不韋 呂 / F446_AD_DA_MultirateSWI

Nucleo-F446RE 内蔵の AD/DA を使うためのライブラリ．DA からの出力は，標本化周波数の４倍のレートで行う．AD の読み込みにはソフトウェア割り込みを使用． 　このライブラリを登録した際のプログラム： Demo_F446_AD_DA_MultirateSWI. Library for built-in ADC and DAC in Nucleo-F446RE using software interrupt for reading ADC. Sampling rate for DAC is four times of that for ADC.

Dependencies:   Array_Matrix

Dependents:   F446_UpSampling_LPF_HPF_Variable Demo_F446_AD_DA_MultirateSWI

IIR_Cascade.hpp@2:c8aa7ae0012c, 2020-02-09 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Feb 09 02:18:32 2020 +0000
Revision:
2:c8aa7ae0012c
Parent:
0:3e5b7187753d 
3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:3e5b7187753d 1 //---------------------------------------------------
MikamiUitOpen 0:3e5b7187753d 2 // 縦続形 IIR フィルタ
MikamiUitOpen 0:3e5b7187753d 3 //
MikamiUitOpen 0:3e5b7187753d 4 // 2018/10/11, Copyright (c) 2018 MIKAMI, Naoki
MikamiUitOpen 0:3e5b7187753d 5 //---------------------------------------------------
MikamiUitOpen 0:3e5b7187753d 6
MikamiUitOpen 0:3e5b7187753d 7 #ifndef IIR_CASCADE_HPP
MikamiUitOpen 0:3e5b7187753d 8 #define IIR_CASCADE_HPP
MikamiUitOpen 0:3e5b7187753d 9
MikamiUitOpen 0:3e5b7187753d 10 #include "Biquad.hpp"
MikamiUitOpen 0:3e5b7187753d 11 #include "Array.hpp" // Array クラスが定義されている
MikamiUitOpen 0:3e5b7187753d 12
MikamiUitOpen 0:3e5b7187753d 13 namespace Mikami
MikamiUitOpen 0:3e5b7187753d 14 {
MikamiUitOpen 0:3e5b7187753d 15 class IirCascade
MikamiUitOpen 0:3e5b7187753d 16 {
MikamiUitOpen 0:3e5b7187753d 17 public:
MikamiUitOpen 0:3e5b7187753d 18 // コンストラクタ
MikamiUitOpen 0:3e5b7187753d 19 IirCascade(int order = 0, const Biquad hk[] = NULL, float g0 = 1)
MikamiUitOpen 0:3e5b7187753d 20 : order_(order), hn_((order+1)/2, hk), g0_(g0) {}
MikamiUitOpen 0:3e5b7187753d 21
MikamiUitOpen 0:3e5b7187753d 22 // フィルタ処理を実行する
MikamiUitOpen 0:3e5b7187753d 23 float Execute(float xn)
MikamiUitOpen 0:3e5b7187753d 24 {
MikamiUitOpen 0:3e5b7187753d 25 float yn = g0_*xn;
MikamiUitOpen 0:3e5b7187753d 26 for (int k=0; k<(order_+1)/2; k++) yn = hn_[k].Execute(yn);
MikamiUitOpen 0:3e5b7187753d 27 return yn;
MikamiUitOpen 0:3e5b7187753d 28 }
MikamiUitOpen 0:3e5b7187753d 29
MikamiUitOpen 0:3e5b7187753d 30 // 係数の設定
MikamiUitOpen 0:3e5b7187753d 31 void SetCoefs(int order, const Biquad::Coefs ck[], float g0)
MikamiUitOpen 0:3e5b7187753d 32 {
MikamiUitOpen 0:3e5b7187753d 33 if (order_ != order)
MikamiUitOpen 0:3e5b7187753d 34 {
MikamiUitOpen 0:3e5b7187753d 35 order_ = order;
MikamiUitOpen 0:3e5b7187753d 36 hn_.SetSize((order+1)/2);
MikamiUitOpen 0:3e5b7187753d 37 }
MikamiUitOpen 0:3e5b7187753d 38 g0_ = g0;
MikamiUitOpen 0:3e5b7187753d 39 for (int k=0; k<(order+1)/2; k++) hn_[k].SetCoefs(ck[k]);
MikamiUitOpen 0:3e5b7187753d 40 }
MikamiUitOpen 0:3e5b7187753d 41
MikamiUitOpen 0:3e5b7187753d 42 // 内部変数（遅延器）のクリア
MikamiUitOpen 0:3e5b7187753d 43 void Clear()
MikamiUitOpen 0:3e5b7187753d 44 { for (int k=0; k<(order_+1)/2; k++) hn_[k].Clear(); }
MikamiUitOpen 0:3e5b7187753d 45
MikamiUitOpen 0:3e5b7187753d 46 private:
MikamiUitOpen 0:3e5b7187753d 47 int order_; // 次数
MikamiUitOpen 0:3e5b7187753d 48 Array<Biquad> hn_; // Biquad クラスのオブジェクトの配列
MikamiUitOpen 0:3e5b7187753d 49 float g0_; // 利得定数
MikamiUitOpen 0:3e5b7187753d 50 };
MikamiUitOpen 0:3e5b7187753d 51 }
MikamiUitOpen 0:3e5b7187753d 52 #endif // IIR_CASCADE_HPP