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Dependencies:   BufferedSerial mbed

slip.h@0:d84cdaf22096, 2016-04-18 (annotated)

Committer:
geky
Date:
Mon Apr 18 20:36:49 2016 +0000
Revision:
0:d84cdaf22096
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
geky 0:d84cdaf22096 1 #ifndef SLIP_H
geky 0:d84cdaf22096 2 #define SLIP_H
geky 0:d84cdaf22096 3
geky 0:d84cdaf22096 4 // Packet wrapping using the SLIP protocol
geky 0:d84cdaf22096 5 template <typename SERIAL>
geky 0:d84cdaf22096 6 class SLIPPacket {
geky 0:d84cdaf22096 7 private:
geky 0:d84cdaf22096 8 SERIAL _serial;
geky 0:d84cdaf22096 9
geky 0:d84cdaf22096 10 public:
geky 0:d84cdaf22096 11 SLIPPacket(PinName tx, PinName rx) : _serial(tx, rx) {}
geky 0:d84cdaf22096 12
geky 0:d84cdaf22096 13 int checkgetc() {
geky 0:d84cdaf22096 14 Timer timer;
geky 0:d84cdaf22096 15 timer.start();
geky 0:d84cdaf22096 16
geky 0:d84cdaf22096 17 while (!_serial.readable()) {
geky 0:d84cdaf22096 18 if (timer.read_ms() > 1500)
geky 0:d84cdaf22096 19 return -1;
geky 0:d84cdaf22096 20 }
geky 0:d84cdaf22096 21
geky 0:d84cdaf22096 22 int c = _serial.getc();
geky 0:d84cdaf22096 23 #ifdef DEBUG
geky 0:d84cdaf22096 24 printf("<- 0x%02x\r\n", c);
geky 0:d84cdaf22096 25 #endif
geky 0:d84cdaf22096 26 return c;
geky 0:d84cdaf22096 27 }
geky 0:d84cdaf22096 28
geky 0:d84cdaf22096 29 int checkputc(char c) {
geky 0:d84cdaf22096 30 wait_us(100);
geky 0:d84cdaf22096 31
geky 0:d84cdaf22096 32 while (!_serial.writeable())
geky 0:d84cdaf22096 33 ;
geky 0:d84cdaf22096 34
geky 0:d84cdaf22096 35 #ifdef DEBUG
geky 0:d84cdaf22096 36 printf("-> 0x%02x\r\n", c);
geky 0:d84cdaf22096 37 #endif
geky 0:d84cdaf22096 38 return _serial.putc(c);
geky 0:d84cdaf22096 39 }
geky 0:d84cdaf22096 40
geky 0:d84cdaf22096 41 void flush() {
geky 0:d84cdaf22096 42 while (_serial.readable())
geky 0:d84cdaf22096 43 _serial.getc();
geky 0:d84cdaf22096 44 }
geky 0:d84cdaf22096 45
geky 0:d84cdaf22096 46 public:
geky 0:d84cdaf22096 47 bool req_start() {
geky 0:d84cdaf22096 48 #ifdef LED_STATUS
geky 0:d84cdaf22096 49 led_blue = 0; // Show progress
geky 0:d84cdaf22096 50 #endif
geky 0:d84cdaf22096 51 return !(checkputc(0xc0) < 0);
geky 0:d84cdaf22096 52 }
geky 0:d84cdaf22096 53
geky 0:d84cdaf22096 54 bool req_finish() {
geky 0:d84cdaf22096 55 #ifdef LED_STATUS
geky 0:d84cdaf22096 56 led_blue = 1; // Show progress
geky 0:d84cdaf22096 57 #endif
geky 0:d84cdaf22096 58 return !(checkputc(0xc0) < 0);
geky 0:d84cdaf22096 59 }
geky 0:d84cdaf22096 60
geky 0:d84cdaf22096 61 bool putc(char c) {
geky 0:d84cdaf22096 62 switch (c) {
geky 0:d84cdaf22096 63 case 0xdb: return checkputc(0xdb) >= 0 && checkputc(0xdd) >= 0;
geky 0:d84cdaf22096 64 case 0xc0: return checkputc(0xdb) >= 0 && checkputc(0xdc) >= 0;
geky 0:d84cdaf22096 65 default: return checkputc(c) >= 0;
geky 0:d84cdaf22096 66 }
geky 0:d84cdaf22096 67 }
geky 0:d84cdaf22096 68
geky 0:d84cdaf22096 69 bool send(const void *data, int len) {
geky 0:d84cdaf22096 70 for (int i = 0; i < len; i++) {
geky 0:d84cdaf22096 71 if (!putc(((char *)data)[i]))
geky 0:d84cdaf22096 72 return false;
geky 0:d84cdaf22096 73 }
geky 0:d84cdaf22096 74
geky 0:d84cdaf22096 75 return true;
geky 0:d84cdaf22096 76 }
geky 0:d84cdaf22096 77
geky 0:d84cdaf22096 78 public:
geky 0:d84cdaf22096 79 bool resp_start() {
geky 0:d84cdaf22096 80 return checkgetc() == 0xc0;
geky 0:d84cdaf22096 81 }
geky 0:d84cdaf22096 82
geky 0:d84cdaf22096 83 bool resp_finish() {
geky 0:d84cdaf22096 84 return checkgetc() == 0xc0;
geky 0:d84cdaf22096 85 }
geky 0:d84cdaf22096 86
geky 0:d84cdaf22096 87 int getc() {
geky 0:d84cdaf22096 88 int c = checkgetc();
geky 0:d84cdaf22096 89
geky 0:d84cdaf22096 90 if (c < 0) {
geky 0:d84cdaf22096 91 return -1;
geky 0:d84cdaf22096 92 } else if (c == 0xdb) {
geky 0:d84cdaf22096 93 c = checkgetc();
geky 0:d84cdaf22096 94 switch (c) {
geky 0:d84cdaf22096 95 case 0xdd: return 0xdb;
geky 0:d84cdaf22096 96 case 0xdc: return 0xc0;
geky 0:d84cdaf22096 97 default: return -1;
geky 0:d84cdaf22096 98 }
geky 0:d84cdaf22096 99 } else {
geky 0:d84cdaf22096 100 return c;
geky 0:d84cdaf22096 101 }
geky 0:d84cdaf22096 102 }
geky 0:d84cdaf22096 103
geky 0:d84cdaf22096 104 bool recv(void *resp, int len) {
geky 0:d84cdaf22096 105 for (int i = 0; i < len; i++) {
geky 0:d84cdaf22096 106 int c = getc();
geky 0:d84cdaf22096 107
geky 0:d84cdaf22096 108 if (c < 0)
geky 0:d84cdaf22096 109 return false;
geky 0:d84cdaf22096 110
geky 0:d84cdaf22096 111 if (resp)
geky 0:d84cdaf22096 112 ((char *)resp)[i] = c;
geky 0:d84cdaf22096 113 }
geky 0:d84cdaf22096 114
geky 0:d84cdaf22096 115 return true;
geky 0:d84cdaf22096 116 }
geky 0:d84cdaf22096 117 };
geky 0:d84cdaf22096 118
geky 0:d84cdaf22096 119 #endif