/* H7 -projekt opgave */

///////////////////////////////////////////////////////////////////////
//Includes
#include <pic18.h>
#include "delay.h"
#include "i2c.h"
#include "lcd.h"

/////////////////////////////////////////////////////////////////////
//Defines
#define TC74 0x9A /* I2C TC74 IC */

//////////////
// Enums

enum SlipState{
	SlipNormal,
	SlipEscaped,
	SlipError,
	SlipStopped
};

//////////////////////////////////////////////////////////////////
//Globale data
// Alle globale variabler bruger "global_" som prefix
unsigned char global_comm_buffer[10]; 
unsigned char global_comm_length;
unsigned char global_comm_index;
bit global_comm_ready;
bit global_comm_recieving;

unsigned char global_comm_state;



///////////////////////////////////////////////////////////////////
// Interrupt funktioner

void recieve_interrupt(void)
{
}

void transmit_interrupt(void)
{
}

void interrupt interrupt_handler(void)
{
	if (RCIF == 1)
	{
		recieve_interrupt();
		RCIF = 0;
	}
	if (TXIF == 1)
	{
		transmit_interrupt();
		TXIF = 0;
	}
}

///////////////////////////////////////////////////////////////////
// Alm funktioner

void interrupt_init(void)
{
	TXIE = 1; //Enable AUX TX interrupt - testes med TXIF;
	RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF;

	IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet
	
	PEIE = 1; // PEIE = PEriphal Interrupt Enable
		
	TXIF = 0; //nulstil intterupt flag
	RCIF = 0;

	GIE = 1; //Global interrupt enable bit
}

void serial_init(void)
{
	SPEN = 0; //Make sure serial port is disabled
	
	// snupset fra  Kim H Pedersens serialmain.c 
	// Set Port C bit 6 output (TxD) and bit 7 input (RxD)
    TRISC6 = 0;
    TRISC7 = 1;

    SPBRG = 25;		//	x = Fosc/(16 * Baud Rate) - 1
					//	x = 4000000/(16 * 9600) - 1
					//	x = 25.0417 ~ 25
					//	Baud Rate = Fosc/(16 * (x+1))
					//	Baud Rate = 4000000/(16 * (25+1))
					//	Baud Rate = 9615
    TXSTA = 0x24;	//	TXSTA7 = 0	Don't care in asynchronous
					//	TXSTA6 = 0	8-bit transmission
					//	TXSTA5 = 1	Transmit enabled
					//	TXSTA4 = 0	Asynchronous mode
					//	TXSTA3 = 0	Unimplemented
					//	TXSTA2 = 1	High speed
					//	TXSTA1 = 0	TSR empty
					//	TXSTA0 = 0	9th bit						*/
    RCSTA = 0x90;	//	RCSTA7 = 0	Serial port disabled
					//	RCSTA6 = 0	8-bit reception
					//	RCSTA5 = 0	Don't care in asynchronous
					//	RCSTA4 = 1	Receiver enabled
					//	RCSTA3 = 0	Don't care (8-bit operation)
					//	RCSTA2 = 0	No framing error
					//	RCSTA1 = 0	Overrun error bit
					//	RCSTA0 = 0	9th bit						*/
					
	//config completed
	SPEN = 1; //Enable Serial port
}



void i2c_init(void)
{
#ifdef I2C_MODULE
    SSPMode(MASTER_MODE);
    SSPEN = 1;
    CKP = 1;
#else
    SCL_DIR = I2C_OUTPUT;
    SDA_DIR = I2C_OUTPUT;
    SDA = 0;
    SCL = 0;
#endif
}



char ReadTemp(void)
{
	char temp;
	i2c_WriteTo(TC74); //write to, will automatically send a start condition
	i2c_PutByte(0x00); //tell TC74 we want to read
	i2c_ReadFrom(TC74);
	temp = i2c_GetByte(I2C_LAST);
	i2c_Stop(); //assert a stop condition on SDA & SCL
	return temp;
}


///////////////////////////////////////////////////////////////////
//Main


void main(void) 
{
	lcd_init(0); //init in 4-bit mode
	i2c_init();
	serial_init(); //9600 8N1
	
	interrupt_init();
	
	global_comm_length = 0;
	global_comm_ready = 0;


	global_comm_state = SlipNormal;
	
//	initialisation completed and we are ready to recieve commands - enable serial reception
	CREN = 1;
	
	while (1)
	{
	}
}