NFC library using PN532 to read/write NDEF Messages to NFC tags
Dependents: Seeed_NFC_Shield_write Nucleo_test_nfc
Fork of PN532 by
snep.cpp@6:26c1b3b6c192, 2014-03-25 (annotated)
- Committer:
- screamer
- Date:
- Tue Mar 25 16:48:10 2014 +0000
- Revision:
- 6:26c1b3b6c192
- Parent:
- 3:4189a10038e6
Fixed compile warnings
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
yihui | 3:4189a10038e6 | 1 | |
yihui | 3:4189a10038e6 | 2 | #include "snep.h" |
yihui | 3:4189a10038e6 | 3 | #include "PN532_debug.h" |
yihui | 3:4189a10038e6 | 4 | |
yihui | 3:4189a10038e6 | 5 | int8_t SNEP::write(const uint8_t *buf, uint8_t len, uint16_t timeout) |
yihui | 3:4189a10038e6 | 6 | { |
yihui | 3:4189a10038e6 | 7 | if (0 >= llcp.activate(timeout)) { |
yihui | 3:4189a10038e6 | 8 | DMSG("failed to activate PN532 as a target\n"); |
yihui | 3:4189a10038e6 | 9 | return -1; |
yihui | 3:4189a10038e6 | 10 | } |
yihui | 3:4189a10038e6 | 11 | |
yihui | 3:4189a10038e6 | 12 | if (0 >= llcp.connect(timeout)) { |
yihui | 3:4189a10038e6 | 13 | DMSG("failed to set up a connection\n"); |
yihui | 3:4189a10038e6 | 14 | return -2; |
yihui | 3:4189a10038e6 | 15 | } |
yihui | 3:4189a10038e6 | 16 | |
yihui | 3:4189a10038e6 | 17 | // response a success SNEP message |
yihui | 3:4189a10038e6 | 18 | headerBuf[0] = SNEP_DEFAULT_VERSION; |
yihui | 3:4189a10038e6 | 19 | headerBuf[1] = SNEP_REQUEST_PUT; |
yihui | 3:4189a10038e6 | 20 | headerBuf[2] = 0; |
yihui | 3:4189a10038e6 | 21 | headerBuf[3] = 0; |
yihui | 3:4189a10038e6 | 22 | headerBuf[4] = 0; |
yihui | 3:4189a10038e6 | 23 | headerBuf[5] = len; |
yihui | 3:4189a10038e6 | 24 | if (0 >= llcp.write(headerBuf, 6, buf, len)) { |
yihui | 3:4189a10038e6 | 25 | return -3; |
yihui | 3:4189a10038e6 | 26 | } |
yihui | 3:4189a10038e6 | 27 | |
yihui | 3:4189a10038e6 | 28 | uint8_t rbuf[16]; |
yihui | 3:4189a10038e6 | 29 | if (6 > llcp.read(rbuf, sizeof(rbuf))) { |
yihui | 3:4189a10038e6 | 30 | return -4; |
yihui | 3:4189a10038e6 | 31 | } |
yihui | 3:4189a10038e6 | 32 | |
yihui | 3:4189a10038e6 | 33 | // check SNEP version |
yihui | 3:4189a10038e6 | 34 | if (SNEP_DEFAULT_VERSION != rbuf[0]) { |
yihui | 3:4189a10038e6 | 35 | DMSG("The received SNEP message's major version is different\n"); |
yihui | 3:4189a10038e6 | 36 | // To-do: send Unsupported Version response |
yihui | 3:4189a10038e6 | 37 | return -4; |
yihui | 3:4189a10038e6 | 38 | } |
yihui | 3:4189a10038e6 | 39 | |
yihui | 3:4189a10038e6 | 40 | // expect a put request |
yihui | 3:4189a10038e6 | 41 | if (SNEP_RESPONSE_SUCCESS != rbuf[1]) { |
yihui | 3:4189a10038e6 | 42 | DMSG("Expect a success response\n"); |
yihui | 3:4189a10038e6 | 43 | return -4; |
yihui | 3:4189a10038e6 | 44 | } |
yihui | 3:4189a10038e6 | 45 | |
yihui | 3:4189a10038e6 | 46 | llcp.disconnect(timeout); |
yihui | 3:4189a10038e6 | 47 | |
yihui | 3:4189a10038e6 | 48 | return 1; |
yihui | 3:4189a10038e6 | 49 | } |
yihui | 3:4189a10038e6 | 50 | |
yihui | 3:4189a10038e6 | 51 | int16_t SNEP::read(uint8_t *buf, uint8_t len, uint16_t timeout) |
yihui | 3:4189a10038e6 | 52 | { |
yihui | 3:4189a10038e6 | 53 | if (0 >= llcp.activate(timeout)) { |
yihui | 3:4189a10038e6 | 54 | DMSG("failed to activate PN532 as a target\n"); |
yihui | 3:4189a10038e6 | 55 | return -1; |
yihui | 3:4189a10038e6 | 56 | } |
yihui | 3:4189a10038e6 | 57 | |
yihui | 3:4189a10038e6 | 58 | if (0 >= llcp.waitForConnection(timeout)) { |
yihui | 3:4189a10038e6 | 59 | DMSG("failed to set up a connection\n"); |
yihui | 3:4189a10038e6 | 60 | return -2; |
yihui | 3:4189a10038e6 | 61 | } |
yihui | 3:4189a10038e6 | 62 | |
yihui | 3:4189a10038e6 | 63 | uint16_t status = llcp.read(buf, len); |
yihui | 3:4189a10038e6 | 64 | if (6 > status) { |
yihui | 3:4189a10038e6 | 65 | return -3; |
yihui | 3:4189a10038e6 | 66 | } |
yihui | 3:4189a10038e6 | 67 | |
yihui | 3:4189a10038e6 | 68 | |
yihui | 3:4189a10038e6 | 69 | // check SNEP version |
yihui | 3:4189a10038e6 | 70 | if (SNEP_DEFAULT_VERSION != buf[0]) { |
yihui | 3:4189a10038e6 | 71 | DMSG("The received SNEP message's major version is different\n"); |
yihui | 3:4189a10038e6 | 72 | // To-do: send Unsupported Version response |
yihui | 3:4189a10038e6 | 73 | return -4; |
yihui | 3:4189a10038e6 | 74 | } |
yihui | 3:4189a10038e6 | 75 | |
yihui | 3:4189a10038e6 | 76 | // expect a put request |
yihui | 3:4189a10038e6 | 77 | if (SNEP_REQUEST_PUT != buf[1]) { |
yihui | 3:4189a10038e6 | 78 | DMSG("Expect a put request\n"); |
yihui | 3:4189a10038e6 | 79 | return -4; |
yihui | 3:4189a10038e6 | 80 | } |
yihui | 3:4189a10038e6 | 81 | |
yihui | 3:4189a10038e6 | 82 | // check message's length |
yihui | 3:4189a10038e6 | 83 | uint32_t length = (buf[2] << 24) + (buf[3] << 16) + (buf[4] << 8) + buf[5]; |
yihui | 3:4189a10038e6 | 84 | // length should not be more than 244 (header + body < 255, header = 6 + 3 + 2) |
yihui | 3:4189a10038e6 | 85 | if (length > (status - 6)) { |
yihui | 3:4189a10038e6 | 86 | DMSG("The SNEP message is too large: "); |
yihui | 3:4189a10038e6 | 87 | DMSG_INT(length); |
yihui | 3:4189a10038e6 | 88 | DMSG_INT(status - 6); |
yihui | 3:4189a10038e6 | 89 | DMSG("\n"); |
yihui | 3:4189a10038e6 | 90 | return -4; |
yihui | 3:4189a10038e6 | 91 | } |
yihui | 3:4189a10038e6 | 92 | for (uint8_t i = 0; i < length; i++) { |
yihui | 3:4189a10038e6 | 93 | buf[i] = buf[i + 6]; |
yihui | 3:4189a10038e6 | 94 | } |
yihui | 3:4189a10038e6 | 95 | |
yihui | 3:4189a10038e6 | 96 | // response a success SNEP message |
yihui | 3:4189a10038e6 | 97 | headerBuf[0] = SNEP_DEFAULT_VERSION; |
yihui | 3:4189a10038e6 | 98 | headerBuf[1] = SNEP_RESPONSE_SUCCESS; |
yihui | 3:4189a10038e6 | 99 | headerBuf[2] = 0; |
yihui | 3:4189a10038e6 | 100 | headerBuf[3] = 0; |
yihui | 3:4189a10038e6 | 101 | headerBuf[4] = 0; |
yihui | 3:4189a10038e6 | 102 | headerBuf[5] = 0; |
yihui | 3:4189a10038e6 | 103 | llcp.write(headerBuf, 6); |
yihui | 3:4189a10038e6 | 104 | |
yihui | 3:4189a10038e6 | 105 | return length; |
yihui | 3:4189a10038e6 | 106 | } |