add button stuff and timer stuff

src/eggTimer.c

@@ -0,0 +1,49 @@
+/*
+ * eggTimer.c
+ *
+ *  Created on: 08.09.2016
+ *      Author: dehottgw
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "eggTimer.h"
+#include "displayMuxer.h"
+#include "button.h"
+
+
+const uint32_t EGG_TIMER_CYCLE = 1000;
+
+const uint8_t COOKING_TIME = 120;
+uint8_t restCookingTime;
+bool timerRunning;
+bool timerStarted;
+
+void eggTimerInit(void *handleArg) {
+  restCookingTime = COOKING_TIME;
+  timerRunning = false;
+  timerStarted = false;
+  buttonRegister(eggTimerStart, NULL, BUTTON_START_TIMER);
+}
+
+void eggTimerExec(void *handleArg) {
+  if (timerRunning) {
+    restCookingTime--;
+    displayMuxerSetValue(restCookingTime, true, TIMER_MUX);
+    if (restCookingTime == 0) {
+      // activate alarm
+      timerRunning = false;
+    }
+  }
+}
+
+void eggTimerStart(void *handleArg) {
+  if (! timerStarted) {
+    timerRunning = true;
+    timerStarted = true;
+  }
+}
+
+