ex7-3.c

PIC18實作範例

#include <p18cxxx.h>
#include <usart.h>

#define BaudRate 25  // 38400

void F_Initial(void);
void F_Enable_High_Interrupts ( void );

void High_INT_SER ( void );

#pragma code High_Interrupt_Vector=0x08
void High_INT_VEC (void)
{
	_asm
	goto	High_INT_SER
	_endasm
}
#pragma code

#pragma interrupt High_INT_SER
void High_INT_SER (void)
{
	char C_Temp;
	if ( DataRdyUSART() )
	{
		C_Temp = getcUSART();
		putcUSART(C_Temp);
	}
	PIR1bits.RCIF = 0;
}

void main (void)
{
	F_Initial();
	F_Enable_High_Interrupts();
	while(1);
}

void F_Initial(void)
{
OpenUSART( USART_TX_INT_OFF  &
            USART_RX_INT_ON  &
            USART_ASYNCH_MODE &
            USART_EIGHT_BIT   &
            USART_CONT_RX     &
            USART_BRGH_HIGH,
            BaudRate              );
}

void F_Enable_High_Interrupts (void)
{
	RCONbits.IPEN = 1;
	INTCONbits.GIEH = 1;
}