1a2e5ee4
 henyxia
Big revision
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
#include "PN532_HSU.h"
#include "PN532_debug.h"
PN532_HSU::PN532_HSU(HardwareSerial &serial)
{
_serial = &serial;
command = 0;
}
void PN532_HSU::begin()
{
_serial->begin(115200);
}
void PN532_HSU::wakeup()
{
_serial->write(0x55);
_serial->write(0x55);
_serial->write(0);
_serial->write(0);
_serial->write(0);
/** dump serial buffer */
if(_serial->available()){
DMSG("Dump serial buffer: ");
}
while(_serial->available()){
uint8_t ret = _serial->read();
DMSG_HEX(ret);
}
}
int8_t PN532_HSU::writeCommand(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
{
/** dump serial buffer */
if(_serial->available()){
DMSG("Dump serial buffer: ");
}
while(_serial->available()){
uint8_t ret = _serial->read();
DMSG_HEX(ret);
}
command = header[0];
_serial->write(PN532_PREAMBLE);
_serial->write(PN532_STARTCODE1);
_serial->write(PN532_STARTCODE2);
uint8_t length = hlen + blen + 1; // length of data field: TFI + DATA
_serial->write(length);
_serial->write(~length + 1); // checksum of length
_serial->write(PN532_HOSTTOPN532);
uint8_t sum = PN532_HOSTTOPN532; // sum of TFI + DATA
DMSG("\nWrite: ");
_serial->write(header, hlen);
for (uint8_t i = 0; i < hlen; i++) {
sum += header[i];
DMSG_HEX(header[i]);
}
_serial->write(body, blen);
for (uint8_t i = 0; i < blen; i++) {
sum += body[i];
DMSG_HEX(body[i]);
}
uint8_t checksum = ~sum + 1; // checksum of TFI + DATA
_serial->write(checksum);
_serial->write(PN532_POSTAMBLE);
return readAckFrame();
}
int16_t PN532_HSU::readResponse(uint8_t buf[], uint8_t len, uint16_t timeout)
{
uint8_t tmp[3];
DMSG("\nRead: ");
/** Frame Preamble and Start Code */
if(receive(tmp, 3, timeout)<=0){
return PN532_TIMEOUT;
}
if(0 != tmp[0] || 0!= tmp[1] || 0xFF != tmp[2]){
DMSG("Preamble error");
return PN532_INVALID_FRAME;
}
/** receive length and check */
uint8_t length[2];
if(receive(length, 2, timeout) <= 0){
return PN532_TIMEOUT;
}
if( 0 != (uint8_t)(length[0] + length[1]) ){
DMSG("Length error");
return PN532_INVALID_FRAME;
}
length[0] -= 2;
if( length[0] > len){
return PN532_NO_SPACE;
}
/** receive command byte */
uint8_t cmd = command + 1; // response command
if(receive(tmp, 2, timeout) <= 0){
return PN532_TIMEOUT;
}
if( PN532_PN532TOHOST != tmp[0] || cmd != tmp[1]){
DMSG("Command error");
return PN532_INVALID_FRAME;
}
if(receive(buf, length[0], timeout) != length[0]){
return PN532_TIMEOUT;
}
uint8_t sum = PN532_PN532TOHOST + cmd;
for(uint8_t i=0; i<length[0]; i++){
sum += buf[i];
}
/** checksum and postamble */
if(receive(tmp, 2, timeout) <= 0){
return PN532_TIMEOUT;
}
if( 0 != (uint8_t)(sum + tmp[0]) || 0 != tmp[1] ){
DMSG("Checksum error");
return PN532_INVALID_FRAME;
}
return length[0];
}
int8_t PN532_HSU::readAckFrame()
{
const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0};
uint8_t ackBuf[sizeof(PN532_ACK)];
DMSG("\nAck: ");
if( receive(ackBuf, sizeof(PN532_ACK), PN532_ACK_WAIT_TIME) <= 0 ){
DMSG("Timeout\n");
return PN532_TIMEOUT;
}
if( memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK)) ){
DMSG("Invalid\n");
return PN532_INVALID_ACK;
}
return 0;
}
/**
@brief receive data .
@param buf --> return value buffer.
len --> length expect to receive.
timeout --> time of reveiving
@retval number of received bytes, 0 means no data received.
*/
int8_t PN532_HSU::receive(uint8_t *buf, int len, uint16_t timeout)
{
int read_bytes = 0;
int ret;
unsigned long start_millis;
while (read_bytes < len) {
start_millis = millis();
do {
ret = _serial->read();
if (ret >= 0) {
break;
}
} while((timeout == 0) || ((millis()- start_millis ) < timeout));
if (ret < 0) {
if(read_bytes){
return read_bytes;
}else{
return PN532_TIMEOUT;
}
}
buf[read_bytes] = (uint8_t)ret;
DMSG_HEX(ret);
read_bytes++;
}
return read_bytes;
}
|