fir_filter.inc

熟悉dsp开发环境ccs之FIR算法实验.工程文件sine_fir.prj

;filename: fir_filter.inc
                 .text
fir_init:
                 STM        #fir_coff_tbl,AR5
                 RPT        #127
                 MVPD    #fir_coff,*AR5+
                 STM       #data_buf,AR4
                 RPTZ      A,#127
                 STL         A,*AR4+
                 STM        #data_buf,AR4
                 STM        #1,AR0
                 RETD
                 STM        #fir_coff_tbl,AR5
fir_task:
                 STM         #res_buf,AR7
                 STM         #sin_noise,AR6
                 STM         #255,BRC
                 RPTBD     fir_flt_loop-1
                 STM          #128,BK
                 LD             *AR6+,A
fir_filter:
                  STL          A,*AR4+%
                  RPTZ       A,#127
                  MAC        *AR5+0%,*AR4+0%,A
                  SFTL        A,1
                  STH          A,*AR7+
fir_flt_loop:
                  RET