root / toolbox / rfid.c @ 1085ef77
History | View | Annotate | Download (1.07 KB)
| 1 | 12ea39cc | Tom Mullins | #include <string.h> |
|---|---|---|---|
| 2 | 6ca98a3f | Tom Mullins | #include <stdint.h> |
| 3 | 9b2b6d91 | Tom Mullins | #include <util/delay.h> |
| 4 | #include "rfid.h" |
||
| 5 | #include "serial.h" |
||
| 6 | |||
| 7 | 1085ef77 | Tom Mullins | #define RFID_OK 1 |
| 8 | 6ca98a3f | Tom Mullins | static uint8_t read_cmd[] = {'!', 'R', 'W', 1, 32}; |
| 9 | 9b2b6d91 | Tom Mullins | |
| 10 | 532ba0bd | Tom Mullins | static int serno_idx; |
| 11 | 1085ef77 | Tom Mullins | static char n_failures; |
| 12 | 6ca98a3f | Tom Mullins | static uint8_t serno[RFID_SERNO_SIZE];
|
| 13 | 9b2b6d91 | Tom Mullins | |
| 14 | static void zero_serno() { |
||
| 15 | int i;
|
||
| 16 | for (i = 0; i < RFID_SERNO_SIZE; i++) { |
||
| 17 | serno[i] = 0;
|
||
| 18 | } |
||
| 19 | } |
||
| 20 | |||
| 21 | void rfid_init() {
|
||
| 22 | serial_init(); |
||
| 23 | } |
||
| 24 | |||
| 25 | 1085ef77 | Tom Mullins | static void restart_read() { |
| 26 | 532ba0bd | Tom Mullins | serno_idx = -1;
|
| 27 | serial_write(read_cmd, sizeof(read_cmd));
|
||
| 28 | } |
||
| 29 | |||
| 30 | 1085ef77 | Tom Mullins | void rfid_start_read() {
|
| 31 | n_failures = 0;
|
||
| 32 | restart_read(); |
||
| 33 | } |
||
| 34 | |||
| 35 | 532ba0bd | Tom Mullins | char rfid_poll() {
|
| 36 | int c;
|
||
| 37 | |||
| 38 | 6ca98a3f | Tom Mullins | while ((c = serial_read()) >= 0) { |
| 39 | 532ba0bd | Tom Mullins | |
| 40 | if (serno_idx < 0) { |
||
| 41 | if (c != RFID_OK) {
|
||
| 42 | 1085ef77 | Tom Mullins | n_failures++; |
| 43 | if (n_failures >= RFID_N_FAILURES) {
|
||
| 44 | zero_serno(); |
||
| 45 | return 1; |
||
| 46 | } else {
|
||
| 47 | restart_read(); |
||
| 48 | return 0; |
||
| 49 | } |
||
| 50 | 532ba0bd | Tom Mullins | } |
| 51 | } else {
|
||
| 52 | serno[serno_idx] = c; |
||
| 53 | } |
||
| 54 | |||
| 55 | serno_idx++; |
||
| 56 | if (serno_idx >= RFID_SERNO_SIZE) {
|
||
| 57 | return 1; |
||
| 58 | 9b2b6d91 | Tom Mullins | } |
| 59 | 532ba0bd | Tom Mullins | |
| 60 | 9b2b6d91 | Tom Mullins | } |
| 61 | 532ba0bd | Tom Mullins | |
| 62 | return 0; |
||
| 63 | 9b2b6d91 | Tom Mullins | } |
| 64 | |||
| 65 | 6ca98a3f | Tom Mullins | void rfid_get_serno(uint8_t *buf) {
|
| 66 | 12ea39cc | Tom Mullins | memcpy(buf, serno, sizeof(serno));
|
| 67 | } |