298 lines
7.9 KiB
Plaintext
298 lines
7.9 KiB
Plaintext
;--------------------------------
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; program dma
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;--------------------------------
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sb_set_dma:
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mov ebx,[sound_dma]
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lea eax,[ebx+4] ;mask required channel
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cmp bl,4
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ja .use_second_dma_controller
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jb @f
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.dma_setup_error:
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if DEBUG
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mov esi,msgErrDMAsetup
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call SysMsgBoardStr
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end if
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mov dword[esp],START.stop
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ret
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@@:
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if use_cli_sti
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cli ;here to minimize time with disabled ints
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end if
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out 0xA,al ;mask required channel
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xor eax,eax
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out 0xC,al ;clear byte pointer flip-flop register
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lea eax,[ebx+0x58] ;auto-init mode for channel (ebx)
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out 0xB,al ;DMA channel 0-3 mode register
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movzx edx,byte[ebx+dma_table] ;page register
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mov al,DMAPage
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out dx,al
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lea edx,[ebx*2] ;DMA channel 0-3 base address
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mov al,0 ;LSB is 0
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out dx,al
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; mov al,0 ;MSB is 0 too
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out dx,al
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inc edx ;DMA channel 0-3 byte count
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mov al,((sb_buffer_size-1) and 0xff)
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out dx,al
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mov al,((sb_buffer_size-1) shr 8) ;it is the same
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out dx,al
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mov eax,ebx ;unmask DMA channel
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out 0xA,al
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if use_cli_sti
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sti
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end if
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ret
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.use_second_dma_controller:
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cmp bl,7
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ja .dma_setup_error
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sub bl,4
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sub al,4
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if use_cli_sti
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cli ;here to minimize time with disabled ints
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end if
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out 0xD4,al ;mask required channel
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xor eax,eax
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out 0xD8,al ;clear byte pointer flip-flop register
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lea eax,[ebx+0x58] ;auto-init mode for channel (ebx+4)
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out 0xD6,al ;DMA channel 4-7 mode register
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movzx edx,byte[ebx+dma_table+4] ;page register
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mov al,DMAPage
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out dx,al
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lea edx,[ebx*4+0xC0] ;DMA channel 4-7 base address
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mov al,0 ;LSB is 0 ;for 16bit DMA this contains
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out dx,al ;A1-A8 lines of address bus, A0 is zero
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; mov al,0 ;MSB is 0 too ;for 16bit DMA this contains
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out dx,al ;A9-A16 lines of address bus
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inc edx
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inc edx ;DMA channel 4-7 16bit word count
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mov al,(((sb_buffer_size/2)-1) and 0xff)
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out dx,al
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mov al,(((sb_buffer_size/2)-1) shr 8)
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out dx,al
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mov eax,ebx ;unmask DMA channel
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out 0xD4,al
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if use_cli_sti
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sti
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end if
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ret
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;-------------------------------------------------------------------------------
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; out byte to SB DSP's write port
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;-------------------------------------------------------------------------------
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macro sb_out data_to_out {
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@@:
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in al,dx
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test al,al ;is DSP busy?
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js @b ;it's busy
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mov al,data_to_out ;it's free
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out dx,al
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}
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;-------------------------------------------------------------------------------
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; stop playing
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;-------------------------------------------------------------------------------
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proc sb_stop
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mov edx,[sb_base_port]
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add dl,0xC
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sb_out 0xD3 ;turn the speaker off
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sb_out 0xDA ;exit 8bit DMA
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sb_out 0xD9 ;exit 16bit DMA
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ret
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endp
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;-------------------------------------------------------------------------------
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; start playing
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;-------------------------------------------------------------------------------
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proc sb_play
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and [int_flip_flop],0
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mov edx,[sb_base_port]
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add dl,0xC
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sb_out 0xD1 ;turn speaker on
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; sb_out 0x48 ;set DSP transfer size ;for older cards, not supported
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; ;in this version
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; mov ax,32767 ;(64k)/2-1
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;@@: ;out the low byte...
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; in al,dx
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; test al,al ;is DSP busy?
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; js @b ;it's busy
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; out dx,al
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; mov al,ah ;...then the high byte
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;@@:
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; in al,dx
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; test al,al ;is DSP busy?
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; js @b ;it's busy
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; out dx,al
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; sb_out 0x1C ;auto-init 8bit playback
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; 0xBXh - 16 bit DMA mode
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; ||||
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sb_out 10110110b ;bCommand
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; ||||
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; |||+-reserved
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; ||+--turn FIFO on (0 for off)
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; |+---auto-init mode on (0 for off)
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; +----A/D: 0-output, 1-input
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; +------stereo on
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; |+-----unsigned (1 for signed)
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; ||
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sb_out 00110000b ;bMode
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; || ||||
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; ---------reserved
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;wSize is a number of 16bit samples less 1. For auto-init mode each half
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;buffer is (64k)/2 bytes long and, obviously, contains ((64k)/2)/2 samples
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sb_out (((sb_buffer_size/2/2)-1) and 0xFF) ;wSize.LowByte
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sb_out (((sb_buffer_size/2/2)-1) shr 8) ;wSize.HighByte
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ret
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endp
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;-------------------------------------------------------------------------------
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; reset DSP
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;-------------------------------------------------------------------------------
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proc sb_reset
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and [int_flip_flop],0
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mov edx,[sb_base_port]
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add dl,6
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mov al,1 ;start DSP reset
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if use_cli_sti
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cli ;here to minimize time with disabled ints
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end if
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out dx,al
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mov ecx,40 ;wait at least 3 microsec.
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@@:
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in al,dx
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loop @b
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xor eax,eax ;stop DSP reset
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if use_cli_sti
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sti
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end if
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out dx,al
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ret
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endp
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;-------------------------------------------------------------------------------
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; set the rate for playing, enable stereo
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;-------------------------------------------------------------------------------
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proc sb_setup
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mov edx,[sb_base_port]
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add dl,0xC
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sb_out 40h ;set time constant, this is for old cards
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sb_out sb_tc
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sb_out 41h ;set sound rate, this can only SB16
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sb_out (sb_out_rate shr 8) ;first high byte (MSB)
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sb_out (sb_out_rate and 0xff) ;then low byte (LSB)
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; mov al,0xE ;for older cards, not supported in this version
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; sub dl,(0xC-4) ;talk to SB's mixer
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; out dx,al ;select this register of the mixer
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; mov ecx,6 ;wait for the chip
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;@@:
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; in al,dx
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; loop @b
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; inc edx ;now read the data port
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; in al,dx
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; or al,22h ;turn on stereo
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; mov ah,al
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; mov al,0xE
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; dec edx ;talk to SB's mixer
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; out dx,al ;select this register of the mixer
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; mov ecx,6 ;wait for the chip
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;@@:
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; in al,dx
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; loop @b
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; inc edx ;now send data to the data port
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; mov al,ah
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; out dx,al
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; dec edx
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; mov ecx,35 ;wait for the chip
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;@@:
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; in al,dx
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; loop @b
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ret
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endp
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;-------------------------------------------------------------------------------
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; set master volume of SB mixer, note, not only SB16 but SBPro and older
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; this is the first step to more full support for hardware
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;-------------------------------------------------------------------------------
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;in: eax in range [-10000;0] - master volume for _both_ channels
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;note that x*3*17/2000 and x*3/2000*17 are not the same numbers,
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;because we count in integers
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proc sb_set_master_vol
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mov [sb_master_vol],eax
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add eax,10000 ;SB sound level rise from 0 to MAX_LEVEL
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lea eax,[eax+eax*2] ;*3
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mov ebx,2000 ;divisor
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xor edx,edx
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cmp byte[sb_DSP_version_int],4
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jae @f ;SBPro's MAX_LEVEL is 15, but we *11 because
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;volume byte looks like that: 0xLR, where L - left
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;channel volume, R - right, 0<=R,L<=15
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div ebx
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imul eax,17
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mov edx,[sb_base_port]
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push eax ;here for optimisation
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add dl,4
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mov al,0x22 ;write mixer register 0x22
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out dx,al
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in al,dx ;wait for the chip ;6
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in al,dx ;wait for the chip ;5
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in al,dx ;wait for the chip ;4
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in al,dx ;wait for the chip ;3
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in al,dx ;wait for the chip ;2
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in al,dx ;wait for the chip ;1
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pop eax ;go!
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inc edx
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out dx,al
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ret
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@@: ;SB16's MAX_LEVEL is 255
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imul eax,17
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div ebx
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mov edx,[sb_base_port]
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push eax ;here for optimisation
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add dl,4
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mov al,0x30 ;left speaker
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out dx,al
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pop eax ;<--+
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inc edx ; \/
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push eax ;here for optimisation
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out dx,al ;write
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dec edx
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mov al,0x31 ;right speaker
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out dx,al
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pop eax
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inc edx
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out dx,al ;write
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ret
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endp
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;-------------------------------------------------------------------------------
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