不韋 呂 / Mbed 2 deprecated UIT2_MovingAv_Intr

Moving average using interrupt for ST Nucleo F401RE. The number of average is controled by sw. This program displays the number of average on LCD device connected by I2C.

Dependencies:   UITDSP_ADDA mbed UIT_ACM1602NI UIT_AQM1602

main.cpp

Committer:
MikamiUitOpen
Date:
2014-11-12
Revision:
2:a19243a20882
Parent:
0:b26f86125165
Child:
4:7635c95836a0

File content as of revision 2:a19243a20882:

//--------------------------------------------------------------
// 移動平均, 平均数：1, 2, 4, 8, 16, 32, 64：スイッチで選択
// スイッチの状態を printf() で表示する
//      Analog Input : A0
//      Analog Output: MCP4922 using SPI
// 2014/11/12, Copyright (c) 2014 MIKAMI, Naoki
//--------------------------------------------------------------

#include "mbed.h"

#include "ADC_Interrupt.hpp"    // for ADC using interrupt
#include "DAC_MCP4922.hpp"      // for DAC MCP4922

using namespace Mikami;

const int FS_ = 12000;  // Sampling frequency: 12 kHz
ADC_Intr adc_(A0, FS_); // for AD using interrupt
DAC_MCP4922 myDac_;     // for DA

DigitalIn sw1_(D2, PullDown);
DigitalIn sw2_(D3, PullDown);
DigitalIn sw4_(D4, PullDown);
DigitalIn sw8_(D5, PullDown);

const int M_ = 64;  // Maximum of average count
float xn_[M_];
volatile int nAv_;  // "volatile": to make sure

// Interrupt service routine for ADC
void AdcIsr()
{   
    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
}

int main()
{
    myDac_.ScfClockTim3(500000);    // cutoff frequency: 5 kHz
    adc_.SetIntrVec(AdcIsr);    // Assign ISR for ADC interrupt

    for (int n=0; n<M_; n++) xn_[n] = 0;
    
    while (true)
    {
        int sw = (sw8_ << 3) | (sw4_ << 2) | (sw2_ << 1) | sw1_;
        nAv_ = 1 << sw;
        if (nAv_ > 64) nAv_ = 64;       
        printf("\r\nnAv = %d, sw = %d", nAv_, sw);

        wait(0.5f);
    }
}