你好，请问：CNTL_2P2Z_F_ASM函数调用使用疑问，在C语言中调用_CNTL_2P2Z_F_ASM函数时需要怎样编写输入结构体变量和结构体系数赋值传给函数入参，计算结果怎样赋值传给变量，能否举例编写或提供应用历程，谢谢。
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.def _CNTL_2P2Z_F_ASM
_CNTL_2P2Z_F_ASM
; because of C calling convention
; XAR4 has the cntl2p2z coeff structure pointer
; XAR5 has the cntl2p2z data buff internal pointer
; R0H has the reference
; R1H has the feedback value
;save R4H
MOV32 @XAR6,R4H
PUSH XAR6
; calculate error (Ref - Fdbk)
MOV AR0,#10
MOV32 R0H,*+XAR5[AR0]
MOV AR0,#12
MOV32 R1H,*+XAR5[AR0]
SUBF32 R0H,R0H,R1H ; R0H = Ref(R0H) - Fdbk(R1H)= error(R0H)
NOP
; store error in DBUFF
MOV32 *+XAR5[4], R0H ; e(n) = ACC = error
; compute 2P2Z filter
MOV AR0,#8
MOV32 R0H, *+XAR5[AR0] ; R0H = e(n-2)
MOV32 R1H, *XAR4++ ; R1H = B2
MPYF32 R2H,R0H,R1H ; R2H = e(n-2)*B(2)
|| MOV32 R1H,*XAR4++ ; R1H = B1
MOVD32 R0H,*+XAR5[6] ; R0H = e(n-1) and e(n-2)=e(n-1)
MPYF32 R3H,R0H,R1H ; R3H = e(n-1)*B1
|| MOV32 R1H,*XAR4++ ; R1H = B0
MOVD32 R0H,*+XAR5[4] ; R0H = e(n) and e(n-1)=e(n)
MPYF32 R4H,R0H,R1H ; R4H = e(n)*B0 ,
|| ADDF32 R2H,R2H,R3H ; R2H = e(n-1)*B1+e(n-2)*B2
MOV32 R0H,*+XAR5[2] ; R0H = u(n-2)
MOV32 R1H,*XAR4++ ; R1H = A2
MPYF32 R3H,R0H,R1H ; R3H = u(n-2)*A2 ,
|| ADDF32 R2H,R2H,R4H ; R2H = e(n)*B0+e(n)*B0+e(n-1)*B1+e(n-2)*B2+e(n-3)*B3
MOVD32 R0H,*+XAR5[0] ; R0H = u(n-1), u(n-2) = u(n-1)
MOV32 R1H,*XAR4++ ; R1H = A1
MPYF32 R4H,R0H,R1H ; R4H = u(n-1)*A1 ,
|| ADDF32 R2H,R2H,R3H ; R2H = u(n-2)*A2+e(n)*B0+e(n-1)*B1+e(n-2)*B2+e(n-3)*B3
MOV32 R0H,*XAR4++ ; R0H = Maximum Value
ADDF32 R2H,R2H,R4H ; R2H = u(n-1)*A1+u(n-2)*A2+e(n)*B0+e(n-1)*B1+e(n-2)*B2
MOV32 R1H,*XAR4++ ; R1H = Internal minimum value
MINF32 R2H,R0H ; R2H = min (R0H{maximum value}, R2H {computed value})
MOV32 R3H,*XAR4++ ; R3H = Output minimum value
MAXF32 R2H,R1H ; R2H = Max(R2H
MOV32 *+XAR5[0],R2H ; store the internal min saturate value in the data buffer
MAXF32 R2H,R3H ; saturate result to the output min value
MOV AR0,#14
MOV32 *+XAR5[AR0],R2H ; store the result in the output terminal
;restore R4H
POP ACC
MOV32 R4H,ACC
LRETR
