Re: [hatari-devel] DSP and HREQ

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

> shouldn't it be %11 to ffe9 (HCR) instead ?

No, HCR is $ffe8 in the motorola doc.




Le 26/01/2015 23:12, Laurent Sallafranque a écrit :
> I check this.
>
> I've found this, it may be of interrest
>
> 10.2.5.2
> HI Interrupts Host Request (HREQ)
> The host processor interrupts are external and use the HREQ pin. HREQ 
> is normally con-
> nected to the host processor maskable interrupt (IPL0 or IPL1 or IPL2 
> in Figure 10-16)
> input. The host processor acknowledges host interrupts by executing an 
> interrupt service
> routine. The most significant bit (HREQ) of the ISR may be tested by 
> the host processor
> to determine if the DSP is the interrupting device and the two least 
> significant bits (RXDF
> and TXDE) may be tested to determine the interrupt source (see Figure 
> 10-17). The host
> processor interrupt service routine must read or write the appropriate 
> HI register to clear
> the interrupt. HREQ is deasserted when1) the enabled request is 
> cleared or masked, 2)
> DMA HACK is asserted, or 3) the DSP is reset.
>
>
>
> Le 26/01/2015 23:12, Nicolas Pomarède a écrit :
> > Le 26/01/2015 23:02, Laurent Sallafranque a écrit :
> > > oops ;)
> > >
> > > For the DSP side, I propose :
> > >
> > > HSR        equ    $ffe9    ;Host Status Register
> > > HTX        equ    $ffeb    ;Host Transmit Register
> > >
> > >
> > >      ; START
> > >      org    p:$0
> > >      jmp     $40
> > >
> > >      org     p:$40
> > >
> > >      ; General code to initialise port B
> > >      movep    #>0,x:<<$fffe
> > >      movep    #$c00,x:<<$ffff
> > >      movep    #>1,x:<<$ffe0
> > >      movep    #>3,x:<<$ffe8        ; enable interrupts
> > >      andi    #$fc,mr
> > >
> > >      jclr    #1,x:<<HSR,*
> > >      move    a,x:HTX
> > >
> > > tst_loop:
> > >      jmp    tst_loop
> > >
> > >
> > >
> > > I think I have to set %11 to $ffe8 to enable interrupts.
> > > I'll test this under hatari first.
> >
> > shouldn't it be %11 to ffe9 (HCR) instead ?