Using C-declared Variables in Assembly Code

Hi,

I'm currently working on a project on the 56F8013 DSP. I have
implemented all my codes in C to make code sharing and maintenance
easier.

However, I would like to use Fast Interrupts and only Assemble codes
are allowed within the ISR.

My problem now is how to access the variables that I have declared in C
within the ISR. I have started to go thru the documentations to see
how this is done. But, any leads will be greatly appreciated!

Regards,
Evan Start a New Thread

You must define the variables are the globe varliables

#define ADC_Addr 0xf080
#define PWM_Addr 0xf040

asm void ISR_ADC_End_of_Scan(void);

int gVar = 100;

void main(void)
{
/* Write your local variable definition here */
int Var =5;
PE_low_level_init();
asm
{
move.w gVar, Y0;
move.w Var, X0;
move.w X0, gVar;
}

/************************************/
/* Initialize fast interrupt reg */
/************************************/

asm (swap SHADOWS);
asm (moveu.w #ADC_Addr,R0); //Initialize ADC address
asm (moveu.w #(PWM_Addr+6),R1); //Initialize PWM
value reg address
asm (moveu.w #0x0,N);
asm (moveu.w #0xffff,M01);
asm (swap SHADOWS);

/* Write your code here */

for(;;) {}

}

//#pragma interrupt alignsp
//#pragma optimization_level 4
asm void ISR_Fast_ADC_End_of_Scan(void)
{

// setRegBits(ADC_ADSTAT,2048); /* Clear EOSI flag */

bfset #0x0800,X:(R0+6) /* Clear EOSI flag */

/*Assembly Example*/
move.w gVar, Y0;
move.w X0, gVar;

frtid //fast interrupt return with Delay
move.w x:(R1)+,y0 //update PWM0 duty cycle
move.w x:(R1)-,y0 //update PWM1 duty cycle

/* Add illegal instruction for debugging trick to
flag improper execution */
illegal
}
--- emespina wrote:

> Hi,
>
> I'm currently working on a project on the 56F8013
> DSP. I have
> implemented all my codes in C to make code sharing
> and maintenance
> easier.
>
> However, I would like to use Fast Interrupts and
> only Assemble codes
> are allowed within the ISR.
>
> My problem now is how to access the variables that I
> have declared in C
> within the ISR. I have started to go thru the
> documentations to see
> how this is done. But, any leads will be greatly
> appreciated!
>
> Regards,
> Evan Start a New Thread