[hatari-devel] Re : DSP host interface interrupted mode : help needed

[LAURENT SALLAFRANQUE]

Hello,

 From what I've understood of the google traduction of the german 
message :), it seems that the DSP sends its interrupt to the COMBEL chip 
and not directly to the MFP chip. The COMBEL gather MFP and DSP 
interrupts at level 6, and interrupts the 68030.

But, as the COMBEL isn't adressable by software (it's a pure hardware 
chip) and as the MFP does already a big part of the COMBEL job, could we 
imagine to just upgrade the actual MFP code to MFP/COMBEL chip 
management. We could add the lightgun interrupt later if needed ;)

Like this, the DSP interrupt could be easily added to the MFP code (at 
interrupt level 6).
I think, the level of interrupt musn't be too high, as the DSP is 
waiting for the host to feed him with datas.
That's not crucial (as a VSYNC is for example).

As I don't know well the MFP part, would you (Thomas), add the interrupt ?

(I can add the "dsp_get_HREQ()" function in dsp.c if you want it to be 
coded this way).

Regards

Laurent


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