RfidResearchGroup/proxmark3
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simplified functions for byte sending

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tharexde 2020-06-17 23:06:57 +02:00
parent 89f15432b0
commit 5cb732d620
1 changed files with 9 additions and 25 deletions
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34
armsrc/em4x50.c
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@ -341,39 +341,23 @@ static void em4x50_send_byte(uint8_t byte) {
// send byte (without parity)
int mask = 0x80;
for (int i = 0; i < 8; i++)
em4x50_send_bit((byte >> (7-i)) & 1);
for (int i = 0; i < 8; i++) {
if ((byte & mask) == 0)
em4x50_send_bit(0);
else
em4x50_send_bit(1);
mask >>= 1;
}
}
static void em4x50_send_byte_with_parity(uint8_t byte) {
// send byte followed by its (equal) parity bit
int parity = 0;
int mask = 0x80;
for (int i = 0; i < 8; i++) {
if ((byte & mask) == 0) {
em4x50_send_bit(0);
parity ^= 0;
} else {
em4x50_send_bit(1);
parity ^= 1;
}
mask >>= 1;
}
int parity = 0, bit = 0;
for (int i = 0; i < 8; i++) {
bit = (byte >> (7-i)) & 1;
em4x50_send_bit(bit);
parity ^= bit;
}
em4x50_send_bit(parity);
}