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Rev | Author | Line No. | Line |
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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 | } |