root / rfid.c @ 9b2b6d91
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#include <util/delay.h> |
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#include "rfid.h" |
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#include "serial.h" |
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static char read_cmd[] = {'!', 'R', 'W', 1, 32}; |
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static char serno[RFID_SERNO_SIZE]; |
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static void zero_serno() { |
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int i;
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for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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serno[i] = 0;
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} |
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} |
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static void read_serno() { |
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int i;
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for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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serno[i] = serial_read_blocking(); |
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} |
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} |
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static char check_serno() { |
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int i;
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for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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if (serno[i] != serial_read_blocking()) {
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return 0; |
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} |
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} |
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return 1; |
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} |
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void rfid_init() {
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serial_init(); |
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} |
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void rfid_read_safe() {
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char n_err = 0, n_ok = 0; |
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while (1) { |
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serial_write(read_cmd, sizeof(read_cmd));
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if (serial_read_blocking() == RFID_OK) {
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if (n_ok == 0) { |
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read_serno(); |
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} else if (!check_serno()) { |
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zero_serno(); |
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return;
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} |
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n_ok++; |
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if (n_ok >= RFID_MIN_OK) {
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return;
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} |
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} else {
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n_err++; |
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if (n_err >= RFID_MAX_ERRS) {
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zero_serno(); |
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return;
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} |
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} |
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_delay_ms(40);
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} |
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} |
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void rfid_read() {
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while (1) { |
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serial_write(read_cmd, sizeof(read_cmd));
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if (serial_read_blocking() == RFID_OK) {
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read_serno(); |
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return;
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} |
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_delay_ms(40);
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} |
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} |
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void rfid_get_serno(char *buf) { |
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int i;
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for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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buf[i] = serno[i]; |
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} |
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} |