cc65/libsrc/pce/psg.s

        .include        "pce.inc"

        .export         psg_init

        .segment        "ONCE"
psg_init:
        clx
        stz     PSG_GLOBAL_PAN          ; Clear global balance

psg_clear_loop:
        stx     PSG_CHAN_SELECT         ; Select channel
        stz     PSG_FREQ_LO             ; Clear frequency LSB
        stz     PSG_FREQ_HI             ; Clear frequency MSB
        stz     PSG_CHAN_CTRL           ; Clear volume
        stz     PSG_CHAN_PAN            ; Clear balance
        stz     PSG_NOISE               ; Clear noise control
        stz     PSG_LFO_FREQ            ; Clear LFO frequency
        stz     PSG_LFO_CTRL            ; Clear LFO control

        cly
psg_clear_waveform:
        stz     PSG_CHAN_DATA           ; Clear waveform byte
        iny
        cpy     #$20
        bne     psg_clear_waveform

        inx
        cpx     #$06
        bne     psg_clear_loop
        rts
style fixes 2015-08-29 13:58:57 +00:00			`.include "pce.inc"`
more cleanup, joystick works again 2015-07-12 12:27:24 +00:00
style fixes 2015-08-29 13:58:57 +00:00			`.export psg_init`
initial import, completely untested, does not compile yet 2014-11-29 13:18:48 +00:00
Renamed INITBSS to INIT and INIT to ONCE. The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name. Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization. 2016-03-06 20:26:22 +00:00			`.segment "ONCE"`
initial import, completely untested, does not compile yet 2014-11-29 13:18:48 +00:00			`psg_init:`
style fixes 2015-08-29 13:58:57 +00:00			`clx`
fix gregs complaints :) 2015-09-04 12:14:17 +00:00			`stz PSG_GLOBAL_PAN ; Clear global balance`

initial import, completely untested, does not compile yet 2014-11-29 13:18:48 +00:00			`psg_clear_loop:`
fix gregs complaints :) 2015-09-04 12:14:17 +00:00			`stx PSG_CHAN_SELECT ; Select channel`
			`stz PSG_FREQ_LO ; Clear frequency LSB`
			`stz PSG_FREQ_HI ; Clear frequency MSB`
			`stz PSG_CHAN_CTRL ; Clear volume`
			`stz PSG_CHAN_PAN ; Clear balance`
			`stz PSG_NOISE ; Clear noise control`
			`stz PSG_LFO_FREQ ; Clear LFO frequency`
			`stz PSG_LFO_CTRL ; Clear LFO control`
initial import, completely untested, does not compile yet 2014-11-29 13:18:48 +00:00
style fixes 2015-08-29 13:58:57 +00:00			`cly`
			`psg_clear_waveform:`
fix gregs complaints :) 2015-09-04 12:14:17 +00:00			`stz PSG_CHAN_DATA ; Clear waveform byte`
style fixes 2015-08-29 13:58:57 +00:00			`iny`
			`cpy #$20`
			`bne psg_clear_waveform`
initial import, completely untested, does not compile yet 2014-11-29 13:18:48 +00:00
style fixes 2015-08-29 13:58:57 +00:00			`inx`
			`cpx #$06`
			`bne psg_clear_loop`
			`rts`