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Rev | Author | Line No. | Line |
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2288 | clevermous | 1 | ;-------------------------------- |
2 | ; program dma |
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3 | ;-------------------------------- |
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4 | sb_set_dma: |
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5 | mov ebx, [sound_dma] |
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6 | lea eax, [ebx+4];mask required channel |
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7 | cmp bl, 4 |
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8 | ja .use_second_dma_controller |
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9 | jb @f |
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10 | .dma_setup_error: |
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11 | if DEBUG |
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12 | mov esi, msgErrDMAsetup |
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13 | call SysMsgBoardStr |
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14 | end if |
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15 | mov dword[esp], START.stop |
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16 | ret |
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17 | @@: |
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18 | if use_cli_sti |
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19 | cli ;here to minimize time with disabled ints |
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20 | end if |
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21 | out 0xA, al;mask required channel |
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22 | |||
23 | xor eax, eax |
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24 | out 0xC, al;clear byte pointer flip-flop register |
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25 | |||
26 | lea eax, [ebx+0x58];auto-init mode for channel (ebx) |
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27 | out 0xB, al;DMA channel 0-3 mode register |
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28 | |||
29 | movzx edx, byte[ebx+dma_table];page register |
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30 | mov al, DMAPage |
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31 | out dx, al |
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32 | |||
33 | lea edx, [ebx*2];DMA channel 0-3 base address |
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34 | |||
35 | mov al, 0;LSB is 0 |
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36 | out dx, al |
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37 | |||
38 | ; mov al,0 ;MSB is 0 too |
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39 | out dx, al |
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40 | |||
41 | inc edx ;DMA channel 0-3 byte count |
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42 | |||
43 | mov al, ((sb_buffer_size-1) and 0xff) |
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44 | out dx, al |
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45 | |||
46 | mov al, ((sb_buffer_size-1) shr 8);it is the same |
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47 | out dx, al |
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48 | |||
49 | mov eax, ebx;unmask DMA channel |
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50 | out 0xA, al |
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51 | |||
52 | if use_cli_sti |
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53 | sti |
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54 | end if |
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55 | ret |
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56 | |||
57 | .use_second_dma_controller: |
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58 | cmp bl, 7 |
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59 | ja .dma_setup_error |
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60 | |||
61 | sub bl, 4 |
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62 | sub al, 4 |
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63 | if use_cli_sti |
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64 | cli ;here to minimize time with disabled ints |
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65 | end if |
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66 | out 0xD4, al;mask required channel |
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67 | |||
68 | xor eax, eax |
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69 | out 0xD8, al;clear byte pointer flip-flop register |
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70 | |||
71 | lea eax, [ebx+0x58];auto-init mode for channel (ebx+4) |
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72 | out 0xD6, al;DMA channel 4-7 mode register |
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73 | |||
74 | movzx edx, byte[ebx+dma_table+4];page register |
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75 | mov al, DMAPage |
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76 | out dx, al |
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77 | |||
78 | lea edx, [ebx*4+0xC0];DMA channel 4-7 base address |
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79 | |||
80 | mov al, 0;LSB is 0 ;for 16bit DMA this contains |
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81 | out dx, al;A1-A8 lines of address bus, A0 is zero |
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82 | |||
83 | ; mov al,0 ;MSB is 0 too ;for 16bit DMA this contains |
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84 | out dx, al;A9-A16 lines of address bus |
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85 | |||
86 | inc edx |
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87 | inc edx ;DMA channel 4-7 16bit word count |
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88 | |||
89 | mov al, (((sb_buffer_size/2)-1) and 0xff) |
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90 | out dx, al |
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91 | |||
92 | mov al, (((sb_buffer_size/2)-1) shr 8) |
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93 | out dx, al |
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94 | |||
95 | mov eax, ebx;unmask DMA channel |
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96 | out 0xD4, al |
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97 | |||
98 | if use_cli_sti |
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99 | sti |
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100 | end if |
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101 | ret |
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102 | ;------------------------------------------------------------------------------- |
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103 | ; out byte to SB DSP's write port |
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104 | ;------------------------------------------------------------------------------- |
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105 | macro sb_out data_to_out { |
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106 | @@: |
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107 | in al, dx |
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108 | test al, al;is DSP busy? |
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109 | js @b ;it's busy |
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110 | mov al, data_to_out;it's free |
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111 | out dx, al |
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112 | } |
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113 | ;------------------------------------------------------------------------------- |
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114 | ; stop playing |
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115 | ;------------------------------------------------------------------------------- |
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116 | proc sb_stop |
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117 | mov edx, [sb_base_port] |
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118 | add dl, 0xC |
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119 | sb_out 0xD3 ;turn the speaker off |
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120 | sb_out 0xDA ;exit 8bit DMA |
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121 | sb_out 0xD9 ;exit 16bit DMA |
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122 | ret |
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123 | endp |
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124 | ;------------------------------------------------------------------------------- |
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125 | ; start playing |
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126 | ;------------------------------------------------------------------------------- |
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127 | proc sb_play |
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128 | and [int_flip_flop], 0 |
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129 | mov edx, [sb_base_port] |
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130 | add dl, 0xC |
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131 | sb_out 0xD1 ;turn speaker on |
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132 | ; sb_out 0x48 ;set DSP transfer size ;for older cards, not supported |
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133 | ; ;in this version |
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134 | ; mov ax,32767 ;(64k)/2-1 |
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135 | ;@@: ;out the low byte... |
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136 | ; in al,dx |
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137 | ; test al,al ;is DSP busy? |
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138 | ; js @b ;it's busy |
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139 | ; out dx,al |
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140 | |||
141 | ; mov al,ah ;...then the high byte |
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142 | ;@@: |
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143 | ; in al,dx |
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144 | ; test al,al ;is DSP busy? |
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145 | ; js @b ;it's busy |
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146 | ; out dx,al |
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147 | |||
148 | ; sb_out 0x1C ;auto-init 8bit playback |
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149 | |||
150 | ; 0xBXh - 16 bit DMA mode |
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151 | ; |||| |
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152 | sb_out 10110110b ;bCommand |
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153 | ; |||| |
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154 | ; |||+-reserved |
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155 | ; ||+--turn FIFO on (0 for off) |
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156 | ; |+---auto-init mode on (0 for off) |
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157 | ; +----A/D: 0-output, 1-input |
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158 | ; +------stereo on |
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159 | ; |+-----unsigned (1 for signed) |
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160 | ; || |
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161 | sb_out 00110000b ;bMode |
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162 | ; || |||| |
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163 | ; ---------reserved |
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164 | ;wSize is a number of 16bit samples less 1. For auto-init mode each half |
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165 | ;buffer is (64k)/2 bytes long and, obviously, contains ((64k)/2)/2 samples |
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166 | sb_out (((sb_buffer_size/2/2)-1) and 0xFF) ;wSize.LowByte |
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167 | sb_out (((sb_buffer_size/2/2)-1) shr 8) ;wSize.HighByte |
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168 | ret |
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169 | endp |
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170 | ;------------------------------------------------------------------------------- |
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171 | ; reset DSP |
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172 | ;------------------------------------------------------------------------------- |
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173 | proc sb_reset |
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174 | and [int_flip_flop], 0 |
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175 | mov edx, [sb_base_port] |
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176 | add dl, 6 |
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177 | mov al, 1;start DSP reset |
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178 | |||
179 | if use_cli_sti |
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180 | cli ;here to minimize time with disabled ints |
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181 | end if |
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182 | out dx, al |
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183 | mov ecx, 40;wait at least 3 microsec. |
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184 | @@: |
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185 | in al, dx |
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186 | loop @b |
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187 | |||
188 | xor eax, eax;stop DSP reset |
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189 | if use_cli_sti |
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190 | sti |
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191 | end if |
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192 | out dx, al |
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193 | ret |
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194 | endp |
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195 | |||
196 | ;------------------------------------------------------------------------------- |
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197 | ; set the rate for playing, enable stereo |
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198 | ;------------------------------------------------------------------------------- |
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199 | proc sb_setup |
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200 | mov edx, [sb_base_port] |
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201 | add dl, 0xC |
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202 | sb_out 40h ;set time constant, this is for old cards |
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203 | sb_out sb_tc |
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204 | |||
205 | sb_out 41h ;set sound rate, this can only SB16 |
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206 | sb_out (sb_out_rate shr 8) ;first high byte (MSB) |
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207 | sb_out (sb_out_rate and 0xff) ;then low byte (LSB) |
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208 | |||
209 | ; mov al,0xE ;for older cards, not supported in this version |
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210 | ; sub dl,(0xC-4) ;talk to SB's mixer |
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211 | ; out dx,al ;select this register of the mixer |
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212 | ; mov ecx,6 ;wait for the chip |
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213 | ;@@: |
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214 | ; in al,dx |
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215 | ; loop @b |
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216 | |||
217 | ; inc edx ;now read the data port |
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218 | ; in al,dx |
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219 | ; or al,22h ;turn on stereo |
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220 | ; mov ah,al |
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221 | |||
222 | ; mov al,0xE |
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223 | ; dec edx ;talk to SB's mixer |
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224 | ; out dx,al ;select this register of the mixer |
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225 | |||
226 | ; mov ecx,6 ;wait for the chip |
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227 | ;@@: |
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228 | ; in al,dx |
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229 | ; loop @b |
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230 | |||
231 | ; inc edx ;now send data to the data port |
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232 | ; mov al,ah |
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233 | ; out dx,al |
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234 | |||
235 | ; dec edx |
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236 | ; mov ecx,35 ;wait for the chip |
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237 | ;@@: |
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238 | ; in al,dx |
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239 | ; loop @b |
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240 | ret |
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241 | endp |
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242 | |||
243 | ;------------------------------------------------------------------------------- |
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244 | ; set master volume of SB mixer, note, not only SB16 but SBPro and older |
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245 | ; this is the first step to more full support for hardware |
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246 | ;------------------------------------------------------------------------------- |
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247 | ;in: eax in range [-10000;0] - master volume for _both_ channels |
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248 | ;note that x*3*17/2000 and x*3/2000*17 are not the same numbers, |
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249 | ;because we count in integers |
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250 | proc sb_set_master_vol |
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251 | mov [sb_master_vol], eax |
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252 | add eax, 10000;SB sound level rise from 0 to MAX_LEVEL |
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253 | lea eax, [eax+eax*2];*3 |
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254 | mov ebx, 2000;divisor |
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255 | xor edx, edx |
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256 | cmp byte[sb_DSP_version_int], 4 |
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257 | jae @f ;SBPro's MAX_LEVEL is 15, but we *11 because |
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258 | ;volume byte looks like that: 0xLR, where L - left |
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259 | ;channel volume, R - right, 0<=R,L<=15 |
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260 | div ebx |
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261 | imul eax, 17 |
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262 | mov edx, [sb_base_port] |
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263 | push eax ;here for optimisation |
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264 | add dl, 4 |
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265 | mov al, 0x22;write mixer register 0x22 |
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266 | out dx, al |
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267 | in al, dx;wait for the chip ;6 |
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268 | in al, dx;wait for the chip ;5 |
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269 | in al, dx;wait for the chip ;4 |
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270 | in al, dx;wait for the chip ;3 |
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271 | in al, dx;wait for the chip ;2 |
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272 | in al, dx;wait for the chip ;1 |
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273 | pop eax ;go! |
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274 | inc edx |
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275 | out dx, al |
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276 | ret |
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277 | @@: ;SB16's MAX_LEVEL is 255 |
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278 | imul eax, 17 |
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279 | div ebx |
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280 | mov edx, [sb_base_port] |
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281 | push eax ;here for optimisation |
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282 | add dl, 4 |
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283 | mov al, 0x30;left speaker |
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284 | out dx, al |
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285 | pop eax ;<--+ |
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286 | inc edx ; \/ |
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287 | push eax ;here for optimisation |
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288 | out dx, al;write |
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289 | dec edx |
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290 | mov al, 0x31;right speaker |
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291 | out dx, al |
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292 | pop eax |
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293 | inc edx |
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294 | out dx, al;write |
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295 | ret |
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296 | endp |
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297 | ;---------------------------------------------------------------------------------+ |