PN532 Driver library This library provides an abstract API to drive the pn532 nfc chip, with I2C/HSU/SPI interface. Its based on the Seeed Studio's Arduino version.
PN532_IF/PN532_SPI.cpp@2:ae258f195bbd, 2020-06-26 (annotated)
- Committer:
- maximemau
- Date:
- Fri Jun 26 09:16:19 2020 +0000
- Revision:
- 2:ae258f195bbd
- Parent:
- 0:db8030e71f55
lib_pn532
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dotnfc | 0:db8030e71f55 | 1 | //////////////////////////////////////////////////////////////////////////////// |
dotnfc | 0:db8030e71f55 | 2 | // pn532 spi interface for mbed platform |
dotnfc | 0:db8030e71f55 | 3 | // |
dotnfc | 0:db8030e71f55 | 4 | // by dotnfc@163.com |
dotnfc | 0:db8030e71f55 | 5 | // 2016/09/10 18:16:00 |
dotnfc | 0:db8030e71f55 | 6 | |
dotnfc | 0:db8030e71f55 | 7 | #include "PN532_SPI.h" |
dotnfc | 0:db8030e71f55 | 8 | #include "PN532_debug.h" |
dotnfc | 0:db8030e71f55 | 9 | |
dotnfc | 0:db8030e71f55 | 10 | #define STATUS_READ 2 |
dotnfc | 0:db8030e71f55 | 11 | #define DATA_WRITE 1 |
dotnfc | 0:db8030e71f55 | 12 | #define DATA_READ 3 |
dotnfc | 0:db8030e71f55 | 13 | |
dotnfc | 0:db8030e71f55 | 14 | PN532_SPI::PN532_SPI(SPI &spi, PinName ss) : _ss(ss) |
dotnfc | 0:db8030e71f55 | 15 | { |
dotnfc | 0:db8030e71f55 | 16 | command = 0; |
dotnfc | 0:db8030e71f55 | 17 | _spi = &spi; |
dotnfc | 0:db8030e71f55 | 18 | _spi->format(8, 0); |
dotnfc | 0:db8030e71f55 | 19 | _spi->frequency(2000000); |
dotnfc | 0:db8030e71f55 | 20 | |
dotnfc | 0:db8030e71f55 | 21 | _ss = 1; |
dotnfc | 0:db8030e71f55 | 22 | } |
dotnfc | 0:db8030e71f55 | 23 | |
dotnfc | 0:db8030e71f55 | 24 | PN532_SPI::PN532_SPI(SPI *spi, PinName ss) : _ss(ss) |
dotnfc | 0:db8030e71f55 | 25 | { |
dotnfc | 0:db8030e71f55 | 26 | command = 0; |
dotnfc | 0:db8030e71f55 | 27 | _spi = spi; |
dotnfc | 0:db8030e71f55 | 28 | _spi->format(8, 0); |
dotnfc | 0:db8030e71f55 | 29 | _spi->frequency(2000000); |
dotnfc | 0:db8030e71f55 | 30 | |
dotnfc | 0:db8030e71f55 | 31 | _ss = 1; |
dotnfc | 0:db8030e71f55 | 32 | } |
dotnfc | 0:db8030e71f55 | 33 | |
dotnfc | 0:db8030e71f55 | 34 | void PN532_SPI::begin() |
dotnfc | 0:db8030e71f55 | 35 | { |
dotnfc | 0:db8030e71f55 | 36 | |
dotnfc | 0:db8030e71f55 | 37 | } |
dotnfc | 0:db8030e71f55 | 38 | |
dotnfc | 0:db8030e71f55 | 39 | void PN532_SPI::wakeup() |
dotnfc | 0:db8030e71f55 | 40 | { |
dotnfc | 0:db8030e71f55 | 41 | _ss = 0; |
dotnfc | 0:db8030e71f55 | 42 | wait_ms(2); |
dotnfc | 0:db8030e71f55 | 43 | _ss = 1; |
dotnfc | 0:db8030e71f55 | 44 | } |
dotnfc | 0:db8030e71f55 | 45 | |
dotnfc | 0:db8030e71f55 | 46 | int8_t PN532_SPI::writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen) |
dotnfc | 0:db8030e71f55 | 47 | { |
dotnfc | 0:db8030e71f55 | 48 | command = header[0]; |
dotnfc | 0:db8030e71f55 | 49 | writeFrame(header, hlen, body, blen); |
dotnfc | 0:db8030e71f55 | 50 | |
dotnfc | 0:db8030e71f55 | 51 | Timer timer; |
dotnfc | 0:db8030e71f55 | 52 | timer.start(); |
dotnfc | 0:db8030e71f55 | 53 | |
dotnfc | 0:db8030e71f55 | 54 | while (!isReady()) { |
dotnfc | 0:db8030e71f55 | 55 | if (timer.read_ms() > PN532_ACK_WAIT_TIME) { |
dotnfc | 0:db8030e71f55 | 56 | DMSG("Time out when waiting for ACK\n"); |
dotnfc | 0:db8030e71f55 | 57 | timer.stop (); |
dotnfc | 0:db8030e71f55 | 58 | return -2; |
dotnfc | 0:db8030e71f55 | 59 | } |
dotnfc | 0:db8030e71f55 | 60 | } |
dotnfc | 0:db8030e71f55 | 61 | if (readAckFrame()) { |
dotnfc | 0:db8030e71f55 | 62 | DMSG("Invalid ACK\n"); |
dotnfc | 0:db8030e71f55 | 63 | return PN532_INVALID_ACK; |
dotnfc | 0:db8030e71f55 | 64 | } |
dotnfc | 0:db8030e71f55 | 65 | return 0; |
dotnfc | 0:db8030e71f55 | 66 | } |
dotnfc | 0:db8030e71f55 | 67 | |
dotnfc | 0:db8030e71f55 | 68 | int16_t PN532_SPI::readResponse(uint8_t buf[], uint8_t len, uint16_t timeout) |
dotnfc | 0:db8030e71f55 | 69 | { |
dotnfc | 0:db8030e71f55 | 70 | Timer timer; |
dotnfc | 0:db8030e71f55 | 71 | if (timeout > 0) |
dotnfc | 0:db8030e71f55 | 72 | timer.start(); |
dotnfc | 0:db8030e71f55 | 73 | |
dotnfc | 0:db8030e71f55 | 74 | while (!isReady()) { |
dotnfc | 0:db8030e71f55 | 75 | |
dotnfc | 0:db8030e71f55 | 76 | if (timeout > 0){ |
dotnfc | 0:db8030e71f55 | 77 | if (timer.read_ms() > timeout) { |
dotnfc | 0:db8030e71f55 | 78 | timer.stop(); |
dotnfc | 0:db8030e71f55 | 79 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 80 | } |
dotnfc | 0:db8030e71f55 | 81 | } |
dotnfc | 0:db8030e71f55 | 82 | } |
dotnfc | 0:db8030e71f55 | 83 | |
dotnfc | 0:db8030e71f55 | 84 | _ss = 0; |
dotnfc | 0:db8030e71f55 | 85 | wait_ms(1); |
dotnfc | 0:db8030e71f55 | 86 | |
dotnfc | 0:db8030e71f55 | 87 | int16_t result; |
dotnfc | 0:db8030e71f55 | 88 | do { |
dotnfc | 0:db8030e71f55 | 89 | write(DATA_READ); |
dotnfc | 0:db8030e71f55 | 90 | |
dotnfc | 0:db8030e71f55 | 91 | if (0x00 != read() || // PREAMBLE |
dotnfc | 0:db8030e71f55 | 92 | 0x00 != read() || // STARTCODE1 |
dotnfc | 0:db8030e71f55 | 93 | 0xFF != read() // STARTCODE2 |
dotnfc | 0:db8030e71f55 | 94 | ) { |
dotnfc | 0:db8030e71f55 | 95 | |
dotnfc | 0:db8030e71f55 | 96 | result = PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 97 | break; |
dotnfc | 0:db8030e71f55 | 98 | } |
dotnfc | 0:db8030e71f55 | 99 | |
dotnfc | 0:db8030e71f55 | 100 | uint8_t length = read(); |
dotnfc | 0:db8030e71f55 | 101 | if (0 != (uint8_t)(length + read())) { // checksum of length |
dotnfc | 0:db8030e71f55 | 102 | result = PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 103 | break; |
dotnfc | 0:db8030e71f55 | 104 | } |
dotnfc | 0:db8030e71f55 | 105 | |
dotnfc | 0:db8030e71f55 | 106 | uint8_t cmd = command + 1; // response command |
dotnfc | 0:db8030e71f55 | 107 | if (PN532_PN532TOHOST != read() || (cmd) != read()) { |
dotnfc | 0:db8030e71f55 | 108 | result = PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 109 | break; |
dotnfc | 0:db8030e71f55 | 110 | } |
dotnfc | 0:db8030e71f55 | 111 | |
dotnfc | 0:db8030e71f55 | 112 | DMSG("read: "); |
dotnfc | 0:db8030e71f55 | 113 | DMSG_HEX(cmd); |
dotnfc | 0:db8030e71f55 | 114 | |
dotnfc | 0:db8030e71f55 | 115 | length -= 2; |
dotnfc | 0:db8030e71f55 | 116 | if (length > len) { |
dotnfc | 0:db8030e71f55 | 117 | for (uint8_t i = 0; i < length; i++) { |
dotnfc | 0:db8030e71f55 | 118 | DMSG_HEX(read()); // dump message |
dotnfc | 0:db8030e71f55 | 119 | } |
dotnfc | 0:db8030e71f55 | 120 | DMSG("\nNot enough space\n"); |
dotnfc | 0:db8030e71f55 | 121 | read(); |
dotnfc | 0:db8030e71f55 | 122 | read(); |
dotnfc | 0:db8030e71f55 | 123 | result = PN532_NO_SPACE; // not enough space |
dotnfc | 0:db8030e71f55 | 124 | break; |
dotnfc | 0:db8030e71f55 | 125 | } |
dotnfc | 0:db8030e71f55 | 126 | |
dotnfc | 0:db8030e71f55 | 127 | uint8_t sum = PN532_PN532TOHOST + cmd; |
dotnfc | 0:db8030e71f55 | 128 | for (uint8_t i = 0; i < length; i++) { |
dotnfc | 0:db8030e71f55 | 129 | buf[i] = read(); |
dotnfc | 0:db8030e71f55 | 130 | sum += buf[i]; |
dotnfc | 0:db8030e71f55 | 131 | |
dotnfc | 0:db8030e71f55 | 132 | DMSG_HEX(buf[i]); |
dotnfc | 0:db8030e71f55 | 133 | } |
dotnfc | 0:db8030e71f55 | 134 | DMSG("\n"); |
dotnfc | 0:db8030e71f55 | 135 | |
dotnfc | 0:db8030e71f55 | 136 | uint8_t checksum = read(); |
dotnfc | 0:db8030e71f55 | 137 | if (0 != (uint8_t)(sum + checksum)) { |
dotnfc | 0:db8030e71f55 | 138 | DMSG("checksum is not ok\n"); |
dotnfc | 0:db8030e71f55 | 139 | result = PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 140 | break; |
dotnfc | 0:db8030e71f55 | 141 | } |
dotnfc | 0:db8030e71f55 | 142 | read(); // POSTAMBLE |
dotnfc | 0:db8030e71f55 | 143 | |
dotnfc | 0:db8030e71f55 | 144 | result = length; |
dotnfc | 0:db8030e71f55 | 145 | } while (0); |
dotnfc | 0:db8030e71f55 | 146 | |
dotnfc | 0:db8030e71f55 | 147 | _ss = 1; |
dotnfc | 0:db8030e71f55 | 148 | |
dotnfc | 0:db8030e71f55 | 149 | return result; |
dotnfc | 0:db8030e71f55 | 150 | } |
dotnfc | 0:db8030e71f55 | 151 | |
dotnfc | 0:db8030e71f55 | 152 | bool PN532_SPI::isReady() |
dotnfc | 0:db8030e71f55 | 153 | { |
dotnfc | 0:db8030e71f55 | 154 | _ss = 0; |
dotnfc | 0:db8030e71f55 | 155 | |
dotnfc | 0:db8030e71f55 | 156 | write(STATUS_READ); |
dotnfc | 0:db8030e71f55 | 157 | uint8_t status = read() & 1; |
dotnfc | 0:db8030e71f55 | 158 | _ss = 1; |
dotnfc | 0:db8030e71f55 | 159 | return status; |
dotnfc | 0:db8030e71f55 | 160 | } |
dotnfc | 0:db8030e71f55 | 161 | |
dotnfc | 0:db8030e71f55 | 162 | void PN532_SPI::writeFrame(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen) |
dotnfc | 0:db8030e71f55 | 163 | { |
dotnfc | 0:db8030e71f55 | 164 | _ss = 0; |
dotnfc | 0:db8030e71f55 | 165 | wait_ms(2); // wake up PN532 |
dotnfc | 0:db8030e71f55 | 166 | |
dotnfc | 0:db8030e71f55 | 167 | write(DATA_WRITE); |
dotnfc | 0:db8030e71f55 | 168 | write(PN532_PREAMBLE); |
dotnfc | 0:db8030e71f55 | 169 | write(PN532_STARTCODE1); |
dotnfc | 0:db8030e71f55 | 170 | write(PN532_STARTCODE2); |
dotnfc | 0:db8030e71f55 | 171 | |
dotnfc | 0:db8030e71f55 | 172 | uint8_t length = hlen + blen + 1; // length of data field: TFI + DATA |
dotnfc | 0:db8030e71f55 | 173 | write(length); |
dotnfc | 0:db8030e71f55 | 174 | write(~length + 1); // checksum of length |
dotnfc | 0:db8030e71f55 | 175 | |
dotnfc | 0:db8030e71f55 | 176 | write(PN532_HOSTTOPN532); |
dotnfc | 0:db8030e71f55 | 177 | uint8_t sum = PN532_HOSTTOPN532; // sum of TFI + DATA |
dotnfc | 0:db8030e71f55 | 178 | |
dotnfc | 0:db8030e71f55 | 179 | DMSG("write: "); |
dotnfc | 0:db8030e71f55 | 180 | |
dotnfc | 0:db8030e71f55 | 181 | for (uint8_t i = 0; i < hlen; i++) { |
dotnfc | 0:db8030e71f55 | 182 | write(header[i]); |
dotnfc | 0:db8030e71f55 | 183 | sum += header[i]; |
dotnfc | 0:db8030e71f55 | 184 | |
dotnfc | 0:db8030e71f55 | 185 | DMSG_HEX(header[i]); |
dotnfc | 0:db8030e71f55 | 186 | } |
dotnfc | 0:db8030e71f55 | 187 | for (uint8_t i = 0; i < blen; i++) { |
dotnfc | 0:db8030e71f55 | 188 | write(body[i]); |
dotnfc | 0:db8030e71f55 | 189 | sum += body[i]; |
dotnfc | 0:db8030e71f55 | 190 | |
dotnfc | 0:db8030e71f55 | 191 | DMSG_HEX(header[i]); |
dotnfc | 0:db8030e71f55 | 192 | } |
dotnfc | 0:db8030e71f55 | 193 | |
dotnfc | 0:db8030e71f55 | 194 | uint8_t checksum = ~sum + 1; // checksum of TFI + DATA |
dotnfc | 0:db8030e71f55 | 195 | write(checksum); |
dotnfc | 0:db8030e71f55 | 196 | write(PN532_POSTAMBLE); |
dotnfc | 0:db8030e71f55 | 197 | |
dotnfc | 0:db8030e71f55 | 198 | _ss = 1; |
dotnfc | 0:db8030e71f55 | 199 | |
dotnfc | 0:db8030e71f55 | 200 | DMSG("\n"); |
dotnfc | 0:db8030e71f55 | 201 | } |
dotnfc | 0:db8030e71f55 | 202 | |
dotnfc | 0:db8030e71f55 | 203 | int8_t PN532_SPI::readAckFrame() |
dotnfc | 0:db8030e71f55 | 204 | { |
dotnfc | 0:db8030e71f55 | 205 | const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0}; |
dotnfc | 0:db8030e71f55 | 206 | |
dotnfc | 0:db8030e71f55 | 207 | uint8_t ackBuf[sizeof(PN532_ACK)]; |
dotnfc | 0:db8030e71f55 | 208 | |
dotnfc | 0:db8030e71f55 | 209 | _ss = 0; |
dotnfc | 0:db8030e71f55 | 210 | wait_ms(1); |
dotnfc | 0:db8030e71f55 | 211 | write(DATA_READ); |
dotnfc | 0:db8030e71f55 | 212 | |
dotnfc | 0:db8030e71f55 | 213 | for (uint8_t i = 0; i < sizeof(PN532_ACK); i++) { |
dotnfc | 0:db8030e71f55 | 214 | ackBuf[i] = read(); |
dotnfc | 0:db8030e71f55 | 215 | } |
dotnfc | 0:db8030e71f55 | 216 | |
dotnfc | 0:db8030e71f55 | 217 | _ss = 1; |
dotnfc | 0:db8030e71f55 | 218 | |
dotnfc | 0:db8030e71f55 | 219 | return memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK)); |
dotnfc | 0:db8030e71f55 | 220 | } |