不韋 呂 / Mbed 2 deprecated UIT2_IIR_1stOrder

IIR filter of 1st order for ST Nucleo F401RE.

Dependencies:   UIT_ADDA mbed

main.cpp@3:b17e5d790a55, 2014-11-15 (annotated)

Committer:
MikamiUitOpen
Date:
Sat Nov 15 06:17:50 2014 +0000
Revision:
3:b17e5d790a55
Parent:
2:ed56284ebeb7 
4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:22eafb1b3124 1 //--------------------------------------------------------------
MikamiUitOpen 0:22eafb1b3124 2 // １次の IIR フィルタ
MikamiUitOpen 0:22eafb1b3124 3 // Analog Input : A0
MikamiUitOpen 0:22eafb1b3124 4 // Analog Output: MCP4922 using SPI
MikamiUitOpen 2:ed56284ebeb7 5 // 2014/11/12, Copyright (c) 2014 MIKAMI, Naoki
MikamiUitOpen 0:22eafb1b3124 6 //--------------------------------------------------------------
MikamiUitOpen 0:22eafb1b3124 7
MikamiUitOpen 0:22eafb1b3124 8 #include "mbed.h"
MikamiUitOpen 0:22eafb1b3124 9
MikamiUitOpen 0:22eafb1b3124 10 #include "ADC_Base.hpp" // for ADC not using interrupt
MikamiUitOpen 0:22eafb1b3124 11 #include "DAC_MCP4922.hpp" // for DAC MCP4922
MikamiUitOpen 0:22eafb1b3124 12
MikamiUitOpen 0:22eafb1b3124 13 using namespace Mikami;
MikamiUitOpen 0:22eafb1b3124 14
MikamiUitOpen 0:22eafb1b3124 15 const int FS_ = 12000; // Sampling frequency: 12 kHz
MikamiUitOpen 0:22eafb1b3124 16 ADC_Base adc_(A0, FS_); // for AD
MikamiUitOpen 0:22eafb1b3124 17 DAC_MCP4922 myDac_; // for DA
MikamiUitOpen 0:22eafb1b3124 18
MikamiUitOpen 0:22eafb1b3124 19 int main()
MikamiUitOpen 0:22eafb1b3124 20 {
MikamiUitOpen 2:ed56284ebeb7 21 myDac_.ScfClockTim3(500000); // cutoff frequency: 5 kHz
MikamiUitOpen 0:22eafb1b3124 22
MikamiUitOpen 0:22eafb1b3124 23 const float A1 = 0.8f;
MikamiUitOpen 0:22eafb1b3124 24 const float B0 = 1.0f - A1;
MikamiUitOpen 0:22eafb1b3124 25 float yn = 0;
MikamiUitOpen 0:22eafb1b3124 26
MikamiUitOpen 0:22eafb1b3124 27 while (true)
MikamiUitOpen 0:22eafb1b3124 28 {
MikamiUitOpen 0:22eafb1b3124 29 float xn = adc_.Read(); // Read from A0
MikamiUitOpen 0:22eafb1b3124 30 //-----------------------------------------------
MikamiUitOpen 0:22eafb1b3124 31
MikamiUitOpen 0:22eafb1b3124 32 yn = A1*yn + B0*xn;
MikamiUitOpen 0:22eafb1b3124 33
MikamiUitOpen 0:22eafb1b3124 34 //-----------------------------------------------
MikamiUitOpen 0:22eafb1b3124 35 myDac_.Write(yn); // Write to DAC
MikamiUitOpen 0:22eafb1b3124 36 }
MikamiUitOpen 0:22eafb1b3124 37 }