CMST / Mbed 2 deprecated ELEC347_Coursework

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Dependencies:   mbed-rtos mbed

Fork of 2017_11_28_ELEC347_Coursework by Chris Hills

main.cpp@8:192b376a6da7, 2017-11-28 (annotated)

Committer:
chills
Date:
Tue Nov 28 15:19:08 2017 +0000
Revision:
8:192b376a6da7
Parent:
7:6cb27cce4c50
Child:
9:91c53a683856
Print Coefficients is Working Live

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mwthewsey 0:d39a06ca6bf1 1 #include "mbed.h"
mwthewsey 0:d39a06ca6bf1 2 #include "rtos.h"
mwthewsey 0:d39a06ca6bf1 3 #include "Filter.hpp"
chills 6:a2737b51424c 4
chills 6:a2737b51424c 5
mwthewsey 0:d39a06ca6bf1 6 unsigned short ADC_DATA;
mwthewsey 0:d39a06ca6bf1 7
mwthewsey 0:d39a06ca6bf1 8 //Init values for difference equation
mwthewsey 0:d39a06ca6bf1 9 //MBED Class Instances follows
mwthewsey 0:d39a06ca6bf1 10 DigitalOut SampLED(LED1); //Digital Output (GREEN LED is PB_3, D13 You can use an Oscilloscope on This pin to confirm sample rate)
mwthewsey 0:d39a06ca6bf1 11
chills 7:6cb27cce4c50 12 //Analog Inputs
chills 8:192b376a6da7 13 AnalogIn QDEF(PA_7);
chills 8:192b376a6da7 14 AnalogIn BDEF(PA_6);
chills 8:192b376a6da7 15 AnalogIn FDEF(PA_5);
mwthewsey 0:d39a06ca6bf1 16 AnalogIn Ain(PA_1); //Analog Input (Signal Input 0 to +3 Volts)
mwthewsey 0:d39a06ca6bf1 17 AnalogOut Aout(PA_4); //Analog Output (Signal Input 0 to +3 Volts)
mwthewsey 0:d39a06ca6bf1 18
chills 7:6cb27cce4c50 19 //Declare Tickers
mwthewsey 0:d39a06ca6bf1 20 Ticker sample_timer;
chills 7:6cb27cce4c50 21 Ticker coeff_change;
chills 6:a2737b51424c 22
chills 8:192b376a6da7 23 //Declare Threads
chills 8:192b376a6da7 24 Thread t1;
chills 8:192b376a6da7 25
chills 7:6cb27cce4c50 26 //Declare Ticker Rates
chills 7:6cb27cce4c50 27 float sample_rate = (1.0/35000); //Rate of sampling
chills 7:6cb27cce4c50 28 float coeff_rate = (1.0 / 20); //Rate of updating coefficients
mwthewsey 0:d39a06ca6bf1 29
chills 7:6cb27cce4c50 30 //Initial Input Value
mwthewsey 2:f6e49378dd8a 31 float input = 0.0;
chills 7:6cb27cce4c50 32
chills 7:6cb27cce4c50 33 //Declare Filter
chills 7:6cb27cce4c50 34 FILTER BP_filter(48000,10000,-16,2); //Create object of type Filter(Fs,Fo,Boost,Q)
mwthewsey 2:f6e49378dd8a 35
chills 7:6cb27cce4c50 36 //Declare Fixed Variables
chills 7:6cb27cce4c50 37 float Fo = 1;
chills 7:6cb27cce4c50 38 float Boost = 0;
chills 7:6cb27cce4c50 39 float Q = 1;
mwthewsey 0:d39a06ca6bf1 40
chills 7:6cb27cce4c50 41 //Declare Temporary Coefficient Values
chills 7:6cb27cce4c50 42 float Fo_Current;
chills 7:6cb27cce4c50 43 float Boost_Current;
chills 7:6cb27cce4c50 44 float Q_Current;
chills 7:6cb27cce4c50 45
chills 7:6cb27cce4c50 46 //Forward Declarations
mwthewsey 0:d39a06ca6bf1 47 void sampler(void);
chills 7:6cb27cce4c50 48 void coeff_update(void);
mwthewsey 0:d39a06ca6bf1 49
chills 8:192b376a6da7 50
mwthewsey 0:d39a06ca6bf1 51 int main()
mwthewsey 0:d39a06ca6bf1 52 {
chills 8:192b376a6da7 53 sample_timer.attach(&sampler,sample_rate);
chills 8:192b376a6da7 54 t1.start(coeff_update);
chills 7:6cb27cce4c50 55 printf("Hello");
mwthewsey 0:d39a06ca6bf1 56 }
mwthewsey 0:d39a06ca6bf1 57
chills 8:192b376a6da7 58
chills 7:6cb27cce4c50 59 void coeff_update(void)
chills 7:6cb27cce4c50 60 {
chills 8:192b376a6da7 61 while(1){
chills 8:192b376a6da7 62 Fo_Current = FDEF * 39999 + 1;
chills 8:192b376a6da7 63 if (abs(Fo_Current - BP_filter.Get_Fo()) > 50) //If Centre Frequency has changed significantly
chills 8:192b376a6da7 64 {
chills 8:192b376a6da7 65 BP_filter.Update_Fo(Fo_Current); //Update Centre Frequency
chills 8:192b376a6da7 66 }
chills 8:192b376a6da7 67 Boost_Current = BDEF * 100 - 50;
chills 8:192b376a6da7 68 if (abs(Boost_Current - BP_filter.Get_Boost()) > 2) //If Boost has changed significantly
chills 8:192b376a6da7 69 {
chills 8:192b376a6da7 70 BP_filter.Update_Boost(Boost_Current); //Update Boost
chills 8:192b376a6da7 71 }
chills 8:192b376a6da7 72 Q_Current = QDEF * 49 + 1;
chills 8:192b376a6da7 73 if (abs(Q_Current - BP_filter.Get_Q()) > 2) //If Q has changed significantly
chills 8:192b376a6da7 74 {
chills 8:192b376a6da7 75 BP_filter.Update_Q(Q_Current); //Update Q
chills 8:192b376a6da7 76 }
chills 8:192b376a6da7 77 BP_filter.Define_Filter(); //Calculate the coefficients
chills 8:192b376a6da7 78 BP_filter.Print_Filter(); //Print the ceofficients
chills 7:6cb27cce4c50 79 }
chills 7:6cb27cce4c50 80 }
mwthewsey 0:d39a06ca6bf1 81
mwthewsey 0:d39a06ca6bf1 82 void sampler(void)
mwthewsey 0:d39a06ca6bf1 83 {
mwthewsey 0:d39a06ca6bf1 84 SampLED = 1; //LED Indicates start of sampling
mwthewsey 0:d39a06ca6bf1 85
mwthewsey 2:f6e49378dd8a 86 input = Ain;
chills 7:6cb27cce4c50 87 BP_filter.setvalue(input); //Input ADC. N.B. ADC in MBED is 0.0 to 1.0 float!!!!!!
mwthewsey 0:d39a06ca6bf1 88 Aout = BP_filter.getvalue();
mwthewsey 0:d39a06ca6bf1 89
mwthewsey 0:d39a06ca6bf1 90
mwthewsey 0:d39a06ca6bf1 91 SampLED = 0; //LED Indicates end of sampling
chills 7:6cb27cce4c50 92 }