From 65e4dc58c29f4f2d82caad8190f5e8ca9402b834 Mon Sep 17 00:00:00 2001
From: Gediminas Jakutis <gediminas@varciai.lt>
Date: Thu, 15 Feb 2018 10:33:05 +0200
Subject: tempmodule: make the WiFi off by default and togglable with a button
 interrupt.

---
 src/tempmodule/main.ino | 103 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 86 insertions(+), 17 deletions(-)

(limited to 'src/tempmodule')

diff --git a/src/tempmodule/main.ino b/src/tempmodule/main.ino
index e15cd93..fd7d5d7 100644
--- a/src/tempmodule/main.ino
+++ b/src/tempmodule/main.ino
@@ -22,11 +22,17 @@
 #include <WiFiUdp.h>
 #include <stddef.h>
 #include <string.h>
+#include <limits.h>
 #include "indicator.h"
 #include "temperature.h"
 
-static const unsigned int iled = 2;
+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};
@@ -39,43 +45,58 @@ 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 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)
 {
-	static const char * const ssid = "SSID";
-	static const char * const password = "password";
-
 	pinMode(iled, OUTPUT);
+	pinMode(wifiled, OUTPUT);
+	pinMode(wifibutton, INPUT);
 	indicator_init(0, NULL);
-	wifi_connect(ssid, password, 1, iled);
-	Udp.begin(port);
-	discover_client();
+	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;
-	char *dataptr;
 	size_t i;
 
-
 	udp_init_packet(ip, port);
 
-	data = 0;
-	dataptr = (char*) &data;
-	udp_push(&data, sizeof(data));
-	udp_push(&ticker, sizeof(ticker));
+	if (wifidesired && !wifistate) {
+		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));
-	udp_push(&data, sizeof(data));
 
-	if (!(udp_flush())) {
-		Udp.stop();
-		sleep();
+	if (wifistate) {
+		udp_push(&data, sizeof(data));
+
+		if (!(udp_flush())) {
+			Udp.stop();
+			sleep();
+		}
 	}
 
 	indicator_update(data);
@@ -111,6 +132,9 @@ static int udp_flush(void)
 
 static void 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 {
@@ -120,6 +144,16 @@ static void wifi_connect(const char * const ssid, const char * const password, c
 			delay (500);
 		}
 	} while (WiFi.status() != WL_CONNECTED);
+
+	wifistate = 1;
+}
+
+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)
@@ -155,3 +189,38 @@ static void discover_client(void)
 		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;
+}
-- 
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