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Legic: Implemented read command for card simulation

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AntiCat 2018-09-05 22:46:21 +02:00
commit 324223c4f5
1 changed files with 26 additions and 2 deletions
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26
armsrc/legicrfsim.c
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@ -367,9 +367,33 @@ static int32_t setup_phase(legic_card_select_t *p_card) {
return 0;
}
// TODO Commands are left as an exercise to the reader
static uint8_t calc_crc4(uint16_t cmd, uint8_t cmd_sz, uint8_t value) {
crc_clear(&legic_crc);
crc_update(&legic_crc, (value << cmd_sz) | cmd, 8 + cmd_sz);
return crc_finish(&legic_crc);
}
static int32_t connected_phase(legic_card_select_t *p_card) {
uint8_t len = 0;
// wait for command
int32_t cmd = rx_frame(&len);
if(cmd < 0) {
return -1;
}
// check if command is LEGIC_READ
if(len == p_card->cmdsize) {
// prepare data
uint8_t byte = legic_mem[cmd >> 1];
uint8_t crc = calc_crc4(cmd, p_card->cmdsize, byte);
// transmit data
tx_frame((crc << 8) | byte, 12);
return 0;
}
return -1;
}
//-----------------------------------------------------------------------------