[FL-1059] T5577 write (#463)

* Api-hal-gpio: extend init functions
* App Lfrfid: separate protocol layer
* App Lfrfid: write EM key scene
* App Lfrfid: syntax fix

applications/lf-rfid/helpers/protocols/protocol-generic.h

@@ -0,0 +1,60 @@
+#pragma once
+#include "stdint.h"
+#include "stdbool.h"
+
+class ProtocolGeneric {
+public:
+    /**
+     * @brief Get the encoded data size
+     * 
+     * @return uint8_t size of encoded data in bytes
+     */
+    virtual uint8_t get_encoded_data_size() = 0;
+
+    /**
+     * @brief Get the decoded data size
+     * 
+     * @return uint8_t size of decoded data in bytes
+     */
+    virtual uint8_t get_decoded_data_size() = 0;
+
+    /**
+     * @brief encode decoded data
+     * 
+     * @param decoded_data 
+     * @param decoded_data_size 
+     * @param encoded_data 
+     * @param encoded_data_size 
+     */
+    virtual void encode(
+        const uint8_t* decoded_data,
+        const uint8_t decoded_data_size,
+        uint8_t* encoded_data,
+        const uint8_t encoded_data_size) = 0;
+
+    /**
+     * @brief decode encoded data
+     * 
+     * @param encoded_data 
+     * @param encoded_data_size 
+     * @param decoded_data 
+     * @param decoded_data_size 
+     */
+    virtual void decode(
+        const uint8_t* encoded_data,
+        const uint8_t encoded_data_size,
+        uint8_t* decoded_data,
+        const uint8_t decoded_data_size) = 0;
+
+    /**
+     * @brief fast check that data can be correctly decoded
+     * 
+     * @param encoded_data 
+     * @param encoded_data_size 
+     * @return true - can be correctly decoded
+     * @return false - cannot be correctly decoded
+     */
+    virtual bool can_be_decoded(const uint8_t* encoded_data, const uint8_t encoded_data_size) = 0;
+
+    virtual ~ProtocolGeneric(){};
+};