Hidde van der Bijl / Mbed 2 deprecated EMG2

Dependencies:   mbed HIDScope biquadFilter

main.cpp@21:48b40b82d195, 2019-10-11 (annotated)

Committer:
hidde1104
Date:
Fri Oct 11 09:12:11 2019 +0000
Revision:
21:48b40b82d195
Parent:
20:97059009a491
Child:
22:65c90d816235
Child:
27:c53dd84c38aa
EMG filter;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vsluiter 0:32bb76391d89 1 #include "mbed.h"
vsluiter 11:ce72ec658a95 2 #include "HIDScope.h"
hidde1104 21:48b40b82d195 3 #include "BiQuad.h"
hidde1104 21:48b40b82d195 4
hidde1104 21:48b40b82d195 5
hidde1104 21:48b40b82d195 6 BiQuad bq1 (0.881889334678067, -1.76377866935613, 0.8818893346780671, -1.77069673005903, 0.797707797506027);
hidde1104 21:48b40b82d195 7
hidde1104 21:48b40b82d195 8 BiQuad bq2 (0.000198358203463849, 0.000396716406927699, 0.000198358203463849, -1.96262073248799, 0.963423352820821);
hidde1104 21:48b40b82d195 9
hidde1104 21:48b40b82d195 10
hidde1104 21:48b40b82d195 11 BiQuadChain bqc;
hidde1104 21:48b40b82d195 12
vsluiter 0:32bb76391d89 13
vsluiter 4:8b298dfada81 14 //Define objects
tomlankhorst 19:2bf824669684 15 AnalogIn emg0( A0 );
tomlankhorst 19:2bf824669684 16 AnalogIn emg1( A1 );
tomlankhorst 19:2bf824669684 17
tomlankhorst 14:f83354387756 18 Ticker sample_timer;
hidde1104 21:48b40b82d195 19 HIDScope scope( 3 );
tomlankhorst 18:21d8e7a81cf5 20 DigitalOut led(LED1);
vsluiter 2:e314bb3b2d99 21
tomlankhorst 14:f83354387756 22 /** Sample function
tomlankhorst 14:f83354387756 23 * this function samples the emg and sends it to HIDScope
tomlankhorst 14:f83354387756 24 **/
hidde1104 21:48b40b82d195 25
hidde1104 21:48b40b82d195 26 float sample_max = 0;
hidde1104 21:48b40b82d195 27 float sample_min = 1;
tomlankhorst 14:f83354387756 28 void sample()
vsluiter 2:e314bb3b2d99 29 {
tomlankhorst 19:2bf824669684 30 /* Set the sampled emg values in channel 0 (the first channel) and 1 (the second channel) in the 'HIDScope' instance named 'scope' */
hidde1104 21:48b40b82d195 31 float emg0_value = emg0.read();
hidde1104 21:48b40b82d195 32 float emg1_value = emg1.read();
hidde1104 21:48b40b82d195 33
hidde1104 21:48b40b82d195 34 //double filter_value = bqc.step(emg1_value);
hidde1104 21:48b40b82d195 35 float filter_value = fabs(bq2.step(fabs(bq1.step(emg0_value - emg1_value))));
hidde1104 21:48b40b82d195 36 if (filter_value > sample_max) {
hidde1104 21:48b40b82d195 37 sample_max = filter_value;
hidde1104 21:48b40b82d195 38 }
hidde1104 21:48b40b82d195 39 if (sample_min > filter_value) {
hidde1104 21:48b40b82d195 40 sample_min = filter_value;
hidde1104 21:48b40b82d195 41 }
hidde1104 21:48b40b82d195 42
hidde1104 21:48b40b82d195 43 filter_value = filter_value-sample_min;
hidde1104 21:48b40b82d195 44 filter_value = filter_value/(sample_max-sample_min);
hidde1104 21:48b40b82d195 45
tomlankhorst 19:2bf824669684 46 scope.set(0, emg0.read() );
tomlankhorst 19:2bf824669684 47 scope.set(1, emg1.read() );
hidde1104 21:48b40b82d195 48 scope.set(2, filter_value);
tomlankhorst 19:2bf824669684 49 /* Repeat the step above if required for more channels of required (channel 0 up to 5 = 6 channels)
tomlankhorst 19:2bf824669684 50 * Ensure that enough channels are available (HIDScope scope( 2 ))
tomlankhorst 20:97059009a491 51 * Finally, send all channels to the PC at once */
vsluiter 11:ce72ec658a95 52 scope.send();
tomlankhorst 18:21d8e7a81cf5 53 /* To indicate that the function is working, the LED is toggled */
tomlankhorst 18:21d8e7a81cf5 54 led = !led;
vsluiter 2:e314bb3b2d99 55 }
vsluiter 0:32bb76391d89 56
vsluiter 0:32bb76391d89 57 int main()
tomlankhorst 19:2bf824669684 58 {
hidde1104 21:48b40b82d195 59 bqc.add( &bq1);
tomlankhorst 14:f83354387756 60 /**Attach the 'sample' function to the timer 'sample_timer'.
tomlankhorst 19:2bf824669684 61 * this ensures that 'sample' is executed every... 0.002 seconds = 500 Hz
vsluiter 4:8b298dfada81 62 */
tomlankhorst 19:2bf824669684 63 sample_timer.attach(&sample, 0.002);
tomlankhorst 15:0da764eea774 64
tomlankhorst 14:f83354387756 65 /*empty loop, sample() is executed periodically*/
tomlankhorst 15:0da764eea774 66 while(1) {}
hidde1104 21:48b40b82d195 67 }