Martin Simpson / Mbed 2 deprecated ELEC347_STM32F303K8_FIR

DSP Module

Dependencies:   mbed

main.cpp@0:2470e37cc502, 2017-10-13 (annotated)

Committer:
martinsimpson
Date:
Fri Oct 13 09:29:43 2017 +0000
Revision:
0:2470e37cc502
First Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
martinsimpson 0:2470e37cc502 1 #include "mbed.h"
martinsimpson 0:2470e37cc502 2
martinsimpson 0:2470e37cc502 3 //Just Comment out the Dataset you DO NOT wish to use and UN-Comment the one that you wish to use
martinsimpson 0:2470e37cc502 4 //and then 'Build' <F7> and once complete 'Load' to the STM-Discovery board <F8>
martinsimpson 0:2470e37cc502 5
martinsimpson 0:2470e37cc502 6 #include "LP_2KHz_Fc_6KHz_Fs_37N.h"
martinsimpson 0:2470e37cc502 7 //#include "LP_2KHz_Fc_40KHz_Fs_37N.h"
martinsimpson 0:2470e37cc502 8 //#include "LP_2KHz_Fc_40KHz_Fs_100N.h"
martinsimpson 0:2470e37cc502 9
martinsimpson 0:2470e37cc502 10 #define ON 1
martinsimpson 0:2470e37cc502 11 #define OFF 0
martinsimpson 0:2470e37cc502 12
martinsimpson 0:2470e37cc502 13 float x[N]={0};
martinsimpson 0:2470e37cc502 14 float yn;
martinsimpson 0:2470e37cc502 15
martinsimpson 0:2470e37cc502 16 void sampler(void); //Ticker routine PROTOTYPE
martinsimpson 0:2470e37cc502 17
martinsimpson 0:2470e37cc502 18 //MBED Class Instances follows
martinsimpson 0:2470e37cc502 19 DigitalOut SampLED(LED1); //Digital Output (GREEN LED is PB_3, D13 You can use an Oscilloscope on This pin to confirm sample rate)
martinsimpson 0:2470e37cc502 20
martinsimpson 0:2470e37cc502 21 AnalogIn Ain(PA_1); //Analog Input (Signal Input 0 to +3 Volts)
martinsimpson 0:2470e37cc502 22 AnalogOut Aout(PA_4); //Analog Output (Signal Input 0 to +3 Volts) NB PA_4 because Arduin Nano Compatability
martinsimpson 0:2470e37cc502 23 //on STM32F303k8 uses I2C PA_5 to PB7
martinsimpson 0:2470e37cc502 24
martinsimpson 0:2470e37cc502 25 Ticker sample_timer; //Ticker class instance called sample_timer
martinsimpson 0:2470e37cc502 26
martinsimpson 0:2470e37cc502 27 PwmOut test(PWM_OUT);
martinsimpson 0:2470e37cc502 28
martinsimpson 0:2470e37cc502 29
martinsimpson 0:2470e37cc502 30 int main() {
martinsimpson 0:2470e37cc502 31 float duty=0.1f;
martinsimpson 0:2470e37cc502 32 test.period_ms(1);
martinsimpson 0:2470e37cc502 33 test=duty;
martinsimpson 0:2470e37cc502 34
martinsimpson 0:2470e37cc502 35 float sample_rate=(1.0/Fs)*1000000.0; //Calculate the number of uS required for a Frequency Sampling Rate
martinsimpson 0:2470e37cc502 36 //Fs held in *.h
martinsimpson 0:2470e37cc502 37
martinsimpson 0:2470e37cc502 38 sample_timer.attach_us(&sampler,(int)sample_rate);
martinsimpson 0:2470e37cc502 39 //Ticker Instance serviced by routine at a repeat rate in microseconds
martinsimpson 0:2470e37cc502 40
martinsimpson 0:2470e37cc502 41 while(1) {
martinsimpson 0:2470e37cc502 42 sleep();
martinsimpson 0:2470e37cc502 43 }
martinsimpson 0:2470e37cc502 44 }
martinsimpson 0:2470e37cc502 45
martinsimpson 0:2470e37cc502 46 void sampler(void){ //Ticker routine
martinsimpson 0:2470e37cc502 47
martinsimpson 0:2470e37cc502 48 SampLED = ON; //LED Indicates start of sampling
martinsimpson 0:2470e37cc502 49 int i; //Initialise local variable i
martinsimpson 0:2470e37cc502 50 x[0]=Ain; //Input ADC. N.B. ADC in MBED is 0.0 to 1.0 float!!!!!!
martinsimpson 0:2470e37cc502 51 yn=0.0; //output accumulation, start as zero
martinsimpson 0:2470e37cc502 52
martinsimpson 0:2470e37cc502 53 for(i=0; i<N; i++) yn+=x[i]*b[i]; //generate output from filter components FIR a=0
martinsimpson 0:2470e37cc502 54 for(i=N-1; i!=0; i--) x[i]=x[i-1]; //shift data
martinsimpson 0:2470e37cc502 55
martinsimpson 0:2470e37cc502 56 Aout=yn; //Output resultant to DAC. Again MBED uses 0.0 to 1.0 float!!!!!!
martinsimpson 0:2470e37cc502 57
martinsimpson 0:2470e37cc502 58 SampLED = OFF; //LED Indicates end of sampling
martinsimpson 0:2470e37cc502 59 }
martinsimpson 0:2470e37cc502 60