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Measures EMG signal, filters them and puts on a led
Dependencies: HIDScope MODSERIAL Math MovingAverage biquadFilter mbed
Fork of EMG by
main.cpp
- Committer:
- vsluiter
- Date:
- 2014-09-11
- Revision:
- 12:768048d7f742
- Parent:
- 10:09b8424a7b39
File content as of revision 12:768048d7f742:
#include "mbed.h" #include "MODSERIAL.h" //Define objects AnalogIn emg0(PTB1); //Analog input PwmOut red(LED_RED); //PWM output Ticker log_timer; MODSERIAL pc(USBTX,USBRX); /** Looper function * functions used for Ticker and Timeout should be of type void <name>(void) * i.e. no input arguments, no output arguments. * if you want to change a variable that you use in other places (for example in main) * you will have to make that variable global in order to be able to reach it both from * the function called at interrupt time, and in the main function. * To make a variable global, define it under the includes. * variables that are changed in the interrupt routine (written to) should be made * 'volatile' to let the compiler know that those values may change outside the current context. * i.e.: "volatile uint16_t emg_value;" instead of "uint16_t emg_value" * in the example below, the variable is not re-used in the main function, and is thus declared * local in the looper function only. **/ void looper() { /*variable to store value in*/ uint16_t emg_value; /*put raw emg value both in red and in emg_value*/ red.write(emg0.read()); // read float value (0..1 = 0..3.3V) emg_value = emg0.read_u16(); // read direct ADC result, converted to 16 bit integer (0..2^16 = 0..65536 = 0..3.3V) /*send value to PC. Line below is used to prevent buffer overrun */ if(pc.rxBufferGetSize(0)-pc.rxBufferGetCount() > 30) pc.printf("%u\n",emg_value); /**When not using the LED, the above could also have been done this way: * pc.printf("%u\n", emg0.read_u16()); */ } int main() { /*setup baudrate. Choose the same in your program on PC side*/ pc.baud(115200); /*set the period for the PWM to the red LED*/ red.period_ms(2); /**Here you attach the 'void looper(void)' function to the Ticker object * The looper() function will be called every 0.01 seconds. * Please mind that the parentheses after looper are omitted when using attach. */ log_timer.attach(looper, 0.01); while(1) //Loop { /*Empty!*/ /*Everything is handled by the interrupt routine now!*/ } }