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Andreas fix for LEGIC MIM1024

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This commit is contained in:
adam@algroup.co.uk 2010-02-06 09:43:33 +00:00
parent 83a9b236fe
commit a2b1414f43
2 changed files with 49 additions and 17 deletions
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62
armsrc/legicrf.c
View file

@ -16,7 +16,7 @@
static struct legic_frame {
int bits;
uint16_t data;
uint32_t data;
} current_frame;
static crc_t legic_crc;
@ -114,8 +114,8 @@ static void frame_send_rwd(uint32_t data, int bits)
*/
static void frame_receive_rwd(struct legic_frame * const f, int bits, int crypt)
{
uint16_t the_bit = 1; /* Use a bitmask to save on shifts */
uint16_t data=0;
uint32_t the_bit = 1; /* Use a bitmask to save on shifts */
uint32_t data=0;
int i, old_level=0, edges=0;
int next_bit_at = TAG_TIME_WAIT;
@ -174,7 +174,7 @@ static void frame_clean(struct legic_frame * const f)
f->bits = 0;
}
static uint16_t perform_setup_phase_rwd(int iv)
static uint32_t perform_setup_phase_rwd(int iv)
{
/* Switch on carrier and let the tag charge for 1ms */
@ -191,8 +191,6 @@ static uint16_t perform_setup_phase_rwd(int iv)
while(timer->TC_CV < 387) ; /* ~ 258us */
frame_send_rwd(0x19, 6);
if(current_frame.data != 0x1d)
Dbprintf("probably don't know how to deal with %x card", current_frame.data);
return current_frame.data;
}
@ -220,28 +218,30 @@ static void switch_off_tag_rwd(void)
WDT_HIT();
}
/* calculate crc for a legic command */
static int LegicCRC(int byte_index, int value) {
static int LegicCRC(int byte_index, int value, int cmd_sz) {
crc_clear(&legic_crc);
crc_update(&legic_crc, 1, 1); /* CMD_READ */
crc_update(&legic_crc, byte_index, 8);
crc_update(&legic_crc, byte_index, cmd_sz-1);
crc_update(&legic_crc, value, 8);
return crc_finish(&legic_crc);
}
int legic_read_byte(int byte_index) {
int legic_read_byte(int byte_index, int cmd_sz) {
int byte;
legic_prng_forward(4); /* we wait anyways */
while(timer->TC_CV < 387) ; /* ~ 258us + 100us*delay */
frame_send_rwd(1 | (byte_index << 1), 9);
frame_send_rwd(1 | (byte_index << 1), cmd_sz);
frame_clean(&current_frame);
frame_receive_rwd(&current_frame, 12, 1);
byte = current_frame.data & 0xff;
if( LegicCRC(byte_index, byte) != (current_frame.data >> 8) )
Dbprintf("!!! crc mismatch: expected %x but got %x !!!", LegicCRC(byte_index, current_frame.data & 0xff), current_frame.data >> 8);
if( LegicCRC(byte_index, byte, cmd_sz) != (current_frame.data >> 8) ) {
Dbprintf("!!! crc mismatch: expected %x but got %x !!!", LegicCRC(byte_index, current_frame.data & 0xff, cmd_sz), current_frame.data >> 8);
return -1;
}
return byte;
}
@ -256,19 +256,51 @@ int legic_read_byte(int byte_index) {
void LegicRfReader(int offset, int bytes) {
int byte_index=0;
int byte_index=0, cmd_sz=0, card_sz=0;
LegicCommonInit();
memset(BigBuf, 0, 256);
memset(BigBuf, 0, 1024);
DbpString("setting up legic card");
uint32_t tag_type = perform_setup_phase_rwd(0x55);
switch(tag_type) {
case 0x1d:
DbpString("MIM 256 card found, reading card ...");
cmd_sz = 9;
card_sz = 256;
break;
case 0x3d:
DbpString("MIM 1024 card found, reading card ...");
cmd_sz = 11;
card_sz = 1024;
break;
default:
Dbprintf("No or unknown card found, aborting");
switch_off_tag_rwd();
return;
}
if(bytes == -1) {
bytes = card_sz;
}
if(bytes+offset >= card_sz) {
bytes = card_sz-offset;
}
switch_off_tag_rwd(); //we lost to mutch time with dprintf
perform_setup_phase_rwd(0x55);
while(byte_index < bytes) {
((uint8_t*)BigBuf)[byte_index] = legic_read_byte(byte_index+offset);
int r = legic_read_byte(byte_index+offset, cmd_sz);
if(r == -1) {
Dbprintf("aborting");
switch_off_tag_rwd();
return;
}
((uint8_t*)BigBuf)[byte_index] = r;
byte_index++;
}
switch_off_tag_rwd();
Dbprintf("Card read, use 'data hexsamples %d' to view results", (bytes+7) & ~7);
}

4
client/cmdhflegic.c
View file

@ -209,8 +209,8 @@ int CmdLegicRFRead(const char *Cmd)
{
int byte_count=0,offset=0;
sscanf(Cmd, "%i %i", &offset, &byte_count);
if(byte_count == 0) byte_count = 256;
if(byte_count + offset > 256) byte_count = 256 - offset;
if(byte_count == 0) byte_count = -1;
if(byte_count + offset > 1024) byte_count = 1024 - offset;
UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
SendCommand(&c);
return 0;