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Dependencies: mbed HIDScope BiQuad4th_order biquadFilter MODSERIAL
main.cpp
- Committer:
- vsluiter
- Date:
- 2014-09-10
- Revision:
- 8:8a17f65622b4
- Parent:
- 7:3396c3e33928
- Child:
- 9:d33e7b175ad7
File content as of revision 8:8a17f65622b4:
#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 = emg0.read(); // read float value (0..1 = 0..3.3V)
emg_value = emg0.read_u16(); // read direct ADC result (0..4096 = 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 0.002 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!*/
}
}