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Assembly Source File | 1987-09-14 | 5.9 KB | 340 lines

org 0 b go org 0FF0H dw 2731 org 10H sine: equ 0 one: equ 1 freq: equ 2 phase: equ 3 maskl: equ 6 mask: equ 7 sinx: equ 8 cosx: equ 9 mone: equ 11 wkph: equ 13 masko: equ 14 mps: equ 15 siny: equ 17 mpc: equ 18 cosy: equ 21 cosine: equ 19 coph: equ 20 sintbl: dw 0 ; coarse sine table dw 804 dw 1607 dw 2410 dw 3211 dw 4011 dw 4807 dw 5601 dw 6392 dw 7179 dw 7961 dw 8739 dw 9511 dw 10278 dw 11038 dw 11792 dw 12539 dw 13278 dw 14009 dw 14732 dw 15446 dw 16150 dw 16845 dw 17530 dw 18204 dw 18867 dw 19519 dw 20159 dw 20787 dw 21402 dw 22004 dw 22594 dw 23169 dw 23731 dw 24278 dw 24811 dw 25329 dw 25831 dw 26318 dw 26789 dw 27244 dw 27683 dw 28105 dw 28510 dw 28897 dw 29268 dw 29621 dw 29955 dw 30272 dw 30571 dw 30851 dw 31113 dw 31356 dw 31580 dw 31785 dw 31970 dw 32137 dw 32284 dw 32412 dw 32520 dw 32609 dw 32678 dw 32727 dw 32757 dw 32767 fines: dw 0 ; fine tuning table dw 12 dw 25 dw 37 dw 50 dw 62 dw 75 dw 87 dw 100 dw 113 dw 125 dw 138 dw 150 dw 163 dw 175 dw 188 dw 201 dw 213 dw 226 dw 238 dw 251 dw 263 dw 276 dw 289 dw 301 dw 314 dw 326 dw 339 dw 351 dw 364 dw 376 dw 389 dw 402 dw 414 dw 427 dw 439 dw 452 dw 464 dw 477 dw 490 dw 502 dw 515 dw 527 dw 540 dw 552 dw 565 dw 578 dw 590 dw 603 dw 615 dw 628 dw 640 dw 653 dw 665 dw 678 dw 691 dw 703 dw 716 dw 728 dw 741 dw 753 dw 766 dw 779 dw 791 finec: dw 32767 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32766 dw 32765 dw 32765 dw 32765 dw 32765 dw 32765 dw 32765 dw 32765 dw 32765 dw 32764 dw 32764 dw 32764 dw 32764 dw 32764 dw 32764 dw 32764 dw 32763 dw 32763 dw 32763 dw 32763 dw 32763 dw 32762 dw 32762 dw 32762 dw 32762 dw 32762 dw 32761 dw 32761 dw 32761 dw 32761 dw 32760 dw 32760 dw 32760 dw 32760 dw 32759 dw 32759 dw 32759 dw 32759 dw 32758 dw 32758 dw 32758 dw 32758 dw 32757 dw 32757 go: ldpk 0 lack one sacl one lac one,11 sacl masko zac sub one sacl mone ; make and store minus one lac one,14 sub one sacl mask ; make and store mask for modulo 16384 phase arithmetic lac one,6 sub one sacl maskl ; make and store fine part of address mask; zac sacl phase lac one,8 sub one sacl freq lac freq,4 tblr freq wait: bioz fire ; is it time for a new sample b wait ; nope go wait in the corner fire: out sine,pa4 ; send it out here so that timing is maintained ; as the following routines have a variable length lack one sacl mps sacl mpc lac phase,0 a: sacl wkph ; store a working copy lac wkph,4 subh one blz getem ; is it in a quadrant bigger than first? subh one bgez thfr; is it in a quadrant greater than two? lac 1,13 ; nope so load pi sub wkph ; subtract phase so that it maps back into 1st quad sacl wkph ; store lac mone ; load -1 sacl mpc ; store it in the cosine multiplier b getem ; go read tables thfr: lac mone ; multiplier for bottom half sacl mps ; store lac wkph ; sub one,13 ; map angle back to upper half and go do it again b a; getem: lac wkph,10 sach coph lack sintbl add coph tblr sinx lac one,6 sub coph sacl coph lack sintbl add coph tblr cosx lac wkph and maskl sacl coph lack fines add coph tblr siny lack finec add coph tblr cosy zac lt sinx mpy cosy lta siny mpy cosx apac sach sine lac 1,12 sub wkph sacl wkph lac wkph,10 sach coph lack sintbl add coph tblr sinx lac one,6 sub coph sacl coph lack sintbl add coph tblr cosx lac wkph and maskl sacl coph lack fines add coph tblr siny lack finec add coph tblr cosy zac lt sinx mpy cosy lta siny mpy cosx apac sach cosine mult: lt mps mpy sine pac sacl sine mpy cosine pac sacl cosine lt mpc mpy cosine pac sacl cosine lac cosine,5 ; move top twelve bits into high order word addh masko ; add offset for ADC format; sach sine,0 ; store output value lac phase ; get ready to add freq (measured in phase rotation ; per sample) add freq ; add phase rotation and mask ; do mod 16384 arithmetic sacl phase ; store it b wait ; go output and then do it again end