//======================================================================
// iopcomm.h
//======================================================================

#ifndef __iopcomm_h__
#define __iopcomm_h__

#include <stdint.h>

/* Message prefixes, starting with the ACK message (0).  Message format
 * consists of 1 or more bytes, where:
 * 	b[0] - leftmost 3 bits == prefix
 *       - rightmost 5 bits == length of data (0-31)
 *  b[1]...b[31] (if present) - data bits
 */

enum PrefixID {
	ACK = 0,
	CAT_PREFIX,
	IOP_PREFIX,
	RAD_EEPROM_READ_PREFIX,
	RAD_EEPROM_WRITE_PREFIX,
	IOP_EEPROM_READ_PREFIX,
	IOP_EEPROM_WRITE_PREFIX,
	NUM_PREFIX_IDS
};

/* Masks for the leftmost 3 bits (prefix) and rightmost 5 bits (length)
 * of a message.
 */

#define PREFIX_MASK 0xE0
#define LENGTH_MASK 0x1F

/* Convert a prefix and length to a byte, by shifting the prefix left
 * 5 bits and OR-ing with the 5 bits of length.
 */

inline uint8_t prefixAndLengthToByte(PrefixID id, uint8_t len)
{
	return (uint8_t(id) << 5) | (len & LENGTH_MASK);
}

/* Extract the prefix (leftmost 3 bits) from a byte.
 */
 
inline PrefixID byteToPrefix(uint8_t b)
{
	return PrefixID(b >> 5);
}

/* Extract the length (rightmost 5 bits) from a byte.
 */
 
inline uint8_t byteToLength(byte b)
{
	return uint8_t(b & LENGTH_MASK);
}

/* Message IDs/types, for IOP messages (messages between the Raduino and
 * the IOP, not including CAT messages to be passed through).
 */

enum MessageID {
	// Commands
	IOP_MODE_COMMAND = 0,
	IOP_START_TX_COMMAND,
	IOP_STOP_TX_COMMAND,
    IOP_CW_CONFIG_MSG,
    
    // Requests
    IOP_MODE_REQUEST,
    IOP_SSB_STATUS_MSG,
    IOP_DIGI_STATUS_MSG,
    IOP_CW_STATUS_MSG,
    IOP_TEST_STATUS_MSG,
    
    // add any new elements here
    NUM_MESSAGE_IDS
};

/* Max length of an IOP message payload (data), based on the following 
 * message format:
 * 
 * byte 0: prefix (3 bits) + length (5 bits)
 * byte 1: message ID (type)
 * bytes 2-31: data bytes
 */

#define IOP_MESSAGE_MAX_LEN	30

/* Rig modes.  Currently just defined as what the IOP cares about, but
 * maybe these need to be expanded to encompass all of the rig modes.
 * (e.g. USB, LSB, etc.)
 */

enum RigMode {
  RIG_MODE_SSB = 0,
  RIG_MODE_DIGI,
  RIG_MODE_CW,
  RIG_MODE_TEST,
  // add any new elements here
  NUM_RIG_MODES
};

/* Keyer modes.
 */
 
enum KeyerMode {
  KEYER_MODE_STRAIGHT = 0,
  KEYER_MODE_IAMBIC_A,
  KEYER_MODE_IAMBIC_B,
  //KEYER_ULTIMATIC,
  //KEYER_BUG,
  // add any new elements here
  NUM_KEYER_MODES
};

enum RxFilter {
	RX_FILTER_NORMAL = 0,
	RX_FILTER_NARROW,
	RX_FILTER_WIDE,
	NUM_RX_FILTERS
};

const unsigned char RIG_MODE_LETTER[NUM_RIG_MODES] = {'S', 'D', 'C', 'T'};
const unsigned char KEYER_MODE_LETTER[NUM_KEYER_MODES] = {'S', 'A', 'B'};
const unsigned char RX_FILTER_LETTER[NUM_RX_FILTERS] = {'-', 'N', 'W'};

const uint8_t NO_FLAGS = 0;
const uint8_t REVERSED = 1;

struct IOPMessage {
  uint8_t id;
  uint8_t len;
  uint8_t data[IOP_MESSAGE_MAX_LEN];
};

//======================================================================
// SSB CONFIGURATION
//======================================================================

struct SSBConfig {
	// parameters
	RxFilter filter		= RX_FILTER_NORMAL;
};

//======================================================================
// DIGI CONFIGURATION
//======================================================================

struct DigiConfig {
	// parameters
	RxFilter filter		= RX_FILTER_NORMAL;
};

//======================================================================
// CW CONFIGURATION
//======================================================================

struct CWConfig {
	// mode
	KeyerMode mode       = KEYER_MODE_IAMBIC_A;
	// flags
	bool      reversed   = false;
	// parameters
	uint8_t   wpm        = 15;
	float     weight     = 3.0;
	uint16_t  sidetone   = 700;
	RxFilter  filter	 = RX_FILTER_NORMAL;
};

//======================================================================
// FUNCTION PROTOTYPES
//======================================================================

void sendCATMessage(const uint8_t*);
void sendIOPMessage(IOPMessage const&);
void recvIOPMessage(IOPMessage&, const uint8_t*, int);

void sendIOPModeCommand(RigMode);
void sendIOPStartTxCommand();
void sendIOPStopTxCommand();

void sendIOPModeRequest();
void sendIOPSSBStatus(SSBConfig const&);
void sendIOPDigiStatus(DigiConfig const&);
void sendIOPCWStatus(CWConfig const&);
void sendIOPTestStatus();

//======================================================================
// TRANSLATOR
//======================================================================

/*
class Translator
{
	public:
	Translator(RigMode&, CWConfig&, Stream&);
	
	void registerPrefixCb(PrefixID id, void (*func)(void*));
	void registerMessageCb(MessageID id, void (*func)(void*));
	
	void sendACK();
	void sendIOPMessage(IOPMessage const&);
	
	void receive();
	
	void pack_ModeCommand(IOPMessage&, RigMode);
	void pack_CWConfig(IOPMessage&, CWConfig const&);
	void pack_ModeRequest(IOPMessage&);
	
	void unpack(IOPMessage const&);
	
	protected:
	void unpack_ModeCommand(IOPMessage const&);
	void unpack_CWConfig(IOPMessage const&);	
	void unpack_ModeRequest(IOPMessage const&);
		
	private:
	RigMode& mode;
	CWConfig& cwConfig;
	Stream& serial;

	void (*prefixCb[NUM_PREFIX_IDS])(void*);
	void (*messageCb[NUM_MESSAGE_IDS])(void*);
};
*/

#endif

//======================================================================
// EOF
//======================================================================