不韋 呂
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UIT2_MovingAverage
Moving average for ST Nucleo F401RE. The number of average is controled by sw.
Diff: main.cpp
- Revision:
- 0:2e17a28353a0
- Child:
- 1:2b1ce47a1fd7
diff -r 000000000000 -r 2e17a28353a0 main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Oct 29 13:16:24 2014 +0000 @@ -0,0 +1,54 @@ +//-------------------------------------------------------------- +// 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 = (sw4_ << 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 + } +}