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comparison src/audio/mint/SDL_mintaudio_it.S @ 961:185acc07127a

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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
comparison
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960:eec28a5278be 961:185acc07127a
21 */ 21 */
22 22
23 /* 23 /*
24 Audio interrupts 24 Audio interrupts
25 25
26 Patrice Mandin 26 Patrice Mandin, Didier Méquignon
27 */ 27 */
28 28
29 .text 29 .text
30 30
31 .globl _SDL_MintAudio_Callback 31 .globl _SDL_MintAudio_Callback
32 32
33 .globl _SDL_MintAudio_GsxbInterrupt 33 .globl _SDL_MintAudio_GsxbInterrupt
34 .globl _SDL_MintAudio_EmptyGsxbInterrupt 34 .globl _SDL_MintAudio_EmptyGsxbInterrupt
35 .globl _SDL_MintAudio_XbiosInterrupt 35 .globl _SDL_MintAudio_XbiosInterrupt
36 .globl _SDL_MintAudio_XbiosInterruptMeasureClock
36 .globl _SDL_MintAudio_Dma8Interrupt 37 .globl _SDL_MintAudio_Dma8Interrupt
37 .globl _SDL_MintAudio_StfaInterrupt 38 .globl _SDL_MintAudio_StfaInterrupt
38 39
39 .globl _SDL_MintAudio_mutex 40 .globl _SDL_MintAudio_mutex
40 .globl _SDL_MintAudio_audiobuf 41 .globl _SDL_MintAudio_audiobuf
41 .globl _SDL_MintAudio_numbuf 42 .globl _SDL_MintAudio_numbuf
42 .globl _SDL_MintAudio_audiosize 43 .globl _SDL_MintAudio_audiosize
44 .globl _SDL_MintAudio_clocktics
43 45
44 .globl _SDL_MintAudio_stfa 46 .globl _SDL_MintAudio_stfa
45 47
46 /* 48 /*
47 How it works: 49 How it works:
92 94
93 clrw _SDL_MintAudio_mutex 95 clrw _SDL_MintAudio_mutex
94 _SDL_MintAudio_EmptyGsxbInterrupt: 96 _SDL_MintAudio_EmptyGsxbInterrupt:
95 rts 97 rts
96 98
99 /*--- Xbios interrupt vector to measure Falcon external clock ---*/
100
101 _SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */
102
103 btst #0,0xFFFF8901:w /* state DMA sound */
104 beqs SDL_MintAudio_EndIntMeasure
105 addql #1,_SDL_MintAudio_clocktics
106 SDL_MintAudio_EndIntMeasure:
107 bclr #5,0xFFFFFA0F:w /* Clear service bit */
108 rte
109
97 /*--- Xbios interrupt vector ---*/ 110 /*--- Xbios interrupt vector ---*/
98 111
99 _SDL_MintAudio_XbiosInterrupt: 112 _SDL_MintAudio_XbiosInterrupt:
100 113
101 /* Reenable interrupts, so other interrupts can work */ 114 /* Reenable interrupts, so other interrupts can work */