#include <msp430.h>

//=======================================================================================
// Variables
//=======================================================================================
int adc[10] = {0};				//Sets up an array of 10 integers and zero's the values
int avg_adc = 0;
volatile int bit;
volatile int i,n,first,second, zeroth;
float temp;
float degF;
float longfirst;


//=======================================================================================
// Initializations for testing and proper debugging 
//=======================================================================================
void adc_Setup();
void adc_Sam10();
void Initialize();
void Writecom();
void Writedata();
void Temperature();

//=======================================================================================
// ADC10 interrupt service routine
//=======================================================================================
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
	__bic_SR_register_on_exit(CPUOFF);       				// Clear CPUOFF bit from 0(SR)
}

//=======================================================================================
// ADC set-up function
//=======================================================================================
void adc_Setup()
{
	ADC10CTL1 = INCH_10 + ADC10DIV_3;         			// Temp Sensor ADC10CLK/4
	ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;
									// + Interrupt Enable
	ADC10CTL0 |= ENC + ADC10SC;             			// Sampling and conversion start
	__bis_SR_register(CPUOFF + GIE);        			// LPM0 with interrupts enabled
}

//=======================================================================================
// ADC sample conversion function
//=======================================================================================
void adc_Sam10()
{
	ADC10CTL0 &= ~ENC;						// Disable Conversion
	while (ADC10CTL1 & BUSY);					// Wait if ADC10 busy
	ADC10SA = (int)adc;						// Transfers data to next array
	ADC10CTL0 |= ENC + ADC10SC;					// Enable Conversion and conversion start
	__bis_SR_register(CPUOFF + GIE);				// Low Power Mode 0, ADC10_ISR
}

//=======================================================================================
// Initialize
// this is to just set the LCD up for operations
//=======================================================================================
void Initialize(void)
{
	Writecom(0x39);							//function set
	Writecom(0x14);							//internal osc frequency
	Writecom(0x56); 						//power control
	Writecom(0x6D); 						//follower control
	Writecom(0x70); 						//contrast
	Writecom(0x0f); 						//display on
	Writecom(0x06); 						//entry mode
	Writecom(0x01); 						//clear
}

//=======================================================================================
// Writecom
// this is used to initialize the LCD so that we can write data to it to display
// characters using hex values. the LCD only knows the MSP430 is writing to it when CS
// is pulled low. the LCD can only be set up when the RS pin is pulled low as well.
// this is also called to set the proper position of the cursor between the 2 rows.
//=======================================================================================
void Writecom(int d)
{
	P1OUT &=~ BIT1; 						//CS pull down
	P1OUT &=~ BIT2; 						//RS pull down
	for(bit=1; bit<=8; bit++)					//send 8 bits
	{
		if((d&0x80)==0x80) 					//get only the MSB
			P1OUT |= BIT7;					//if 1, then MOSI=1
		else
			P1OUT &=~ BIT7;					//if 0, then MOSI=0
		d=(d<<1); 							//shift data byte left
		P1OUT &=~ BIT5;						//CL (low)
		P1OUT |= BIT5;						//CL (high)
		P1OUT &=~ BIT5;						//CL (low)
	}
	P1OUT |= BIT1;							//CS pull up
}

//=======================================================================================
// Writedata
// this function will be used to actually write characters to the LCD. when the RS pin
// is pulled high then it know that a character is being sent to be displayed.
//=======================================================================================
void Writedata(int d)
{
	P1OUT &=~ BIT1;							//CS pull down
	P1OUT |= BIT2; 							//RS pull up
	for(bit=1; bit<=8; bit++)					//send 8 bits
	{
		if((d&0x80)==0x80)					//get only the MSB
			P1OUT |= BIT7;					//if 1, then MOSI=1
		else
			P1OUT &=~ BIT7;					//if 0, then SI=0
		d=(d<<1); 							//shift data byte left
		P1OUT &=~ BIT5;						//CL (low)
		P1OUT |= BIT5;						//CL (high)
		P1OUT &=~ BIT5;						//CL (low)
	}
	P1OUT |= BIT1;							//CS pull up
}

//=======================================================================================
// Temperature
// Displays the Micro-controller temerature to LCD
//=======================================================================================
void Temperature()
{
	volatile char str[]={'0','1','2','3','4','5','6','7','8','9'};
	Writecom(0x80);					// start row 1 column 1
	Writedata(0x54);				// T
	Writedata(0x65);				// e
	Writedata(0x6D);				// m
	Writedata(0x70);				// p
	Writedata(0x65);				// e
	Writedata(0x72);				// r
	Writedata(0x61);				// a
	Writedata(0x74);				// t
	Writedata(0x75);				// u
	Writedata(0x72);				// r
	Writedata(0x65);				// e


	Writecom(0xc0);					// start row 2 column 1
	zeroth = degF / 100;
	longfirst = degF / 10;
	first = degF / 10;
	second = (longfirst - first) * 10;
	Writedata(str[zeroth]);			//Displays hundredth digit
	Writedata(str[first]);				//Displays tenth digit
	Writedata(str[second]);			//Displays ones digit
	Writedata(0xDF);				//Degree Symbol
	Writedata('F');					//F
}


//=======================================================================================
// main
//=======================================================================================
void main()
{
	WDTCTL = WDTPW + WDTHOLD;					//Stop WDT
	P1DIR |= BIT1+BIT2+BIT5+BIT7+BIT3;
	Initialize();							//Set up LCD
	adc_Setup();							

	while(1)
	{
		P1OUT |= BIT3;						//Set backlight on
		adc_Sam10();						
						
		
		temp = ADC10MEM;
		degF = ((temp - 630) * 761) / 1024;			//Calculate temperature in degrees Fahrenheit 


		__delay_cycles(50000);					//Delay
		Temperature();						//Displays current temperature of micro-controller
	}
}