Rev 1063 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* Project: HARTIK 3.0 Sound Library */ |
| 2 | /* Description: Hard Real TIme Kernel for 8086 compatible */ |
||
| 3 | /* Author: Luca Abeni */ |
||
| 4 | /* Date: 5/12/1997 */ |
||
| 5 | |||
| 6 | /* File: Blaster.C */ |
||
| 7 | /* Revision: 3.0 */ |
||
| 8 | |||
| 1063 | tullio | 9 | /* |
| 10 | * This program is free software; you can redistribute it and/or modify |
||
| 11 | * it under the terms of the GNU General Public License as published by |
||
| 12 | * the Free Software Foundation; either version 2 of the License, or |
||
| 13 | * (at your option) any later version. |
||
| 14 | * |
||
| 15 | * This program is distributed in the hope that it will be useful, |
||
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||
| 18 | * GNU General Public License for more details. |
||
| 19 | * |
||
| 20 | * You should have received a copy of the GNU General Public License |
||
| 21 | * along with this program; if not, write to the Free Software |
||
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
||
| 23 | * |
||
| 24 | */ |
||
| 25 | |||
| 2 | pj | 26 | /* Sound Blaster 16 low-level register access functions */ |
| 27 | #include <kernel/kern.h> |
||
| 28 | #include "sbio.h" |
||
| 29 | |||
| 30 | /* Write in a SB16 mixer register */ |
||
| 31 | void sbmixer_write(WORD base, BYTE index, BYTE c) |
||
| 32 | { |
||
| 33 | ll_out(base + MIXERREGISTER, index); |
||
| 34 | ll_out(base + MIXERDATA, c); |
||
| 35 | } |
||
| 36 | |||
| 37 | /* Read a byte from a SB16 mixer register */ |
||
| 38 | BYTE sbmixer_read(WORD base, BYTE index) |
||
| 39 | { |
||
| 40 | ll_out(base + MIXERREGISTER, index); |
||
| 41 | return(ll_in(base + MIXERDATA)); |
||
| 42 | } |
||
| 43 | |||
| 44 | /* Find a SB16 in the system: return the base I/O address or 0 if not found */ |
||
| 45 | WORD sb_probe (void) |
||
| 46 | { |
||
| 47 | WORD base; |
||
| 48 | int done = 0; |
||
| 49 | |||
| 50 | base = 0x0200; |
||
| 51 | while ((!done) && (base < 0x0270)) { |
||
| 52 | base += 0x10; |
||
| 53 | done = sbdsp_reset(base); |
||
| 54 | } |
||
| 55 | if (done == 0) { |
||
| 56 | base = 0; |
||
| 57 | } |
||
| 58 | return base; |
||
| 59 | } |
||
| 60 | |||
| 61 | /* Reset the SB16 DSP: return 1 if OK, 0 if fail */ |
||
| 62 | BYTE sbdsp_reset(WORD base) |
||
| 63 | { |
||
| 64 | int x; |
||
| 65 | |||
| 66 | ll_in(base + DATAAVAILABLE); |
||
| 67 | ll_out(base + RESET,0x01); |
||
| 68 | ll_in(base + RESET); |
||
| 69 | ll_in(base + RESET); |
||
| 70 | ll_in(base + RESET); |
||
| 71 | ll_in(base + RESET); |
||
| 72 | ll_out(base + RESET,0x00); |
||
| 73 | for(x = 0; x < 100; x++) { |
||
| 74 | if(ll_in(base + DATAAVAILABLE)&0x80) { |
||
| 75 | if(ll_in(base + READDATA) == 0xAA) break; |
||
| 76 | } |
||
| 77 | } |
||
| 78 | if(x == 100) |
||
| 79 | return 0; |
||
| 80 | else return 1; |
||
| 81 | } |
||
| 82 | |||
| 83 | /* Write in SB16 DSP register */ |
||
| 84 | void sbdsp_write (WORD base, BYTE c ) |
||
| 85 | { |
||
| 86 | while(ll_in(base + WRITEBUFFERSTATUS)&0x80); |
||
| 87 | ll_out(base + WRITEBUFFERSTATUS,c); |
||
| 88 | } |
||
| 89 | |||
| 90 | /* Read a byte from SB16 DSP register */ |
||
| 91 | BYTE sbdsp_read (WORD base) |
||
| 92 | { |
||
| 93 | while(!(ll_in(base + DATAAVAILABLE)&0x80)); |
||
| 94 | return(ll_in(base + READDATA)); |
||
| 95 | } |