不韋 呂 / Mbed 2 deprecated UIT2_FIR_LPF_Direct

FIR filter of Direct form for ST Nucleo F401RE.

Dependencies:   UITDSP_ADDA mbed

main.cpp@8:927d97f834b0, 2015-09-04 (annotated)

Committer:
MikamiUitOpen
Date:
Fri Sep 04 09:09:05 2015 +0000
Revision:
8:927d97f834b0
Parent:
6:5a7e4d3d786a 
9

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:bbbc6e10e439 1 //--------------------------------------------------------------
MikamiUitOpen 0:bbbc6e10e439 2 // FIR フィルタ，基本的な構造
MikamiUitOpen 0:bbbc6e10e439 3 // Analog Input : A0
MikamiUitOpen 0:bbbc6e10e439 4 // Analog Output: MCP4922 using SPI
MikamiUitOpen 8:927d97f834b0 5 // 2015/07/03, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:bbbc6e10e439 6 //--------------------------------------------------------------
MikamiUitOpen 0:bbbc6e10e439 7
MikamiUitOpen 8:927d97f834b0 8 #include "ADC_BuiltIn.hpp" // for ADC not using interrupt
MikamiUitOpen 8:927d97f834b0 9 #include "DAC_MCP4921.hpp" // for DAC MCP4921, MCP4922
MikamiUitOpen 0:bbbc6e10e439 10 #include "Coefficients_200_LPF.hpp"
MikamiUitOpen 0:bbbc6e10e439 11
MikamiUitOpen 0:bbbc6e10e439 12 using namespace Mikami;
MikamiUitOpen 0:bbbc6e10e439 13
MikamiUitOpen 8:927d97f834b0 14 const int FS_ = 12000; // Sampling frequency: 12 kHz
MikamiUitOpen 8:927d97f834b0 15 ADC_BuiltIn adc_(A0, FS_); // for AD
MikamiUitOpen 8:927d97f834b0 16 DAC_MCP4921 myDac_; // for DA
MikamiUitOpen 0:bbbc6e10e439 17
MikamiUitOpen 0:bbbc6e10e439 18 int main()
MikamiUitOpen 0:bbbc6e10e439 19 {
MikamiUitOpen 6:5a7e4d3d786a 20 myDac_.ScfClockTim3(500000); // cutoff frequency: 5 kHz
MikamiUitOpen 0:bbbc6e10e439 21
MikamiUitOpen 0:bbbc6e10e439 22 float xn[ORDER_+1];
MikamiUitOpen 0:bbbc6e10e439 23 for (int n=0; n<=ORDER_; n++)
MikamiUitOpen 0:bbbc6e10e439 24 xn[n] = 0;
MikamiUitOpen 0:bbbc6e10e439 25
MikamiUitOpen 0:bbbc6e10e439 26 while (true)
MikamiUitOpen 0:bbbc6e10e439 27 {
MikamiUitOpen 6:5a7e4d3d786a 28 xn[0] = adc_.Read(); // Read from A0
MikamiUitOpen 0:bbbc6e10e439 29 //-----------------------------------------------
MikamiUitOpen 0:bbbc6e10e439 30
MikamiUitOpen 0:bbbc6e10e439 31 float yn = 0;
MikamiUitOpen 0:bbbc6e10e439 32 for (int k=0; k<=ORDER_; k++)
MikamiUitOpen 0:bbbc6e10e439 33 yn = yn + hm_[k]*xn[k];
MikamiUitOpen 0:bbbc6e10e439 34
MikamiUitOpen 0:bbbc6e10e439 35 for (int k=ORDER_; k>0; k--)
MikamiUitOpen 6:5a7e4d3d786a 36 xn[k] = xn[k-1]; // move input signals
MikamiUitOpen 0:bbbc6e10e439 37
MikamiUitOpen 0:bbbc6e10e439 38 //-----------------------------------------------
MikamiUitOpen 6:5a7e4d3d786a 39 myDac_.Write(yn); // Write to DAC
MikamiUitOpen 0:bbbc6e10e439 40 }
MikamiUitOpen 0:bbbc6e10e439 41 }