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@5:98ec9dd54144, 2015-12-15 (annotated)

Committer:
MikamiUitOpen
Date:
Tue Dec 15 13:27:07 2015 +0000
Revision:
5:98ec9dd54144
Parent:
2:095b360e0f54
Child:
6:b27ef8d98edc
6

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 2:095b360e0f54 1 //-----------------------------------------------------------
MikamiUitOpen 2:095b360e0f54 2 // Class for sampling input signal
MikamiUitOpen 2:095b360e0f54 3 //
MikamiUitOpen 5:98ec9dd54144 4 // 2015/12/15, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 2:095b360e0f54 5 //-----------------------------------------------------------
MikamiUitOpen 2:095b360e0f54 6
MikamiUitOpen 2:095b360e0f54 7 #include "Sampler.hpp"
MikamiUitOpen 2:095b360e0f54 8
MikamiUitOpen 2:095b360e0f54 9 namespace Mikami
MikamiUitOpen 2:095b360e0f54 10 {
MikamiUitOpen 2:095b360e0f54 11 Sampler::Sampler(PinName pin, int fs, int nData)
MikamiUitOpen 2:095b360e0f54 12 : TS_(1000000/fs), N_DATA_(nData), aIn_(pin),
MikamiUitOpen 2:095b360e0f54 13 buffer_(new int16_t[nData])
MikamiUitOpen 2:095b360e0f54 14 {
MikamiUitOpen 2:095b360e0f54 15 Set(false);
MikamiUitOpen 2:095b360e0f54 16 Rd[0] = &Sampler::ReadNorm; // inphase
MikamiUitOpen 2:095b360e0f54 17 Rd[1] = &Sampler::ReadInv; // out-of-phase
MikamiUitOpen 2:095b360e0f54 18 sw_ = 0;
MikamiUitOpen 5:98ec9dd54144 19 for (int n=0; n<nData; n++)
MikamiUitOpen 5:98ec9dd54144 20 buffer_[n] = 32767;
MikamiUitOpen 2:095b360e0f54 21 }
MikamiUitOpen 2:095b360e0f54 22
MikamiUitOpen 2:095b360e0f54 23 void Sampler::IntrEnable()
MikamiUitOpen 2:095b360e0f54 24 {
MikamiUitOpen 2:095b360e0f54 25 count_ = 0;
MikamiUitOpen 2:095b360e0f54 26 timer_.attach_us(this, &Sampler::Isr, TS_);
MikamiUitOpen 2:095b360e0f54 27 }
MikamiUitOpen 2:095b360e0f54 28
MikamiUitOpen 2:095b360e0f54 29 void Sampler::Set(bool tf)
MikamiUitOpen 2:095b360e0f54 30 {
MikamiUitOpen 2:095b360e0f54 31 timer_.detach();
MikamiUitOpen 2:095b360e0f54 32 trigger_ = false;
MikamiUitOpen 2:095b360e0f54 33 xnM1_ = 32767;
MikamiUitOpen 2:095b360e0f54 34 filled_ = tf;
MikamiUitOpen 2:095b360e0f54 35 }
MikamiUitOpen 2:095b360e0f54 36
MikamiUitOpen 2:095b360e0f54 37 // Interrupt service routine for Ticker
MikamiUitOpen 2:095b360e0f54 38 void Sampler::Isr()
MikamiUitOpen 2:095b360e0f54 39 {
MikamiUitOpen 2:095b360e0f54 40 if (!trigger_)
MikamiUitOpen 2:095b360e0f54 41 {
MikamiUitOpen 2:095b360e0f54 42 int16_t xn = (this->*Rd[sw_])();
MikamiUitOpen 2:095b360e0f54 43 // Detect rising edge
MikamiUitOpen 2:095b360e0f54 44 if ((xn > (xnM1_+512)) && (xn > 2048))
MikamiUitOpen 2:095b360e0f54 45 trigger_ = true;
MikamiUitOpen 2:095b360e0f54 46 else
MikamiUitOpen 2:095b360e0f54 47 xnM1_ = xn;
MikamiUitOpen 2:095b360e0f54 48 return;
MikamiUitOpen 2:095b360e0f54 49 }
MikamiUitOpen 2:095b360e0f54 50
MikamiUitOpen 2:095b360e0f54 51 buffer_[count_] = (this->*Rd[sw_])(); // Read from A0
MikamiUitOpen 2:095b360e0f54 52
MikamiUitOpen 2:095b360e0f54 53 if (++count_ >= N_DATA_)
MikamiUitOpen 2:095b360e0f54 54 Set(true); // Permits spectrum analysis
MikamiUitOpen 2:095b360e0f54 55 }
MikamiUitOpen 2:095b360e0f54 56 }