root / rfid.c @ 9b2b6d91
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| 1 | 9b2b6d91 | Tom Mullins | #include <util/delay.h> |
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| 2 | #include "rfid.h" |
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| 3 | #include "serial.h" |
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| 4 | |||
| 5 | static char read_cmd[] = {'!', 'R', 'W', 1, 32}; |
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| 6 | |||
| 7 | static char serno[RFID_SERNO_SIZE]; |
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| 8 | |||
| 9 | static void zero_serno() { |
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| 10 | int i;
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| 11 | for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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| 12 | serno[i] = 0;
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| 13 | } |
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| 14 | } |
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| 15 | |||
| 16 | static void read_serno() { |
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| 17 | int i;
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| 18 | for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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| 19 | serno[i] = serial_read_blocking(); |
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| 20 | } |
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| 21 | } |
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| 22 | |||
| 23 | static char check_serno() { |
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| 24 | int i;
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| 25 | for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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| 26 | if (serno[i] != serial_read_blocking()) {
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| 27 | return 0; |
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| 28 | } |
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| 29 | } |
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| 30 | return 1; |
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| 31 | } |
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| 32 | |||
| 33 | void rfid_init() {
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| 34 | serial_init(); |
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| 35 | } |
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| 36 | |||
| 37 | void rfid_read_safe() {
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| 38 | char n_err = 0, n_ok = 0; |
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| 39 | while (1) { |
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| 40 | serial_write(read_cmd, sizeof(read_cmd));
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| 41 | if (serial_read_blocking() == RFID_OK) {
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| 42 | if (n_ok == 0) { |
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| 43 | read_serno(); |
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| 44 | } else if (!check_serno()) { |
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| 45 | zero_serno(); |
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| 46 | return;
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| 47 | } |
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| 48 | n_ok++; |
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| 49 | if (n_ok >= RFID_MIN_OK) {
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| 50 | return;
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| 51 | } |
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| 52 | } else {
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| 53 | n_err++; |
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| 54 | if (n_err >= RFID_MAX_ERRS) {
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| 55 | zero_serno(); |
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| 56 | return;
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| 57 | } |
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| 58 | } |
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| 59 | _delay_ms(40);
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| 60 | } |
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| 61 | } |
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| 62 | |||
| 63 | void rfid_read() {
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| 64 | while (1) { |
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| 65 | serial_write(read_cmd, sizeof(read_cmd));
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| 66 | if (serial_read_blocking() == RFID_OK) {
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| 67 | read_serno(); |
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| 68 | return;
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| 69 | } |
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| 70 | _delay_ms(40);
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| 71 | } |
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| 72 | } |
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| 73 | |||
| 74 | void rfid_get_serno(char *buf) { |
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| 75 | int i;
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| 76 | for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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| 77 | buf[i] = serno[i]; |
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| 78 | } |
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| 79 | } |