FIR低通滤波
HIGHPASS .set 0 ;if you want to use ,please set the value to 1
BANDPASS .set 0
LOWPASS .set 1
.global start,fir
.mmregs
COFF_FIR_START: .sect "coff_fir"
.if LOWPASS
.include "lowpass\lowpass.inc"
.elseif BANDPASS
.include "bandpass\bandpass.inc"
.else
.include "highpass\highpass.inc"
.endif
K_FIR_BFFR .set 32
d_data_buffer .usect "fir_bfr",64
FIR_DP .usect "fir_vars",0
d_filin .usect "fir_vars",1
d_filout .usect "fir_vars",100h
output .usect "fir_vars",1
.asg AR4,FIR_DATA_P
.asg AR6,INBUF_P
.asg AR7,OUTBUF_P
.asg AR3,OUTBUF
.sect "fir_prog"
nop
start:
LD #FIR_DP,DP
STM #d_data_buffer,FIR_DATA_P
RPTZ A,#K_FIR_BFFR-1
STL A,*FIR_DATA_P+
STM #d_filin,INBUF_P
STM #d_filout,OUTBUF_P
STM #output,OUTBUF
STM #100h,BK
fir_loop:
NOP ;Add Breakpoint & porbe point
LD *INBUF_P,A
CALL fir
STH A,*OUTBUF_P+%
STH A,*OUTBUF
main_end:
b fir_loop
fir:
; SSBX SXM
; SSBX FRCT
STM #d_data_buffer,FIR_DATA_P
STL A,*FIR_DATA_P
STM #(d_data_buffer+K_FIR_BFFR-1),FIR_DATA_P
fir_task:
RPTZ A,#K_FIR_BFFR-1
MACD *FIR_DATA_P-,COFF_FIR_START,A
RET
.end |
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