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Forum Index : Microcontroller and PC projects : Porting from Original Maximite Color to CMM2

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Vampire05
Regular Member

Joined: 06/12/2020
Location: Germany
Posts: 88
Posted: 02:28pm 10 Dec 2020
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Hi guys, I'm currently trying to port Donut Dilemma (by Nick Marantes) to the CMM2. I have some questions about MOD files:

Old interface:
PLAYMOD file [, dur]

New interface:
PLAY MODFILE file$ [,samplerate]

1st problem: How can I implement the duration parameter on the CMM2?

2nd problem: Playing sound effects from SD card is too slow. Is it possible to put the MOD sample into RAM or Flash and play it from there?
 
yock1960
Senior Member

Joined: 18/08/2020
Location: United States
Posts: 167
Posted: 04:53pm 10 Dec 2020
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If you only want to play the modfile for a limited time, regardless of the files actual playtime, you can use settick [interrupt period, target subroutine, interrupt # (1-4)]. The interrupt sub can stop or change the modfile...whatever you want. I'm not sure what you mean by too slow. How big are your modfiles? I added support for modfiles to the Mandelbrot16 program, files up to 500k load plenty fast. I have noticed, when playing around with Mauro Xavier's vgmfile stuff, that there can be issues with loading files, depending on the basic progam's size...apparently...I haven't quite figured it out. Perhaps it's an issue with your SD card timings....this is a known issue, that I haven't personally experienced AFAIK.

Steve
 
Vampire05
Regular Member

Joined: 06/12/2020
Location: Germany
Posts: 88
Posted: 06:33pm 10 Dec 2020
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Thank you yock1960. You are right, "play modfile" from sd card is fast enough. It was my mistake with the "play modfile" command  

My next question is the BLIT command. On the original Maximite, blit moves an area of the video screen. On the CMM2, blit copies an area of the video screen.

Is there an alternative to the old blit command?
 
yock1960
Senior Member

Joined: 18/08/2020
Location: United States
Posts: 167
Posted: 10:41pm 10 Dec 2020
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  Vampire05 said  Thank you yock1960. You are right, "play modfile" from sd card is fast enough. It was my mistake with the "play modfile" command  

My next question is the BLIT command. On the original Maximite, blit moves an area of the video screen. On the CMM2, blit copies an area of the video screen.

Is there an alternative to the old blit command?


Blit can still do that, though the syntax may be different. What it won't do, is copy black pixels and I guess that is on account of the 12 bit modes and black being seen as transparent there.

Steve
 
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