root / toolbox / rfid.c @ bbf2f5ad
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| 1 | 12ea39cc | Tom Mullins | #include <string.h> |
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| 2 | 6ca98a3f | Tom Mullins | #include <stdint.h> |
| 3 | 9b2b6d91 | Tom Mullins | #include <util/delay.h> |
| 4 | #include "rfid.h" |
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| 5 | #include "serial.h" |
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| 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 | 6ca98a3f | Tom Mullins | static uint8_t serno[RFID_SERNO_SIZE];
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| 12 | 9b2b6d91 | Tom Mullins | |
| 13 | static void zero_serno() { |
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| 14 | int i;
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| 15 | for (i = 0; i < RFID_SERNO_SIZE; i++) { |
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| 16 | serno[i] = 0;
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| 17 | } |
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| 18 | } |
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| 19 | |||
| 20 | void rfid_init() {
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| 21 | serial_init(); |
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| 22 | } |
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| 23 | |||
| 24 | bbf2f5ad | Tom Mullins | void rfid_start_read() {
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| 25 | 532ba0bd | Tom Mullins | serno_idx = -1;
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| 26 | bbf2f5ad | Tom Mullins | serial_flush(); |
| 27 | 532ba0bd | Tom Mullins | serial_write(read_cmd, sizeof(read_cmd));
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| 28 | } |
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| 29 | |||
| 30 | char rfid_poll() {
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| 31 | int c;
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| 32 | |||
| 33 | 6ca98a3f | Tom Mullins | while ((c = serial_read()) >= 0) { |
| 34 | 532ba0bd | Tom Mullins | |
| 35 | if (serno_idx < 0) { |
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| 36 | if (c != RFID_OK) {
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| 37 | bbf2f5ad | Tom Mullins | zero_serno(); |
| 38 | return 1; |
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| 39 | 532ba0bd | Tom Mullins | } |
| 40 | } else {
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| 41 | serno[serno_idx] = c; |
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| 42 | } |
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| 43 | |||
| 44 | serno_idx++; |
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| 45 | if (serno_idx >= RFID_SERNO_SIZE) {
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| 46 | return 1; |
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| 47 | 9b2b6d91 | Tom Mullins | } |
| 48 | 532ba0bd | Tom Mullins | |
| 49 | 9b2b6d91 | Tom Mullins | } |
| 50 | 532ba0bd | Tom Mullins | |
| 51 | return 0; |
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| 52 | 9b2b6d91 | Tom Mullins | } |
| 53 | |||
| 54 | 6ca98a3f | Tom Mullins | void rfid_get_serno(uint8_t *buf) {
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| 55 | 12ea39cc | Tom Mullins | memcpy(buf, serno, sizeof(serno));
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| 56 | } |