Re: [hatari-devel] DSP and HREQ

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 27/01/2015 23:17, Laurent Sallafranque a écrit :
> Hi,
>
> OK, I need some help now ;)
> Nicolas, I think you've pointed out a bugged part of the DSP emulation ;)
>
> First, I've rewrote the code into hatari dsp emulation like this :
> (The if statement seemed to be wrong to me).
>
>
> static void dsp_core_hostport_update_hreq(void)
> {
>      int hreq;
>
>      hreq = (dsp_core.hostport[CPU_HOST_ICR] &
> dsp_core.hostport[CPU_HOST_ISR]) & 0x3;
>
>      /* Trigger host interrupt? */
>      if ((hreq != 0) && ((dsp_core.hostport[CPU_HOST_ISR] &
> (1<<CPU_HOST_ISR_HREQ)) == 0)) {
>          fprintf(stderr, "Interrupt\n");
>          dsp_host_interrupt();
>      }
>
>      /* Set HREQ bit in hostport */
>      dsp_core.hostport[CPU_HOST_ISR] &= 0x7f;
>      dsp_core.hostport[CPU_HOST_ISR] |= (hreq?1:0) << CPU_HOST_ISR_HREQ;
> }
>
>
>
> Now, I get the fprintf message displayed into the console when I run my
> test code.

Hi
when in doubt, it's always better to add paranthesis :)

> But : it seems I never reach the $3c address (ie in my test program, I
> never break into dsp_inter)
>
> Could it be because of the     move.w    #$2500,sr ?
> Or some bad inner code into hatari ?

I read the default vector number was $f in dsp56001, which would call 
$3c ; but maybe there's another value in the falcon's dsp ? What do you 
read at ffa203.B ?


Nicolas