diff options
| author | Javier Degirolmo | 2012-08-14 22:49:32 -0300 |
|---|---|---|
| committer | Javier Degirolmo | 2012-08-14 22:49:32 -0300 |
| commit | 6ab75ecb612fbbe2ec939bd758bbbe620e6d5040 (patch) | |
| tree | 8122e6eeeacf4912b439dc77e48ea30181b48c01 /src-68k/sound/echo.68k | |
| parent | 416f24632deee748d4789982262063bda598a1ef (diff) | |
Renamed Echo Tester directory from src-68k to tester
Diffstat (limited to 'src-68k/sound/echo.68k')
| -rw-r--r-- | src-68k/sound/echo.68k | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/src-68k/sound/echo.68k b/src-68k/sound/echo.68k deleted file mode 100644 index 1d02800..0000000 --- a/src-68k/sound/echo.68k +++ /dev/null @@ -1,263 +0,0 @@ -;**************************************************************************** -; 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 |
