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Werkend EMG script
Dependencies: HIDScope MODSERIAL biquadFilter mbed
Fork of EMG by
Diff: main.cpp
- Revision:
- 4:8b298dfada81
- Parent:
- 3:1296e996026a
- Child:
- 5:4dacb7b72109
diff -r 1296e996026a -r 8b298dfada81 main.cpp --- a/main.cpp Fri May 31 11:25:09 2013 +0000 +++ b/main.cpp Wed Oct 02 09:40:41 2013 +0000 @@ -1,26 +1,48 @@ #include "mbed.h" -//Classes +//Define objects AnalogIn emg0(PTB0); //Analog input PwmOut red(LED_RED); //PWM output Ticker timer; Serial pc(USBTX,USBRX); -//Functions +/** 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 float emg_value;" instead of "float 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() { - float emg_value; - red = emg_value = emg0; - pc.printf("%.6f\n",emg_value); + /*variable to store value in*/ + float emg_value; + /*put raw emg value both in red and in emg_value*/ + red = emg_value = emg0.read(); + /*send value to PC. use 6 digits precision*/ + pc.printf("%.6f\n",emg_value); } 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 0.001 seconds. + * Please mind that the parentheses after looper are omitted when using attach. + */ timer.attach(looper, 0.001); while(1) //Loop { - + /*Empty!*/ + /*Everything is handled by the interrupt routine now!*/ } } \ No newline at end of file