Re: [hatari-devel] Using hatari to generate YM register dump

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 03/11/2023 à 22:49, Georges Kesseler a écrit :
> Some may know me creating videos of chiptune register dumps.

Hi

Yes, I saw these videos, quite nice to see real time dumping of all the 
regs :)

And also your hidden screen in "Oh Crickey" by TLB is still one my all 
time favourite fullscreen/hardscroll combination :)

> I currently use sc68 which has a realtime dump feature of the YM2149 
> registers.
> I process that with a result like this:
> https://www.youtube.com/watch?v=2cLCJ3gRBgw
> (read video description for details of whats shown)
>
> As sc68 does often not play DMA channel, I want to use another engine, 
> i.e. why not hatari.
> My idea is to hook somewhere (that's the question of this email) into 
> hatari to write all YM registes and the system clock every time a 
> register is updated. This is on linux. So write to stdout, then 
> postprocess for "nice" display.
> The dump won't include DMA, too much data. So only YM.
> Before I start digging into the code, maybe there is already something 
> available?
>
> George/Gunstick

you can add some code in sound.c in function Sound_WriteReg() . As you 
can see you get the reg number and its new value.

Then to have some counters, you can use  :
 - nVBLs : number of VBL since hatari started
 - nHBL : HBL number in current VBL (from 0 to 312, depends on video 
freq 50 or 60 Hz)

or for very precise clock measure, use 
Cycles_GetClockCounterOnWriteAccess() which will return uint64_t with 
the total number of cycles since hatari started.


so for example in Sound_WriteReg() you could add :

printf ( "write %x to reg %x VBL=%d HBL=%d clock=%ld\"n , data, reg, 
nVBLS, nHBL , Cycles_GetClockCounterOnWriteAccess() );

Nicolas