Re: [hatari-devel] DSP for Previous

[David Savinkoff <dsavnkff@xxxxxxxxx>]

Hi,

I'm a curious onlooker and noticed that nobody responded to this patch:
dsp_patch3.diff
What is the status?

----- Andreas Grabher wrote:
> Luckily it turned out that the mode bits in the system control register are inverted. So mode 2 is mode 1 and that is the one that is implemented.
> 
> With some additions to the code (some bits in ICR seemed to be ignored) now at least it does something.
> Maybe some of these changes are useful for Hatari too (see appended file). I'd be glad if someone could check them for correctness.
> 
> btw. It seems to me that Hatari is releasing the HREQ interrupt in a wrong way. DSP should release it, not CPU.
> 
> 
> 
> Am 03.06.2015 um 19:10 schrieb Douglas Little:
> 
> > Hi,
> > 
> > I added the DSP code from Hatari v1.8.0. It was easy to make it compile. But then i ran into an early problem:
> > The 56001 has 4 operating modes:
> > 
> > Has anyone some insight in how the other modes could be implemented? At first look the differences between the modes seem to be mostly related to DSP reset.
> > 
> > 
> > IIRC the modes affect two things - the reset 'delay' (16 cycles vs 'lots') and the address of external memory to bootstrap from. However, I haven't used any of that so there may be further complications :)
> > 
> > D
> > 
>