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vgmplay: added new timing type - measured fdelay based on hbios timer

pull/655/head
Dean Netherton 5 days ago
parent
10dc0fc005
commit
ba40c83dc4
1 changed files with 174 additions and 21 deletions
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  1. 195
      Source/Apps/VGM/vgmplay.asm

195
Source/Apps/VGM/vgmplay.asm
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@ -41,6 +41,28 @@ plt_type .equ sbcecb ; Select build configuration
debug .equ 0 ; Display port, register, config info
;
;------------------------------------------------------------------------------
; Configure timing loop
;------------------------------------------------------------------------------
;
cpu_loop: .equ 0
ctc_poll: .equ 1
ctc_int: .equ 2 ; not implemented
hbios_tmr: .equ 3 ; use hbios 50hz or 60hz timer to calculate a fdelay value (plt_romwbw must be set)
;
delay_type: .equ hbios_tmr ; cpu timed loop or utilize ctc
delay_wait .equ 0 ; funny wait mode for ctc
;
D60 .equ 735 ; 735x60=44100 Frame delay values for ntsc
D50 .equ 882 ; 882x50=44100 Frame delay values for pal
#IF (delay_type==hbios_tmr)
#IF (plt_romwbw!=1)
## Assembly configuration Error
## Must have plt_romwbw set, for delay_type==hbios_tmr
#ENDIF
#ENDIF
;
;------------------------------------------------------------------------------
; Platform specific definitions. If building for ROMWBW, these may be overridden
;------------------------------------------------------------------------------
;
@ -183,20 +205,6 @@ YMSEL .equ VGMBASE+00H ; Primary YM2162 11000000 a1=0 a0=0
#ENDIF
;
;------------------------------------------------------------------------------
; Configure timing loop
;------------------------------------------------------------------------------
;
cpu_loop: .equ 0
ctc_poll: .equ 1
ctc_int: .equ 2 ; not implemented
;
delay_type: .equ cpu_loop ; cpu timed loop or utilize ctc
delay_wait .equ 0 ; funny wait mode for ctc
;
D60 .equ 735 ; 735x60=44100 Frame delay values for ntsc
D50 .equ 882 ; 882x50=44100 Frame delay values for pal
;
;------------------------------------------------------------------------------
; CTC Defaults
;------------------------------------------------------------------------------
;
@ -308,7 +316,11 @@ LF .equ 0AH ; line feed
;
CALL vgmsetup ; Device setup
call welcome ; Welcome message and build debug info
#IF (delay_type==hbios_tmr)
call bcpu
#ENDIF
call vgmreadr ; read in the vgm file
;
;------------------------------------------------------------------------------
; Play loop
@ -326,7 +338,7 @@ MAINLOOP CALL PLAY ; Play one frame
OR A
JR NZ,EXIT
NO_CHK:
#IF (delay_type==cpu_loop)
#IF ((delay_type==cpu_loop) | (delay_type==hbios_tmr))
vdelay: .equ $+1
ld hl,vdelay
fdelay: .equ $+1
@ -361,7 +373,7 @@ lp3: in a,(ctcch3) ; wait for counter to reach zero
;
#IF (delay_type==ctc_int)
#ENDIF
;
JP MAINLOOP
;
;------------------------------------------------------------------------------
@ -431,7 +443,7 @@ HASEXT: LD C,OPENF ; Open File
LD (FCBCR), A
LD DE, VGMDATA
LD (VGMPOS), DE
RLOOP
RLOOP
; LD A,(TOPM) ; CBIOS start
; SUB 10h ; Less BDOS = Top Memory Page
LD A,$D6 ; Hardcoded top of memory
@ -1285,6 +1297,7 @@ MSG_TRACK .DB "Playing: ",0
MSG_CPU .DB "[cpu]",0
MSG_CTCPOLL .DB "[ctc polled]",0
MSG_CTCINT .DB "[ctc interrupts]",0
MSG_HBIOSTMR .DB "[hbios timer]",0
MSG_ROMWBW .DB " [romwbw] ",0
@ -1312,7 +1325,7 @@ VGM_DEV .DB %00000000 ; IX+0 Flags for devices
.DB %00000000 ; IX+1 Unimplemented device flags & future devices
;
OLDSTACK .DW 0 ; original stack pointer
.FILL 40H ; space for stack
.FILL 80H ; space for stack
STACK .DW 0 ; top of stack
;------------------------------------------------------------------------------
@ -1364,7 +1377,7 @@ welcome: LD DE,MSG_WELC ; Welcome Message
CALL PRTSTR
#ENDIF
;
LD A,delay_type ; display build type
LD A,delay_type ; display delay type
LD DE,MSG_CPU
CALL PRTIDXDEA
;
@ -1374,7 +1387,7 @@ welcome: LD DE,MSG_WELC ; Welcome Message
call CRLF
;
#IF (debug)
#IF (delay_type==cpu_loop)
#IF ((delay_type==cpu_loop) | (delay_type==hbios_tmr))
ld a,'f' ; Display frame rate delay
call PRTCHR
call PRTDOT
@ -1407,6 +1420,146 @@ welcome: LD DE,MSG_WELC ; Welcome Message
#ENDIF
CALL CRLF
ret
#IF (delay_type==hbios_tmr)
bcpu:
CALL hbios_tmr_enabled
JP z, setfdelay
LD DE, MSG_BENCHMARK
CALL PRTSTR
; get current timer tick value
LD BC, $F8D0 ; GET TIMER TICKS
RST 08 ; FROM HBIOS
; hl is current timer tick value
; c is freq
LD A, L
PUSH AF
; sync to next timer tick
; or timeout if there is no timer
bc1:
LD BC, $F8D0 ; GET TIMER TICKS
RST 08 ; FROM HBIOS
POP AF
PUSH AF
CP L
JR Z, bc1
POP AF
LD H, L
PUSH HL ; save current tick value
LD B, 0
LD HL, 2000
bc2:
DJNZ $
DEC HL
LD A, H
OR L
JR NZ, bc2
LD BC, $F8D0 ; GET TIMER TICKS
RST 08 ; FROM HBIOS
LD A, L
POP HL
; h is starting timer tick
; a is current timer tick
; calculate a-l
SUB L
#IF (debug)
CALL CRLF
CALL PRTDOT
CALL PRTDECB
CALL PRTDOT
#ENDIF
; c is TICKFREQ
; conversion rates are 50Hz -> 580, 60Hz -> 697
LD HL, 580
PUSH AF
LD A, C
CP 50
JR Z, bc3
LD HL, 697
bc3:
POP AF
LD C, A
CALL divide_16_by_8
LD A, L
#IF (debug)
CALL PRTDECB
#ENDIF
CALL CRLF
LD (fdelay), A
RET
; determine if hbios's timer is installed
; returns:
; A == 0 & Z if no timer
; A != 0 & NZ if timer
hbios_tmr_enabled:
LD BC, $F8D0 ; GET TIMER TICKS
RST 08 ; FROM HBIOS
PUSH HL ; save current ticks
; loop for a bit
LD B, 0
LD HL, 500
tme1:
DJNZ $
DEC HL
LD A, H
OR L
JR NZ, tme1
LD BC, $F8D0 ; GET TIMER TICKS
RST 08 ; FROM HBIOS
LD A, L
POP HL
; if a == l then probably no timer
SUB L
RET
; c = divisor
; hl = dividend
; a <- remainder
; c <- divisor unchanged
; hl <- quotient
divide_16_by_8:
XOR A
LD B, 16
div_loop:
ADD HL, HL
RLA
JR C, div_overflow
CP C
JR C, div_zero
div_overflow:
INC L
SUB C
div_zero:
DJNZ div_loop
RET
MSG_BENCHMARK:
.DB "Benchmarking CPU ...", 0
#ENDIF
;
;------------------------------------------------------------------------------
; Probe HBIOS for devices and patch in I/O ports for devices
@ -1418,8 +1571,8 @@ cfgports: ret
; Setup frame delay value - Loop count for DJNZ $ loop
;------------------------------------------------------------------------------
;
#IF ((delay_type==cpu_loop) | (delay_type==hbios_tmr))
setfdelay:
#IF (delay_type==cpu_loop)
#IF (plt_romwbw)
LD BC,$F8F0 ; GET CPU SPEED
RST 08 ; FROM HBIOS

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