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_HSU.cpp@0:db8030e71f55, 2016-09-13 (annotated)
- Committer:
- dotnfc
- Date:
- Tue Sep 13 06:01:19 2016 +0000
- Revision:
- 0:db8030e71f55
first commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dotnfc | 0:db8030e71f55 | 1 | //////////////////////////////////////////////////////////////////////////////// |
dotnfc | 0:db8030e71f55 | 2 | // pn532 hsu 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_HSU.h" |
dotnfc | 0:db8030e71f55 | 8 | #include "PN532_debug.h" |
dotnfc | 0:db8030e71f55 | 9 | |
dotnfc | 0:db8030e71f55 | 10 | |
dotnfc | 0:db8030e71f55 | 11 | PN532_HSU::PN532_HSU(HardwareSerial &serial) |
dotnfc | 0:db8030e71f55 | 12 | { |
dotnfc | 0:db8030e71f55 | 13 | _serial = &serial; |
dotnfc | 0:db8030e71f55 | 14 | command = 0; |
dotnfc | 0:db8030e71f55 | 15 | } |
dotnfc | 0:db8030e71f55 | 16 | |
dotnfc | 0:db8030e71f55 | 17 | void PN532_HSU::begin() |
dotnfc | 0:db8030e71f55 | 18 | { |
dotnfc | 0:db8030e71f55 | 19 | _serial->baud(115200); |
dotnfc | 0:db8030e71f55 | 20 | } |
dotnfc | 0:db8030e71f55 | 21 | |
dotnfc | 0:db8030e71f55 | 22 | void PN532_HSU::wakeup() |
dotnfc | 0:db8030e71f55 | 23 | { |
dotnfc | 0:db8030e71f55 | 24 | const uint8_t wakeup_cmd[] = { 0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x05, 0xFB, 0xD4, 0x14, 0x01, 0x00, 0x01, 0x16, 0x00 }; |
dotnfc | 0:db8030e71f55 | 25 | _serial->write(wakeup_cmd, sizeof(wakeup_cmd)); |
dotnfc | 0:db8030e71f55 | 26 | |
dotnfc | 0:db8030e71f55 | 27 | delay (50); |
dotnfc | 0:db8030e71f55 | 28 | |
dotnfc | 0:db8030e71f55 | 29 | /** dump serial buffer */ |
dotnfc | 0:db8030e71f55 | 30 | if(_serial->readable()){ |
dotnfc | 0:db8030e71f55 | 31 | DMSG("Dump sperial buffer: "); |
dotnfc | 0:db8030e71f55 | 32 | } |
dotnfc | 0:db8030e71f55 | 33 | while(_serial->readable()){ |
dotnfc | 0:db8030e71f55 | 34 | uint8_t ret = _serial->getc(); |
dotnfc | 0:db8030e71f55 | 35 | DMSG_HEX(ret); |
dotnfc | 0:db8030e71f55 | 36 | } |
dotnfc | 0:db8030e71f55 | 37 | DMSG("\n"); |
dotnfc | 0:db8030e71f55 | 38 | } |
dotnfc | 0:db8030e71f55 | 39 | |
dotnfc | 0:db8030e71f55 | 40 | int8_t PN532_HSU::writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen) |
dotnfc | 0:db8030e71f55 | 41 | { |
dotnfc | 0:db8030e71f55 | 42 | /** dump serial buffer */ |
dotnfc | 0:db8030e71f55 | 43 | if(_serial->readable()){ |
dotnfc | 0:db8030e71f55 | 44 | DMSG("Dump sperial buffer: "); |
dotnfc | 0:db8030e71f55 | 45 | } |
dotnfc | 0:db8030e71f55 | 46 | while(_serial->readable()){ |
dotnfc | 0:db8030e71f55 | 47 | uint8_t ret = _serial->getc(); |
dotnfc | 0:db8030e71f55 | 48 | DMSG_HEX(ret); |
dotnfc | 0:db8030e71f55 | 49 | } |
dotnfc | 0:db8030e71f55 | 50 | DMSG("\n"); |
dotnfc | 0:db8030e71f55 | 51 | |
dotnfc | 0:db8030e71f55 | 52 | command = header[0]; |
dotnfc | 0:db8030e71f55 | 53 | |
dotnfc | 0:db8030e71f55 | 54 | _serial->write(PN532_PREAMBLE); |
dotnfc | 0:db8030e71f55 | 55 | _serial->write(PN532_STARTCODE1); |
dotnfc | 0:db8030e71f55 | 56 | _serial->write(PN532_STARTCODE2); |
dotnfc | 0:db8030e71f55 | 57 | |
dotnfc | 0:db8030e71f55 | 58 | uint8_t length = hlen + blen + 1; // length of data field: TFI + DATA |
dotnfc | 0:db8030e71f55 | 59 | _serial->write(length); |
dotnfc | 0:db8030e71f55 | 60 | _serial->write(~length + 1); // checksum of length |
dotnfc | 0:db8030e71f55 | 61 | |
dotnfc | 0:db8030e71f55 | 62 | _serial->write(PN532_HOSTTOPN532); |
dotnfc | 0:db8030e71f55 | 63 | uint8_t sum = PN532_HOSTTOPN532; // sum of TFI + DATA |
dotnfc | 0:db8030e71f55 | 64 | |
dotnfc | 0:db8030e71f55 | 65 | DMSG("\nWrite: "); |
dotnfc | 0:db8030e71f55 | 66 | |
dotnfc | 0:db8030e71f55 | 67 | _serial->write(header, hlen); |
dotnfc | 0:db8030e71f55 | 68 | for (uint8_t i = 0; i < hlen; i++) { |
dotnfc | 0:db8030e71f55 | 69 | sum += header[i]; |
dotnfc | 0:db8030e71f55 | 70 | |
dotnfc | 0:db8030e71f55 | 71 | DMSG_HEX(header[i]); |
dotnfc | 0:db8030e71f55 | 72 | } |
dotnfc | 0:db8030e71f55 | 73 | |
dotnfc | 0:db8030e71f55 | 74 | _serial->write(body, blen); |
dotnfc | 0:db8030e71f55 | 75 | for (uint8_t i = 0; i < blen; i++) { |
dotnfc | 0:db8030e71f55 | 76 | sum += body[i]; |
dotnfc | 0:db8030e71f55 | 77 | |
dotnfc | 0:db8030e71f55 | 78 | DMSG_HEX(body[i]); |
dotnfc | 0:db8030e71f55 | 79 | } |
dotnfc | 0:db8030e71f55 | 80 | |
dotnfc | 0:db8030e71f55 | 81 | uint8_t checksum = ~sum + 1; // checksum of TFI + DATA |
dotnfc | 0:db8030e71f55 | 82 | _serial->write(checksum); |
dotnfc | 0:db8030e71f55 | 83 | _serial->write(PN532_POSTAMBLE); |
dotnfc | 0:db8030e71f55 | 84 | |
dotnfc | 0:db8030e71f55 | 85 | delay (50); |
dotnfc | 0:db8030e71f55 | 86 | return readAckFrame(); |
dotnfc | 0:db8030e71f55 | 87 | } |
dotnfc | 0:db8030e71f55 | 88 | |
dotnfc | 0:db8030e71f55 | 89 | int16_t PN532_HSU::readResponse(uint8_t buf[], uint8_t len, uint16_t timeout) |
dotnfc | 0:db8030e71f55 | 90 | { |
dotnfc | 0:db8030e71f55 | 91 | uint8_t tmp[3]; |
dotnfc | 0:db8030e71f55 | 92 | |
dotnfc | 0:db8030e71f55 | 93 | delay(100); |
dotnfc | 0:db8030e71f55 | 94 | |
dotnfc | 0:db8030e71f55 | 95 | DMSG("\nRead: "); |
dotnfc | 0:db8030e71f55 | 96 | |
dotnfc | 0:db8030e71f55 | 97 | /** Frame Preamble and Start Code */ |
dotnfc | 0:db8030e71f55 | 98 | if(receive(tmp, 3, timeout)<=0){ |
dotnfc | 0:db8030e71f55 | 99 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 100 | } |
dotnfc | 0:db8030e71f55 | 101 | if(0 != tmp[0] || 0!= tmp[1] || 0xFF != tmp[2]){ |
dotnfc | 0:db8030e71f55 | 102 | DMSG("Preamble error"); |
dotnfc | 0:db8030e71f55 | 103 | return PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 104 | } |
dotnfc | 0:db8030e71f55 | 105 | |
dotnfc | 0:db8030e71f55 | 106 | /** receive length and check */ |
dotnfc | 0:db8030e71f55 | 107 | uint8_t length[2]; |
dotnfc | 0:db8030e71f55 | 108 | if(receive(length, 2, timeout) <= 0){ |
dotnfc | 0:db8030e71f55 | 109 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 110 | } |
dotnfc | 0:db8030e71f55 | 111 | if( 0 != (uint8_t)(length[0] + length[1]) ){ |
dotnfc | 0:db8030e71f55 | 112 | DMSG("Length error\n"); |
dotnfc | 0:db8030e71f55 | 113 | return PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 114 | } |
dotnfc | 0:db8030e71f55 | 115 | length[0] -= 2; |
dotnfc | 0:db8030e71f55 | 116 | if( length[0] > len){ |
dotnfc | 0:db8030e71f55 | 117 | return PN532_NO_SPACE; |
dotnfc | 0:db8030e71f55 | 118 | } |
dotnfc | 0:db8030e71f55 | 119 | |
dotnfc | 0:db8030e71f55 | 120 | /** receive command byte */ |
dotnfc | 0:db8030e71f55 | 121 | uint8_t cmd = command + 1; // response command |
dotnfc | 0:db8030e71f55 | 122 | if(receive(tmp, 2, timeout) <= 0){ |
dotnfc | 0:db8030e71f55 | 123 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 124 | } |
dotnfc | 0:db8030e71f55 | 125 | if( PN532_PN532TOHOST != tmp[0] || cmd != tmp[1]){ |
dotnfc | 0:db8030e71f55 | 126 | DMSG("Command error\n"); |
dotnfc | 0:db8030e71f55 | 127 | return PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 128 | } |
dotnfc | 0:db8030e71f55 | 129 | |
dotnfc | 0:db8030e71f55 | 130 | if(receive(buf, length[0], timeout) != length[0]){ |
dotnfc | 0:db8030e71f55 | 131 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 132 | } |
dotnfc | 0:db8030e71f55 | 133 | uint8_t sum = PN532_PN532TOHOST + cmd; |
dotnfc | 0:db8030e71f55 | 134 | for(uint8_t i=0; i<length[0]; i++){ |
dotnfc | 0:db8030e71f55 | 135 | sum += buf[i]; |
dotnfc | 0:db8030e71f55 | 136 | } |
dotnfc | 0:db8030e71f55 | 137 | |
dotnfc | 0:db8030e71f55 | 138 | /** checksum and postamble */ |
dotnfc | 0:db8030e71f55 | 139 | if(receive(tmp, 2, timeout) <= 0){ |
dotnfc | 0:db8030e71f55 | 140 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 141 | } |
dotnfc | 0:db8030e71f55 | 142 | if( 0 != (uint8_t)(sum + tmp[0]) || 0 != tmp[1] ){ |
dotnfc | 0:db8030e71f55 | 143 | DMSG("Checksum error\n"); |
dotnfc | 0:db8030e71f55 | 144 | return PN532_INVALID_FRAME; |
dotnfc | 0:db8030e71f55 | 145 | } |
dotnfc | 0:db8030e71f55 | 146 | |
dotnfc | 0:db8030e71f55 | 147 | DMSG ("\n"); |
dotnfc | 0:db8030e71f55 | 148 | return length[0]; |
dotnfc | 0:db8030e71f55 | 149 | } |
dotnfc | 0:db8030e71f55 | 150 | |
dotnfc | 0:db8030e71f55 | 151 | int8_t PN532_HSU::readAckFrame() |
dotnfc | 0:db8030e71f55 | 152 | { |
dotnfc | 0:db8030e71f55 | 153 | const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0}; |
dotnfc | 0:db8030e71f55 | 154 | uint8_t ackBuf[sizeof(PN532_ACK)]; |
dotnfc | 0:db8030e71f55 | 155 | |
dotnfc | 0:db8030e71f55 | 156 | delay(100); |
dotnfc | 0:db8030e71f55 | 157 | |
dotnfc | 0:db8030e71f55 | 158 | DMSG("\nAck: "); |
dotnfc | 0:db8030e71f55 | 159 | |
dotnfc | 0:db8030e71f55 | 160 | if( receive(ackBuf, sizeof(PN532_ACK), PN532_ACK_WAIT_TIME) <= 0 ){ |
dotnfc | 0:db8030e71f55 | 161 | DMSG("Timeout\n"); |
dotnfc | 0:db8030e71f55 | 162 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 163 | } |
dotnfc | 0:db8030e71f55 | 164 | |
dotnfc | 0:db8030e71f55 | 165 | if( memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK)) ){ |
dotnfc | 0:db8030e71f55 | 166 | DMSG("Invalid\n"); |
dotnfc | 0:db8030e71f55 | 167 | return PN532_INVALID_ACK; |
dotnfc | 0:db8030e71f55 | 168 | } |
dotnfc | 0:db8030e71f55 | 169 | return 0; |
dotnfc | 0:db8030e71f55 | 170 | } |
dotnfc | 0:db8030e71f55 | 171 | |
dotnfc | 0:db8030e71f55 | 172 | /** |
dotnfc | 0:db8030e71f55 | 173 | @brief receive data . |
dotnfc | 0:db8030e71f55 | 174 | @param buf --> return value buffer. |
dotnfc | 0:db8030e71f55 | 175 | len --> length expect to receive. |
dotnfc | 0:db8030e71f55 | 176 | timeout --> time of reveiving |
dotnfc | 0:db8030e71f55 | 177 | @retval number of received bytes, 0 means no data received. |
dotnfc | 0:db8030e71f55 | 178 | */ |
dotnfc | 0:db8030e71f55 | 179 | int8_t PN532_HSU::receive(uint8_t *buf, int len, uint16_t timeout) |
dotnfc | 0:db8030e71f55 | 180 | { |
dotnfc | 0:db8030e71f55 | 181 | int read_bytes = 0; |
dotnfc | 0:db8030e71f55 | 182 | int ret; |
dotnfc | 0:db8030e71f55 | 183 | Timer tmr_hsu; |
dotnfc | 0:db8030e71f55 | 184 | unsigned long start_millis; |
dotnfc | 0:db8030e71f55 | 185 | |
dotnfc | 0:db8030e71f55 | 186 | tmr_hsu.start(); |
dotnfc | 0:db8030e71f55 | 187 | while (read_bytes < len) { |
dotnfc | 0:db8030e71f55 | 188 | start_millis = tmr_hsu.read_ms(); // millis(); |
dotnfc | 0:db8030e71f55 | 189 | do { |
dotnfc | 0:db8030e71f55 | 190 | ret = _serial->getc(); |
dotnfc | 0:db8030e71f55 | 191 | if (ret >= 0) { |
dotnfc | 0:db8030e71f55 | 192 | break; |
dotnfc | 0:db8030e71f55 | 193 | } |
dotnfc | 0:db8030e71f55 | 194 | delay(10); |
dotnfc | 0:db8030e71f55 | 195 | } while((timeout == 0) || ((tmr_hsu.read_ms() /* millis() */ - start_millis ) < timeout)); |
dotnfc | 0:db8030e71f55 | 196 | |
dotnfc | 0:db8030e71f55 | 197 | if (ret < 0) { |
dotnfc | 0:db8030e71f55 | 198 | if(read_bytes){ |
dotnfc | 0:db8030e71f55 | 199 | tmr_hsu.stop (); |
dotnfc | 0:db8030e71f55 | 200 | return read_bytes; |
dotnfc | 0:db8030e71f55 | 201 | }else{ |
dotnfc | 0:db8030e71f55 | 202 | tmr_hsu.stop (); |
dotnfc | 0:db8030e71f55 | 203 | return PN532_TIMEOUT; |
dotnfc | 0:db8030e71f55 | 204 | } |
dotnfc | 0:db8030e71f55 | 205 | } |
dotnfc | 0:db8030e71f55 | 206 | buf[read_bytes] = (uint8_t)ret; |
dotnfc | 0:db8030e71f55 | 207 | DMSG_HEX(ret); |
dotnfc | 0:db8030e71f55 | 208 | read_bytes++; |
dotnfc | 0:db8030e71f55 | 209 | } |
dotnfc | 0:db8030e71f55 | 210 | |
dotnfc | 0:db8030e71f55 | 211 | tmr_hsu.stop (); |
dotnfc | 0:db8030e71f55 | 212 | return read_bytes; |
dotnfc | 0:db8030e71f55 | 213 | } |