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Fix and generify legic response code

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This commit is contained in:
henryk@ploetzli.ch 2009-10-16 22:07:00 +00:00
parent a7247d858b
commit aac23b2434
2 changed files with 37 additions and 10 deletions
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2
armsrc/Makefile
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@ -19,11 +19,11 @@ THUMBSRC = start.c \
lfops.c \
util.c \
hitag2.c \
legicrf.c \
usb.c
# These are to be compiled in ARM mode
ARMSRC = fpgaloader.c \
legicrf.c \
$(SRC_ISO14443a) \
$(SRC_ISO14443b)

45
armsrc/legicrf.c
View file

@ -14,7 +14,13 @@ static struct legic_frame {
int num_bits;
char data[10];
} current_frame;
static char response = 0x2b; /* 1101 01 */
static char queries[][4] = {
{7, 0x55}, /* 1010 101 */
};
static char responses[][4] = {
{6, 0x3b}, /* 1101 11 */
};
static void frame_send(char *response, int num_bytes, int num_bits)
{
@ -46,10 +52,22 @@ static void frame_send(char *response, int num_bytes, int num_bits)
static void frame_respond(struct legic_frame *f)
{
LED_D_ON();
if(f->num_bytes == 0 && f->num_bits == 7) {
/* This seems to be the initial dialogue, just send 6 bits of static data */
frame_send(&response, 0, 6);
int bitcount = f->num_bytes*8+f->num_bits;
int i, r=-1;
for(i=0; i<sizeof(queries)/sizeof(queries[0]); i++) {
if(bitcount == queries[i][0] && f->data[0] == queries[i][1] && f->data[1] == queries[i][2]) {
r = i;
break;
}
}
if(r != -1) {
frame_send(&responses[r][1], responses[r][0]/8, responses[r][0]%8);
LED_A_ON();
} else {
LED_A_OFF();
}
LED_D_OFF();
}
@ -67,11 +85,15 @@ static void frame_append_bit(struct legic_frame *f, int bit)
static int frame_is_empty(struct legic_frame *f)
{
return( (f->num_bytes + f->num_bits) <= 4 );
return( (f->num_bytes*8 + f->num_bits) <= 4 );
}
static void frame_handle(struct legic_frame *f)
{
if(f->num_bytes == 0 && f->num_bits == 6) {
/* Short path */
return;
}
if( !frame_is_empty(f) ) {
frame_respond(f);
}
@ -80,7 +102,8 @@ static void frame_handle(struct legic_frame *f)
static void frame_clean(struct legic_frame *f)
{
if(!frame_is_empty(f))
memset(f->data, 0, sizeof(f->data));
/* memset(f->data, 0, sizeof(f->data)); */
f->data[0] = f->data[1] = 0;
f->num_bits = 0;
f->num_bytes = 0;
}
@ -143,22 +166,26 @@ void LegicRfSimulate(void)
/* 1 bit */
emit(1);
active = 1;
LED_B_ON();
} else if(time > (BIT_TIME_0-BIT_TIME_FUZZ) && time < (BIT_TIME_0+BIT_TIME_FUZZ)) {
/* 0 bit */
emit(0);
active = 0;
} else {
active = 1;
LED_B_ON();
} else if(active) {
/* invalid */
emit(-1);
active = 0;
LED_B_OFF();
}
}
}
if(time >= (BIT_TIME_1+2*BIT_TIME_FUZZ) && active) {
if(time >= (BIT_TIME_1+BIT_TIME_FUZZ) && active) {
/* Frame end */
emit(-1);
active = 0;
LED_B_OFF();
}
if(time >= (20*BIT_TIME_1) && (AT91C_BASE_TC1->TC_SR & AT91C_TC_CLKSTA)) {