#INT Global

[MCW]

Hello,

I´ve got still a problem with the following interrupt service. The program steps into the isr, as planned, but then a reset follows. I´ve looked to the .lst file and found a retlw 00 instruction at the end of my isr.
At the memory address 0x00 is the goto 0x0200 instruction ( my main function is located at this address)

I need some more help in this situation !!!

Best Wishes

#INT_GLOBAL
{
#asm
goto VECTOR_MY_ISR_HIGH
#endasm
}

...
...
...

#org VECTOR_MY_ISR_HIGH, VECTOR_MY_ISR_HIGH + VECTOR_LEN3
void myISR_Vector_High( void )
{
if ( bit_test(INTCON,2) )
{
if (bit_test(INTCON, 5))
{
Var.ISR |= 0x01; }
Bit_Clear(INTCON, 2);
}

if (bit_test(PIR3, 0))
{
if (bit_test(PIE3, 0)) {
Var.ISR |= 0x02; }
BIT_CLEAR(PIR3,0); }

#asm
retfie
#endasm
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 144517124

[R.J.Hamlett]

:=Hello,
:=
:=I´ve got still a problem with the following interrupt service. The program steps into the isr, as planned, but then a reset follows. I´ve looked to the .lst file and found a retlw 00 instruction at the end of my isr.
:=At the memory address 0x00 is the goto 0x0200 instruction ( my main function is located at this address)
:=
:=I need some more help in this situation !!!
:=
:=Best Wishes
You are still not saving the registers...
This has to be done by you (it is not automatic).
Also, since you have not actually defined a 'function' now, the compiler does not treat this as an interrupt handler...
//You will need the addresses of the status register, and BSR defined
//to suit your processor.

#INT_GLOBAL
void isr_handler(void) {
static int save_w;
static int save_status;
static int save_BSR;
#asm
MOVWF save_w
SWAPF status,W
BCF status,5
BCF status,6
MOVWF save_status
//If you want to start jumping around, you will have to
//save PCLATH/L as well
MOVF BSR
MOVWF save_BSR
#endasm
if ( bit_test(INTCON,2) ) {
if (bit_test(INTCON, 5)) {
Var.ISR |= 0x01;
}
Bit_Clear(INTCON, 2);
}

if (bit_test(PIR3, 0)) {
if (bit_test(PIE3, 0)) {
Var.ISR |= 0x02;
}
BIT_CLEAR(PIR3,0);
}
#asm
MOVF save_BSR
MOVWF BSR
SWAPF save_status,W
MOVWF status
SWAPF save_w,F
SWAPF save_w,W
#endasm
}

Best Wishes

:= #INT_GLOBAL
:= {
:= #asm
:= goto VECTOR_MY_ISR_HIGH
:= #endasm
:= }
:=
:= ...
:= ...
:= ...
:=
:= #org VECTOR_MY_ISR_HIGH, VECTOR_MY_ISR_HIGH + VECTOR_LEN3
:= void myISR_Vector_High( void )
:= {
:= if ( bit_test(INTCON,2) )
:= {
:= if (bit_test(INTCON, 5))
:= {
:= Var.ISR |= 0x01; }
:= Bit_Clear(INTCON, 2);
:= }
:=
:= if (bit_test(PIR3, 0))
:= {
:= if (bit_test(PIE3, 0)) {
:= Var.ISR |= 0x02; }
:= BIT_CLEAR(PIR3,0); }
:=
:= #asm
:= retfie
:= #endasm
:= }
___________________________
This message was ported from CCS's old forum
Original Post ID: 144517126