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:
- 2014-10-10
- Revision:
- 8:27b5468c77bc
- Parent:
- 7:46806eb44597
- Child:
- 9:26f75461bace
File content as of revision 8:27b5468c77bc:
/***************************************/ /* */ /* 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 PwmOut blue(LED_BLUE); HIDScope scope(5); arm_biquad_casd_df1_inst_f32 lowpass; //constants for 80Hz lowpass float lowpass_const[] = {0.6389437261127493, 1.2778874522254986, 0.6389437261127493, 1.1429772843080919, 0.4127976201429053}; //state values float lowpass_states[4]; arm_biquad_casd_df1_inst_f32 notch; //constants for 50Hz notch float notch_const[] = {0.5857841106784856, -1.3007020142696517e-16, 0.5857841106784856, -1.3007020142696517e-16, 0.17156822135697122}; //state values float notch_states[4]; arm_biquad_casd_df1_inst_f32 highpass; //constants for 5Hz highpass float highpass_const[] = {0.8948577513857248, -1.7897155027714495, 0.8948577513857248, 0.8008009266036016}; //state values float highpass_states[4]; arm_biquad_casd_df1_inst_f32 envelop; //constants for 5Hz lowpass float envelop_const[] = {0.005542711916075981, 0.011085423832151962, 0.005542711916075981, -1.7786300789392977, 0.8008009266036016}; //state values float envelop_states[4]; void looper() { /*variable to store value in*/ uint16_t emg_value; float filtered_emg; float filtered_emg_notch; float filtered_emg_low; float filtered_emg_abs; float filtered_emg_env; 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 ); arm_biquad_cascade_df1_f32(¬ch, &filtered_emg, &filtered_emg_notch, 1 ); arm_biquad_cascade_df1_f32(&lowpass, &filtered_emg_notch, &filtered_emg_low, 1 ); filtered_emg_abs = fabs(filtered_emg_low); arm_biquad_cascade_df1_f32(&envelop, &filtered_emg_abs, &filtered_emg_env, 1 ); blue = emg0.read(); /*send value to PC. */ scope.set(0,emg_value); //uint value scope.set(1,filtered_emg); //processed float scope.set(2,filtered_emg_notch); scope.set(3,filtered_emg_low); scope.set(4,filtered_emg_abs); scope.set(5,filtered_emg_env); 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(¬ch,1 , notch_const, notch_states); arm_biquad_cascade_df1_init_f32(&highpass,1 ,highpass_const,highpass_states); arm_biquad_cascade_df1_init_f32(&envelop,1 ,envelop_const, envelop_states); log_timer.attach(looper, 0.005); while(1) //Loop { /*Empty!*/ /*Everything is handled by the interrupt routine now!*/ } }