source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/libraries/Bridge/src/BridgeClient.cpp @ 46

Last change on this file since 46 was 46, checked in by jrpelegrina, 4 years ago

First release to Xenial

File size: 3.8 KB
Line 
1/*
2  Copyright (c) 2013 Arduino LLC. All right reserved.
3
4  This library is free software; you can redistribute it and/or
5  modify it under the terms of the GNU Lesser General Public
6  License as published by the Free Software Foundation; either
7  version 2.1 of the License, or (at your option) any later version.
8
9  This library is distributed in the hope that it will be useful,
10  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  Lesser General Public License for more details.
13
14  You should have received a copy of the GNU Lesser General Public
15  License along with this library; if not, write to the Free Software
16  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17*/
18
19#include <BridgeClient.h>
20
21BridgeClient::BridgeClient(uint8_t _h, BridgeClass &_b) :
22  bridge(_b), handle(_h), opened(true), buffered(0) {
23}
24
25BridgeClient::BridgeClient(BridgeClass &_b) :
26  bridge(_b), handle(0), opened(false), buffered(0) {
27}
28
29BridgeClient::~BridgeClient() {
30}
31
32BridgeClient& BridgeClient::operator=(const BridgeClient &_x) {
33  opened = _x.opened;
34  handle = _x.handle;
35  return *this;
36}
37
38void BridgeClient::stop() {
39  if (opened) {
40    uint8_t cmd[] = {'j', handle};
41    bridge.transfer(cmd, 2);
42  }
43  opened = false;
44  buffered = 0;
45  readPos = 0;
46}
47
48void BridgeClient::doBuffer() {
49  // If there are already char in buffer exit
50  if (buffered > 0)
51    return;
52
53  // Try to buffer up to 32 characters
54  readPos = 0;
55  uint8_t cmd[] = {'K', handle, sizeof(buffer)};
56  buffered = bridge.transfer(cmd, 3, buffer, sizeof(buffer));
57}
58
59int BridgeClient::available() {
60  // Look if there is new data available
61  doBuffer();
62  return buffered;
63}
64
65int BridgeClient::read() {
66  doBuffer();
67  if (buffered == 0)
68    return -1; // no chars available
69  else {
70    buffered--;
71    return buffer[readPos++];
72  }
73}
74
75int BridgeClient::read(uint8_t *buff, size_t size) {
76  size_t readed = 0;
77  do {
78    if (buffered == 0) {
79      doBuffer();
80      if (buffered == 0)
81        return readed;
82    }
83    buff[readed++] = buffer[readPos++];
84    buffered--;
85  } while (readed < size);
86  return readed;
87}
88
89int BridgeClient::peek() {
90  doBuffer();
91  if (buffered == 0)
92    return -1; // no chars available
93  else
94    return buffer[readPos];
95}
96
97size_t BridgeClient::write(uint8_t c) {
98  if (!opened)
99    return 0;
100  uint8_t cmd[] = {'l', handle, c};
101  bridge.transfer(cmd, 3);
102  return 1;
103}
104
105size_t BridgeClient::write(const uint8_t *buf, size_t size) {
106  if (!opened)
107    return 0;
108  uint8_t cmd[] = {'l', handle};
109  bridge.transfer(cmd, 2, buf, size, NULL, 0);
110  return size;
111}
112
113void BridgeClient::flush() {
114}
115
116uint8_t BridgeClient::connected() {
117  if (!opened)
118    return false;
119  // Client is "connected" if it has unread bytes
120  if (available())
121    return true;
122
123  uint8_t cmd[] = {'L', handle};
124  uint8_t res[1];
125  bridge.transfer(cmd, 2, res, 1);
126  return (res[0] == 1);
127}
128
129int BridgeClient::connect(IPAddress ip, uint16_t port) {
130  String address;
131  address.reserve(18);
132  address += ip[0];
133  address += '.';
134  address += ip[1];
135  address += '.';
136  address += ip[2];
137  address += '.';
138  address += ip[3];
139  return connect(address.c_str(), port);
140}
141
142int BridgeClient::connect(const char *host, uint16_t port) {
143  uint8_t tmp[] = {
144    'C',
145    static_cast<uint8_t>(port >> 8),
146    static_cast<uint8_t>(port)
147  };
148  uint8_t res[1];
149  int l = bridge.transfer(tmp, 3, (const uint8_t *)host, strlen(host), res, 1);
150  if (l == 0)
151    return 0;
152  handle = res[0];
153
154  // wait for connection
155  uint8_t tmp2[] = { 'c', handle };
156  uint8_t res2[1];
157  while (true) {
158    bridge.transfer(tmp2, 2, res2, 1);
159    if (res2[0] == 0)
160      break;
161    delay(1);
162  }
163  opened = true;
164
165  // check for successful connection
166  if (connected())
167    return 1;
168
169  stop();
170  handle = 0;
171  return 0;
172}
173
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