Revision 26:b93c82fb6e1d, committed 2014-10-17

Comitter:

s1340735

Date:

Fri Oct 17 08:32:39 2014 +0000

Parent:

25:cfd6db9b4b5d

Child:

27:24e73fd36859

Commit message:

filter coefficienten;

Changed in this revision

--- a/EMGfilter.cpp	Wed Oct 15 13:43:20 2014 +0000
+++ b/EMGfilter.cpp	Fri Oct 17 08:32:39 2014 +0000
@@ -11,19 +11,19 @@
 
 MODSERIAL pc(USBTX,USBRX);
 
-HIDScope scope(2);//WHAT IS THIS
+HIDScope scope(4);//uitgang scherm
 
 arm_biquad_casd_df1_inst_f32 lowpass;
 //constants for 50Hz lowpass
-float lowpass_const[] = {-0.2924 , 0.1085 , 0 , 0.5587 , 0.2573};//{a1 a2 b0 b1 b2} normalized coefficients (a0=1)
+float lowpass_const[] = {0.2928920553, 0.5857841107, 0.2928920554, -0, -0.17156822136};//{a0 a1 a2 -b1 -b2} van online calculator 
 //state values
-float lowpass_states[4];//WHAT IS THIS
+float lowpass_states[4];
 
 arm_biquad_casd_df1_inst_f32 highpass;
 //constants for 10Hz highpass
-float highpass_const[] = {-1.562, 0.6413,  1, -1.958 , 0.9576};//{a1 a2 b0 b1 b2} normalized coefficients (a0=1)
+float highpass_const[] = {0.8005910267, -1.6011820533, 0.8005910267, 1.5610153913, -0.6413487154};//{a0 a1 a2 -b1 -b2}
 //state values
-float highpass_states[4];//WHAT IS THIS
+float highpass_states[4];
 
 
 /** Looper function

--- a/main.cpp	Wed Oct 15 13:43:20 2014 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,74 +0,0 @@
-#include "mbed.h"
-#include "HIDScope.h"
-
-#include "arm_math.h"
-
-//Define objects
-AnalogIn    emg0(PTB1); //Analog input
-HIDScope scope(2);
-
-arm_biquad_casd_df1_inst_f32 lowpass;
-//constants for 5Hz lowpass
-float lowpass_const[] = {0.02008337 , 0.04016673 , 0.02008337 , 1.56101808 , -0.64135154};
-//state values
-float lowpass_states[4];
-arm_biquad_casd_df1_inst_f32 highpass;
-//constants for 0.5Hz highpass
-float highpass_const[] = {0.97803048, -1.95606096,  0.97803048, 1.95557824 , -0.95654368};
-//state values
-float highpass_states[4];
-
-
-/** Looper function
-* functions used for Ticker and Timeout should be of type void <name>(void)
-* i.e. no input arguments, no output arguments.
-* if you want to change a variable that you use in other places (for example in main)
-* you will have to make that variable global in order to be able to reach it both from
-* the function called at interrupt time, and in the main function.
-* To make a variable global, define it under the includes.
-* variables that are changed in the interrupt routine (written to) should be made
-* 'volatile' to let the compiler know that those values may change outside the current context.
-* i.e.: "volatile uint16_t emg_value;" instead of "uint16_t emg_value"
-* in the example below, the variable is not re-used in the main function, and is thus declared
-* local in the looper function only.
-**/
-void looper()
-{
-    /*variable to store value in*/    
-    uint16_t emg_value;
-    float filtered_emg;
-    float emg_value_f32;
-    /*put raw emg value both in red and in emg_value*/
-    emg_value = emg0.read_u16(); // read direct ADC result, converted to 16 bit integer (0..2^16 = 0..65536 = 0..3.3V)
-    emg_value_f32 = emg0.read();
-
-    //process emg
-    arm_biquad_cascade_df1_f32(&highpass, &emg_value_f32, &filtered_emg, 1 );
-    filtered_emg = fabs(filtered_emg);
-    arm_biquad_cascade_df1_f32(&lowpass, &filtered_emg, &filtered_emg, 1 );
-    
-    /*send value to PC. */
-    scope.set(0,emg_value);     //uint value
-    scope.set(1,filtered_emg);  //processed float
-    scope.send();
-
-}
-
-int main()
-{
-    Ticker log_timer;
-   //set up filters. Use external array for constants
-    arm_biquad_cascade_df1_init_f32(&lowpass,1 , lowpass_const, lowpass_states);
-    arm_biquad_cascade_df1_init_f32(&highpass,1 ,highpass_const,highpass_states);
-
-    /**Here you attach the 'void looper(void)' function to the Ticker object
-    * The looper() function will be called every 0.01 seconds.
-    * Please mind that the parentheses after looper are omitted when using attach.
-    */
-    log_timer.attach(looper, 0.005);
-    while(1) //Loop
-    {
-      /*Empty!*/
-      /*Everything is handled by the interrupt routine now!*/
-    }
-}
\ No newline at end of file