;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;; ;; Distributed under terms of the GNU General Public License ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;-------------------------------- ; program dma ;-------------------------------- sb_set_dma: mov ebx, [sound_dma] lea eax, [ebx+4];mask required channel cmp bl, 4 ja .use_second_dma_controller jb @f .dma_setup_error: if DEBUG mov esi, msgErrDMAsetup invoke SysMsgBoardStr end if mov dword[esp], START.stop ret @@: if use_cli_sti cli ;here to minimize time with disabled ints end if out 0xA, al;mask required channel xor eax, eax out 0xC, al;clear byte pointer flip-flop register lea eax, [ebx+0x58];auto-init mode for channel (ebx) out 0xB, al;DMA channel 0-3 mode register mov eax, [SB16Buffer] invoke GetPhysAddr mov ecx, eax shr eax, 16 movzx edx, byte[ebx+dma_table];page register out dx, al lea edx, [ebx*2];DMA channel 0-3 base address mov al, cl;LSB out dx, al mov al, ch;MSB out dx, al inc edx ;DMA channel 0-3 byte count mov al, ((sb_buffer_size-1) and 0xff) out dx, al mov al, ((sb_buffer_size-1) shr 8);it is the same out dx, al mov eax, ebx;unmask DMA channel out 0xA, al if use_cli_sti sti end if ret .use_second_dma_controller: cmp bl, 7 ja .dma_setup_error sub bl, 4 sub al, 4 if use_cli_sti cli ;here to minimize time with disabled ints end if out 0xD4, al;mask required channel xor eax, eax out 0xD8, al;clear byte pointer flip-flop register lea eax, [ebx+0x58];auto-init mode for channel (ebx+4) out 0xD6, al;DMA channel 4-7 mode register mov eax, [SB16Buffer] invoke GetPhysAddr mov ecx, eax shr eax, 16 shr ecx, 1 ; 16-bit DMA takes offset in words movzx edx, byte[ebx+dma_table+4];page register out dx, al lea edx, [ebx*4+0xC0];DMA channel 4-7 base address mov al, cl;LSB;for 16bit DMA this contains out dx, al;A1-A8 lines of address bus, A0 is zero mov al, ch;MSB;for 16bit DMA this contains out dx, al;A9-A16 lines of address bus inc edx inc edx ;DMA channel 4-7 16bit word count mov al, (((sb_buffer_size/2)-1) and 0xff) out dx, al mov al, (((sb_buffer_size/2)-1) shr 8) out dx, al mov eax, ebx;unmask DMA channel out 0xD4, al if use_cli_sti sti end if ret ;------------------------------------------------------------------------------- ; out byte to SB DSP's write port ;------------------------------------------------------------------------------- macro sb_out data_to_out { @@: in al, dx test al, al;is DSP busy? js @b ;it's busy mov al, data_to_out;it's free out dx, al } ;------------------------------------------------------------------------------- ; stop playing ;------------------------------------------------------------------------------- proc sb_stop mov edx, [sb_base_port] add dl, 0xC sb_out 0xD3 ;turn the speaker off sb_out 0xDA ;exit 8bit DMA sb_out 0xD9 ;exit 16bit DMA ret endp ;------------------------------------------------------------------------------- ; start playing ;------------------------------------------------------------------------------- proc sb_play and [int_flip_flop], 0 mov edx, [sb_base_port] add dl, 0xC sb_out 0xD1 ;turn speaker on ; sb_out 0x48 ;set DSP transfer size ;for older cards, not supported ; ;in this version ; mov ax,32767 ;(64k)/2-1 ;@@: ;out the low byte... ; in al,dx ; test al,al ;is DSP busy? ; js @b ;it's busy ; out dx,al ; mov al,ah ;...then the high byte ;@@: ; in al,dx ; test al,al ;is DSP busy? ; js @b ;it's busy ; out dx,al ; sb_out 0x1C ;auto-init 8bit playback ; 0xBXh - 16 bit DMA mode ; |||| sb_out 10110110b ;bCommand ; |||| ; |||+-reserved ; ||+--turn FIFO on (0 for off) ; |+---auto-init mode on (0 for off) ; +----A/D: 0-output, 1-input ; +------stereo on ; |+-----unsigned (1 for signed) ; || sb_out 00110000b ;bMode ; || |||| ; ---------reserved ;wSize is a number of 16bit samples less 1. For auto-init mode each half ;buffer is (64k)/2 bytes long and, obviously, contains ((64k)/2)/2 samples sb_out (((sb_buffer_size/2/2)-1) and 0xFF) ;wSize.LowByte sb_out (((sb_buffer_size/2/2)-1) shr 8) ;wSize.HighByte ret endp ;------------------------------------------------------------------------------- ; reset DSP ;------------------------------------------------------------------------------- proc sb_reset and [int_flip_flop], 0 mov edx, [sb_base_port] add dl, 6 mov al, 1;start DSP reset if use_cli_sti cli ;here to minimize time with disabled ints end if out dx, al mov ecx, 40;wait at least 3 microsec. @@: in al, dx loop @b xor eax, eax;stop DSP reset if use_cli_sti sti end if out dx, al ret endp ;------------------------------------------------------------------------------- ; set the rate for playing, enable stereo ;------------------------------------------------------------------------------- proc sb_setup mov edx, [sb_base_port] add dl, 0xC sb_out 40h ;set time constant, this is for old cards sb_out sb_tc sb_out 41h ;set sound rate, this can only SB16 sb_out (sb_out_rate shr 8) ;first high byte (MSB) sb_out (sb_out_rate and 0xff) ;then low byte (LSB) ; mov al,0xE ;for older cards, not supported in this version ; sub dl,(0xC-4) ;talk to SB's mixer ; out dx,al ;select this register of the mixer ; mov ecx,6 ;wait for the chip ;@@: ; in al,dx ; loop @b ; inc edx ;now read the data port ; in al,dx ; or al,22h ;turn on stereo ; mov ah,al ; mov al,0xE ; dec edx ;talk to SB's mixer ; out dx,al ;select this register of the mixer ; mov ecx,6 ;wait for the chip ;@@: ; in al,dx ; loop @b ; inc edx ;now send data to the data port ; mov al,ah ; out dx,al ; dec edx ; mov ecx,35 ;wait for the chip ;@@: ; in al,dx ; loop @b ret endp ;------------------------------------------------------------------------------- ; set master volume of SB mixer, note, not only SB16 but SBPro and older ; this is the first step to more full support for hardware ;------------------------------------------------------------------------------- ;in: eax in range [-10000;0] - master volume for _both_ channels ;note that x*3*17/2000 and x*3/2000*17 are not the same numbers, ;because we count in integers proc sb_set_master_vol mov [sb_master_vol], eax add eax, 10000;SB sound level rise from 0 to MAX_LEVEL lea eax, [eax+eax*2];*3 mov ebx, 2000;divisor xor edx, edx cmp byte[sb_DSP_version_int], 4 jae @f ;SBPro's MAX_LEVEL is 15, but we *11 because ;volume byte looks like that: 0xLR, where L - left ;channel volume, R - right, 0<=R,L<=15 div ebx imul eax, 17 mov edx, [sb_base_port] push eax ;here for optimisation add dl, 4 mov al, 0x22;write mixer register 0x22 out dx, al in al, dx;wait for the chip ;6 in al, dx;wait for the chip ;5 in al, dx;wait for the chip ;4 in al, dx;wait for the chip ;3 in al, dx;wait for the chip ;2 in al, dx;wait for the chip ;1 pop eax ;go! inc edx out dx, al ret @@: ;SB16's MAX_LEVEL is 255 imul eax, 17 div ebx mov edx, [sb_base_port] push eax ;here for optimisation add dl, 4 mov al, 0x30;left speaker out dx, al pop eax ;<--+ inc edx ; \/ push eax ;here for optimisation out dx, al;write dec edx mov al, 0x31;right speaker out dx, al pop eax inc edx out dx, al;write ret endp ;-------------------------------------------------------------------------------