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/*
* 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 <Wire.h>
#include <stddef.h>
#include <string.h>
static const unsigned int iled = 2;
static const unsigned int analog = A0;
static const int port = 2191;
static const int mpu_addr = 0x68;
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 void mpu_wakeup(const int i2caddr);
static void wifi_connect(const char * const ssid, const char * const password, const char doblink, const int ledpin);
static void blink_led(const int pin, const int ontime, const int offtime);
static void discover_client(void);
static void discard(int a);
void setup(void)
{
static const char * const ssid = "SSID";
static const char * const password = "password";
pinMode(iled, OUTPUT);
wifi_connect(ssid, password, 1, iled);
Udp.begin(port);
Wire.begin();
mpu_wakeup(mpu_addr);
discover_client();
}
void loop(void)
{
static unsigned int ticker = 0;
static unsigned char firstrun = 0;
short int data;
char *dataptr;
size_t i;
Wire.beginTransmission(mpu_addr);
Wire.write(0x3b);
Wire.endTransmission(0);
Wire.requestFrom(mpu_addr, 14, 1);
udp_init_packet(ip, port);
dataptr = (char*) &data;
data = 0;
udp_push(&data, sizeof(data));
udp_push(&ticker, sizeof(ticker));
for (i = 0; i < 7; ++i) {
if (i == 3) {
dataptr[1] = Wire.read();
dataptr[0] = Wire.read();
udp_push(&data, sizeof(data));
} else {
discard(Wire.read());
}
}
data = analogRead(analog);
udp_push(&data, sizeof(data));
if (!(udp_flush())) {
Udp.stop();
sleep();
}
blink_led(iled, 20, 80);
++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 void mpu_wakeup(const int i2caddr)
{
Wire.beginTransmission(i2caddr);
Wire.write(0x6b);
Wire.write(0);
Wire.endTransmission(1);
}
static void wifi_connect(const char * const ssid, const char * const password, const char doblink, const int ledpin)
{
WiFi.begin(ssid, password);
do {
if (doblink) {
blink_led(ledpin, 250, 250);
} else {
delay (500);
}
} while (WiFi.status() != WL_CONNECTED);
}
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);
}
static void discard(int a)
{
return;
}
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