dsp的課程設(shè)計(jì)word版(編輯修改稿)
2025-07-11 11:26 本頁面
【文章內(nèi)容簡(jiǎn)介】 cosine1, *AR1+ CALL bit_rev CALL fft CALL power RET ************************ 位碼倒置程序 bit_rev ******************* .asg AR2, REORDERED .asg AR3,ORIGINAL_INPUT .asg AR7, DATA_PROC_BUF .sect rfft_prg 。bit_rev: STM d_input, ORIGINAL_INPUT STM fft_data, DATA_PROC_BUF MVMM DATA_PROC_BUF, REORDERED STM K_FFT_SIZE1, BRC RPTBD bit_rev_end1 STM K_FFT_SIZE, AR0 MVDD *ORIGINAL_INPUT+, *REORDERED+ MVDD *ORIGINAL_INPUT, *REORDERED+ MAR *ORIGINAL_INPUT+0B 。bit_rev_end: RET 。*********************** FFT 算法子程序 fft **********************。 .asg AR1, GROUP_COUNTER .asg AR2, PX .asg AR3, QX .asg AR4, WR 9 .asg AR5, WI .asg AR6, BUTTERFLY_COUNTER .asg AR7, STAGE_COUNTER .sect rfft_prg fft: 。***********第 1 級(jí)蝶形運(yùn)算 stage1**************: STM 0, BK LD 1, ASM STM fft_data, PX LD *PX, 16, A STM fft_data+K_DATA_IDX_1,QX STM K_FFT_SIZE/21, BRC RPTBD stage_end1 STM K_DATA_IDX_1+1, AR0 SUB *QX, 16, A, B ADD *QX, 16, A STH A, ASM, *PX+ ST B, *QX+ ||LD *PX, A SUB *QX, 16, A, B ADD *QX, 16, A STH A, ASM, *PX+0 ST B, *QX+0% ||LD *PX, A 。stage1_end: 。***********第 2 級(jí)蝶形運(yùn)算 stage2**************。 STM fft_data, PX STM fft_data+K_DATA_IDX_2, QX STM K_FFT_SIZE/4
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