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
Diff: main.cpp
- Revision:
- 4:c8ec56d87a5b
- Parent:
- 3:9d5879b64f3c
- Child:
- 5:b96b7b8facbf
- Child:
- 10:1efe8b0cddd0
--- a/main.cpp Thu Oct 09 13:22:25 2014 +0000 +++ b/main.cpp Thu Oct 09 13:29:37 2014 +0000 @@ -12,23 +12,23 @@ #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}; + +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 lowpass_states[4]; +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]; - + void looper() { /*variable to store value in*/ @@ -38,24 +38,24 @@ /*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 ); + arm_biquad_cascade_df1_f32(¬ch, &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(¬ch,1 , notch_const, notch_states); arm_biquad_cascade_df1_init_f32(&highpass,1 ,highpass_const,highpass_states); log_timer.attach(looper, 0.005);