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@8:8a17f65622b4, 2014-09-10 (annotated)

Committer:
vsluiter
Date:
Wed Sep 10 05:05:59 2014 +0000
Revision:
8:8a17f65622b4
Parent:
7:3396c3e33928
Child:
9:d33e7b175ad7
Updated to read u16, reduced sample rate

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vsluiter 0:32bb76391d89 1 #include "mbed.h"
vsluiter 6:80c13d99aa55 2 #include "MODSERIAL.h"
vsluiter 0:32bb76391d89 3
vsluiter 4:8b298dfada81 4 //Define objects
vsluiter 7:3396c3e33928 5 AnalogIn emg0(PTB1); //Analog input
ArvidKeemink 1:db54d9412d18 6 PwmOut red(LED_RED); //PWM output
vsluiter 8:8a17f65622b4 7 Ticker log_timer;
vsluiter 8:8a17f65622b4 8 MODSERIAL pc(USBTX,USBRX);
vsluiter 2:e314bb3b2d99 9
vsluiter 4:8b298dfada81 10 /** Looper function
vsluiter 4:8b298dfada81 11 * functions used for Ticker and Timeout should be of type void <name>(void)
vsluiter 4:8b298dfada81 12 * i.e. no input arguments, no output arguments.
vsluiter 4:8b298dfada81 13 * if you want to change a variable that you use in other places (for example in main)
vsluiter 4:8b298dfada81 14 * you will have to make that variable global in order to be able to reach it both from
vsluiter 4:8b298dfada81 15 * the function called at interrupt time, and in the main function.
vsluiter 4:8b298dfada81 16 * To make a variable global, define it under the includes.
vsluiter 4:8b298dfada81 17 * variables that are changed in the interrupt routine (written to) should be made
vsluiter 4:8b298dfada81 18 * 'volatile' to let the compiler know that those values may change outside the current context.
vsluiter 8:8a17f65622b4 19 * i.e.: "volatile uint16_t emg_value;" instead of "uint16_t emg_value"
vsluiter 4:8b298dfada81 20 * in the example below, the variable is not re-used in the main function, and is thus declared
vsluiter 4:8b298dfada81 21 * local in the looper function only.
vsluiter 4:8b298dfada81 22 **/
vsluiter 2:e314bb3b2d99 23 void looper()
vsluiter 2:e314bb3b2d99 24 {
vsluiter 4:8b298dfada81 25 /*variable to store value in*/
vsluiter 8:8a17f65622b4 26 uint16_t emg_value;
vsluiter 4:8b298dfada81 27 /*put raw emg value both in red and in emg_value*/
vsluiter 8:8a17f65622b4 28 red = emg0.read(); // read float value (0..1 = 0..3.3V)
vsluiter 8:8a17f65622b4 29 emg_value = emg0.read_u16(); // read direct ADC result (0..4096 = 0..3.3V)
vsluiter 8:8a17f65622b4 30 /*send value to PC. Line below is used to prevent buffer overrun */
vsluiter 6:80c13d99aa55 31 if(pc.rxBufferGetSize(0)-pc.rxBufferGetCount() > 30)
vsluiter 8:8a17f65622b4 32 pc.printf("%u\n",emg_value);
vsluiter 5:4dacb7b72109 33 /**When not using the LED, the above could also have been done this way:
vsluiter 8:8a17f65622b4 34 * pc.printf("%u\n", emg0.read_u16());
vsluiter 5:4dacb7b72109 35 */
vsluiter 2:e314bb3b2d99 36 }
vsluiter 0:32bb76391d89 37
vsluiter 0:32bb76391d89 38 int main()
vsluiter 0:32bb76391d89 39 {
vsluiter 4:8b298dfada81 40 /*setup baudrate. Choose the same in your program on PC side*/
vsluiter 2:e314bb3b2d99 41 pc.baud(115200);
vsluiter 4:8b298dfada81 42 /*set the period for the PWM to the red LED*/
vsluiter 2:e314bb3b2d99 43 red.period_ms(2);
vsluiter 4:8b298dfada81 44 /**Here you attach the 'void looper(void)' function to the Ticker object
vsluiter 8:8a17f65622b4 45 * The looper() function will be called every 0.002 seconds.
vsluiter 4:8b298dfada81 46 * Please mind that the parentheses after looper are omitted when using attach.
vsluiter 4:8b298dfada81 47 */
vsluiter 8:8a17f65622b4 48 log_timer.attach(looper, 0.01);
ArvidKeemink 1:db54d9412d18 49 while(1) //Loop
vsluiter 0:32bb76391d89 50 {
vsluiter 4:8b298dfada81 51 /*Empty!*/
vsluiter 4:8b298dfada81 52 /*Everything is handled by the interrupt routine now!*/
vsluiter 0:32bb76391d89 53 }
vsluiter 0:32bb76391d89 54 }