/*
* Copyright (c) by BlackMark 2015-2016
* Date 26/05/2016
* Version 3.3
*/

#ifndef USART_H
#define USART_H

#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdint.h>
#include <string.h>
#include "clock.h"

#if defined (__AVR_ATmega168A__) || defined (__AVR_ATmega328P__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega1284P__)
#define USART_SPI
#define USART0_RX_vect_D USART_RX_vect
#define USART0_UDRE_vect_D USART_UDRE_vect
#endif
#if defined (__AVR_ATmega32A__) || (__AVR_ATmega8__)
#define USART_SHAREDIO
#define USART0_RX_vect_D USART_RXC_vect
#define USART0_UDRE_vect_D USART_UDRE_vect
#endif
#if defined (__AVR_ATmega1284P__)
#define SECOND_USART
#define USART0_RX_vect_D USART0_RX_vect
#define USART1_RX_vect_D USART1_RX_vect
#define USART0_UDRE_vect_D USART0_UDRE_vect
#define USART1_UDRE_vect_D USART1_UDRE_vect
#endif

#ifdef USART_SHAREDIO
#define RXEN_D RXEN
#define TXEN_D TXEN
#define RXCIE_D RXCIE
#define UDRIE_D UDRIE
#define UCSZ0_D UCSZ0
#define UCSZ1_D UCSZ1
#define UCSZ2_D UCSZ2
#define UPM0_D UPM0
#define UPM1_D UPM1
#define USBS_D USBS
#define RXC_D RXC
#define UDRE_D UDRE
#else
#define RXEN_D RXEN0
#define TXEN_D TXEN0
#define RXCIE_D RXCIE0
#define UDRIE_D UDRIE0
#define UCSZ0_D UCSZ00
#define UCSZ1_D UCSZ01
#define UCSZ2_D UCSZ02
#define UPM0_D UPM00
#define UPM1_D UPM01
#define USBS_D USBS0
#define RXC_D RXC0
#define UDRE_D UDRE0
#endif

#ifdef USART_SPI
#define UMSEL0_D UMSEL00
#define UMSEL1_D UMSEL01
#else
#define UMSEL_D UMSEL
#endif

class USART0
{
public:
	enum class Mode
	{
		ASYNCHRONOUS = 0,
		SYNCHRONOUS = 1,
#ifdef USART_SPI
		MASTERSPI = 2
#endif
	};

	enum class Parity
	{
		DISABLED = 0,
		ODD = 1,
		EVEN = 2
	};

	enum class StopBit
	{
		ONE = 1,
		TWO = 2
	};

	static constexpr size_t sm_sizeRXBUFFER_SIZE = 16;
	static constexpr size_t sm_sizeTXBUFFER_SIZE = 16;

protected:
	volatile uint8_t *m_vui8pUCSRA;
	volatile uint8_t *m_vui8pUCSRB;
	volatile uint8_t *m_vui8pUCSRC;
	volatile uint8_t *m_vui8pUBRRH;
	volatile uint8_t *m_vui8pUBRRL;
	volatile uint8_t *m_vui8pUDR;

	volatile size_t m_vsizeRXBufferHead;
	volatile size_t m_vsizeRXBufferTail;
	volatile size_t m_vsizeTXBufferHead;
	volatile size_t m_vsizeTXBufferTail;

	volatile uint8_t m_vui8aRXBuffer[sm_sizeRXBUFFER_SIZE];
	volatile uint8_t m_vui8aTXBuffer[sm_sizeTXBUFFER_SIZE];

	USART0();

private:
	static USART0 sm_cInstance;

	uint8_t readUCSRC();
	void setUCSRC( uint8_t ui8UCSRC );

	void setRXState( bool bEnable );
	void setTXState( bool bEnable );
	void setRXInterrupt( bool bEnable );
	void setUDREInterrupt( bool bEnable );
	void setBaudRate( uint32_t ui32BaudRate );
	void setDataBits( uint8_t ui8DataBits );
	void setParity( Parity enmParity );
	void setStopBits( StopBit enmStopBits );
	void setMode( Mode enmMode );

	uint32_t getBaudRate();
	uint8_t getDataBits();
	Parity getParity();
	StopBit getStopBits();

	~USART0();

public:
	static USART0& inst();
	USART0( const USART0& ) = delete;
	void operator=( const USART0& ) = delete;

	void init( uint32_t ui32BaudRate = 9600, uint8_t ui8DataBits = 8, Parity enmParity = Parity::DISABLED, StopBit enmStopBits = StopBit::ONE, Mode enmMode = Mode::ASYNCHRONOUS );

	bool receiveByte( uint8_t &ui8Data );
	bool receiveByte( uint8_t &ui8Data, uint16_t ui16TimeoutMS );
	uint8_t receiveByteBlocked();
	uint8_t receivePeek();
	bool receiveLine( char *szBuffer, size_t sizeBufferLength, const char *szLineTerminator = "\r\n" );
	bool receiveLine( char *szBuffer, size_t sizeBufferLength, uint16_t ui16TimeoutMS, const char *szLineTerminator = "\r\n" );
	void flushReceive();

	void transmitByte( uint8_t ui8Data );
	void transmitString( const char *szString );
	void flushTransmit();

	void receiveInterruptHandler();
	void transmitInterruptHandler();

	inline USART0& operator<<( const char *szString )
	{
		transmitString( szString );
		return *this;
	}
};

#ifdef SECOND_USART

class USART1 : public USART0
{
public:
	static USART1& inst();
	USART1( const USART1& ) = delete;
	void operator=( const USART1& ) = delete;

private:
	static USART1 sm_cInstance;

	USART1();
};

#endif

#endif