen);
@ -1360,7 +1363,9 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
bSkip = true;
tag_sof = reset_sof;
response = 0;
//Dbprintf("DEBUG: Waiting to receive frame");
uint32_t errorCount = 0;
// Receive frame, watch for at most T0*EOF periods
while (AT91C_BASE_TC1->TC_CV < T0*HITAG_T_WAIT_MAX) {
// Check if falling edge in tag modulation is detected
@ -1376,19 +1381,29 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
// Capture tag frame (manchester decoding using only falling edges)
if(ra >= HITAG_T_EOF) {
if (rxlen != 0) {
//DbpString("wierd1?");
//Dbprintf("DEBUG: Wierd1");
}
// Capture the T0 periods that have passed since last communication or field drop (reset)
// We always recieve a 'one' first, which has the falling edge after a half period |-_|
response = ra-HITAG_T_TAG_HALF_PERIOD;
} else if(ra >= HITAG_T_TAG_CAPTURE_FOUR_HALF) {
// Manchester coding example |-_|_-|-_| (101)
//need to test to verify we don't exceed memory...
//if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
// break;
//}
rx[rxlen / 8] |= 0 << (7-(rxlen%8));
rxlen++;
rx[rxlen / 8] |= 1 << (7-(rxlen%8));
rxlen++;
} else if(ra >= HITAG_T_TAG_CAPTURE_THREE_HALF) {
// Manchester coding example |_-|...|_-|-_| (0...01)
//need to test to verify we don't exceed memory...
//if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
// break;
//}
rx[rxlen / 8] |= 0 << (7-(rxlen%8));
rxlen++;
// We have to skip this half period at start and add the 'one' the second time
@ -1400,6 +1415,11 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
bSkip = !bSkip;
} else if(ra >= HITAG_T_TAG_CAPTURE_TWO_HALF) {
// Manchester coding example |_-|_-| (00) or |-_|-_| (11)
//need to test to verify we don't exceed memory...
//if ( ((rxlen+2) / 8) > HITAG_FRAME_LEN) {
// break;
//}
if (tag_sof) {
// Ignore bits that are transmitted during SOF
tag_sof--;
@ -1409,16 +1429,21 @@ void ReaderHitag(hitag_function htf, hitag_data* htd) {
rxlen++;
}
} else {
//Dbprintf("DEBUG: Wierd2");
errorCount++;
// Ignore wierd value, is to small to mean anything
}
}
//if we saw over 100 wierd values break it probably isn't hitag...
if (errorCount >100) break;
// We can break this loop if we received the last bit from a frame
if (AT91C_BASE_TC1->TC_CV > T0*HITAG_T_EOF) {
if (rxlen>0) break;
}
}
}
//Dbprintf("DEBUG: Done waiting for frame");
LED_B_OFF();
LED_D_OFF();
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;