Revision 0:a994e937bae1, committed 2018-11-09
- Comitter:
- Swabey89
- Date:
- Fri Nov 09 19:18:13 2018 +0000
- Commit message:
- Initial
Changed in this revision
diff -r 000000000000 -r a994e937bae1 filter_characteristics.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/filter_characteristics.h Fri Nov 09 19:18:13 2018 +0000
@@ -0,0 +1,42 @@
+#define Fs 6000
+#define N 37
+
+float b[N]={
+-0.000000,
+-0.000684,
+0.001238,
+-0.000000,
+-0.003098,
+0.004522,
+-0.000000,
+-0.008736,
+0.011729,
+-0.000000,
+-0.020268,
+0.026356,
+-0.000000,
+-0.045082,
+0.060638,
+-0.000000,
+-0.133528,
+0.273491,
+0.666667,
+0.273491,
+-0.133528,
+-0.000000,
+0.060638,
+-0.045082,
+-0.000000,
+0.026356,
+-0.020268,
+-0.000000,
+0.011729,
+-0.008736,
+-0.000000,
+0.004522,
+-0.003098,
+-0.000000,
+0.001238,
+-0.000684,
+-0.000000
+};
diff -r 000000000000 -r a994e937bae1 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Nov 09 19:18:13 2018 +0000
@@ -0,0 +1,62 @@
+#include "mbed.h"
+
+//Add more to test different setups
+#include "filter_characteristics.h"
+
+
+#define ON 1
+#define OFF 0
+
+float x[N]={0};
+float yn;
+Timer t;
+
+void sampler(void); //Ticker routine PROTOTYPE
+
+//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)
+DigitalOut testpin(PA_10);
+
+AnalogIn Ain(PA_1); //Analog Input (Signal Input 0 to +3 Volts)
+AnalogOut Aout(PA_4); //Analog Output (Signal Input 0 to +3 Volts) NB PA_4 because Arduin Nano Compatability
+ //on STM32F303k8 uses I2C PA_5 to PB7
+
+Ticker sample_timer; //Ticker class instance called sample_timer
+
+PwmOut test(PWM_OUT);
+
+
+int main() {
+ float duty=0.1f;
+ test.period_ms(1);
+ test=duty;
+
+ float sample_rate=(1.0/Fs)*1000000.0; //Calculate the number of uS required for a Frequency Sampling Rate
+ //Fs held in *.h
+
+ sample_timer.attach_us(&sampler,(int)sample_rate);
+ //Ticker Instance serviced by routine at a repeat rate in microseconds
+
+ while(1) {
+ sleep();
+ }
+}
+
+void sampler(void){ //Ticker routine
+ SampLED = ON; //LED Indicates start of sampling
+ int i; //Initialise local variable i
+ testpin = 1;
+ x[0]=Ain; //Input ADC. N.B. ADC in MBED is 0.0 to 1.0 float!!!!!!
+ yn=0.0; //output accumulation, start as zero
+
+
+ for(i=0; i<N; i++) yn+=x[i]*b[i]; //generate output from filter components FIR a=0
+ for(i=N-1; i!=0; i--) x[i]=x[i-1]; //shift data
+
+ Aout=yn; //Output resultant to DAC. Again MBED uses 0.0 to 1.0 float!!!!!!
+
+ testpin = 0;
+
+ SampLED = OFF; //LED Indicates end of sampling
+ }
+
diff -r 000000000000 -r a994e937bae1 mbed.bld
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld Fri Nov 09 19:18:13 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/e95d10626187
\ No newline at end of file
Mathew Swabey
