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add helper fct manchesterEncodeUint32

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This commit is contained in:
Philippe Teuwen 2019-09-15 02:09:40 +02:00
commit 960d8c4db3
3 changed files with 20 additions and 57 deletions
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64
armsrc/lfops.c
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@ -917,8 +917,10 @@ void CmdHIDsimTAGEx(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT, boo
bit 0 = fc8
*/
// special start of frame marker containing invalid Manchester bit sequences
uint8_t bits[8+8*2+84*2] = { 0, 0, 0, 1, 1, 1, 0, 1 };
uint8_t bitlen = 0;
uint16_t n = 8;
if (longFMT) {
// Ensure no more than 84 bits supplied
@ -927,71 +929,19 @@ void CmdHIDsimTAGEx(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT, boo
return;
}
bitlen = 8+8*2+84*2;
// special start of frame marker containing invalid Manchester bit sequences
uint16_t n = 8;
hi2 |= 0x9E00000; // 9E: long format identifier
// manchester encode "9E" and bits 83 to 64
for (int i = 27; i >= 0; i--) {
if ((hi2 >> i) & 1) {
bits[n++] = 1;
bits[n++] = 0;
} else {
bits[n++] = 0;
bits[n++] = 1;
}
}
// manchester encode bits 63 to 32
for (int i = 31; i >= 0; i--) {
if ((hi >> i) & 1) {
bits[n++] = 1;
bits[n++] = 0;
} else {
bits[n++] = 0;
bits[n++] = 1;
}
}
// manchester encode bits 31 to 0
for (int i = 31; i >= 0; i--) {
if ((lo >> i) & 1) {
bits[n++] = 1;
bits[n++] = 0;
} else {
bits[n++] = 0;
bits[n++] = 1;
}
}
manchesterEncodeUint32(hi2, 16+12, bits, &n);
manchesterEncodeUint32(hi, 32, bits, &n);
manchesterEncodeUint32(lo, 32, bits, &n);
} else {
if (hi > 0xFFF) {
DbpString("[!] tags can only have 44 bits. - USE lf simfsk for larger tags");
return;
}
bitlen = 8+44*2;
// special start of frame marker containing invalid Manchester bit sequences
uint16_t n = 8;
// manchester encode bits 43 to 32
for (int i = 11; i >= 0; i--) {
if ((hi >> i) & 1) {
bits[n++] = 1;
bits[n++] = 0;
} else {
bits[n++] = 0;
bits[n++] = 1;
}
}
// manchester encode bits 31 to 0
for (int i = 31; i >= 0; i--) {
if ((lo >> i) & 1) {
bits[n++] = 1;
bits[n++] = 0;
} else {
bits[n++] = 0;
bits[n++] = 1;
}
}
manchesterEncodeUint32(hi, 12, bits, &n);
manchesterEncodeUint32(lo, 32, bits, &n);
}
CmdFSKsimTAGEx(10, 8, 0, 50, bitlen, bits, ledcontrol, numcycles);
}