V001. 2017_11_30 10:21 Working code from Tuesday's lab session.
Fork of 2017_11_28_ELEC347_Coursework by
DSP Coursework ELEC347 2017-2018 Group members: Matthew Thewsey, Thomas Morris, Samuel Waggett, Christopher Hills .
main.cpp
- Committer:
- thomasmorris
- Date:
- 2017-12-04
- Revision:
- 13:db76473a3d76
- Parent:
- 12:d522a7a061d6
- Child:
- 14:379796f5868e
- Child:
- 16:c91b29c9e9f6
File content as of revision 13:db76473a3d76:
#include "mbed.h" #include "rtos.h" #include "Filter.hpp" unsigned short ADC_DATA; //Init values for difference equation //MBED Class Instances follows DigitalOut SampLED(LED1); //Digital Output (GREEN LED is PB_3, D13 You can use an Oscilloscope on This pin to confirm sample rate) //Analog Inputs AnalogIn Ain(PA_1); //Analog Input (Signal Input 0 to +3 Volts) AnalogOut Aout(PA_4); //Analog Output (Signal Input 0 to +3 Volts) //Declare Threads Thread t1; Thread t2; AnalogIn QDEF(PA_7); // Q Factor AnalogIn BDEF(PA_6); // Boost Level AnalogIn FDEF(PA_5); //Centre Frequency //Declare Ticker Rates float sample_rate = (1.0/35000); //Rate of sampling float coeff_rate = (1.0 / 20); //Rate of updating coefficients //Initial Input Value float input = 0.0; float Fo_Current; float Boost_Current; float Q_Current; //Declare Filter FILTER BP_filter(48000,10000,-16,2); //Create object of type Filter(Fs,Fo,Boost,Q) //Forward Declarations void sampler(void); void update(void); int main() { t2.start(sampler);//Start the Sampler timed interrupt t1.start(update);//Update the coeffiecients of the filter } void update(void) { while(1){ Fo_Current = FDEF * 22000 + 10; Boost_Current = BDEF * 100 - 50; Q_Current = QDEF * 49 + 1; BP_filter.coeff_update(Fo_Current,Boost_Current,Q_Current);//Coefficient update printf("Q = %d \t Boost = %f \t Fo = %d\n\r", BP_filter.Get_Q(), BP_filter.Get_Boost(), BP_filter.Get_Fo()); Thread::wait(1000);//Sleep the thread for 1 second then re runs the coefficient calculation } } void sampler(void) { while(1) { SampLED = 1;//LED Indicates start of sampling input = Ain;//Takes ADC input as a Varaible type float BP_filter.setvalue(input);//Input ADC. N.B. ADC in MBED is 0.0 to 1.0 float!!!!!! Aout = BP_filter.getvalue();//Sets the input value to the Class SampLED = 0;//LED Indicates end of sampling Thread::wait(sample_rate*1000);//Look at this } }