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4 directional EMG control of the XY table. Made during my bachelor end assignment.
Dependencies: C12832_lcd HIDScope mbed-dsp mbed
Diff: main.cpp
- Revision:
- 18:71a01477e264
- Parent:
- 17:03f523424eb2
- Child:
- 19:f0875bc3b72f
diff -r 03f523424eb2 -r 71a01477e264 main.cpp --- a/main.cpp Wed Apr 29 14:57:07 2015 +0000 +++ b/main.cpp Fri May 01 10:28:43 2015 +0000 @@ -1,5 +1,6 @@ #include "mbed.h" #include "C12832_lcd.h" +#include "arm_math.h" #define P_GAIN 0.998 @@ -16,37 +17,67 @@ BusIn Joystick(p12,p13,p14,p15,p16); DigitalIn Up(p15); DigitalIn Down(p12); + + +// Filter +arm_biquad_casd_df1_inst_f32 lowpass_p1; + +//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}; + +//state values +float lowpass_p1_states[4]; +float filtered_p1; + +// EMG looper +void looper() +{ + /*variable to store value in*/ + uint16_t p1; + + float p1_f32; + /*put raw emg value both in red and in emg_value*/ + p1 = Pot1.read_u16(); // read direct ADC result, converted to 16 bit integer (0..2^16 = 0..65536 = 0..3.3V) + p1_f32 = Pot1.read()-0.5; + + //process emg biceps + + arm_biquad_cascade_df1_f32(&lowpass_p1, &filtered_p1, &filtered_p1, 1 ); + + float setpoint = 7000; //Frequentie + float step_freq = 1; int main() -{ +{ Ticker log_timer; + //set up filters. Use external array for constants + arm_biquad_cascade_df1_init_f32(&lowpass_p1,1 , lowpass_const, lowpass_p1_states); + log_timer.attach(looper, 0.01); Enable = 0; - float setpoint = 7000; //Frequentie - float step_freq = 1; + MS1 = 1; MS2 = 0; MS3 = 0; - float p1; - int dir1; + //float p1; + 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% // Dir = Pot1; // Dir 1 is naar boven, Dir 0 naar onder. Enable = 1; while (1) { - - if (p1 < 0) { //Directie controle. + + if (p1_f32 < 0) { //Directie controle. Dir = 0; - } else if (p1 > 0) { + } else if (p1_f32 > 0) { Dir = 1; } - p1 = Pot1.read() - 0.500; //Offset creëren [-0.500;0.500] + //p1 = Pot1.read() - 0.500; //Offset creëren [-0.500;0.500] //Dir = dir1; float new_step_freq; //new_step_freq = ((1-P_GAIN)*setpoint) + (P_GAIN*step_freq); - new_step_freq = (setpoint*p1*2); + new_step_freq = (setpoint*filtered_p1*2); step_freq = abs(new_step_freq); //Geeft een frequentie in 100 stappen. Step.period(1.0/step_freq); - wait(0.1); //Hier nog ticker inbouwen - lcd.printf("Spd %.0f Hz p1 %.2f \n", step_freq, p1); //snelheid meting op lcd, zonder decimalen + wait(0.01); //Hier nog ticker inbouwen + lcd.printf("Spd %.0f Hz p1 %.2f \n", step_freq, filtered_p1); //snelheid meting op lcd, zonder decimalen } -} \ No newline at end of file