#pragma once

#include <hwo/chksum.h>
#include <sys/threads.h>

/***********************************
	rb2/regbus.h
	
	RegisteredBus2

	Paketorientierte Kommunikation via Serielle Verbindungen mit Adressierung

Paketformat ähnelt ServiceLink:

	Byte	Inhalt
	0		Magic		0x77
	1		empfänger
	2		sender
	3		flags	
	
	!flags.ident:
	4..5	register
	6..9	value
	flags.ident:
	4..5	endpunktmaske
	6		achse
	7..9	reserve
	
	Alle:
	10..11	CHKSUM (SUM+XOR)
	
	
***********************************/

struct	_rb2_addr;
struct	_rb2_telegram;
union	_rb2_flags;
struct	_rb2_request;
struct	_rb2_listed_telegram;

typedef struct	_rb2_addr		RB2_ADDR;
typedef struct	_rb2_telegram	RB2_TELEGRAM;
typedef union	_rb2_flags		RB2_FLAGS;
typedef struct	_rb2_request	RB2_REQUEST;

typedef struct	_rb2_telegram	rb2_telegram_t;
typedef struct	_rb2_telegram_buffer
								rb2_telegram_buffer_t;


#define RB2_ADDR(ptr)			((RB2_ADDR*)(ptr))
#define RB2_TELEGRAM(ptr)		((RB2_TELEGRAM*)(ptr))
#define RB2_FLAGS(ptr)			((RB2_FLAGS*)(ptr))
#define RB2_REQUEST(ptr)		((RB2_REQUEST*)(ptr))
#define rb2_telegram_buffer_t(ptr)	((rb2_telegram_buffer_t*)(ptr))

struct _rb2_addr
{
	union
	{
		struct
		{
			uint8_t		ax:4;
			uint8_t		node:4;
		};
		uint8_t	addr;
	};
};

union	_rb2_flags
{
	struct 
	{
		uint8_t		ident:1;		// 1 = Ident Paket, 0 = Request/Response
		uint8_t		response:1;		// 1 = Antwort auf Request, 0 = Request
		uint8_t		read:1;			// 1 = Wert Lesen, 0 = Wert Schreiben
		uint8_t		fail:1;			// 1 = Anfrage fehlgeschlagen
		
		uint8_t		type:4;			// 0 = Wert als Int32, 1 = Wert als float,...
	};
	uint8_t	byte;
};

struct _rb2_telegram
{
	uint8_t		magic;
	RB2_ADDR	receiver;
	RB2_ADDR	sender;
	RB2_FLAGS	flags;
	union
	{
		struct	// flags.ident = 0
		{
			uint16_t	regno;
			union
			{
				int32_t		i32;
				float		f32;
				uint32_t	ui32;
			};
		};
		struct	// flags.ident = 1
		{
			uint16_t	endpoints;
			uint8_t		ax;
		};
	};
	CHKSUM	chksum;
};


struct _rb2_telegram_buffer {
	list_t		list;
	
	rb2_link_t	*link;
	
	union {
		rb2_telegram_t	telegram;
		unsigned char	bytes[ sizeof( rb2_telegram_t ) ];
	};
	
};

struct _rb2_request
{
	list_t	list;
	
	uint8_t			autofree:1;

	THREAD			*waiter;
	RB2_TELEGRAM	telegram;
};

typedef struct _rb2_request rb2_request_t;