root / toolbox / rfid.c @ 6ca98a3f
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#include <string.h> |
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#include <stdint.h> |
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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 uint8_t read_cmd[] = {'!', 'R', 'W', 1, 32}; |
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static int serno_idx; |
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static uint8_t 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(10);
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} |
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} |
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void rfid_start_read() {
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serno_idx = -1;
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zero_serno(); // TODO temporary
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serial_flush(); |
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serial_write(read_cmd, sizeof(read_cmd));
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} |
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char rfid_poll() {
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int c;
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while ((c = serial_read()) >= 0) { |
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if (serno_idx < 0) { |
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if (c != RFID_OK) {
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zero_serno(); |
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return 1; |
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} |
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} else {
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serno[serno_idx] = c; |
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} |
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serno_idx++; |
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if (serno_idx >= RFID_SERNO_SIZE) {
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return 1; |
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} |
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} |
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return 0; |
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} |
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void rfid_get_serno(uint8_t *buf) {
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memcpy(buf, serno, sizeof(serno));
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} |
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char rfid_check_serno(uint8_t *buf) {
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return memcmp(buf, serno, sizeof(serno)) == 0; |
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} |
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char rfid_nonzero() {
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int i;
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for (i = 0; i < sizeof(serno); i++) { |
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if (serno[i]) {
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return 1; |
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} |
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} |
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return 0; |
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} |