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Moving average for ST Nucleo F401RE. The number of average is controled by sw.
main.cpp
- Committer:
- MikamiUitOpen
- Date:
- 2014-10-29
- Revision:
- 2:bf617231c9bd
- Parent:
- 1:2b1ce47a1fd7
- Child:
- 4:5a068d9ef168
File content as of revision 2:bf617231c9bd:
//-------------------------------------------------------------- // 移動平均, 平均数:1, 2, 4, 8, 16, 32, 64:スイッチで選択 // Analog Input : A0 // Analog Output: MCP4922 using SPI // 2014/10/29, Copyright (c) 2014 MIKAMI, Naoki //-------------------------------------------------------------- #include "mbed.h" #include "ADC_Base.hpp" // for ADC not using interrupt #include "DAC_MCP4922.hpp" // for DAC MCP4922 #include "ScfClockTim3.hpp" // for clock supplied to SCF using namespace Mikami; const int FS_ = 12000; // Sampling frequency: 12 kHz ADC_Base adc_(A0, FS_); // for AD DAC_MCP4922 myDac_; // for DA DigitalIn sw1_(D2, PullDown); DigitalIn sw2_(D3, PullDown); DigitalIn sw4_(D4, PullDown); DigitalIn sw8_(D5, PullDown); int main() { ScfClockTim3(500000); // cutoff frequency: 5 kHz const int M = 64; float xn[M]; for (int n=0; n<M; n++) xn[n] = 0; while (true) { int sw = (sw8_ << 3) | (sw4_ << 2) | (sw2_ << 1) | sw1_; int nAv = 1 << sw; if (nAv > 64) nAv = 64; xn[0] = adc_.Read(); // Read from A0 //----------------------------------------------- float yn = 0; for (int k=0; k<nAv; k++) yn = yn + xn[k]; yn = yn/(float)nAv; // yn: average // Update input buffer for (int k = nAv-1; k>0; k--) xn[k] = xn[k-1]; //----------------------------------------------- myDac_.Write(yn); // Write to DAC } }