The Atari Compendium

home *** CD-ROM | disk | FTP | other *** search

/ The Atari Compendium / The Atari Compendium (Toad Computers) (1994).iso / files / prgtools / programm.ing / falcon / a56v12st.lzh / a56 / examples / flange.lis < prev next >

Wrap

File List | 1994-09-02 | 11.0 KB | 327 lines

;*************************************************************** ; ; Stereo Flange for the DSP56001 processor ; Developed by Quinn Jensen (jensenq@qcj.icon.com) ; ;*************************************************************** include "tdsg.a56" P:0076 dot X:0020 org x:$20 ; Sample rate 32.5500 kc ; ; Delay time (1-12) 6.0000 ms ; Depth (1-10) 10.0000 ; Speed (1-10) 1.0000 ; Regen (1-10) 9.0000 ; ; max depth +/- 6.0000 ms ; min delay 1.0000 ms ; max delay 12.0000 ms ; 1/2 cycle period 4.5100 s ; samples per 1/2 cyc 146800.5000 ; time delta/samp 0.0817 us ; offset samp/samp 0.0027 ; FFFFDF doff_i equ -33 0.00266075 ddeltaf equ 0.0026607539 023D70 dspeed_i equ 146800 0.888889 dregen equ 0.8888888889 002000 delay equ $2000 001000 dmax equ 4096 ;125 ms X:0020 FFFFDF doff dc doff_i ;current delay distance Y:0020 org y:doff Y:0020 000000 dc 0 X:0021 org x:doff+1 X:0021 000000 ddelta dc 0 ; Y:0021 org y:ddelta Y:0021 005730 dc ddeltaf X:0022 org x:ddelta+1 X:0022 023D70 dspeed dc dspeed_i X:0023 000000 dtoggle dc 0 ; X:0024 delayout X:0024 000000 dc 0 Y:0000 org y:$0 P:0076 org p:dot ;go back to P-space ; ; non-interrupt code ; P:0076 hf_init P:0076 61F400 move #delay,r1 ;delay line input P:0077 002000 P:0078 05F421 movec #dmax-1,m1 ; P:0079 000FFF P:007A 71F400 move #doff_i,n1 ;distance to output P:007B FFFFDF P:007C 00000C rts ; ; fs = 32.552083 kHz ; P:007D hf_comp P:007D 0D0066 jsr <saveregs ; ; output and input mix ; P:007E 253813 clr a #.4375,x1 ;clr a, get input scale P:007F 27401B clr b #.5,y1 ;clr b, get output scaler P:0080 46A400 move x:<delayout,y0 ;get delay out P:0081 44F400 move #.70,x0 ;do regen term P:0082 59999A P:0083 2000D3 macr x0,y0,a P:0084 2000D3 macr x0,y0,a P:0085 246000 move #.75,x0 P:0086 4480DB macr y0,x0,b x:<in_l,x0 ;b = .5 * delay, x0=in_l P:0087 21E6CB macr x0,y1,b b,y0 ;b += .5 * in_l, y0=b P:0088 5704A3 macr x0,x1,a b,x:<out_l ;a += x1 * in_l, L = b P:0089 20CF00 move y0,b ;b = -y0 P:008A 44813E neg b x:<in_r,x0 ;x0 = in_r P:008B 2000CB macr x0,y1,b ;b += .5 * in_r P:008C 5705A3 macr x0,x1,a b,x:<out_r ;R = b, a += x1 * in_r ; ; delay line in ; P:008D 565900 move a,x:(r1)+ ; ; delay line length modulation ; P:008E 48A000 move l:<doff,a ;a = current offset P:008F 42A100 move l:<ddelta,x ;x = current delta P:0090 200020 add x,a P:0091 482000 move a,l:<doff ;new offset = a + x P:0092 219900 move a1,n1 P:0093 20AF00 move x1,b ;save delta for later use ; smoothly transition between delay-line offsets by ; interpolating the current sample with the previous or next ; one depending on whether the delay is currently getting longer or ; shorter. Otherwise, an obnoxious click results when the offset snaps ; to the next integral value. P:0094 5EA000 move y:<doff,a ;compute |frac(doff)| P:0095 44F423 lsr a #$800000,x0 P:0096 800000 P:0097 254042 or x0,a #.5,x1 P:0098 218400 move a1,x0 P:0099 2000A4 mpy -x0,x1,a P:009A 21C60B tst b a,y0 ;y0 = 0.5 * |frac(doff)| P:009B 0AF0A3 jpl shorter ;on positive delta, the P:009C 0000A6 ;delay is shortening P:009D 205100 move (r1)- ;get previous sample P:009E 44E900 move x:(r1+n1),x0 P:009F 2F40D0 mpy y0,x0,a #.5,b ;scale P:00A0 20595C sub y0,b (r1)+ ;compute scale for cur sample P:00A1 21E600 move b,y0 P:00A2 44E900 move x:(r1+n1),x0 ;get cur sample P:00A3 2000D2 mac x0,y0,a ;scale and sum P:00A4 0AF080 jmp endpan P:00A5 0000AC P:00A6 shorter P:00A6 44E900 move x:(r1+n1),x0 ;get cur sample P:00A7 2F40D0 mpy y0,x0,a #.5,b ;scale P:00A8 20595C sub y0,b (r1)+ ;compute scale for next sample P:00A9 21E600 move b,y0 P:00AA 44E900 move x:(r1+n1),x0 ;get next sample P:00AB 2051D2 mac x0,y0,a (r1)- ;scale and sum P:00AC endpan P:00AC 562400 move a,x:<delayout ;store resulting output ; update the triangle wave modulation P:00AD 56A300 move x:<dtoggle,a ;decrement toggle count P:00AE 44F400 move #>1,x0 P:00AF 000001 P:00B0 200044 sub x0,a P:00B1 562300 move a,x:<dtoggle P:00B2 0AF0A7 jgt notogg ;time to toggle? P:00B3 0000B8 P:00B4 44A200 move x:<dspeed,x0 ;yes, negate delta and reset P:00B5 48A100 move l:<ddelta,a P:00B6 442336 neg a x0,x:<dtoggle P:00B7 482100 move a,l:<ddelta P:00B8 notogg P:00B8 bypass P:00B8 0D006F jsr <restregs P:00B9 00000C rts end Summary of psect usage section seg base last top used avail total ------------------------------------------------------------------------- Symbol Table ------------------------------------- ddelta 000021 ddeltaf 0.0026607539 ssi_int 000061 ssix 000010 notogg 0000B8 delayout 000024 delay 002000 init_stereo 000059 start 000040 in_rs 000003 in_ls 000002 in_r 000001 in_l 000000 dmax 001000 endpan 0000AC doff 000020 doff_i FFFFDF dot 000076 mainloop 000060 hf_comp 00007D hf_init 000076 dtoggle 000023 saveregs 000066 savey 00000B savex 00000A saveb2 000009 saveb10 000008 savea2 000007 savea10 000006 dregen 0.8888888889 dspeed 000022 dspeed_i 023D70 restregs 00006F out_r 000005 out_l 000004 bypass 0000B8 shorter 0000A6 m_scl1 00000F m_scl0 00000E m_scl 00C000 m_ssl1 00000D m_ssl0 00000C m_ssl 003000 m_hpl1 00000B m_hpl0 00000A m_hpl 000C00 m_ibl2 000005 m_ibl1 000004 m_ibl0 000003 m_ibl 000038 m_ial2 000002 m_ial1 000001 m_ial0 000000 m_ial 000007 m_ipr 00FFFF m_rdf 000007 m_tde 000006 m_roe 000005 m_tue 000004 m_rfs 000003 m_tfs 000002 m_if1 000001 m_if0 000000 m_if 000002 m_srie 00000F m_stie 00000E m_sre 00000D m_ste 00000C m_mod 00000B m_gck 00000A m_syn 000009 m_fsl 000008 m_sckd 000005 m_scd2 000004 m_scd1 000003 m_scd0 000002 m_scd 00001C m_of1 000001 m_of0 000000 m_of 000003 m_psr 00000F m_wl1 00000E m_wl0 00000D m_wl 006000 m_dc 001F00 m_pm 0000FF m_tsr 00FFEE m_sr 00FFEE m_crb 00FFED m_cra 00FFEC m_tx 00FFEF m_rx 00FFEF m_tcm 00000F m_rcm 00000E m_scp 00000D m_cod 00000C m_cd 000FFF m_r8 000007 m_fe 000006 m_pe 000005 m_or 000004 m_idle 000003 m_rdrf 000002 m_tdre 000001 m_trne 000000 m_tmie 00000D m_tie 00000C m_rie 00000B m_ilie 00000A m_te 000009 m_re 000008 m_woms 000007 m_rwi 000006 m_wake 000005 m_sbk 000004 m_wds2 000002 m_wds1 000001 m_wds0 000000 m_wds 000003 m_sccr 00FFF2 m_ssr 00FFF1 m_scr 00FFF0 m_stxa 00FFF3 m_stxh 00FFF6 m_stxm 00FFF5 m_stxl 00FFF4 m_srxh 00FFF6 m_srxm 00FFF5 m_srxl 00FFF4 m_dma 000007 m_hf1 000004 m_hf0 000003 m_hf 000018 m_hcp 000002 m_htde 000001 m_hrdf 000000 m_hf3 000004 m_hf2 000003 m_hcie 000002 m_htie 000001 m_hrie 000000 m_htx 00FFEB m_hrx 00FFEB m_hsr 00FFE9 m_hcr 00FFE8 m_pcd 00FFE5 m_pcddr 00FFE3 m_pcc 00FFE1 m_pbd 00FFE4 m_pbddr 00FFE2 m_pbc 00FFE0 m_bcr 00FFFE errors=0