#include <msp430.h> 

char data[27][7]={
		{0X00,0X00,0Xff,0X09,0X09,0Xff,0x00}, 	//a
		{0x00,0xff,0x89,0x89,0x89,0xfe,0x00}, 	//b
		{0x00,0x00,0x7e,0x81,0x81,0x01,0x00}, 	//c
		{0x00,0x00,0xff,0x81,0x81,0x7e,0x00}, 	//d
		{0x00,0x09,0x89,0x89,0xff,0x00,0x00}, 	//e
		{0x00,0x09,0x09,0x09,0xff,0x00,0x00}, 	//f
		{0x00,0xf9,0x89,0x89,0x81,0xff,0x00}, 	//g
		{0x00,0xff,0x08,0x08,0x08,0xff,0x00}, 	//h
		{0x00,0x01,0x81,0xff,0x81,0x01,0x00}, 	//i
		{0x00,0x01,0x7f,0x81,0x81,0x41,0x00}, 	//j
		{0x00,0xc1,0x22,0x14,0x08,0xff,0x00}, 	//k
		{0x00,0x80,0x80,0x80,0x80,0x80,0xff}, 	//l
		{0x7f,0x02,0x04,0x08,0x04,0x02,0x7f}, 	//m
		{0x7f,0x20,0x10,0x08,0x04,0x02,0x7f}, 	//n
		{0x00,0x3e,0x41,0x41,0x41,0x3e,0x00}, 	//o
		{0x00,0x0e,0x11,0x11,0x11,0x7e,0x00}, 	//p
		{0x80,0x3e,0x61,0x41,0x41,0x3e,0x00}, 	//q
		{0x00,0x46,0x29,0x19,0x09,0x7f,0x00}, 	//r
		{0x00,0x39,0x49,0x49,0x49,0x4f,0x00}, 	//s
		{0x01,0x01,0x01,0x3f,0x01,0x01,0x01}, 	//t
		{0x3f,0x40,0x40,0x40,0x40,0x3f,0x00}, 	//u
		{0x0f,0x10,0x20,0x20,0x10,0x0f,0x00}, 	//v
		{0x3f,0x40,0x20,0x20,0x40,0x20,0x1f}, 	//w
		{0x41,0x22,0x14,0x08,0x14,0x22,0x41}, 	//x
		{0x01,0x02,0x04,0xf8,0x04,0x02,0x01}, 	//y
		{0x00,0x43,0x45,0x49,0x51,0x61,0x00}, 	//z
		{0x00,0x00,0x00,0x00,0x00,0x80,0x00} 	//.
};

char arr[91];
short rounds=0,i=0;

void setString(char *);
void reverse_array();

void main(void) {
    WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer
	
    BCSCTL1 = CALBC1_8MHZ;		//changing the DCO's oscillations to 16MHz
    DCOCTL = CALDCO_8MHZ;

    setString("   samarth   "); //13 characters are necessary

    P1DIR = 0xff;
    P1OUT = 0x00;
    P2REN |= BIT0; 			// P2 Enable Pullup/Pulldown
	P2OUT = 0; 			// P2 pullup
	P2IE |= BIT0; 			// P2 interrupt enabled
	P2IES &= ~BIT0; 			// P2 Hi/lo falling edge
	P2IFG &= ~(BIT0); 		// P2IFG cleared just in case

	_EINT();
	_BIS_SR(GIE);					// Enter interrupt

	while(1)
	{
	}
}

void setString(char *str)
{
	int a,b,c=0;         //loop vairables, counter registers
                         //a = scanning the string
                         //b = scanning the character [6 frames]
                         //c = points to the output, i.e. arr[]
                         
	for(a=0;a<13;a++)    //scan the whole string once
	{
		if(str[a]>='a' && str[a]<='z') //if the character is an alphabet
		{
			for(b=6;b>=0;b--)          //then pick 7 frames from the database [data]
			{
				arr[c]=data[str[a]-'a'][b]; //and put into the video ram = arr
				c++;     //increament the output counter                   
			}
		}
		else if(str[a]=='.')          //if the character is a '.'
		{
			for(b=0;b<7;b++)          //pick 7 corresponding frames from the data[]
			{
				arr[c]=data[26][b];   //and place them into the arr[]
				c++;                  //increament the output counter
			}
		}
		else
		{
			for(b=0;b<7;b++)          //for other characters, display a blank
			{
				arr[c]=0x00;
				c++;
			}
		}
	}

	reverse_array();        //reverse the arr[], because the will have to displayed as a mirror
}

void reverse_array()
{
	int a=0,b=90;   //reversing the arr[]
	char temp;
	for(;a<b;a++,b--)
	{
		temp = arr[a];
		arr[a] = arr[b];
		arr[b] = temp;
	}
}

#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
{
	if(rounds==0)
	{
		TA0CCR0 = 0xffff;						// 512 -> 1 sec, 30720 -> 1 min
		TA0CTL = TASSEL_2 + ID_3 + MC_1;			// set the first timer to get the time of revolution, ACLK, /1, upmode
		rounds++;
	}
	else if(rounds==1)
	{
		TA0CTL = TASSEL_2 + ID_3 + MC_0;        //set the first timer
		TA1CCR0 = TA0R/91;						// divide the time by 91
		TA1R=0;                           
		TA1CTL = TASSEL_2 + ID_3 + MC_1;			// set the second timer, ACLK, /1, upmode
		TA1CCTL0 = CCIE;					// CCR0 interrupt enabled
		rounds=0;                           
		i=0;                                //show the data from the first frame
		TA0R=0;
	}
	P2IFG=0;
}


#pragma vector=TIMER1_A0_VECTOR
__interrupt void TIMER1_A0_ISR_HOOK(void)
{
	P1OUT=arr[i];                        //when the timer expires, it displays the value of the next frame
	i++;                                 //stored in the arr

	if(i>=91) i=0;                       //when i = 91, i.e. the last frame, display from the first frame
}