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added c64.RDTIM16() utility routine to just get the lower 16 bits of the jiffy clock

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This commit is contained in:
Irmen de Jong 2021-01-02 20:59:48 +01:00
parent 5a846bdeb5
commit f0930d8a18
11 changed files with 56 additions and 168 deletions
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29
compiler/res/prog8lib/c64/syslib.p8
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@ -245,6 +245,20 @@ asmsub STOP2() -> ubyte @A {
}}
}
asmsub RDTIM16() -> uword @AY {
; -- like RDTIM() but only returning the lower 16 bits for convenience
%asm {{
stx P8ZP_SCRATCH_REG
jsr c64.RDTIM
pha
txa
tay
pla
ldx P8ZP_SCRATCH_REG
rts
}}
}
; ---- C64 specific system utility routines: ----
@ -291,18 +305,9 @@ asmsub reset_system() {
}
sub wait(uword jiffies) {
uword current_time = 0
c64.SETTIM(0,0,0)
while current_time < jiffies {
; read clock
%asm {{
stx P8ZP_SCRATCH_REG
jsr c64.RDTIM
sta current_time
stx current_time+1
ldx P8ZP_SCRATCH_REG
}}
c64.SETTIM(0,0,0) ; TODO do the wait without resetting the jiffy clock
while c64.RDTIM16() < jiffies {
; wait till the time catches up
}
}

31
compiler/res/prog8lib/cx16/syslib.p8
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@ -73,6 +73,22 @@ asmsub STOP2() -> ubyte @A {
}}
}
asmsub RDTIM16() -> uword @AY {
; -- like RDTIM() but only returning the lower 16 bits for convenience
%asm {{
phx
jsr c64.RDTIM
pha
txa
tay
pla
plx
rts
}}
}
}
cx16 {
@ -415,18 +431,9 @@ _loop ldy #0
sub wait(uword jiffies) {
uword current_time = 0
c64.SETTIM(0,0,0)
while current_time < jiffies {
; read clock
%asm {{
phx
jsr c64.RDTIM
sta current_time
stx current_time+1
plx
}}
c64.SETTIM(0,0,0) ; TODO do the wait without resetting the jiffy clock
while c64.RDTIM16() < jiffies {
; wait till the time catches up
}
}

3
docs/source/todo.rst
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@ -2,8 +2,9 @@
TODO
====
- add syslib.rdtim16() function to wrap the RDTIM to read only the lower 16 bits of the jiffyclock - fix examples.
- move all str* builtin functions to a str library module
- make the syslib.wait() functions not reset the jiffy clock to 0
- move wait() and others? to sys.* block to unify them from c64.* and cx16.* separation
- detect variables that are written but never read - mark those as unused too and remove them, such as uword unused = memory("unused222", 20) - also remove the memory slab allocation
- hoist all variable declarations up to the subroutine scope *before* even the constant folding takes place (to avoid undefined symbol errors when referring to a variable from another nested scope in the subroutine)
- make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as '_'

12
examples/assembler/assem.p8
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@ -42,7 +42,6 @@ main {
txt.print_uw(amount)
txt.print(" mnemonics")
uword current_time = 0
c64.SETTIM(0,0,0)
uword total = 0
@ -58,16 +57,7 @@ main {
}
}
; read clock back
%asm {{
phx
jsr c64.RDTIM
sta current_time
stx current_time+1
plx
}}
uword current_time = c64.RDTIM16()
txt.print("\nDone.\nValid: ")
txt.print_uw(valid)
txt.print("\ninvalid: ")

10
examples/balls.p8
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@ -85,15 +85,7 @@ main {
;txt.print_uw(frame)
}
; read clock
uword jiffies
%asm {{
stx P8ZP_SCRATCH_REG
jsr c64.RDTIM
sta jiffies
stx jiffies+1
ldx P8ZP_SCRATCH_REG
}}
uword jiffies = c64.RDTIM16()
txt.print("\nbenchmark: ")
txt.print_uw(jiffies)
txt.print(" jiffies for 1000 frames.\n")

BIN
examples/compiled/hello.prg
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Binary file not shown.

17
examples/cube3d-float.p8
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@ -19,9 +19,10 @@ main {
sub start() {
float time=0.0
ubyte timer_jiffies
repeat {
c64.SETTIM(0,0,0)
rotate_vertices(time)
txt.clear_screenchars(' ')
draw_edges()
@ -30,17 +31,11 @@ main {
txt.plot(0,0)
txt.print("3d cube! floats. ")
%asm {{
stx P8ZP_SCRATCH_REG
jsr c64.RDTIM ; A/X/Y
sta timer_jiffies
lda #0
jsr c64.SETTIM
ldx P8ZP_SCRATCH_REG
}}
txt.print_ub(timer_jiffies)
ubyte jiffies = lsb(c64.RDTIM16())
txt.print_ub(jiffies)
txt.print(" jiffies/fr = ")
txt.print_ub(60/timer_jiffies)
txt.print_ub(60/jiffies)
txt.print(" fps")
;test_stack.test()

15
examples/cube3d-gfx.p8
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@ -37,25 +37,12 @@ main {
angley+=217
anglez+=452
wait_a_little_bit()
c64.wait(2)
; test_stack.test()
}
}
sub wait_a_little_bit() {
%asm {{
stx P8ZP_SCRATCH_REG
lda #0
jsr c64.SETTIM
- jsr c64.RDTIM
cmp #1
bne -
ldx P8ZP_SCRATCH_REG
rts
}}
}
sub rotate_vertices(ubyte ax, ubyte ay, ubyte az) {
; rotate around origin (0,0,0)

57
examples/hello.p8
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@ -1,57 +0,0 @@
%import syslib
%import textio
%import floats
%zeropage basicsafe
; Note: this program is compatible with C64 and CX16.
main {
sub start() {
txt.lowercase()
; use optimized routine to write text
txt.print("Hello!\n")
; use iteration to write text
str question = "How are you?\n"
ubyte char
for char in question
txt.chrout(char)
; use indexed loop to write characters
str bye = "Goodbye!\n"
for char in 0 to len(bye)-1
txt.chrout(bye[char])
ubyte time_lo
ubyte time_mid
ubyte time_hi
%asm {{
stx P8ZP_SCRATCH_REG
jsr c64.RDTIM ; A/X/Y
sta time_lo
stx time_mid
sty time_hi
ldx P8ZP_SCRATCH_REG
}}
float clock_seconds = ((mkword(time_mid, time_lo) as float) + (time_hi as float)*65536.0) / 60
float hours = floor(clock_seconds / 3600)
clock_seconds -= hours*3600
float minutes = floor(clock_seconds / 60)
clock_seconds = floor(clock_seconds - minutes * 60.0)
txt.print("system time (jiffy clock) is ")
floats.print_f(hours)
txt.chrout(':')
floats.print_f(minutes)
txt.chrout(':')
floats.print_f(clock_seconds)
txt.chrout('\n')
txt.print("bye!\n")
}
}

15
examples/mandelbrot.p8
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@ -40,20 +40,7 @@ main {
}
}
ubyte time_lo
ubyte time_mid
ubyte time_hi
%asm {{
stx P8ZP_SCRATCH_REG
jsr c64.RDTIM ; A/X/Y
sta time_lo
stx time_mid
sty time_hi
ldx P8ZP_SCRATCH_REG
}}
float duration = ((mkword(time_mid, time_lo) as float) + (time_hi as float)*65536.0) / 60
float duration = (c64.RDTIM16() as float) / 60
txt.plot(0, 21)
txt.print("finished in ")
floats.print_f(duration)

35
examples/test.p8
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@ -8,34 +8,15 @@ main {
sub start () {
uword current_time
uword secs
const uword test_value = 1261
current_time = test_value
secs = current_time / 60
current_time = (current_time - secs*60)*1000/60
txt.print_uw(secs)
txt.chrout('.')
if current_time<10
txt.chrout('0')
if current_time<100
txt.chrout('0')
txt.print_uw(current_time)
txt.chrout('\n')
current_time = test_value
secs = current_time / 60
current_time = current_time - secs*60
current_time *= 1000
current_time /= 60
txt.print_uw(secs)
txt.chrout('.')
if current_time<10
txt.chrout('0')
if current_time<100
txt.chrout('0')
txt.print_uw(current_time)
txt.chrout('\n')
repeat {
current_time = c64.RDTIM16()
txt.print_uw(current_time)
txt.chrout('\n')
repeat 20000 {
current_time++
}
}
; found = strfind("irmen de jong", ' ')