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PN532_SPI.cpp@1:a549ef8b142a, 2015-04-24 (annotated)

Committer:
mauroar211
Date:
Fri Apr 24 19:02:44 2015 +0000
Revision:
1:a549ef8b142a
Parent:
0:b805b487fbef 
SE RESTAURARON LOS ARCHIVO DE LA LIBRER?A;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mauroar211 0:b805b487fbef 1
mauroar211 0:b805b487fbef 2 #include "PN532_SPI.h"
mauroar211 0:b805b487fbef 3 #include "PN532_debug.h"
mauroar211 1:a549ef8b142a 4 #include "mbed.h"
mauroar211 0:b805b487fbef 5
mauroar211 0:b805b487fbef 6 #define STATUS_READ 2
mauroar211 0:b805b487fbef 7 #define DATA_WRITE 1
mauroar211 0:b805b487fbef 8 #define DATA_READ 3
mauroar211 0:b805b487fbef 9
mauroar211 0:b805b487fbef 10 PN532_SPI::PN532_SPI(SPI &spi, PinName ss) : _ss(ss)
mauroar211 0:b805b487fbef 11 {
mauroar211 0:b805b487fbef 12 command = 0;
mauroar211 0:b805b487fbef 13 _spi = &spi;
mauroar211 0:b805b487fbef 14 _spi->format(8, 0);
mauroar211 0:b805b487fbef 15 _spi->frequency(2000000);
mauroar211 0:b805b487fbef 16
mauroar211 0:b805b487fbef 17 _ss = 1;
mauroar211 1:a549ef8b142a 18 }/*
mauroar211 0:b805b487fbef 19 PN532_SPI::PN532_SPI(SPI *spi, PinName ss) : _ss(ss)
mauroar211 0:b805b487fbef 20 {
mauroar211 0:b805b487fbef 21 command = 0;
mauroar211 0:b805b487fbef 22 _spi = spi;
mauroar211 0:b805b487fbef 23 _spi->format(8, 0);
mauroar211 0:b805b487fbef 24 _spi->frequency(2000000);
mauroar211 0:b805b487fbef 25
mauroar211 0:b805b487fbef 26 _ss = 1;
mauroar211 1:a549ef8b142a 27 }*/
mauroar211 0:b805b487fbef 28 void PN532_SPI::begin()
mauroar211 0:b805b487fbef 29 {
mauroar211 0:b805b487fbef 30
mauroar211 0:b805b487fbef 31 }
mauroar211 0:b805b487fbef 32
mauroar211 0:b805b487fbef 33 void PN532_SPI::wakeup()
mauroar211 0:b805b487fbef 34 {
mauroar211 0:b805b487fbef 35 _ss = 0;
mauroar211 0:b805b487fbef 36 wait_ms(2);
mauroar211 0:b805b487fbef 37 _ss = 1;
mauroar211 0:b805b487fbef 38 }
mauroar211 0:b805b487fbef 39
mauroar211 0:b805b487fbef 40 int8_t PN532_SPI::writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
mauroar211 0:b805b487fbef 41 {
mauroar211 0:b805b487fbef 42 command = header[0];
mauroar211 0:b805b487fbef 43 writeFrame(header, hlen, body, blen);
mauroar211 0:b805b487fbef 44
mauroar211 0:b805b487fbef 45 uint8_t timeout = PN532_ACK_WAIT_TIME;
mauroar211 0:b805b487fbef 46 while (!isReady()) {
mauroar211 0:b805b487fbef 47 wait_ms(1);
mauroar211 0:b805b487fbef 48 timeout--;
mauroar211 0:b805b487fbef 49 if (0 == timeout) {
mauroar211 0:b805b487fbef 50 DMSG("Time out when waiting for ACK\n");
mauroar211 0:b805b487fbef 51 return -2;
mauroar211 0:b805b487fbef 52 }
mauroar211 0:b805b487fbef 53 }
mauroar211 0:b805b487fbef 54 if (readAckFrame()) {
mauroar211 0:b805b487fbef 55 DMSG("Invalid ACK\n");
mauroar211 0:b805b487fbef 56 return PN532_INVALID_ACK;
mauroar211 0:b805b487fbef 57 }
mauroar211 0:b805b487fbef 58 return 0;
mauroar211 0:b805b487fbef 59 }
mauroar211 0:b805b487fbef 60
mauroar211 0:b805b487fbef 61 int16_t PN532_SPI::readResponse(uint8_t buf[], uint8_t len, uint16_t timeout)
mauroar211 0:b805b487fbef 62 {
mauroar211 0:b805b487fbef 63 uint16_t time = 0;
mauroar211 0:b805b487fbef 64 while (!isReady()) {
mauroar211 0:b805b487fbef 65 wait_ms(1);
mauroar211 0:b805b487fbef 66 time++;
mauroar211 0:b805b487fbef 67 if (timeout > 0 && time > timeout) {
mauroar211 0:b805b487fbef 68 return PN532_TIMEOUT;
mauroar211 0:b805b487fbef 69 }
mauroar211 0:b805b487fbef 70 }
mauroar211 0:b805b487fbef 71
mauroar211 0:b805b487fbef 72 _ss = 0;
mauroar211 0:b805b487fbef 73 wait_ms(1);
mauroar211 0:b805b487fbef 74
mauroar211 0:b805b487fbef 75 int16_t result;
mauroar211 0:b805b487fbef 76 do {
mauroar211 0:b805b487fbef 77 write(DATA_READ);
mauroar211 0:b805b487fbef 78
mauroar211 0:b805b487fbef 79 if (0x00 != read() || // PREAMBLE
mauroar211 0:b805b487fbef 80 0x00 != read() || // STARTCODE1
mauroar211 0:b805b487fbef 81 0xFF != read() // STARTCODE2
mauroar211 0:b805b487fbef 82 ) {
mauroar211 0:b805b487fbef 83
mauroar211 0:b805b487fbef 84 result = PN532_INVALID_FRAME;
mauroar211 0:b805b487fbef 85 break;
mauroar211 0:b805b487fbef 86 }
mauroar211 0:b805b487fbef 87
mauroar211 0:b805b487fbef 88 uint8_t length = read();
mauroar211 0:b805b487fbef 89 if (0 != (uint8_t)(length + read())) { // checksum of length
mauroar211 0:b805b487fbef 90 result = PN532_INVALID_FRAME;
mauroar211 0:b805b487fbef 91 break;
mauroar211 0:b805b487fbef 92 }
mauroar211 0:b805b487fbef 93
mauroar211 0:b805b487fbef 94 uint8_t cmd = command + 1; // response command
mauroar211 0:b805b487fbef 95 if (PN532_PN532TOHOST != read() || (cmd) != read()) {
mauroar211 0:b805b487fbef 96 result = PN532_INVALID_FRAME;
mauroar211 0:b805b487fbef 97 break;
mauroar211 0:b805b487fbef 98 }
mauroar211 0:b805b487fbef 99
mauroar211 0:b805b487fbef 100 DMSG("read: ");
mauroar211 0:b805b487fbef 101 DMSG_HEX(cmd);
mauroar211 0:b805b487fbef 102
mauroar211 0:b805b487fbef 103 length -= 2;
mauroar211 0:b805b487fbef 104 if (length > len) {
mauroar211 0:b805b487fbef 105 for (uint8_t i = 0; i < length; i++) {
mauroar211 0:b805b487fbef 106 DMSG_HEX(read()); // dump message
mauroar211 0:b805b487fbef 107 }
mauroar211 0:b805b487fbef 108 DMSG("\nNot enough space\n");
mauroar211 0:b805b487fbef 109 read();
mauroar211 0:b805b487fbef 110 read();
mauroar211 0:b805b487fbef 111 result = PN532_NO_SPACE; // not enough space
mauroar211 0:b805b487fbef 112 break;
mauroar211 0:b805b487fbef 113 }
mauroar211 0:b805b487fbef 114
mauroar211 0:b805b487fbef 115 uint8_t sum = PN532_PN532TOHOST + cmd;
mauroar211 0:b805b487fbef 116 for (uint8_t i = 0; i < length; i++) {
mauroar211 0:b805b487fbef 117 buf[i] = read();
mauroar211 0:b805b487fbef 118 sum += buf[i];
mauroar211 0:b805b487fbef 119
mauroar211 0:b805b487fbef 120 DMSG_HEX(buf[i]);
mauroar211 0:b805b487fbef 121 }
mauroar211 0:b805b487fbef 122 DMSG("\n");
mauroar211 0:b805b487fbef 123
mauroar211 0:b805b487fbef 124 uint8_t checksum = read();
mauroar211 0:b805b487fbef 125 if (0 != (uint8_t)(sum + checksum)) {
mauroar211 0:b805b487fbef 126 DMSG("checksum is not ok\n");
mauroar211 0:b805b487fbef 127 result = PN532_INVALID_FRAME;
mauroar211 0:b805b487fbef 128 break;
mauroar211 0:b805b487fbef 129 }
mauroar211 0:b805b487fbef 130 read(); // POSTAMBLE
mauroar211 0:b805b487fbef 131
mauroar211 0:b805b487fbef 132 result = length;
mauroar211 0:b805b487fbef 133 } while (0);
mauroar211 0:b805b487fbef 134
mauroar211 0:b805b487fbef 135 _ss = 1;
mauroar211 0:b805b487fbef 136
mauroar211 0:b805b487fbef 137 return result;
mauroar211 0:b805b487fbef 138 }
mauroar211 0:b805b487fbef 139
mauroar211 0:b805b487fbef 140 bool PN532_SPI::isReady()
mauroar211 0:b805b487fbef 141 {
mauroar211 0:b805b487fbef 142 _ss = 0;
mauroar211 0:b805b487fbef 143
mauroar211 0:b805b487fbef 144 write(STATUS_READ);
mauroar211 0:b805b487fbef 145 uint8_t status = read() & 1;
mauroar211 0:b805b487fbef 146 _ss = 1;
mauroar211 0:b805b487fbef 147 return status;
mauroar211 0:b805b487fbef 148 }
mauroar211 0:b805b487fbef 149
mauroar211 0:b805b487fbef 150 void PN532_SPI::writeFrame(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
mauroar211 0:b805b487fbef 151 {
mauroar211 0:b805b487fbef 152 _ss = 0;
mauroar211 0:b805b487fbef 153 wait_ms(2); // wake up PN532
mauroar211 0:b805b487fbef 154
mauroar211 0:b805b487fbef 155 write(DATA_WRITE);
mauroar211 0:b805b487fbef 156 write(PN532_PREAMBLE);
mauroar211 0:b805b487fbef 157 write(PN532_STARTCODE1);
mauroar211 0:b805b487fbef 158 write(PN532_STARTCODE2);
mauroar211 0:b805b487fbef 159
mauroar211 0:b805b487fbef 160 uint8_t length = hlen + blen + 1; // length of data field: TFI + DATA
mauroar211 0:b805b487fbef 161 write(length);
mauroar211 0:b805b487fbef 162 write(~length + 1); // checksum of length
mauroar211 0:b805b487fbef 163
mauroar211 0:b805b487fbef 164 write(PN532_HOSTTOPN532);
mauroar211 0:b805b487fbef 165 uint8_t sum = PN532_HOSTTOPN532; // sum of TFI + DATA
mauroar211 0:b805b487fbef 166
mauroar211 0:b805b487fbef 167 DMSG("write: ");
mauroar211 0:b805b487fbef 168
mauroar211 0:b805b487fbef 169 for (uint8_t i = 0; i < hlen; i++) {
mauroar211 0:b805b487fbef 170 write(header[i]);
mauroar211 0:b805b487fbef 171 sum += header[i];
mauroar211 0:b805b487fbef 172
mauroar211 0:b805b487fbef 173 DMSG_HEX(header[i]);
mauroar211 0:b805b487fbef 174 }
mauroar211 0:b805b487fbef 175 for (uint8_t i = 0; i < blen; i++) {
mauroar211 0:b805b487fbef 176 write(body[i]);
mauroar211 0:b805b487fbef 177 sum += body[i];
mauroar211 0:b805b487fbef 178
mauroar211 0:b805b487fbef 179 DMSG_HEX(header[i]);
mauroar211 0:b805b487fbef 180 }
mauroar211 0:b805b487fbef 181
mauroar211 0:b805b487fbef 182 uint8_t checksum = ~sum + 1; // checksum of TFI + DATA
mauroar211 0:b805b487fbef 183 write(checksum);
mauroar211 0:b805b487fbef 184 write(PN532_POSTAMBLE);
mauroar211 0:b805b487fbef 185
mauroar211 0:b805b487fbef 186 _ss = 1;
mauroar211 0:b805b487fbef 187
mauroar211 0:b805b487fbef 188 DMSG("\n");
mauroar211 0:b805b487fbef 189 }
mauroar211 0:b805b487fbef 190
mauroar211 0:b805b487fbef 191 int8_t PN532_SPI::readAckFrame()
mauroar211 0:b805b487fbef 192 {
mauroar211 0:b805b487fbef 193 const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0};
mauroar211 0:b805b487fbef 194
mauroar211 0:b805b487fbef 195 uint8_t ackBuf[sizeof(PN532_ACK)];
mauroar211 0:b805b487fbef 196
mauroar211 0:b805b487fbef 197 _ss = 0;
mauroar211 0:b805b487fbef 198 wait_ms(1);
mauroar211 0:b805b487fbef 199 write(DATA_READ);
mauroar211 0:b805b487fbef 200
mauroar211 0:b805b487fbef 201 for (uint8_t i = 0; i < sizeof(PN532_ACK); i++) {
mauroar211 0:b805b487fbef 202 ackBuf[i] = read();
mauroar211 0:b805b487fbef 203 }
mauroar211 0:b805b487fbef 204
mauroar211 0:b805b487fbef 205 _ss = 1;
mauroar211 0:b805b487fbef 206
mauroar211 0:b805b487fbef 207 return memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK));
mauroar211 0:b805b487fbef 208 }