我已經陷入不知道該怎麼改的地步了，嘗試過把高低中斷互換也沒用><~ 懇請高手幫忙協助，感激萬分。

程式主要的問題在於，當有資料經由RX送進來時，但RX的中斷卻無發生。不要說顯示第2Byte的值，我光連0xAA都顯示不出。(應該是RX中斷都沒發生)

程式構想如下：
程式會判別ADC值，一開始
1.當ADC>0x33，PORTCbits.RC2燈亮、PORTCbits.RC1燈滅(並送出USART:0x31)。
2.當持續5秒後，ADC>0x33。PORTCbits.RC2燈滅、PORTCbits.RC1燈亮(並送出USART:0x32)。
3.當ADC<0x19，PORTCbits.RC2燈亮、PORTCbits.RC1燈亮(並送出USART:0x33)。
4.當持續10秒後，ADC<0x19。PORTCbits.RC2燈滅、PORTCbits.RC1燈滅(並送出USART:0x34)。

但只要接受到RX中斷，PORTB的燈就會按照接收的第二BYTE顯示。
----------------------------------------------

#include <p18f2321.h>
#include <delays.h>
#include <usart.h>
#include <adc.h>
#include <timers.h>


#pragma config OSC=HS, BOR=OFF, BORV=2, PWRT=ON, WDT=OFF, LVP=OFF

#define TMR0_VAL 65536-9840


struct Flag
{
unsigned START:1;
}FLAGbits;

unsigned char rxbuf[1];
unsigned char rxbuf_index;
unsigned char ADC_TEMP;
unsigned int time_cnt;

void Init_TMR0(void);
void timer0_isr (void);
void Rx_isr(void);
void Init_USART(void);
void Init_MCU(void);
void ADC_CKLEVEL(void);
void shutter_dip(void);


#pragma code low_vector=0x18
void low_interrupt(void)
{
_asm GOTO Rx_isr _endasm
}
#pragma code

#pragma interrupt Rx_isr

void Rx_isr (void)
{
unsigned char RX_Temp;
PIR1bits.RCIF = 0;
PORTB=0xAA;
rxbuf[rxbuf_index] = ReadUSART();
rxbuf_index++;

if(!(rxbuf_index<2))
{
PORTB = rxbuf[1];
rxbuf_index=0;
}
}

#pragma code high_vector=0x08
void high_interrupt (void)
{
_asm GOTO timer0_isr _endasm
}
#pragma code

#pragma interrupt timer0_isr

void timer0_isr (void)
{
INTCONbits.TMR0IF=0;
WriteTimer0(TMR0_VAL);

if(time_cnt>0)
time_cnt--;
}


void main (void)
{
Init_MCU();
Init_USART();
Init_TMR0();
TRISC = 0x00;
//PORTC=0xFF;

INTCONbits.TMR0IF=0;
INTCON2bits.TMR0IP=1;

RCONbits.IPEN=1;
INTCONbits.GIEL=1;
INTCONbits.GIEH=1;

WriteUSART(0x00);
while(BusyUSART());

TRISB=0x00;
PORTB=0x00;
rxbuf_index=0;
ADC_TEMP=1;

while (1)
{
switch(ADC_TEMP)
{
case 1:
{
Delay10TCYx(10);
ConvertADC() ;
while(BusyADC());

if(ADRESH>=0x33)
{
time_cnt=500;
ADC_TEMP=2;
PORTCbits.RC2=0;
PORTCbits.RC1=1;
WriteUSART(0x31);
while(BusyUSART());
}
}
break;

case 2:
{


Delay10TCYx(10);
ConvertADC() ;
while(BusyADC());
if(ADRESH>=0x33)
{
if(time_cnt==0)
{
ADC_TEMP=3;
PORTCbits.RC2=1;
PORTCbits.RC1=0;
WriteUSART(0x32);
while(BusyUSART());
}
}
else
ADC_TEMP=1;
}
break;

case 3:
{

Delay10TCYx(10);
ConvertADC() ;
while(BusyADC());

if(ADRESH<=0x19)
{
time_cnt=1000;
ADC_TEMP=4;
PORTCbits.RC2=0;
PORTCbits.RC1=0;
WriteUSART(0x33);
while(BusyUSART());

}
}
break;

case 4:
{
Delay10TCYx(10);
ConvertADC() ;
while(BusyADC());
if(ADRESH<=0x19)
{
if(time_cnt==0)
{
ADC_TEMP=1;
PORTCbits.RC2=1;
PORTCbits.RC1=1;
WriteUSART(0x34);
while(BusyUSART());
}
}
else
ADC_TEMP=3;
}
break;
}//SWITCH ADC
}//while
}

void Init_MCU(void)
{
ADCON0=0x05; //CH1:05 CH0:01
ADCON1=0x0D; //A:AN0、AN1
ADCON2=0x3A;

TRISA=0xFF;
TRISB=0xFF;
TRISC=0XB9;
//TRISCbits.TRISC6=0;
//TRISCbits.TRISC7=1;

PORTA=0xFF;
PORTB=0xFF;
PORTC=0xF9;

FLAGbits.START=0;
}

void Init_USART(void)
{
OpenUSART( USART_TX_INT_OFF &
USART_RX_INT_ON &
USART_ASYNCH_MODE &
USART_EIGHT_BIT &
USART_CONT_RX &
USART_BRGH_HIGH,
12 );
PIR1bits.RCIF=0;
IPR1bits.RCIP=0;
}

void Init_TMR0 (void)
{
OpenTimer0( TIMER_INT_ON &
T0_16BIT &
T0_SOURCE_INT &
T0_EDGE_RISE &
T0_PS_1_1 );

WriteTimer0(TMR0_VAL);
INTCONbits.TMR0IF=0;
INTCON2bits.TMR0IP=0;

INTCONbits.PEIE = 1;
INTCONbits.GIE = 1;
}