Projectgroep 20 Biorobotics / Mbed 2 deprecated EMG

Script voor het weergeven van 1 EMG signaal met behulp van een OLIMEX shield. Let hierbij goed op dat je de juiste pinnetjes op het OLIMEX shield verbonden hebt, in dit geval A0 als uitgang. Verder maken we gebruik van 3,3 Volt!

Dependencies:   HIDScope mbed

Fork of EMG by Tom Tom

main.cpp@5:4dacb7b72109, 2013-10-02 (annotated)

Committer:
vsluiter
Date:
Wed Oct 02 09:45:01 2013 +0000
Revision:
5:4dacb7b72109
Parent:
4:8b298dfada81
Child:
6:80c13d99aa55
Added comments

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vsluiter 0:32bb76391d89 1 #include "mbed.h"
vsluiter 0:32bb76391d89 2
vsluiter 4:8b298dfada81 3 //Define objects
ArvidKeemink 1:db54d9412d18 4 AnalogIn emg0(PTB0); //Analog input
ArvidKeemink 1:db54d9412d18 5 PwmOut red(LED_RED); //PWM output
vsluiter 2:e314bb3b2d99 6 Ticker timer;
vsluiter 2:e314bb3b2d99 7 Serial pc(USBTX,USBRX);
vsluiter 2:e314bb3b2d99 8
vsluiter 4:8b298dfada81 9 /** Looper function
vsluiter 4:8b298dfada81 10 * functions used for Ticker and Timeout should be of type void <name>(void)
vsluiter 4:8b298dfada81 11 * i.e. no input arguments, no output arguments.
vsluiter 4:8b298dfada81 12 * if you want to change a variable that you use in other places (for example in main)
vsluiter 4:8b298dfada81 13 * you will have to make that variable global in order to be able to reach it both from
vsluiter 4:8b298dfada81 14 * the function called at interrupt time, and in the main function.
vsluiter 4:8b298dfada81 15 * To make a variable global, define it under the includes.
vsluiter 4:8b298dfada81 16 * variables that are changed in the interrupt routine (written to) should be made
vsluiter 4:8b298dfada81 17 * 'volatile' to let the compiler know that those values may change outside the current context.
vsluiter 4:8b298dfada81 18 * i.e.: "volatile float emg_value;" instead of "float emg_value"
vsluiter 4:8b298dfada81 19 * in the example below, the variable is not re-used in the main function, and is thus declared
vsluiter 4:8b298dfada81 20 * local in the looper function only.
vsluiter 4:8b298dfada81 21 **/
vsluiter 2:e314bb3b2d99 22 void looper()
vsluiter 2:e314bb3b2d99 23 {
vsluiter 4:8b298dfada81 24 /*variable to store value in*/
vsluiter 4:8b298dfada81 25 float emg_value;
vsluiter 4:8b298dfada81 26 /*put raw emg value both in red and in emg_value*/
vsluiter 4:8b298dfada81 27 red = emg_value = emg0.read();
vsluiter 5:4dacb7b72109 28 /*send value to PC. use 6 digits after decimal sign*/
vsluiter 4:8b298dfada81 29 pc.printf("%.6f\n",emg_value);
vsluiter 5:4dacb7b72109 30 /**When not using the LED, the above could also have been done this way:
vsluiter 5:4dacb7b72109 31 * pc.printf("%.6\n", emg0.read());
vsluiter 5:4dacb7b72109 32 */
vsluiter 2:e314bb3b2d99 33 }
vsluiter 0:32bb76391d89 34
vsluiter 0:32bb76391d89 35 int main()
vsluiter 0:32bb76391d89 36 {
vsluiter 4:8b298dfada81 37 /*setup baudrate. Choose the same in your program on PC side*/
vsluiter 2:e314bb3b2d99 38 pc.baud(115200);
vsluiter 4:8b298dfada81 39 /*set the period for the PWM to the red LED*/
vsluiter 2:e314bb3b2d99 40 red.period_ms(2);
vsluiter 4:8b298dfada81 41 /**Here you attach the 'void looper(void)' function to the Ticker object
vsluiter 4:8b298dfada81 42 * The looper() function will be called every 0.001 seconds.
vsluiter 4:8b298dfada81 43 * Please mind that the parentheses after looper are omitted when using attach.
vsluiter 4:8b298dfada81 44 */
vsluiter 2:e314bb3b2d99 45 timer.attach(looper, 0.001);
ArvidKeemink 1:db54d9412d18 46 while(1) //Loop
vsluiter 0:32bb76391d89 47 {
vsluiter 4:8b298dfada81 48 /*Empty!*/
vsluiter 4:8b298dfada81 49 /*Everything is handled by the interrupt routine now!*/
vsluiter 0:32bb76391d89 50 }
vsluiter 0:32bb76391d89 51 }