cc65/libsrc/pce/psg.s

        .export         psg_init

        .include        "pce.inc"

        .segment        "ONCE"
psg_init:
        stz     PSG_GLOBAL_PAN          ; Silence global balance
        ldx     #6 - 1

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

        ldy     #$20
psg_clear_waveform:
        stz     PSG_CHAN_DATA           ; Clear waveform byte
        dey
        bne     psg_clear_waveform

        dex
        bpl     psg_clear_loop
        rts
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
Style changes. 2015-10-02 14:50:22 +00:00			`.include "pce.inc"`

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:`
Fixed and improved some pce comments. 2015-11-17 14:14:15 +00:00			`stz PSG_GLOBAL_PAN ; Silence global balance`
Fixed bugs; and, improved the efficiency of some pce library functions. 2015-11-26 20:06:20 +00:00			`ldx #6 - 1`
fix gregs complaints :) 2015-09-04 12:14:17 +00:00
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
Fixed bugs; and, improved the efficiency of some pce library functions. 2015-11-26 20:06:20 +00:00			`ldy #$20`
style fixes 2015-08-29 13:58:57 +00:00			`psg_clear_waveform:`
fix gregs complaints :) 2015-09-04 12:14:17 +00:00			`stz PSG_CHAN_DATA ; Clear waveform byte`
Fixed bugs; and, improved the efficiency of some pce library functions. 2015-11-26 20:06:20 +00:00			`dey`
style fixes 2015-08-29 13:58:57 +00:00			`bne psg_clear_waveform`
initial import, completely untested, does not compile yet 2014-11-29 13:18:48 +00:00
Fixed bugs; and, improved the efficiency of some pce library functions. 2015-11-26 20:06:20 +00:00			`dex`
			`bpl psg_clear_loop`
style fixes 2015-08-29 13:58:57 +00:00			`rts`