Mercurial > sdl-ios-xcode
diff src/audio/mint/SDL_mintaudio_it.S @ 961:185acc07127a
Date: Fri, 29 Oct 2004 11:47:09 +0200
From: Patrice Mandin
Subject: Reworked audio drivers for Atari platform
These are reworked audio drivers for the Atari platform.
Previous drivers were missing some features:
- Test external clock plugged to DSP port on Atari Falcon 030.
- Ability to select internal or external clock.
So now, I generate a list of frequencies available, with the master clock
and predivisor to use. One big caveat to this: I do not have an external
clock, so I hope it works.
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Fri, 29 Oct 2004 09:56:53 +0000 |
| parents | c4803992e09c |
| children | d00b4d8508ab |
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--- a/src/audio/mint/SDL_mintaudio_it.S Sat Oct 09 22:11:45 2004 +0000 +++ b/src/audio/mint/SDL_mintaudio_it.S Fri Oct 29 09:56:53 2004 +0000 @@ -23,7 +23,7 @@ /* Audio interrupts - Patrice Mandin + Patrice Mandin, Didier Méquignon */ .text @@ -33,6 +33,7 @@ .globl _SDL_MintAudio_GsxbInterrupt .globl _SDL_MintAudio_EmptyGsxbInterrupt .globl _SDL_MintAudio_XbiosInterrupt + .globl _SDL_MintAudio_XbiosInterruptMeasureClock .globl _SDL_MintAudio_Dma8Interrupt .globl _SDL_MintAudio_StfaInterrupt @@ -40,6 +41,7 @@ .globl _SDL_MintAudio_audiobuf .globl _SDL_MintAudio_numbuf .globl _SDL_MintAudio_audiosize + .globl _SDL_MintAudio_clocktics .globl _SDL_MintAudio_stfa @@ -94,6 +96,17 @@ _SDL_MintAudio_EmptyGsxbInterrupt: rts +/*--- Xbios interrupt vector to measure Falcon external clock ---*/ + +_SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */ + + btst #0,0xFFFF8901:w /* state DMA sound */ + beqs SDL_MintAudio_EndIntMeasure + addql #1,_SDL_MintAudio_clocktics +SDL_MintAudio_EndIntMeasure: + bclr #5,0xFFFFFA0F:w /* Clear service bit */ + rte + /*--- Xbios interrupt vector ---*/ _SDL_MintAudio_XbiosInterrupt: