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added cx16.push_vera_context() and cx16.pop_vera_context() for use in irq handlers

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Irmen de Jong 2022-07-02 23:10:15 +02:00
parent 7fff4f249d
commit 064d412ec8
4 changed files with 73 additions and 14 deletions
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32
compiler/res/prog8lib/cx16/psg.p8
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@ -42,6 +42,7 @@ psg {
}
sub envelope(ubyte voice_num, ubyte attack, ubyte release) {
envelope_states[voice_num] = 255
envelope_attacks[voice_num] = attack * $0040
envelope_releases[voice_num] = release * $0040
if attack
@ -54,9 +55,9 @@ psg {
sub silent() {
for cx16.r15L in 0 to 15 {
volume(cx16.r15L, 0)
envelope_volumes[cx16.r15L] = 0
envelope_states[cx16.r15L] = 255
envelope_volumes[cx16.r15L] = 0
volume(cx16.r15L, 0)
}
}
@ -65,11 +66,7 @@ psg {
; cx16.r15L = the voice number
; the other virtual registers are used to backup vera registers.
cx16.r13L = cx16.VERA_CTRL
cx16.r13H = cx16.VERA_ADDR_L
cx16.r14L = cx16.VERA_ADDR_M
cx16.r14H = cx16.VERA_ADDR_H
; calculate new volumes
for cx16.r15L in 0 to 15 {
when envelope_states[cx16.r15L] {
0 -> {
@ -81,7 +78,6 @@ psg {
envelope_states[cx16.r15L] = 1 ; start release
}
envelope_volumes[cx16.r15L] = cx16.r0
volume(cx16.r15L, msb(cx16.r0)) ; TODO optimize to not use vpoke and use vera auto increment
}
1 -> {
; release
@ -91,14 +87,24 @@ psg {
envelope_releases[cx16.r15L] = 0
}
envelope_volumes[cx16.r15L] = cx16.r0
volume(cx16.r15L, msb(cx16.r0)) ; TODO optimize to not use vpoke and use vera auto increment
}
}
}
cx16.VERA_CTRL = cx16.r13L
cx16.VERA_ADDR_L = cx16.r13H
cx16.VERA_ADDR_M = cx16.r14L
cx16.VERA_ADDR_H = cx16.r14H
; set new volumes using vera stride of 4
cx16.push_vera_context()
cx16.VERA_CTRL = 0
cx16.VERA_ADDR_L = $c2
cx16.VERA_ADDR_M = $f9
cx16.VERA_ADDR_H = 1 | %00110000
cx16.VERA_CTRL = 1
cx16.VERA_ADDR_L = $c2
cx16.VERA_ADDR_M = $f9
cx16.VERA_ADDR_H = 1 | %00110000
for cx16.r15L in 0 to 15 {
cx16.VERA_DATA0 = cx16.VERA_DATA1 & %11000000 | msb(envelope_volumes[cx16.r15L])
}
cx16.pop_vera_context()
}
ubyte[16] envelope_states

46
compiler/res/prog8lib/cx16/syslib.p8
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@ -735,6 +735,52 @@ IRQ_SCRATCH_ZPWORD2 .word 0
}}
}
inline asmsub push_vera_context() clobbers(A) {
; -- use this at the start of your IRQ handler if it uses Vera registers, to save the state
%asm {{
lda cx16.VERA_ADDR_L
pha
lda cx16.VERA_ADDR_M
pha
lda cx16.VERA_ADDR_H
pha
lda cx16.VERA_CTRL
pha
eor #1
sta cx16.VERA_CTRL
lda cx16.VERA_ADDR_L
pha
lda cx16.VERA_ADDR_M
pha
lda cx16.VERA_ADDR_H
pha
lda cx16.VERA_CTRL
pha
}}
}
inline asmsub pop_vera_context() clobbers(A) {
; -- use this at the end of your IRQ handler if it uses Vera registers, to restore the state
%asm {{
pla
sta cx16.VERA_CTRL
pla
sta cx16.VERA_ADDR_H
pla
sta cx16.VERA_ADDR_M
pla
sta cx16.VERA_ADDR_L
pla
sta cx16.VERA_CTRL
pla
sta cx16.VERA_ADDR_H
pla
sta cx16.VERA_ADDR_M
pla
sta cx16.VERA_ADDR_L
}}
}
asmsub restore_irq() clobbers(A) {
%asm {{

7
docs/source/targetsystem.rst
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@ -156,3 +156,10 @@ And for the Commander X16::
cx16.set_rasterirq(uword handler_address, uword rasterline) ; note: disables kernal irq handler! sys.wait() won't work anymore
cx16.restore_irq() ; set everything back to the systems default irq handler
The Commander X16 provides two additional routines that should be used *in your IRQ handler routine* if it uses the Vera registers::
cx16.push_vera_context()
; ... do your work that uses vera here...
cx15.pop_vera_context()

2
docs/source/todo.rst
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@ -3,7 +3,7 @@ TODO
For next release
^^^^^^^^^^^^^^^^
- psg: use all 16 voices and see how many rasterlines the envelope interrupt handler takes
- fix push() pop() of vera registers
- if passing a subroutine or label name as an uword argument, without &, add the addressof automatically
- convert the sounds in cx16 tehtriz to use the psg module instead
- notify petaxian that it could use the psg module too?