Subject:
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Can't get input capture to work
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 17 Jan 2000 12:09:27 GMT
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Original-From:
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Rick Violet <radagast@flashANTISPAM.net>
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Viewed:
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774 times
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I'm hoping someone can help me figure out the problem with the following
driver.
Ultimately I want to simulate a sony IR remote control using a 6.270 board.
I acquired the sony-ir.asm and tried it out, but that wasn't working; so I
trimmed it down to the following driver in hopes to get something working.
The driver sets up a falling edge input capture interrupt routine which sets
a flag
to show that the routine was executed.
I hook up a micro-switch to port A pin 0. I press the switch by hand while
my C test program runs.
The test program shows a transition but the interrupt doesn't execute, so
I'm puzzled.
It's bound to be a simple error, but after many hours of trying, I'm
stumped. Anyone have suggestions?
Here's the driver code....
*---------------------------------------------
org MAIN_START
*---------------------------------------------
TCTL2 EQU $1021 ; Timer Control register 2
TMSK1 EQU $1022 ; main Timer interrupt Mask register 1
TIC1INT EQU $EE ; Timer Input Capture 1
*---------------------------------------------
variable_flag FDB 0 ; set by TIC1INT service handler
*---------------------------------------------
subroutine_enable:
LDX #$BF00 ; assume special mode
BSET TMSK1,X $04 ; set IC1I, enable TIC1INT interrupt
BSET TCTL2,X $20 ; capture falling edge
BCLR TCTL2,X $10
RTS
*---------------------------------------------
subroutine_disable:
LDX #$BF00 ; assume special mode
BCLR TMSK1,X $04 ; clear IC1I, diable TIC1INT interrupt
RTS
*---------------------------------------------
subroutine_initialize_module:
LDX #$BF00 ; assume special mode
LDD #ir_routine ; install interrupt vector
STD TIC1INT,X
LDD #0 ; clear flag
STD variable_flag
RTS
*---------------------------------------------
ir_routine:
LDD #1 ; set flag
STD variable_flag
RTI
*---------------------------------------------
*---------------------------------------------
Here's the C test code....
/*---------------------------------------------*/
void main()
{
printf( "RUN\n" );
enable(0);
while( PA0() == 0){}
printf( "PRESSED\n" );
while( PA0() == 1){}
disable(0);
printf( "DONE %d\n", flag );
}
/*---------------------------------------------*/
int PA0()
{
return !( peek(0x1000) & 0x01 );
}
Any suggestions would be greatly appreaciated.
-Rick
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