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This is a test version
Dependencies: HIDScope MODSERIAL QEI mbed
Fork of Filter_EMG by
main.cpp@1:b9471e519760, 2015-10-18 (annotated)
- Committer:
- bvgool
- Date:
- Sun Oct 18 14:11:58 2015 +0000
- Revision:
- 1:b9471e519760
- Parent:
- 0:8ccd4c66e07f
this is a test version
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dbayuadi | 0:8ccd4c66e07f | 1 | #include "mbed.h" |
bvgool | 1:b9471e519760 | 2 | #include "MODSERIAL.h" |
bvgool | 1:b9471e519760 | 3 | #include "math.h" |
dbayuadi | 0:8ccd4c66e07f | 4 | #include "HIDScope.h" |
dbayuadi | 0:8ccd4c66e07f | 5 | |
dbayuadi | 0:8ccd4c66e07f | 6 | |
bvgool | 1:b9471e519760 | 7 | AnalogIn EMG(A1); |
bvgool | 1:b9471e519760 | 8 | MODSERIAL pc(USBTX, USBRX); |
bvgool | 1:b9471e519760 | 9 | |
bvgool | 1:b9471e519760 | 10 | //const int baudrate = 115200; |
bvgool | 1:b9471e519760 | 11 | //const int ms_wait = 100; |
bvgool | 1:b9471e519760 | 12 | |
bvgool | 1:b9471e519760 | 13 | // Define the HIDScope and Ticker objects |
bvgool | 1:b9471e519760 | 14 | HIDScope scope(1); |
bvgool | 1:b9471e519760 | 15 | Ticker scopeTimer; |
bvgool | 1:b9471e519760 | 16 | |
bvgool | 1:b9471e519760 | 17 | // Define moving average variables |
bvgool | 1:b9471e519760 | 18 | const int N = 125; |
bvgool | 1:b9471e519760 | 19 | double a; |
bvgool | 1:b9471e519760 | 20 | |
bvgool | 1:b9471e519760 | 21 | // Define the storage variables and filter coe icients for two filters |
bvgool | 1:b9471e519760 | 22 | double f1_v1 = 0, f1_v2 = 0, f2_v1 = 0, f2_v2 = 0; |
bvgool | 1:b9471e519760 | 23 | const double f1_a1 = -1.822694925196308, f1_a2 = 0.837181651256022, f1_b0 = 0.914969144113083, f1_b1 = -1.829938288226165, f1_b2 = 0.914969144113083; |
bvgool | 1:b9471e519760 | 24 | const double f2_a1 = -1.142980502539901, f2_a2 = 0.412801598096189, f2_b0 = 0.067455273889072, f2_b1 = 0.134910547778144, f2_b2 = 0.067455273889072; |
dbayuadi | 0:8ccd4c66e07f | 25 | |
bvgool | 1:b9471e519760 | 26 | double biquad( double u, double &v1, double &v2, const double a1, const double a2, const double b0, const double b1, const double b2 ) |
bvgool | 1:b9471e519760 | 27 | { |
bvgool | 1:b9471e519760 | 28 | double v = u-a1*v1-a2*v2; |
bvgool | 1:b9471e519760 | 29 | double y = b0*v + b1*v1 + b2*v2; |
bvgool | 1:b9471e519760 | 30 | v2 = v1; v1 = v; |
bvgool | 1:b9471e519760 | 31 | return y; |
bvgool | 1:b9471e519760 | 32 | } |
dbayuadi | 0:8ccd4c66e07f | 33 | |
bvgool | 1:b9471e519760 | 34 | double sliding_average(double u,const int f_N) |
bvgool | 1:b9471e519760 | 35 | { |
bvgool | 1:b9471e519760 | 36 | double f_x[f_N]; |
bvgool | 1:b9471e519760 | 37 | double f_sum=0; |
bvgool | 1:b9471e519760 | 38 | f_x[1]=abs(u); |
bvgool | 1:b9471e519760 | 39 | for (int i=f_N; i>=1; i--){ |
bvgool | 1:b9471e519760 | 40 | f_x[i]=f_x[i-1]; |
bvgool | 1:b9471e519760 | 41 | } |
bvgool | 1:b9471e519760 | 42 | |
bvgool | 1:b9471e519760 | 43 | |
bvgool | 1:b9471e519760 | 44 | for (int i=f_N; i>=0; i--){ |
bvgool | 1:b9471e519760 | 45 | f_sum=f_x[i]+f_sum; |
bvgool | 1:b9471e519760 | 46 | } |
bvgool | 1:b9471e519760 | 47 | a=f_sum/double(f_N); |
bvgool | 1:b9471e519760 | 48 | f_sum=0; |
bvgool | 1:b9471e519760 | 49 | return a; |
bvgool | 1:b9471e519760 | 50 | } |
dbayuadi | 0:8ccd4c66e07f | 51 | |
dbayuadi | 0:8ccd4c66e07f | 52 | |
dbayuadi | 0:8ccd4c66e07f | 53 | |
dbayuadi | 0:8ccd4c66e07f | 54 | |
bvgool | 1:b9471e519760 | 55 | void scopeSend(){ |
bvgool | 1:b9471e519760 | 56 | double u1 = EMG.read() ; //filter 1 input |
bvgool | 1:b9471e519760 | 57 | double y1 = biquad( u1, f1_v1, f1_v2, f1_a1, f1_a2, f1_b0, f1_b1, f1_b2 ); //notch |
bvgool | 1:b9471e519760 | 58 | double y2 = biquad( y1, f2_v1, f2_v2, f2_a1, f2_a2, f2_b0, f2_b1, f2_b2 ); //lowpass with rectifier |
bvgool | 1:b9471e519760 | 59 | double z1 = 3*sliding_average(y2, N); //moving average |
bvgool | 1:b9471e519760 | 60 | scope.set(0,z1); |
bvgool | 1:b9471e519760 | 61 | scope.send(); |
bvgool | 1:b9471e519760 | 62 | } |
bvgool | 1:b9471e519760 | 63 | |
dbayuadi | 0:8ccd4c66e07f | 64 | int main() |
dbayuadi | 0:8ccd4c66e07f | 65 | { |
bvgool | 1:b9471e519760 | 66 | scopeTimer.attach(&scopeSend,0.002); |
bvgool | 1:b9471e519760 | 67 | while(1){} |
dbayuadi | 0:8ccd4c66e07f | 68 | |
dbayuadi | 0:8ccd4c66e07f | 69 | } |