werkend filter: 50 hz notch 20 hz hoogdoorlaat 80 hz laagdoorlaat geabsoluteerd vermenigvuldigd met 10
Dependencies: HIDScope mbed-dsp mbed
Fork of Project5-filtering2 by
main.cpp
- Committer:
- Daanmk
- Date:
- 2014-10-09
- Revision:
- 0:68c8cf9a1f96
- Child:
- 1:a21d78fa1712
File content as of revision 0:68c8cf9a1f96:
/***************************************/ /* */ /* BRONCODE GROEP 5, MODULE 9, 2014 */ /* *****-THE SLAP-****** */ /* */ /* -Dominique Clevers */ /* -Rianne van Dommelen */ /* -Daan de Muinck Keizer */ /* -David den Houting */ /* -Marjolein Thijssen */ /***************************************/ #include "mbed.h" #include "HIDScope.h" #include "arm_math.h" //Define objects AnalogIn emg0(PTB0); //Biceps AnalogIn emg1(PTB1); //Triceps 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]; 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); log_timer.attach(looper, 0.005); while(1) //Loop { /*Empty!*/ /*Everything is handled by the interrupt routine now!*/ } }