From d29f76fa7ccc6f907edc674017ce9734f21bc537 Mon Sep 17 00:00:00 2001
From: "Pawel Spychalski (DzikuVx)" <pspychalski@gmail.com>
Date: Sat, 28 Oct 2017 16:55:48 +0200
Subject: [PATCH] buzzer processing code

---
 buzzer.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 buzzer.h | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 buzzer.c
 create mode 100644 buzzer.h

diff --git a/buzzer.c b/buzzer.c
new file mode 100644
index 0000000..59c28b9
--- /dev/null
+++ b/buzzer.c
@@ -0,0 +1,48 @@
+#include "Arduino.h"
+#include "buzzer.h"
+
+void buzzerProcess(uint8_t pin, uint32_t timestamp, BuzzerState_t *buzzer)
+{
+
+    if (!buzzer->enabled)
+    {
+        digitalWrite(pin, LOW);
+        return;
+    }
+
+    if (timestamp > buzzer->updateTime)
+    {
+
+        int8_t currentPattern = buzzer->pattern[buzzer->mode][buzzer->element];
+
+        if (currentPattern == PATTERN_CYCLE_OFF)
+        {
+            digitalWrite(pin, LOW);
+        }
+        else if (currentPattern == PATTERN_CYCLE_ON)
+        {
+            digitalWrite(pin, HIGH);
+        }
+        else if (currentPattern == PATTERN_CYCLE_IGNORE || currentPattern == buzzer->tick)
+        {
+
+            if (currentPattern != PATTERN_CYCLE_IGNORE)
+            {
+                digitalWrite(pin, !digitalRead(pin));
+            }
+
+            buzzer->element++;
+            if (buzzer->element == PATTERN_ELEMENT_NUMBER)
+            {
+                buzzer->element = 0;
+            }
+        }
+
+        buzzer->tick++;
+        if (buzzer->tick >= buzzer->patternMaxTick)
+        {
+            buzzer->tick = 0;
+        }
+        buzzer->updateTime = timestamp + buzzer->patternTickPerdiod;
+    }
+};
\ No newline at end of file
diff --git a/buzzer.h b/buzzer.h
new file mode 100644
index 0000000..ec09b37
--- /dev/null
+++ b/buzzer.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include "Arduino.h"
+
+#define PATTERN_CYCLE_OFF 127
+#define PATTERN_CYCLE_ON -1
+#define PATTERN_CYCLE_IGNORE -2
+
+#define PATTERN_MODES_NUMBER 6
+#define PATTERN_ELEMENT_NUMBER 4
+
+enum {
+    BUZZER_MODE_OFF = 0,
+    BUZZER_MODE_CONTINUOUS = 1,
+    BUZZER_MODE_SLOW_BEEP = 2,
+    BUZZER_MODE_FAST_BEEP = 3,
+    BUZZER_MODE_CHIRP = 4,
+    BUZZER_MODE_DOUBLE_CHIRP = 5
+};
+
+struct BuzzerState_t {
+    bool enabled = true;
+    uint8_t mode = BUZZER_MODE_DOUBLE_CHIRP;
+    
+    uint32_t updateTime = 0;
+
+    uint8_t tick = 0;
+    uint8_t element = 0;
+    const uint8_t patternMaxTick = 20;
+    const uint8_t patternTickPerdiod = 100;
+
+    const int8_t pattern[PATTERN_MODES_NUMBER][PATTERN_ELEMENT_NUMBER] = {
+        {PATTERN_CYCLE_OFF},
+        {PATTERN_CYCLE_ON},
+        {0, 7, 10, 17},
+        {0, 4, 10, 14},
+        {0, 1, 10, 11},
+        {0, 1, 2, 3}
+    };
+
+};
+
+void buzzerProcess(uint8_t pin, uint32_t timestamp, BuzzerState_t *buzzer);
\ No newline at end of file