Naming and coding style convention, new linter tool. (#945)

* Makefile, Scripts: new linter
* About: remove ID from IC
* Firmware: remove double define for DIVC/DIVR
* Scripts: check folder names too. Docker: replace syntax check with make lint.
* Reformat Sources and Migrate to new file naming convention
* Docker: symlink clang-format-12 to clang-format
* Add coding style guide

applications/ibutton/helpers/metakom_decoder.h

@@ -0,0 +1,54 @@
+#pragma once
+#include <stdint.h>
+#include <atomic>
+
+class MetakomDecoder {
+public:
+    bool read(uint8_t* data, uint8_t data_size);
+    void process_front(bool polarity, uint32_t time);
+
+    MetakomDecoder();
+
+private:
+    enum class BitState : uint8_t {
+        WAIT_FRONT_HIGH,
+        WAIT_FRONT_LOW,
+    };
+
+    BitState bit_state;
+
+    enum class State : uint8_t {
+        WAIT_PERIOD_SYNC,
+        WAIT_START_BIT,
+        WAIT_START_WORD,
+        READ_WORD,
+        READ_STOP_WORD,
+    };
+
+    State state;
+
+    // high + low period time
+    uint32_t period_time;
+    uint32_t low_time_storage;
+
+    static const uint8_t period_sample_count = 10;
+    uint8_t period_sample_index;
+    uint32_t period_sample_data[period_sample_count];
+
+    // ready flag, key is readed and valid
+    std::atomic<bool> ready;
+
+    // max period, 230us x clock per us
+    uint32_t max_period;
+
+    uint8_t tmp_data;
+    uint8_t tmp_counter;
+
+    uint32_t key_data;
+    uint8_t key_data_index;
+
+    void reset_state();
+    bool parity_check(uint8_t data);
+
+    bool process_bit(bool polarity, uint32_t time, uint32_t* high_time, uint32_t* low_time);
+};