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Diffstat (limited to 'tester/sound/echo.68k')
| -rw-r--r-- | tester/sound/echo.68k | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/tester/sound/echo.68k b/tester/sound/echo.68k new file mode 100644 index 0000000..1d02800 --- /dev/null +++ b/tester/sound/echo.68k @@ -0,0 +1,263 @@ +;**************************************************************************** +; Echo_Z80Request +; Requests the Z80 bus +;**************************************************************************** + +Echo_Z80Request macro + move.w #$100, ($A11100) ; Request Z80 bus +@Echo_WaitZ80\@: + btst.b #0, ($A11100) ; Did we get it yet? + bne.s @Echo_WaitZ80\@ ; Keep waiting + endm ; End of macro + +;**************************************************************************** +; Echo_Z80Release +; Releases the Z80 bus +;**************************************************************************** + +Echo_Z80Release macro + move.w #$000, ($A11100) ; Release Z80 bus + endm ; End of macro + +;**************************************************************************** +; Echo_Z80Reset +; Resets the Z80 and YM2612 +;**************************************************************************** + +Echo_Z80Reset macro + move.w #$000, ($A11200) ; Assert reset line + rept $10 ; Wait until hardware resets + nop ; ... + endr ; ... + move.w #$100, ($A11200) ; Release reset line + endm ; End of macro + +;**************************************************************************** +; Echo_Init +; Initializes Echo +; +; input a0.l ... Address of pointer list +;**************************************************************************** + +Echo_Init: + movem.l d0/a0-a1, -(sp) ; Save registers + + Echo_Z80Reset ; May not work without this... + Echo_Z80Request ; We need the Z80 bus + + move.b #$01, ($A01FFF) ; Command: load pointer list + + move.l a0, d0 ; Easier to manipulate here + move.b d0, ($A01FFD) ; Store low address byte + lsr.l #7, d0 ; Get high address byte + lsr.b #1, d0 ; We skip one bit + bset.l #7, d0 ; Point into bank window + move.b d0, ($A01FFE) ; Store high address byte + lsr.w #8, d0 ; Get bank byte + move.w d0, d1 ; Parse 32X bit separately + lsr.w #1, d1 ; Put 32X bit in place + and.b #$7F, d0 ; Filter out unused bit from addresses + and.b #$80, d1 ; Filter out all but 32X bit + or.b d1, d0 ; Put everything together + move.b d0, ($A01FFC) ; Store bank byte + + lea @Z80Program(pc), a0 ; Where Z80 program starts + lea ($A00000), a1 ; Where Z80 RAM starts + move.w #@Z80ProgSize-1, d0 ; Size of Z80 program (DBF adjusted) +@LoadLoop: ; Go through all the program + move.b (a0)+, (a1)+ ; Copy byte into Z80 RAM + dbf d0, @LoadLoop ; Go for next byte + + Echo_Z80Reset ; Now reset for real + Echo_Z80Release ; Let the Z80 go! + + movem.l (sp)+, d0/a0-a1 ; Restore registers + rts ; End of subroutine + +;**************************************************************************** +; Echo Z80 program +; It should be located wherever Echo_ProgFile was defined +;**************************************************************************** + +@Z80Program: incbin "\Echo_ProgFile" +@Z80ProgSize equ *-@Z80Program + even + +;**************************************************************************** +; Echo_SendCommand +; Sends an Echo command (no address parameter) +; +; input d0.b ... Echo command +;**************************************************************************** + +Echo_SendCommand: + move.w d1, -(sp) ; Save register + + Echo_Z80Request ; We need the Z80 bus + +@Try: + tst.b ($A01FFF) ; Check if Echo is ready + beq.s @Ready ; Too busy? + Echo_Z80Release ; Let Echo continue + move.w #$FF, d1 ; Give it some time + dbf d1, * ; ... + Echo_Z80Request ; Get Z80 bus back + bra.s @Try ; Try again + +@Ready: + move.b d0, ($A01FFF) ; Write command ID + Echo_Z80Release ; We're done with the Z80 bus + + move.w (sp)+, d1 ; Restore register + rts ; End of subroutine + +;**************************************************************************** +; Echo_SendCommandEx +; Sends an Echo command (with address parameter) +; +; input d0.b ... Echo command +; input a0.l ... Address parameter +;**************************************************************************** + +Echo_SendCommandEx: + movem.l d0-d1, -(sp) ; Save register + + Echo_Z80Request ; We need the Z80 bus + +@Try: + tst.b ($A01FFF) ; Check if Echo is ready + beq.s @Ready ; Too busy? + Echo_Z80Release ; Let Echo continue + move.w #$FF, d1 ; Give it some time + dbf d1, * ; ... + Echo_Z80Request ; Get Z80 bus back + bra.s @Try ; Try again + +@Ready: + move.b d0, ($A01FFF) ; Write command ID + + move.l a0, d0 ; Easier to manipulate here + move.b d0, ($A01FFD) ; Store low address byte + lsr.l #7, d0 ; Get high address byte + lsr.b #1, d0 ; We skip one bit + bset.l #7, d0 ; Point into bank window + move.b d0, ($A01FFE) ; Store high address byte + + lsr.w #8, d0 ; Get bank byte + move.w d0, d1 ; Parse 32X bit separately + lsr.w #1, d1 ; Put 32X bit in place + and.b #$7F, d0 ; Filter out unused bit from addresses + and.b #$80, d1 ; Filter out all but 32X bit + or.b d1, d0 ; Put everything together + move.b d0, ($A01FFC) ; Store bank byte + + Echo_Z80Release ; We're done with the Z80 bus + + movem.l (sp)+, d0-d1 ; Restore register + rts ; End of subroutine + +;**************************************************************************** +; Echo_PlaySFX +; Plays a SFX +; +; input a0.l ... Pointer to SFX data +;**************************************************************************** + +Echo_PlaySFX: + move.w d0, -(sp) ; Save register + move.b #$02, d0 ; Command $02 = play SFX + bsr Echo_SendCommandEx ; Send command to Echo + move.w (sp)+, d0 ; Restore register + rts ; End of subroutine + +;**************************************************************************** +; Echo_StopSFX +; Stops SFX playback +;**************************************************************************** + +Echo_StopSFX: + move.w d0, -(sp) ; Save register + move.b #$03, d0 ; Command $03 = stop SFX + bsr Echo_SendCommand ; Send command to Echo + move.w (sp)+, d0 ; Restore register + rts ; End of subroutine + +;**************************************************************************** +; Echo_PlayBGM +; Plays a BGM +; +; input a0.l ... Pointer to BGM data +;**************************************************************************** + +Echo_PlayBGM: + move.w d0, -(sp) ; Save register + move.b #$04, d0 ; Command $04 = play BGM + bsr Echo_SendCommandEx ; Send command to Echo + move.w (sp)+, d0 ; Restore register + rts ; End of subroutine + +;**************************************************************************** +; Echo_StopBGM +; Stops BGM playback +;**************************************************************************** + +Echo_StopBGM: + move.w d0, -(sp) ; Save register + move.b #$05, d0 ; Command $05 = stop BGM + bsr Echo_SendCommand ; Send command to Echo + move.w (sp)+, d0 ; Restore register + rts ; End of subroutine + +;**************************************************************************** +; Echo_ResumeBGM +; Resumes BGM playback +;**************************************************************************** + +Echo_ResumeBGM: + move.w d0, -(sp) ; Save register + move.b #$06, d0 ; Command $06 = resume BGM + bsr Echo_SendCommand ; Send command to Echo + move.w (sp)+, d0 ; Restore register + rts ; End of subroutine + +;**************************************************************************** +; Echo_GetStatus +; Gets the current status of Echo +; +; output d0.w ... Echo status +; Bit #0: SFX is playing +; Bit #1: BGM is playing +; Bit #15: command still not parsed +;**************************************************************************** + +Echo_GetStatus: + moveq #0, d0 + Echo_Z80Request ; We need the Z80 bus + move.b ($A01FF0), d0 ; Get the status flags + tst.b ($A01FFF) ; Check if command still has to be parsed + beq.s @NotBusy ; Any commands left to be parsed? + bset.l #15, d0 ; If so, set the relevant flag +@NotBusy: + Echo_Z80Release ; Let the Z80 go! + rts ; End of subroutine + +;**************************************************************************** +; Echo_ListEntry +; Defines an entry in a pointer list +;**************************************************************************** + +Echo_ListEntry macro addr + dc.b $80|((addr)>>8&$7F) ; High byte of address + dc.b (addr)&$FF ; Low byte of address + dc.b ((addr)>>15&$7F)|((addr)>>16&$80) ; Bank number + endm + +;**************************************************************************** +; Echo_ListEnd +; Ends a pointer list +;**************************************************************************** + +Echo_ListEnd macro + dc.b $00 ; End of list mark + even ; Just in case... + endm |