參數(shù)資料
型號： DSPIC30F2010
英文描述： dsPIC?Language Tools Getting Started
中文描述： dsPIC數(shù)字信號？語言工具入門
文件頁數(shù)： 37/56頁
文件大?。?/td> 2612K
代理商： DSPIC30F2010
Tutorial 2 - Real-Time Interrupt
2003 Microchip Technology Inc.
DS70094B-page 33
A main routine and an interrupt service routine may need to be written. The most
complex routine is the interrupt service routine. It is executed when Timer 1 counts
down 0x1388 cycles. It increments a counter
sticks
at each of these 1 ms interrupt
until it exceeds one thousand. Then it increments the
seconds
variable in the
RTclock
structure and resets
sticks
. This routine should count time in seconds. In
the section labelled “
START OF INTERRUPT SERVICE ROUTINES
” where a template
for the _
T1Interrupt()
code is written, replace the comment
“
/* Interrupt Service Routine code goes here */
”
with these lines of code (added code is bold):
EXAMPLE 3-5:
INTERRUPT SERVICE ROUTINE
There are three sample interrupt functions in the template file. Comment out
_INT0Interrupt()
because it uses two of the template file sample variables and, as
a result, will not compile.
_ADCInterrupt()
can be commented out too, since it will
not be used in this tutorial.
By comparison to the Timer 1 interrupt code, the
main()
code is simple. Type this in
for the body, replacing the line “
/* code goes here */
” (added code is bold):
EXAMPLE 3-6:
MAIN CODE
The
main()
code is simply a call to our Timer 1 initialization routine, followed by an
infinite loop, allowing the Timer 1 interrupt to function. Typically, an application that
made use of this timer would be placed in this loop in place of this test variable,
main_counter.
/* Interrupt Service Routine 2 */
/* Fast context save (using push.s and pop.s) */
void __attribute__((__interrupt__, __shadow__)) _T1Interrupt(void)
{
static int sticks=0;
irq_counter++;
if (RTclock.timer > 0)
RTclock.timer -= 1;
/* if timer is active */
/* decrement it */
RTclock.ticks++;
/* increment ticks counter */
if (sticks++ == 1000)
{
sticks = 0;
RTclock.seconds++;
}
/* if time to rollover */
/* clear seconds ticks */
/* and increment seconds */
IFS0bits.T1IF = 0;
/* clear interrupt flag */
}
/* Interrupt Service Routine 3: INT0Interrupt */
/* Save and restore variables var1, var2, etc. */
/************* START OF MAIN FUNCTION ***************/
int main ( void )
{
reset_clock();
for (;;)
main_counter++;
}
/****** START OF INTERRUPT SERVICE ROUTINES *********/
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