Revision 6fbe093f
Implemented code for new RFID readers
It's not fully working yet. When the checksum is enabled, it ignores all
responses. Also, it no longer recognizes a missing card.
| toolbox/rfid.c | ||
|---|---|---|
| 4 | 4 |
#include "rfid.h" |
| 5 | 5 |
#include "serial.h" |
| 6 | 6 |
|
| 7 |
#define RFID_OK 1 |
|
| 8 |
static uint8_t read_cmd[] = {'!', 'R', 'W', 1, 32};
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|
| 7 |
static uint8_t seek_cmd[] = {0xFF, 0x00, 0x01, 0x82, 0x83};
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|
| 8 |
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| 9 |
#define FRAME_SIZE(data_size) ((data_size)+4) |
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| 10 |
#define MAX_FRAME_SIZE FRAME_SIZE(RFID_SERNO_SIZE+2) |
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| 11 |
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| 12 |
#define RESP_START 0 |
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| 13 |
#define RESP_RESERVED 1 |
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| 14 |
#define RESP_LENGTH 2 |
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| 15 |
#define RESP_CMD 3 |
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| 16 |
#define RESP_DATA 4 |
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| 17 |
static uint8_t response[MAX_FRAME_SIZE]; |
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| 18 |
static uint8_t resp_idx; |
|
| 9 | 19 |
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| 10 |
static int serno_idx; |
|
| 11 | 20 |
static uint8_t serno[RFID_SERNO_SIZE]; |
| 12 | 21 |
|
| 13 | 22 |
static void zero_serno() {
|
| ... | ... | |
| 22 | 31 |
} |
| 23 | 32 |
|
| 24 | 33 |
void rfid_start_read() {
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| 25 |
serno_idx = -1;
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| 34 |
resp_idx = 0;
|
|
| 26 | 35 |
serial_flush(); |
| 27 |
serial_write(read_cmd, sizeof(read_cmd)); |
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| 36 |
serial_write(seek_cmd, sizeof(seek_cmd)); |
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| 37 |
} |
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| 38 |
|
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| 39 |
char parse_response() {
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| 40 |
uint8_t sum; |
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| 41 |
int resp_csum, i; |
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| 42 |
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| 43 |
if (response[RESP_LENGTH] != RFID_SERNO_SIZE+2 |
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| 44 |
|| response[RESP_CMD] != 0x82) {
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| 45 |
zero_serno(); |
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| 46 |
return 0; |
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| 47 |
} |
|
| 48 |
|
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| 49 |
resp_csum = response[RESP_LENGTH] + RESP_CMD; |
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| 50 |
sum = 0; |
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| 51 |
for (i = RESP_LENGTH; i < resp_csum; i++) {
|
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| 52 |
sum += response[i]; |
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| 53 |
} |
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if (response[resp_csum] != sum) {
|
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| 55 |
//return 0; TODO |
|
| 56 |
} |
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| 57 |
|
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memcpy(serno, &response[RESP_DATA+1], RFID_SERNO_SIZE); |
|
| 59 |
return 1; |
|
| 28 | 60 |
} |
| 29 | 61 |
|
| 30 | 62 |
char rfid_poll() {
|
| ... | ... | |
| 32 | 64 |
|
| 33 | 65 |
while ((c = serial_read()) >= 0) {
|
| 34 | 66 |
|
| 35 |
if (serno_idx < 0) {
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| 36 |
if (c != RFID_OK) {
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| 37 |
zero_serno(); |
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| 38 |
return 1; |
|
| 39 |
} |
|
| 40 |
} else {
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serno[serno_idx] = c; |
|
| 67 |
if (resp_idx < sizeof(response)) {
|
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| 68 |
response[resp_idx] = c; |
|
| 42 | 69 |
} |
| 70 |
resp_idx++; |
|
| 43 | 71 |
|
| 44 |
serno_idx++; |
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| 45 |
if (serno_idx >= RFID_SERNO_SIZE) {
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| 46 |
return 1; |
|
| 47 |
} |
|
| 72 |
if (resp_idx == 1) {
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| 73 |
|
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| 74 |
// restart if the frame start is invalid |
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if (response[RESP_START] != 0xFF) {
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resp_idx = 0; |
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} |
|
| 48 | 78 |
|
| 79 |
} else if (resp_idx > RESP_LENGTH) {
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| 80 |
|
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| 81 |
// check if we're done with current packet |
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| 82 |
if (resp_idx >= FRAME_SIZE(response[RESP_LENGTH])) {
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| 83 |
resp_idx = 0; |
|
| 84 |
serial_write(seek_cmd, sizeof(seek_cmd)); |
|
| 85 |
if (parse_response()) {
|
|
| 86 |
return 1; |
|
| 87 |
} |
|
| 88 |
} |
|
| 89 |
|
|
| 90 |
} |
|
| 49 | 91 |
} |
| 50 | 92 |
|
| 51 | 93 |
return 0; |
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