Page 298 - Programming Microcontrollers in C

Timer Operations 283

while(SCSR.TDRE==OFF);
SCDR=CR;
while(SCSR.TDRE==OFF);
SCDR=LF;
}

/* send a single character to the serial port */

int putchar(char new_character)
{
while(SCSR.TDRE==OFF);
/* wait until transmit buffer empty */
SCDR=new_character;
/* send out byte and reset TDRE */
}

/* convert an integer and send it to the serial
port as a string */

void dprint (unsigned int c)
{
if ( c/10) /* recursively determines if */
dprint(c/10); /* a zero has been reached and then */
putchar(c%10+’0'); /* sends out the characters */
}

/* The asynchronous service portion of the program */

@port void IC1_Isr( void)/*the motor speed
measurement*/
{
static int i;
int j;
time2=TIC1;
TFLG1=IC1F; /* reset IC1 interrupt flag */
mparray[i]=time2-time1;
if (++i==COUNT_8)
{
i=0;