4 directional EMG control of the XY table. Made during my bachelor end assignment.
Dependencies: C12832_lcd HIDScope mbed-dsp mbed
main.cpp
- Committer:
- jessekaiser
- Date:
- 2015-05-08
- Revision:
- 25:144eb5822aa7
- Parent:
- 24:c4c5d30a3938
- Child:
- 26:b88ff19ff5dc
File content as of revision 25:144eb5822aa7:
#include "mbed.h" #include "C12832_lcd.h" #include "arm_math.h" #include "HIDScope.h" #define P_GAIN 0.998 //Motor control DigitalOut Dir(p21); PwmOut Step(p22); //Signal to and from computer Serial pc(USBTX, USBRX); DigitalOut Enable(p25); //Microstepping DigitalOut MS1(p27); DigitalOut MS2(p28); DigitalOut MS3(p29); //Potmeter and EMG AnalogIn Pot1(p19); AnalogIn emg0(p17); //HIDScope scope(2); //lcd C12832_LCD lcd; //Variables for motor control float setpoint = 7000; //Frequentie float step_freq = 1; // Filters arm_biquad_casd_df1_inst_f32 lowpass_pot; arm_biquad_casd_df1_inst_f32 lowpass_step; //lowpass filter settings: Fc = 2 Hz, Fs = 100 Hz, Gain = 6 dB float lowpass_const[] = {0.007820199259120319, 0.015640398518240638, 0.007820199259120319, 1.7347238224240125, -0.7660046194604936}; //lowpass for step_freq: Fc = 2 Hz, Fs = 100, Gain = 6 dB float lowpass1_const[] = {0.007820199259120319, 0.015640398518240638, 0.007820199259120319, 1.7347238224240125, -0.7660046194604936}; //EMG filter arm_biquad_casd_df1_inst_f32 lowpass_biceps; //lowpass filter settings biceps: Fc = 2 Hz, Fs = 500 Hz, Gain = -3 dB float lowpass2_const[] = {0.00015514839749793376, 0.00031029679499586753, 0.00015514839749793376, 1.9644602512795832, -0.9650808448695751}; arm_biquad_casd_df1_inst_f32 highnotch_biceps; //highpass filter settings: Fc = 10 Hz, Fs = 500 Hz, Gain = -3 dB, notch Fc = 50, Fs =500Hz, Gain = -3 dB float highnotch_const[] = {0.9149684297741606, -1.8299368595483212, 0.9149684297741606, 1.8226935021735358, -0.8371802169231065 ,0.7063988100714527, -1.1429772843080923, 0.7063988100714527, 1.1429772843080923, -0.41279762014290533}; //state values float lowpass_biceps_states[4]; float highnotch_biceps_states[8]; float lowpass_pot_states[4]; float lowpass1_step_states[4]; //global variabels float filtered_biceps; float filtered_pot; float filtered_average_pot; float filtered_step; float pot_value1_f32; void looper_emg() { /*variable to store value in*/ volatile uint16_t emg_value1; float emg_value1_f32; /*put raw emg value both in red and in emg_value*/ emg_value1 = emg0.read_u16(); // read direct ADC result, converted to 16 bit integer (0..2^16 = 0..65536 = 0..3.3V) emg_value1_f32 = emg0.read(); //process emg biceps arm_biquad_cascade_df1_f32(&highnotch_biceps, &emg_value1_f32, &filtered_biceps, 1 ); filtered_biceps = fabs(filtered_biceps); arm_biquad_cascade_df1_f32(&lowpass_biceps, &filtered_biceps, &filtered_biceps, 1 ); /*send value to PC. */ //scope.set(0,emg_value1); //Raw EMG signal biceps //scope.set(1,filtered_biceps); //Filtered signal //scope.send(); } void looper_pot() { pot_value1_f32 = Pot1.read() - 0.500; //process input arm_biquad_cascade_df1_f32(&lowpass_pot, &pot_value1_f32, &filtered_pot, 1 ); } void looper_motor() { float new_step_freq; new_step_freq = (setpoint*pot_value1_f32*2); step_freq = abs(new_step_freq); //Gives the PWM frequenty to the motor. arm_biquad_cascade_df1_f32(&lowpass_step, &step_freq, &filtered_step, 1); if (step_freq < 700) { Enable = 1; } else { Enable = 0; } Step.period(1.0/step_freq); } int main() { /*Ticker log_timer; //set up filters. Use external array for constants arm_biquad_cascade_df1_init_f32(&lowpass_pot, 1 , lowpass_const, lowpass_pot_states); log_timer.attach(looper_pot, 0.01);*/ Ticker emgtimer; arm_biquad_cascade_df1_init_f32(&lowpass_biceps, 1 , lowpass_const, lowpass_biceps_states); arm_biquad_cascade_df1_init_f32(&highnotch_biceps, 2 , highnotch_const, highnotch_biceps_states); emgtimer.attach(looper_emg, 0.01); Ticker looptimer; arm_biquad_cascade_df1_init_f32(&lowpass_step, 1, lowpass1_const, lowpass1_step_states); looptimer.attach(looper_motor, 0.01); MS1 = 1; MS2 = 0; MS3 = 0; Step.period(1./step_freq); // 1 kHz, vanaf 2,5 kHz doet de motor het niet meer. Step.write(0.5); // Duty cycle van 50% while (1) { if (pot_value1_f32 < 0) { //Directie controle. Dir = 0; } else { Dir = 1; } //lcd.printf("Spd %.0f Hz p1 %.4f \n", step_freq, pot_value1_f32); //snelheid meting op lcd pc.printf("filt %.3f raw %.3f \n", filtered_biceps, emg0.read()); lcd.printf("filt %.3f raw %.3f \n", filtered_biceps, emg0.read()); //pc.printf("Spd %.0f Hz p1 %.4f \n", step_freq, pot_value1_f32); //snelheid meting op lcd wait(0.1); } }