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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* Project: HARTIK 3.0 Sound Library */ |
| 2 | /* Description: Hard Real TIme Kernel for 8086 compatible */ |
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| 3 | /* Author: Luca Abeni */ |
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| 4 | /* Date: 5/12/1997 */ |
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| 5 | |||
| 6 | /* File: Blaster.C */ |
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| 7 | /* Revision: 3.0 */ |
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| 8 | |||
| 9 | /* Sound Blaster 16 low-level register access functions */ |
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| 10 | #include <kernel/kern.h> |
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| 11 | #include "sbio.h" |
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| 12 | |||
| 13 | /* Write in a SB16 mixer register */ |
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| 14 | void sbmixer_write(WORD base, BYTE index, BYTE c) |
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| 15 | { |
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| 16 | ll_out(base + MIXERREGISTER, index); |
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| 17 | ll_out(base + MIXERDATA, c); |
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| 18 | } |
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| 19 | |||
| 20 | /* Read a byte from a SB16 mixer register */ |
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| 21 | BYTE sbmixer_read(WORD base, BYTE index) |
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| 22 | { |
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| 23 | ll_out(base + MIXERREGISTER, index); |
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| 24 | return(ll_in(base + MIXERDATA)); |
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| 25 | } |
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| 26 | |||
| 27 | /* Find a SB16 in the system: return the base I/O address or 0 if not found */ |
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| 28 | WORD sb_probe (void) |
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| 29 | { |
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| 30 | WORD base; |
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| 31 | int done = 0; |
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| 32 | |||
| 33 | base = 0x0200; |
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| 34 | while ((!done) && (base < 0x0270)) { |
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| 35 | base += 0x10; |
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| 36 | done = sbdsp_reset(base); |
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| 37 | } |
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| 38 | if (done == 0) { |
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| 39 | base = 0; |
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| 40 | } |
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| 41 | return base; |
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| 42 | } |
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| 43 | |||
| 44 | /* Reset the SB16 DSP: return 1 if OK, 0 if fail */ |
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| 45 | BYTE sbdsp_reset(WORD base) |
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| 46 | { |
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| 47 | int x; |
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| 48 | |||
| 49 | ll_in(base + DATAAVAILABLE); |
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| 50 | ll_out(base + RESET,0x01); |
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| 51 | ll_in(base + RESET); |
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| 52 | ll_in(base + RESET); |
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| 53 | ll_in(base + RESET); |
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| 54 | ll_in(base + RESET); |
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| 55 | ll_out(base + RESET,0x00); |
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| 56 | for(x = 0; x < 100; x++) { |
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| 57 | if(ll_in(base + DATAAVAILABLE)&0x80) { |
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| 58 | if(ll_in(base + READDATA) == 0xAA) break; |
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| 59 | } |
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| 60 | } |
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| 61 | if(x == 100) |
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| 62 | return 0; |
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| 63 | else return 1; |
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| 64 | } |
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| 65 | |||
| 66 | /* Write in SB16 DSP register */ |
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| 67 | void sbdsp_write (WORD base, BYTE c ) |
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| 68 | { |
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| 69 | while(ll_in(base + WRITEBUFFERSTATUS)&0x80); |
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| 70 | ll_out(base + WRITEBUFFERSTATUS,c); |
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| 71 | } |
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| 72 | |||
| 73 | /* Read a byte from SB16 DSP register */ |
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| 74 | BYTE sbdsp_read (WORD base) |
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| 75 | { |
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| 76 | while(!(ll_in(base + DATAAVAILABLE)&0x80)); |
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| 77 | return(ll_in(base + READDATA)); |
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| 78 | } |