working lead, just need to shift it
This commit is contained in:
Joachim Fenkes
parent
cacd33a846
commit
94efc9ea5b
202
avr/noiseplug.s
202
avr/noiseplug.s
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@ -15,13 +15,19 @@ PORTB = 0x02
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DDRB = 0x01
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PINB = 0x00
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LEADSIZE = 174
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LEADINIT1 = 1601
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LEADINIT2 = 3571
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.section .bss
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.comm int_ctr, 1
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.comm i, 3
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.comm lead1, 4
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.comm lead2, 4
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.comm lead3, 4
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.comm bassosc, 2
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.comm bassflange, 2
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.comm arposc, 2
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@ -56,10 +62,23 @@ main_cont:
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clr r31
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ldi r30, 0x40
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clearsram:
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clear_sram:
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st Z+, r16
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sbrs r30, 5
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rjmp clearsram
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rjmp clear_sram
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; ldi r18, LEADSIZE
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; sts leadptr1, r18
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; sts leadptr2, r18
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; sts leadptr3, r18
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; ldi r18, hi8(LEADINIT1)
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; sts leadosc2, r18
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; ldi r18, lo8(LEADINIT1)
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; sts leadosc2 + 1, r18
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; ldi r18, hi8(LEADINIT2)
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; sts leadosc3, r18
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; ldi r18, lo8(LEADINIT2)
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; sts leadosc3 + 1, r18
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out CCP, r17
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out CLKPSR, r16
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@ -263,11 +282,173 @@ arptiming_noshift:
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subi r16, -35
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noarp:
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; ==== LEAD ===
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clr r29
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ldi r28, lead1
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ldi r24, 0
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ldi r25, ~1
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rcall lead_voice
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add r16, r23
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;ldi r28, lead2
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;ldi r24, 4
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;ldi r25, ~2
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;rcall lead_voice
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;lsr r23
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;lsr r23
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;add r16, r23
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;lsr r23
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;add r16, r23
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;ldi r28, lead3
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;ldi r24, 8
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;ldi r25, ~4
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;rcall lead_voice
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;lsr r23
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;lsr r23
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;add r16, r23
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out OCR0AL, r16
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cbi PORTB, 2
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rjmp mainloop
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; input:
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; dataset pointer in Y
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; inverted boost mask in r25
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; voice delay (4 * voice_nr) in r24
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; returns sample in r23
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skiplead_top:
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clr r23
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ret
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lead_voice:
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ld r23, Y+ ; r23 = leadptr
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cpi r23, LEADSIZE
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brne noleadsetup
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cpi r17, 4
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brne skiplead_top
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cp r18, r24 ; r24 no longer needed now!
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brne skiplead_top
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dec r28
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ldi r20, -1
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st Y+, r20
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ldi r20, 1
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st Y, r20
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noleadsetup:
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lds r26, boost ; r26 = boost
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ld r27, Y ; r27 = leadtimer
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; if (0 == (i & 0xFF)): clear boost
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tst r19
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brne checkleadtimer
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and r26, r25
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sts boost, r26
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; if (0 == i & 0x1FF): leadtimer--
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sbrc r18, 0
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rjmp checkleadtimer
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dec r27
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st Y, r27
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checkleadtimer:
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; if (0 == leadtimer): leadptr++
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tst r27
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brne getleaddata
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; leadptr++
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dec r28
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inc r23
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st Y+, r23
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getleaddata:
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; leadptr(4..7) = leadseq[leadptr >> 4];
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mov r30, r23
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andi r23, 0xF
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swap r30
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andi r30, 0xF
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subi r30, lo8(NULL-leadseq)
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ld r30, Z
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swap r30
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or r30, r23
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; data = leaddata[leadptr]
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subi r30, lo8(NULL-leaddata)
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ld r24, Z ; r24 = data!
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; if (0 == leadtimer) {
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neg r25
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tst r27
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brne noleadupdate
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; leadtimer = leadtimes[data >> 5]
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mov r30, r24
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swap r30
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lsr r30
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andi r30, 7
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subi r30, lo8(NULL-leadtimes)
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ld r27, Z
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st Y, r27
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; boosts |= boostmask
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or r26, r25
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sts boost, r26
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noleadupdate:
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; data &= 0x1F
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andi r24, 0x1F
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; note = notes[data]
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ldi r30, lo8(notes)
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lsl r24
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add r30, r24
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ld r21, Z+
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ld r20, Z
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; leadosc += note
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inc r28
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ld r22, Y+
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ld r23, Y
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add r23, r21
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adc r22, r20
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st Y, r23
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st -Y, r22
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; sample = ((lead_osc >> 7) & 0x3F) + ((lead_osc >> 7) & 0x1F)
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rol r23
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rol r22
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andi r22, 0x3F
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mov r23, r22
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andi r22, 0x1F
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add r23, r22 ; r23 = final boosted sample!
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; if (!(boost & boostmask)): take three quarters
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and r26, r25
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brne noreduce
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lsr r23
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mov r22, r23
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lsr r23
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add r23, r22
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noreduce:
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; if (data == 0) return 0;
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tst r24
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breq skiplead
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ret
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skiplead:
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clr r23
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ret
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.org 0x300
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notes:
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@ -302,4 +483,19 @@ arpeggio:
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.byte 0x24, 0x59
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.byte 0x24, 0x58
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.byte 0x57, 0xAD
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.byte 0x35, 0x9B
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.byte 0x35, 0x9B
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leadtimes:
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.byte 1, 2, 3, 4, 5, 6, 28, 14
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leaddata:
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.byte 0x67, 0x24, 0x20, 0x27, 0x20, 0x28, 0x89, 0x0, 0x28, 0x20, 0x27, 0x20, 0x28, 0x89, 0x0, 0x28
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.byte 0x20, 0x27, 0x20, 0x28, 0x86, 0x0, 0x44, 0x0, 0x63, 0x24, 0x62, 0xA1, 0xE0, 0xE0, 0xE0, 0xE0
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.byte 0x20, 0x29, 0x20, 0x2A, 0x8B, 0x0, 0x4E, 0x0, 0x6F, 0x30, 0x71, 0xAF, 0xE0, 0xE0, 0xE0, 0xE0
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.byte 0x20, 0x29, 0x20, 0x2A, 0x8B, 0x0, 0x4E, 0x0, 0x6F, 0x30, 0x6F, 0xAC, 0xE0, 0xE0, 0xE0, 0xE0
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.byte 0x65, 0x22, 0x20, 0x65, 0x26, 0x87, 0x0, 0x68, 0x69, 0x2B, 0xAA, 0xC0, 0x67, 0x24, 0x20, 0x67
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.byte 0x28, 0x89, 0x0, 0x68, 0x69, 0x2B, 0xAA, 0xC0, 0x65, 0x22, 0x20, 0x65, 0x26, 0xA7, 0x28, 0x20
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.byte 0x69, 0x2B, 0xAA, 0x29, 0x20, 0x68, 0x29, 0xAA, 0x2B, 0x20, 0x69, 0x28, 0x69, 0x67
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leadseq:
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.byte 0, 1, 0, 2, 0, 1, 0, 3, 4, 5, 6
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