C18 Questions

static rom char HW[]="Hello World!";
rom char *P;
char i;

P=HW;           // or P=&HW[0];
while(*P){
    i=*P++;
    putcUSART(i);
}

	//configure timer1
	OpenTimer1(0b10010101);
	
	PIE1bits.TMR1IE = 1; //periferial interupt register, 1 = timer 1 interupt enabled
	PIR1bits.TMR1IF = 0; //clears the timer 1 interupt flag

	//configure CCP1 for capture, rising edge
	CCP1CON = 0b0000101;

	//ccp interrupt
	if(PIR1bits.CCP1IF == 1)
	{	
		if(PWM1Edge == 1)//if detecting rising
		{	
			interrupttest3++;
			
			PWM1RiseTime = CCPR1;//save the low timer value for the rise time
			CCP1CON = 0b0000100;//switch to detect falling edge
			PWM1Edge = 0;//switch to indicate falling edge is next
		}
		else //detecting falling
		{
			interrupttest2++;

			PWM1Width = CCPR1 - PWM1RiseTime;
			CCP1CON = 0b0000101;//switch to detect rising edge
			PWM1Edge = 1;//switch to indicate rising edge is next
		}
		
		interrupttest1++;
		PIR1bits.CCP1IF = 0; //clear the flag
	}
}

 #pragma	config OSC = INTIO2, WDT = OFF, LVP = OFF
 #include <p18f1320.h>


//set up interrupt
void low_ISR(void);//prototype
#pragma code low_vector = 0x18
void low_interrupt (void){
_asm goto low_ISR _endasm
}
#pragma code
#pragma interrupt low_ISR


//setup pins for PWM input
#define ReceiverPin PORTBbits.RB3
#define ReceiverTris TRISBbits.TRISB3


//PWM capture variables
unsigned int PWM1RiseTime = 0;
unsigned int PWM1Width = 0;
char PWM1Edge = 1;

char test1 = 0;

// Interrupts
void low_ISR(void)
{		

	test1 = 1;
	//ccp interrupt
	if(PIR1bits.CCP1IF == 1)
	{	
		PIR1bits.CCP1IF = 0; //clear the flag
		if(PWM1Edge == 1)//if detecting rising
		{	
			
			PWM1RiseTime = CCPR1;//save the low timer value for the rise time
			CCP1CON = 0b0000100;//switch to detect falling edge
			PWM1Edge = 0;//switch to indicate falling edge is next
		}
		else //detecting falling
		{

			PWM1Width = CCPR1 - PWM1RiseTime;
			CCP1CON = 0b0000101;//switch to detect rising edge
			PWM1Edge = 1;//switch to indicate rising edge is next
		}
		
	}
}

void main(void)
{	
	//set clock to 8 Mhz
	OSCCONbits.IRCF0=1;  
	OSCCONbits.IRCF1=1;  
	OSCCONbits.IRCF2=1;  

	//configure timer1
	OpenTimer1(0b10010101);
	PIE1bits.TMR1IE = 1; //periferial interupt register, 1 = timer 1 interupt enabled
	PIR1bits.TMR1IF = 0; //clears the timer 1 interupt flag

	//configure CCP1
	CCP1CON = 0b0000101; //configure CCP1 for capture, rising edge
	ReceiverTris = 1; //set RB3 for input so the capture can work.
	
	//configure ports
	ADCON1 = 0xff; //all digital
	INTCON2bits.RBPU = 0; //port b weak pullups on
	
	while(1)
	{
	}
}

    INTCONbits.PEIE=1;		//enable peripheral ints
    PIE1bits.CCP1IE=1;		//namely the CCP1 int
    INTCONbits.GIE=1;		//finally turn them on

	PIE1bits.TMR1IE = 1; //periferial interupt register, 1 = timer 1 interupt enabled
	PIR1bits.TMR1IF = 0; //clears the timer 1 interupt flag

//Basic configureation of chip periferials
 #pragma config OSC = INTIO2, WDT = OFF, LVP = OFF
 #include <p18f1320.h>

//setup pins for PWM input
#define ReceiverPin PORTBbits.RB3
#define ReceiverTris TRISBbits.TRISB3


//PWM capture variables
unsigned int PWM1RiseTime = 0;
unsigned int PWM1Width = 0;
char PWM1Edge = 1;

//set up interrupt
void low_ISR(void);//prototype
#pragma code low_vector = 0x08
void low_interrupt (void){
_asm goto low_ISR _endasm
}
#pragma code
#pragma interrupt low_ISR

//debug stuff
char test1 = 0;
char test2 = 0;

void main(void)
{	
	OSCCON = 0x72; //8MHz clock
	while(!OSCCONbits.IOFS); //Wait for OSC to become stable 

	//configure timer1
	OpenTimer1(0b10010101);
	PIE1bits.TMR1IE = 1; //periferial interupt register, 1 = timer 1 interupt enabled
	PIR1bits.TMR1IF = 0; //clears the timer 1 interupt flag

	//configure CCP1
	CCP1CON = 0b0000101; //configure CCP1 for capture, rising edge
	INTCONbits.PEIE=1;		//enable peripheral interrupts
    PIE1bits.CCP1IE=1;		//enabled CCP1 interrupt
    INTCONbits.GIE=1;		//enable branching to interrupt
	
	ReceiverTris = 1; //set RB3 for input so the capture can work.
	
	//configure ports
	ADCON1 = 0xff; //all digital
	INTCON2bits.RBPU = 0; //port b weak pullups on
	
	while(1)
	{
	}
}


void low_ISR(void)
{		

	test1 = 1;
	//ccp interrupt
	if(PIR1bits.CCP1IF == 1)
	{	
		PIR1bits.CCP1IF = 0; //clear the flag
		if(PWM1Edge == 1)//if detecting rising
		{	
			
			PWM1RiseTime = CCPR1;//save the low timer value for the rise time
			CCP1CON = 0b0000100;//switch to detect falling edge
			PWM1Edge = 0;//switch to indicate falling edge is next
		}
		else //detecting falling
		{

			PWM1Width = CCPR1 - PWM1RiseTime;
			CCP1CON = 0b0000101;//switch to detect rising edge
			PWM1Edge = 1;//switch to indicate rising edge is next
		}
		
	}
}

#include<p18f4620.h>
void main(void)
{	unsigned int result;
	unsigned int a=0x1018;
	unsigned int b=0x0018;
	unsigned int ceilingrd=0x1018;
	unsigned int ceilingr=0x0018;
	unsigned int diff,perc,castingl,castingh;
	castingl=(ceilingrd);
	castingh=(ceilingrd/256);
	diff=ceilingrd-ceilingr;
	result=b-a;
	perc=(diff/ceilingrd)*100;
	
	while(1);