plz help using interrupt

pallav — Mon, 26 Jun 2006 14:23:36 GMT

hi,

i want to use interrupt on Serial recieive(ESCI) i am using QB8 4.9152Mhz crystal

plz guide where and how to write the interrupt routine and what r thr various setting or any line i have to write to enable and use interrupt

in interupt(RX of ESCI) i want to say tx some byte.

#include <hidef.h> /* for EnableInterrupts macro */
#include <MC68HC908QB4.h> /* include peripheral declarations */

//macro defination for PORTB out
#define setbit(A,B) A|=(1<<B)
#define clrbit(A,B) A&=~(1<<B)

void uart_init(void)
{

setbit(DDRB,5); //TX as output
clrbit(DDRB,4); //RX as input

SCC1=0x40;
SCC2=0x0c;
SCC3=0x00;
SCBR=0x00;
SCPSC=0xE0;
}

void uart_sendbyte(unsigned char byte)
{
while(!SCS1_SCTE);
while(!SCS1_TC);
SCDR=byte;
while(!SCS1_TC);
}

unsigned char uart_rxbyte(void)
{
unsigned char byte;
while(!SCS1_SCRF);
byte=SCDR;
return byte;
}

void delay(unsigned int cycles)
{
while(cycles) cycles--;
}

void adc_init()
{
ADCLK = 0x24;
ADSCR = 0x1F;
}

unsigned int adc(unsigned char channel)
{
   unsigned int adc_value;
   ADSCR |= channel;
   delay(100);
   while(!ADSCR_COCO);
   adc_value=(ADRH<<8);
   adc_value=adc_value+ADRL;
   return adc_value;
}

void main(void)
{

CONFIG1=0x01;//disable COP
delay(1000);
OSCSC=0xC4;
delay(100);
OSCSC |=0x02;

//PTB0=analog input
//PTB1=Fault digittal input
//PTB4=RX RS232 INPUT
//PTB5=TX RS232 OUTPUT

DDRB = 0x00;//All INPUT INITIALLY
uart_init();
adc_init();

while(1)
    {
    uart_sendbyte(0xAA);
    delay(500);
    }

}

please guide me with some example code

thanks and regards

Pallav Aggarwal

Re: plz help using interrupt

BlackNight — Tue, 27 Jun 2006 16:58:25 GMT

Hello,
Just giving some documentation hints:
I suggest that you first have a look into the compiler manual (in the Help\pdf subfolder). There is information about how to tell the compiler to generate code for interrupt service routines. You can search for #pragma TRAP_PROC or how to use the 'interrupt' keyword.

If you are using the TRAP_PROC way or interrupt without a vector number, you need to tell the linker where to allocate the vectors. See the linker manual and and see the things about 'VECTOR'.

Erich

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plz help using interrupt

Re: plz help using interrupt