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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@0:b26f86125165, 2014-10-30 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Thu Oct 30 00:38:14 2014 +0000
- Revision:
- 0:b26f86125165
- Child:
- 2:a19243a20882
0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 0:b26f86125165 | 1 | //-------------------------------------------------------------- |
MikamiUitOpen | 0:b26f86125165 | 2 | // 移動平均, 平均数:1, 2, 4, 8, 16, 32, 64:スイッチで選択 |
MikamiUitOpen | 0:b26f86125165 | 3 | // スイッチの状態を printf() で表示する |
MikamiUitOpen | 0:b26f86125165 | 4 | // Analog Input : A0 |
MikamiUitOpen | 0:b26f86125165 | 5 | // Analog Output: MCP4922 using SPI |
MikamiUitOpen | 0:b26f86125165 | 6 | // 2014/10/30, Copyright (c) 2014 MIKAMI, Naoki |
MikamiUitOpen | 0:b26f86125165 | 7 | //-------------------------------------------------------------- |
MikamiUitOpen | 0:b26f86125165 | 8 | |
MikamiUitOpen | 0:b26f86125165 | 9 | #include "mbed.h" |
MikamiUitOpen | 0:b26f86125165 | 10 | |
MikamiUitOpen | 0:b26f86125165 | 11 | #include "ADC_Interrupt.hpp" // for ADC using interrupt |
MikamiUitOpen | 0:b26f86125165 | 12 | #include "DAC_MCP4922.hpp" // for DAC MCP4922 |
MikamiUitOpen | 0:b26f86125165 | 13 | #include "ScfClockTim3.hpp" // for clock supplied to SCF |
MikamiUitOpen | 0:b26f86125165 | 14 | |
MikamiUitOpen | 0:b26f86125165 | 15 | using namespace Mikami; |
MikamiUitOpen | 0:b26f86125165 | 16 | |
MikamiUitOpen | 0:b26f86125165 | 17 | const int FS_ = 12000; // Sampling frequency: 12 kHz |
MikamiUitOpen | 0:b26f86125165 | 18 | ADC_Intr adc_(A0, FS_); // for AD using interrupt |
MikamiUitOpen | 0:b26f86125165 | 19 | DAC_MCP4922 myDac_; // for DA |
MikamiUitOpen | 0:b26f86125165 | 20 | |
MikamiUitOpen | 0:b26f86125165 | 21 | DigitalIn sw1_(D2, PullDown); |
MikamiUitOpen | 0:b26f86125165 | 22 | DigitalIn sw2_(D3, PullDown); |
MikamiUitOpen | 0:b26f86125165 | 23 | DigitalIn sw4_(D4, PullDown); |
MikamiUitOpen | 0:b26f86125165 | 24 | DigitalIn sw8_(D5, PullDown); |
MikamiUitOpen | 0:b26f86125165 | 25 | |
MikamiUitOpen | 0:b26f86125165 | 26 | const int M_ = 64; // Maximum of average count |
MikamiUitOpen | 0:b26f86125165 | 27 | float xn_[M_]; |
MikamiUitOpen | 0:b26f86125165 | 28 | volatile int nAv_; // "volatile": to make sure |
MikamiUitOpen | 0:b26f86125165 | 29 | |
MikamiUitOpen | 0:b26f86125165 | 30 | // Interrupt service routine for ADC |
MikamiUitOpen | 0:b26f86125165 | 31 | void AdcIsr() |
MikamiUitOpen | 0:b26f86125165 | 32 | { |
MikamiUitOpen | 0:b26f86125165 | 33 | xn_[0] = adc_.Read(); // Read from A0 |
MikamiUitOpen | 0:b26f86125165 | 34 | //----------------------------------------------- |
MikamiUitOpen | 0:b26f86125165 | 35 | |
MikamiUitOpen | 0:b26f86125165 | 36 | float yn = 0; |
MikamiUitOpen | 0:b26f86125165 | 37 | for (int k=0; k<nAv_; k++) yn = yn + xn_[k]; |
MikamiUitOpen | 0:b26f86125165 | 38 | yn = yn/(float)nAv_; // yn: average |
MikamiUitOpen | 0:b26f86125165 | 39 | |
MikamiUitOpen | 0:b26f86125165 | 40 | // Update input buffer |
MikamiUitOpen | 0:b26f86125165 | 41 | for (int k = nAv_-1; k>0; k--) |
MikamiUitOpen | 0:b26f86125165 | 42 | xn_[k] = xn_[k-1]; |
MikamiUitOpen | 0:b26f86125165 | 43 | |
MikamiUitOpen | 0:b26f86125165 | 44 | //----------------------------------------------- |
MikamiUitOpen | 0:b26f86125165 | 45 | myDac_.Write(yn); // Write to DAC |
MikamiUitOpen | 0:b26f86125165 | 46 | } |
MikamiUitOpen | 0:b26f86125165 | 47 | |
MikamiUitOpen | 0:b26f86125165 | 48 | int main() |
MikamiUitOpen | 0:b26f86125165 | 49 | { |
MikamiUitOpen | 0:b26f86125165 | 50 | ScfClockTim3(500000); // cutoff frequency: 5 kHz |
MikamiUitOpen | 0:b26f86125165 | 51 | adc_.SetIntrVec(AdcIsr); // Assign ISR for ADC interrupt |
MikamiUitOpen | 0:b26f86125165 | 52 | |
MikamiUitOpen | 0:b26f86125165 | 53 | for (int n=0; n<M_; n++) xn_[n] = 0; |
MikamiUitOpen | 0:b26f86125165 | 54 | |
MikamiUitOpen | 0:b26f86125165 | 55 | while (true) |
MikamiUitOpen | 0:b26f86125165 | 56 | { |
MikamiUitOpen | 0:b26f86125165 | 57 | int sw = (sw8_ << 3) | (sw4_ << 2) | (sw2_ << 1) | sw1_; |
MikamiUitOpen | 0:b26f86125165 | 58 | nAv_ = 1 << sw; |
MikamiUitOpen | 0:b26f86125165 | 59 | if (nAv_ > 64) nAv_ = 64; |
MikamiUitOpen | 0:b26f86125165 | 60 | printf("\r\nnAv = %d, sw = %d", nAv_, sw); |
MikamiUitOpen | 0:b26f86125165 | 61 | |
MikamiUitOpen | 0:b26f86125165 | 62 | wait(0.5f); |
MikamiUitOpen | 0:b26f86125165 | 63 | } |
MikamiUitOpen | 0:b26f86125165 | 64 | } |