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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* An unnamed project – esp8266 module
*
* Copyright (C) 2017 Gediminas Jakutis
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1
* of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <stddef.h>
#include <string.h>
#include <limits.h>
#include "indicator.h"
#include "temperature.h"
static const unsigned int iled = 2; /* D4 */
static const unsigned int wifiled = 12; /* D6 */
static const unsigned int wifibutton = 13; /* D7 */
static const unsigned int analog = A0;
static volatile unsigned int wifidesired = 0;
static unsigned int wifistate = 0;
static unsigned int wifiledstate = 0;
static const int port = 2191;
static const int splitter_res = 4699;
static char udppacketbuffer[32] = {0};
static char *udppacketcursor = NULL;
IPAddress ip;
WiFiUDP Udp;
static void sleep(void);
static void udp_init_packet(IPAddress ip, const int port);
static void udp_push(const void * const data, const size_t size);
static int udp_flush(void);
static int wifi_connect(const char * const ssid, const char * const password, const char doblink, const int ledpin);
static void wifi_disconnect(void);
static void blink_led(const int pin, const int ontime, const int offtime);
static void discover_client(void);
void toggle_wifi(void);
void wifiled_toggle(void);
void setup(void)
{
pinMode(iled, OUTPUT);
pinMode(wifiled, OUTPUT);
pinMode(wifibutton, INPUT);
indicator_init(0, NULL);
WiFi.forceSleepBegin();
attachInterrupt(digitalPinToInterrupt(wifibutton), toggle_wifi, RISING);
}
void loop(void)
{
static const char * const ssid = "SSID";
static const char * const password = "password";
static unsigned int ticker = 0;
short int data;
size_t i;
udp_init_packet(ip, port);
if (wifidesired && !wifistate) {
if (!wifi_connect(ssid, password, 1, iled)) {
Udp.begin(port);
discover_client();
}
}
if (!wifidesired && wifistate) {
wifi_disconnect();
}
if (wifistate) {
data = 0;
udp_push(&data, sizeof(data));
udp_push(&ticker, sizeof(ticker));
}
data = analogRead(analog);
data = get_temperature(get_resistance(data, splitter_res));
if (wifistate) {
udp_push(&data, sizeof(data));
if (!(udp_flush())) {
Udp.stop();
sleep();
}
}
indicator_update(data);
delay(1000);
++ticker;
}
static void sleep(void)
{
do {
blink_led(iled, 3000, 3000);
} while (1);
}
static void udp_init_packet(IPAddress ip, const int port)
{
Udp.beginPacket(ip, port);
memset(udppacketbuffer, 0, sizeof(udppacketbuffer));
udppacketcursor = udppacketbuffer;
}
static void udp_push(const void * const data, const size_t size)
{
memcpy(udppacketcursor, data, size);
udppacketcursor += size;
}
static int udp_flush(void)
{
Udp.write((const uint8_t *) udppacketbuffer, udppacketcursor - udppacketbuffer);
return Udp.endPacket();
}
static int wifi_connect(const char * const ssid, const char * const password, const char doblink, const int ledpin)
{
wifiled_toggle();
WiFi.forceSleepWake();
WiFi.begin(ssid, password);
do {
if (doblink) {
blink_led(ledpin, 250, 250);
} else {
delay (500);
}
/* in case the wifi off interrupt gets triggered while trying to connect */
if (!wifidesired) {
wifi_disconnect();
return 1;
}
} while (WiFi.status() != WL_CONNECTED);
wifistate = 1;
return 0;
}
static void wifi_disconnect(void)
{
wifiled_toggle();
WiFi.disconnect(1);
WiFi.forceSleepBegin();
wifistate = 0;
}
static void blink_led(const int pin, const int ontime, const int offtime)
{
digitalWrite(pin, HIGH);
delay(ontime);
digitalWrite(pin, LOW);
delay(offtime);
}
static void discover_client(void)
{
IPAddress bcastip(255, 255, 255, 255);
static const char servermagic[] = "I love coffee!";
static const char clientmagic[] = "I love tea!";
char buffer[32] = {0};
size_t done = 0;
do {
udp_init_packet(bcastip, port);
udp_push(servermagic, sizeof(servermagic));
udp_flush();
delay(5);
while (Udp.parsePacket()) {
if (Udp.available() >= sizeof(clientmagic)) {
Udp.read(buffer, sizeof(clientmagic));
if (!(strcmp(clientmagic, buffer))) {
ip = Udp.remoteIP();
++done;
}
}
}
delay(95);
} while (!done);
}
void toggle_wifi(void)
{
static const unsigned int timeout = 2000000; /* 2 seconds */
static volatile unsigned int lastswitch;
volatile unsigned int switchtime;
switchtime = micros();
/* if the value overflowed */
if (switchtime < lastswitch) {
if ((UINT_MAX - lastswitch + timeout) > switchtime) {
return;
}
/* if the value overflows if we add 2 seconds */
} else if ((lastswitch + timeout) < lastswitch) {
if (lastswitch + timeout > switchtime || lastswitch < switchtime) {
return;
}
}
lastswitch = switchtime;
wifidesired = !wifidesired;
}
void wifiled_toggle(void)
{
if (wifiledstate) {
digitalWrite(wifiled, LOW);
} else {
digitalWrite(wifiled, HIGH);
}
wifiledstate = !wifiledstate;
}
|
