不韋 呂 / Mbed 2 deprecated F746_RealtimeSpectrumAnalyzer

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Dependencies:   BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed

MyClasses/Sampler.cpp

Committer:
MikamiUitOpen
Date:
2015-12-18
Revision:
6:b27ef8d98edc
Parent:
5:98ec9dd54144
Child:
7:6598a9b70e5a

File content as of revision 6:b27ef8d98edc:

//-----------------------------------------------------------
//  Class for sampling input signal
//
//  2015/12/18, Copyright (c) 2015 MIKAMI, Naoki
//-----------------------------------------------------------

#include "Sampler.hpp"

namespace Mikami
{
    Sampler::Sampler(PinName pin, int fs, int nData,
                     int16_t* const buffer)
        : TS_(1000000/fs), N_DATA_(nData), aIn_(pin),
          buffer_(buffer)
    {   
        Set(false); 
        Rd[0] = &Sampler::ReadNorm; // inphase
        Rd[1] = &Sampler::ReadInv;  // out-of-phase
        sw_ = 0;
        for (int n=0; n<nData; n++)
            buffer_[n] = 32767;
    }

    void Sampler::IntrEnable()
    {
        count_ = 0;
        timer_.attach_us(this, &Sampler::Isr, TS_);
    }

    void Sampler::Set(bool tf)
    {
        timer_.detach();
        trigger_ = false;
        xnM1_ = 32767;
        filled_ = tf;
    }

    // Interrupt service routine for Ticker
    void Sampler::Isr()
    {
        if (!trigger_)
        {
            int16_t xn = (this->*Rd[sw_])();
            // Detect rising edge
            if ((xn > (xnM1_+512)) && (xn > 2048))
                trigger_ = true;
            else
                xnM1_ = xn;
            return;
        }

        buffer_[count_] = (this->*Rd[sw_])();   // Read from A0

        if (++count_ >= N_DATA_)
            Set(true);  // Permits spectrum analysis            
    }
}