This is a test version
Dependencies: HIDScope MODSERIAL QEI mbed
Fork of Filter_EMG by
main.cpp@0:8ccd4c66e07f, 2015-10-07 (annotated)
- Committer:
- dbayuadi
- Date:
- Wed Oct 07 20:52:18 2015 +0000
- Revision:
- 0:8ccd4c66e07f
- Child:
- 1:b9471e519760
Implementing high pass notch and low pass filter for EMG measurement
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dbayuadi | 0:8ccd4c66e07f | 1 | #include "mbed.h" |
dbayuadi | 0:8ccd4c66e07f | 2 | #include "HIDScope.h" |
dbayuadi | 0:8ccd4c66e07f | 3 | #include "QEI.h" |
dbayuadi | 0:8ccd4c66e07f | 4 | AnalogIn emg(A0) |
dbayuadi | 0:8ccd4c66e07f | 5 | HIDScope scope(1); |
dbayuadi | 0:8ccd4c66e07f | 6 | Ticker get; |
dbayuadi | 0:8ccd4c66e07f | 7 | AnalogIn pot(A1); |
dbayuadi | 0:8ccd4c66e07f | 8 | Serial pc(USBTX, USBRX); // tx, rx |
dbayuadi | 0:8ccd4c66e07f | 9 | |
dbayuadi | 0:8ccd4c66e07f | 10 | volatile bool fn_go = false; |
dbayuadi | 0:8ccd4c66e07f | 11 | double y_notch_1; |
dbayuadi | 0:8ccd4c66e07f | 12 | double y_notch_2; |
dbayuadi | 0:8ccd4c66e07f | 13 | double y_high; |
dbayuadi | 0:8ccd4c66e07f | 14 | double y_low; |
dbayuadi | 0:8ccd4c66e07f | 15 | |
dbayuadi | 0:8ccd4c66e07f | 16 | const double Fs = 500; |
dbayuadi | 0:8ccd4c66e07f | 17 | const double Ts = 0.002; |
dbayuadi | 0:8ccd4c66e07f | 18 | |
dbayuadi | 0:8ccd4c66e07f | 19 | const double gain_notch_1 = 0.912483; |
dbayuadi | 0:8ccd4c66e07f | 20 | const double b0_notch_1 = 1.0*gain_notch_1; |
dbayuadi | 0:8ccd4c66e07f | 21 | const double b1_notch_1 = -1.62829098849*gain_notch_1; |
dbayuadi | 0:8ccd4c66e07f | 22 | const double b2_notch_1 = 1.0*gain_notch_1; |
dbayuadi | 0:8ccd4c66e07f | 23 | const double a1_notch_1 = -1.49965530713; |
dbayuadi | 0:8ccd4c66e07f | 24 | const double a2_notch_1 = 0.90720693582; |
dbayuadi | 0:8ccd4c66e07f | 25 | double v1_notch_1 = 0, v2_notch_1 = 0; |
dbayuadi | 0:8ccd4c66e07f | 26 | |
dbayuadi | 0:8ccd4c66e07f | 27 | |
dbayuadi | 0:8ccd4c66e07f | 28 | const double gain_notch_2 = 1.000000; |
dbayuadi | 0:8ccd4c66e07f | 29 | const double b0_notch_2 = 1.0*gain_notch_2; |
dbayuadi | 0:8ccd4c66e07f | 30 | const double b1_notch_2 = -1.63220522905*gain_notch_2; |
dbayuadi | 0:8ccd4c66e07f | 31 | const double b2_notch_2 = 1.0*gain_notch_2; |
dbayuadi | 0:8ccd4c66e07f | 32 | const double a1_notch_2 = -1.61200955424; |
dbayuadi | 0:8ccd4c66e07f | 33 | const double a2_notch_2 = 0.91813588764; |
dbayuadi | 0:8ccd4c66e07f | 34 | double v1_notch_2 = 0, v2_notch_2 = 0; |
dbayuadi | 0:8ccd4c66e07f | 35 | |
dbayuadi | 0:8ccd4c66e07f | 36 | const double gain_high = 0.956602; |
dbayuadi | 0:8ccd4c66e07f | 37 | const double b0_high = 1.0*gain_high; |
dbayuadi | 0:8ccd4c66e07f | 38 | const double b1_high = -1.99999962667*gain_high; |
dbayuadi | 0:8ccd4c66e07f | 39 | const double b2_high = 1.0*gain_high; |
dbayuadi | 0:8ccd4c66e07f | 40 | const double a1_high = -1.91152224950; |
dbayuadi | 0:8ccd4c66e07f | 41 | const double a2_high = 0.91532727281; |
dbayuadi | 0:8ccd4c66e07f | 42 | double v1_high = 0, v2_high = 0; |
dbayuadi | 0:8ccd4c66e07f | 43 | |
dbayuadi | 0:8ccd4c66e07f | 44 | const double gain_low = 0.003428; |
dbayuadi | 0:8ccd4c66e07f | 45 | const double b0_low = 1.0*gain_low; |
dbayuadi | 0:8ccd4c66e07f | 46 | const double b1_low = 2.00000000000*gain_low; |
dbayuadi | 0:8ccd4c66e07f | 47 | const double b2_low = 1.0*gain_low; |
dbayuadi | 0:8ccd4c66e07f | 48 | const double a1_low = -1.86528269522; |
dbayuadi | 0:8ccd4c66e07f | 49 | const double a2_low = 0.87380140464; |
dbayuadi | 0:8ccd4c66e07f | 50 | double v1_low = 0, v2_low = 0; |
dbayuadi | 0:8ccd4c66e07f | 51 | |
dbayuadi | 0:8ccd4c66e07f | 52 | |
dbayuadi | 0:8ccd4c66e07f | 53 | double biquad(double u, double&v1,double&v2,const double a1, const double a2, const double b0, const double b1, const double b2) |
dbayuadi | 0:8ccd4c66e07f | 54 | { |
dbayuadi | 0:8ccd4c66e07f | 55 | double v = u - a1*v1 - a2*v2; |
dbayuadi | 0:8ccd4c66e07f | 56 | double y = b0*v + b1*v1 + b2*v2; |
dbayuadi | 0:8ccd4c66e07f | 57 | v2 = v1; |
dbayuadi | 0:8ccd4c66e07f | 58 | v1 = v; |
dbayuadi | 0:8ccd4c66e07f | 59 | return y; |
dbayuadi | 0:8ccd4c66e07f | 60 | } |
dbayuadi | 0:8ccd4c66e07f | 61 | |
dbayuadi | 0:8ccd4c66e07f | 62 | void fn_activate() |
dbayuadi | 0:8ccd4c66e07f | 63 | { |
dbayuadi | 0:8ccd4c66e07f | 64 | |
dbayuadi | 0:8ccd4c66e07f | 65 | fn_go = true; |
dbayuadi | 0:8ccd4c66e07f | 66 | } |
dbayuadi | 0:8ccd4c66e07f | 67 | |
dbayuadi | 0:8ccd4c66e07f | 68 | void scopeSend() |
dbayuadi | 0:8ccd4c66e07f | 69 | { |
dbayuadi | 0:8ccd4c66e07f | 70 | y_high = biquad(emg.read(), v1_high, v1_high, a1_high, a2_high, b0_high, b1_high, b2_high); |
dbayuadi | 0:8ccd4c66e07f | 71 | y_notch_1 = biquad(y_high, v1_notch_1, v1_notch_1, a1_notch_1,a2_notch_1,b0_notch_1, b1_notch_1, b2_notch_1); |
dbayuadi | 0:8ccd4c66e07f | 72 | y_notch_2 = biquad(y_notch_1, v1_notch_2, v1_notch_2, a1_notch_2, a2_notch_2, b0_notch_2, b1_notch_2, b2_notch_2); |
dbayuadi | 0:8ccd4c66e07f | 73 | |
dbayuadi | 0:8ccd4c66e07f | 74 | y_low = biquad(y_high, v1_low, v1_low, a1_low, a2_low, b0_low, b1_low, b2_low); |
dbayuadi | 0:8ccd4c66e07f | 75 | scope.set(0,y_low); |
dbayuadi | 0:8ccd4c66e07f | 76 | scope.send(); |
dbayuadi | 0:8ccd4c66e07f | 77 | } |
dbayuadi | 0:8ccd4c66e07f | 78 | |
dbayuadi | 0:8ccd4c66e07f | 79 | int main() |
dbayuadi | 0:8ccd4c66e07f | 80 | { |
dbayuadi | 0:8ccd4c66e07f | 81 | get.attach(&fn_activate,Ts); |
dbayuadi | 0:8ccd4c66e07f | 82 | |
dbayuadi | 0:8ccd4c66e07f | 83 | while (true) { |
dbayuadi | 0:8ccd4c66e07f | 84 | |
dbayuadi | 0:8ccd4c66e07f | 85 | if(fn_go == true) { |
dbayuadi | 0:8ccd4c66e07f | 86 | |
dbayuadi | 0:8ccd4c66e07f | 87 | scopeSend(); |
dbayuadi | 0:8ccd4c66e07f | 88 | |
dbayuadi | 0:8ccd4c66e07f | 89 | |
dbayuadi | 0:8ccd4c66e07f | 90 | fn_go = false; |
dbayuadi | 0:8ccd4c66e07f | 91 | } |
dbayuadi | 0:8ccd4c66e07f | 92 | } |
dbayuadi | 0:8ccd4c66e07f | 93 | } |