From dd3c897b0cfde003d744ad9438c28183175b953d Mon Sep 17 00:00:00 2001
From: David Schmenk <dschmenk@gmail.com>
Date: Sun, 10 Jul 2016 22:43:00 -0700
Subject: [PATCH] audio experiments

---
 src/libsrc/tone.pla | 121 ++++++++++++++++++++++++++++++++++++++++++++
 src/makefile        |   7 ++-
 2 files changed, 127 insertions(+), 1 deletion(-)
 create mode 100644 src/libsrc/tone.pla

diff --git a/src/libsrc/tone.pla b/src/libsrc/tone.pla
new file mode 100644
index 0000000..a2b46e4
--- /dev/null
+++ b/src/libsrc/tone.pla
@@ -0,0 +1,121 @@
+export asm tone(pitch, duration)
+!SOURCE	"vmsrc/plvmzp.inc"
+	DEX
+	LDA	ESTKL+1,X
+	STA	ESTKL,X
+	LDA	ESTKH+1,X
+	STA	ESTKH,X
+	LDA	#$00
+	STA	ESTKL+1,X
+	STA	ESTKH+1,X
+end
+export asm tone2(pitch1, pitch2, duration)
+	STX	ESP
+	LDY	ESTKH,X
+	LDA	ESTKL,X
+	BEQ	+
+	INY
++	STA	DSTL
+	STY	DSTH
+       	LDA	ESTKL+1,X
+	STA	TMPL
+	LDA	ESTKL+2,X
+	CMP	TMPL
+	BNE	+
+	LDA	#$00
++	STA	TMPH
+	LDY	TMPL
+	LDX	TMPH
+	LDA	#$00
+	PHP
+	SEI
+-	CLC
+--	DEY
+	BNE	+
+	LDY	TMPL
+	BEQ	++		; SILENCE
+	STA	$C030
+	BNE	+++
++	NOP
+	NOP
+++	NOP
+	NOP
+	NOP
++++	DEX
+	BNE	+
+	LDX	TMPH
+	BEQ	++		; SILENCE
+	STA	$C030
+	BNE	+++
++	NOP
+	NOP
+++	NOP
+	NOP
+	NOP
++++	ADC	#$01
+	BNE	--
+	DEC	DSTL
+	BNE 	-
+	DEC	DSTH
+	BNE	-
+	PLP
+	LDX	ESP
+	INX
+	INX
+	RTS
+end
+export asm tonePWM(sample, speed, len)
+	STX	ESP
+	LDA	ESTKL,X
+	BEQ	+
+	INC	ESTKH,X
++	LDA	ESTKL+2,X
+	STA	SRCL
+	LDA	ESTKH+2,X
+	STA	SRCH
+	LDA	ESTKL+1,X
+	BNE	++
+	LDY	#$00
+-	LDA	(SRC),Y
+	SEC
+--	SBC	#$01
+	BCS	--
+	LDA	$C030
+	INY
+	BNE	+
+	INC	SRCH
++	LDX	ESP
+	DEC	ESTKL,X
+	BNE 	-
+	DEC	ESTKH,X
+	BNE	-
+	INX
+	RTS
+++	STA	TMPL
+	LDY	#$00
+-	LDA	(SRC),Y
+	SEC
+--	LDX	TMPL
+---	DEX
+	BNE	---
+	SBC	#$01
+	BCS	--
+	LDA	$C030
+	INY
+	BNE	+
+	INC	SRCH
++	LDX	ESP
+	DEC	ESTKL,X
+	BNE 	-
+	DEC	ESTKH,X
+	BNE	-
+	INX
+	RTS
+++
+end
+def toneTest
+	byte t
+	tonePWM($D000, 0, $2000)
+end
+toneTest()
+done
\ No newline at end of file
diff --git a/src/makefile b/src/makefile
index 96b66ea..6d1917b 100644
--- a/src/makefile
+++ b/src/makefile
@@ -17,6 +17,7 @@ INET    = INET\#FE1000
 DHCP    = DHCP\#FE1000
 HTTPD   = HTTPD\#FE1000
 DGR     = DGR\#FE1000
+TONE    = TONE\#FE1000
 ROGUE   = ROGUE\#FE1000
 ROGUEIO = ROGUEIO\#FE1000
 ROGUEMAP= ROGUEMAP\#FE1000
@@ -51,7 +52,7 @@ TXTTYPE	= .TXT
 #SYSTYPE	= \#FF2000
 #TXTTYPE	= \#040000
 
-all: $(PLASM) $(PLVM) $(PLVM01) $(PLVM02) $(PLVM03) $(CMD) $(MEMMGR) $(MEMTEST) $(FIBER) $(SB) $(MON) $(ROD) $(SIEVE) $(UTHERNET2) $(UTHERNET) $(ETHERIP) $(INET) $(DHCP) $(HTTPD) $(ROGUE) $(ROGUEMAP) $(ROGUECOMBAT) $(ROGUEIO) $(HGR1) $(DGR) $(DGRTEST)
+all: $(PLASM) $(PLVM) $(PLVM01) $(PLVM02) $(PLVM03) $(CMD) $(MEMMGR) $(MEMTEST) $(FIBER) $(SB) $(MON) $(ROD) $(SIEVE) $(UTHERNET2) $(UTHERNET) $(ETHERIP) $(INET) $(DHCP) $(HTTPD) $(ROGUE) $(ROGUEMAP) $(ROGUECOMBAT) $(ROGUEIO) $(HGR1) $(TONE) $(DGR) $(DGRTEST)
 
 clean:
 	-rm *FE1000 *FF2000 $(PLASM) $(PLVM) $(PLVM01) $(PLVM02) $(PLVM03)
@@ -156,6 +157,10 @@ $(HTTPD): samplesrc/httpd.pla $(PLVM02) $(PLASM)
 	./$(PLASM) -AM < samplesrc/httpd.pla > samplesrc/httpd.a
 	acme --setpc 4094 -o $(HTTPD) samplesrc/httpd.a
 
+$(TONE): libsrc/tone.pla $(PLVM02) $(PLASM)
+	./$(PLASM) -AM < libsrc/tone.pla > libsrc/tone.a
+	acme --setpc 4094 -o $(TONE) libsrc/tone.a
+
 $(DGR): libsrc/dgr.pla $(PLVM02) $(PLASM)
 	./$(PLASM) -AM < libsrc/dgr.pla > libsrc/dgr.a
 	acme --setpc 4094 -o $(DGR) libsrc/dgr.a