各位高手....
我寫了一個簡單的抓pwm程式，可是想請問是否可以讓我的程式執行下來更有效率，以方便我抓到更小的pwm波寬值，麻煩高手指教，謝謝。
我的程式如下：
#include <p18f452.h>
#include <usart.h>
#include <delays.h>
#include <timers.h>
#include <stdlib.h>
#include <portb.h>

#define UART_40Mhz_19200 129


void external_int(void);

unsigned char a[7];
unsigned char PWM_out[8];


union
{
unsigned char One_Byte[2];
unsigned int Two_Byte[1];
}Buff;


#pragma code high_vector=0x0008 // high priotity interrupt isr
void high_interrupt (void)
{_asm goto external_int _endasm}
#pragma code

//********* Port B chagne detect *********
#pragma interrupt external_int

void external_int()
{
//** INT0 **********************************************
if(INTCONbits.INT0IF){
WriteTimer1(0);
TMR1H=0;
TMR1L=0;
INTCONbits.INT0IF=0; // clear INT0IF

}

//**** INT 1 **********************************************
if(INTCON3bits.INT1IF){
//x=ReadTimer1();
Buff.One_Byte[0]=TMR1L;
Buff.One_Byte[1]=TMR1H;
INTCON3bits.INT1IF=0;
}
}
#pragma

//**********************************************//
void main(){
// Setup UART for 9600bps with 20MHZ for high speed
OpenUSART(USART_TX_INT_OFF&
USART_RX_INT_OFF&
USART_ASYNCH_MODE&
USART_EIGHT_BIT&
USART_CONT_RX&
USART_BRGH_HIGH,UART_40Mhz_19200);
//Setup Timer1
OpenTimer1(TIMER_INT_OFF&
T1_16BIT_RW&
T1_SOURCE_INT&
T1_PS_1_1);

//Initialize Ports
TRISB=0b00000011;// set RB5-RB4 for input on change
TRISCbits.TRISC2=1;// CCP1
TRISCbits.TRISC6=0;
TRISCbits.TRISC7=1;

TRISD=0; // PORTD all output
PORTB=0;
PORTD=0;

// Set up interrupt control bit
PIR1bits.TMR1IF=0; // clear timer1 IF

// setup INT0
INTCONbits.INT0IE=1;
INTCONbits.INT0IF=0;
INTCON2bits.INTEDG0=1;// set INT0 for Rising Edge

// setup INT1
INTCON3bits.INT1IE=1;
INTCON3bits.INT1IF=0;
INTCON2bits.INTEDG1=0;// set INT1 for Falling Edge
INTCON3bits.INT1IP=1;// set for Low Priority

RCONbits.IPEN=1; // enable priority interrupt
INTCONbits.PEIE=1;// enable peripheral interrupt
INTCONbits.GIE=1;// enable global interrupt

putrsUSART("\r AS5040 PWM Measurement \n\r");

while(1)
{
//ltoa(x,a);
ltoa(Buff.Two_Byte[0],PWM_out);
putrsUSART("\rPWM ");
Delay10KTCYx(1);
//putsUSART(a);

putsUSART(PWM_out);
putrsUSART("\n");
}

}