// freqresp.h

#define START_TASK      1
#define STOP_TASK       2

struct my_msg_struct {
	int command;
	int resolution;       // sample number for one period sinusoidal signal
	double sampling_period;    // sampling period [sec]
        int recording_samples;  // recording number
        int canceling_samples;   // sampling number skipping without recording
	int spk_num; // D/A pin number for speakers: 0:SPK2; 2:SPK1
        float amp; // amplitude of sinosoidal signal [V]
};

#define BUF_LEN 4

#define SAMPLING_PERIOD 200e-6 // sampling period [sec]
#define LENGTH_MAX 2500  // = maximum total time [sec] / sampling period; (maximum total time is specified firstly as you like)
#define PERIOD_MAX 500  // = 1 / minimum test frequency / sampling period; ex. 1 / 10[Hz] / 200e-6 [sec] becomes 500.

#define F10_LOW 1.     // common logarithm of the lowest test frequency [Hz]; ex. if the lowest frequency is 10 [Hz], then specify 1 here.
#define F10_HIGH 3.3   // common logarithm of the highest test frequency [Hz]; ex. if the highest frequency is 2 [kHz], then specify 3.3 here because 10^3.3 is 2000.
#define AMP_CH0 0.5 // amplitude of sinusoidal signal for SPK2 (secondary speaker)
#define AMP_CH1 2.0 // amplitude of sinusoidal signal for SPK1 (primary speaker)

#define F10_STEP 0.01     // varying step for common logarithm of frequency
#define LOOP 1            // cycles of execution from the lowest frequency to the highest frequency
#define WAITING_TIME 0.2  // waiting time in which sampling data is not recorded
// #define DEBUG // if defined, the lowest frequency is only tested and the time response is printed to standard out.