timer06.c

////////////////////////////////////////////////////////////////////////////////
//     
//    __                                ______
//   / /_______________  ____  ___     / ____/
//  / __/ ___/ ___/ __ \/ __ \/ _ \   /___ )  
// / /_(__  ) /__/ /_/ / /_/ /  __/  ____/ /  
// \__/____/\___/\____/ .___/\___/  /_____/   
//                   /_/                      
//     
// timer06.c
// - Measure button press time.
// - Instructions: press S when an S appears, press L when an L appears.
////////////////////////////////////////////////////////////////////////////////


#include <tscope5.h>

int main()
{
    // open a display
    ts5_install_display();
    ts5_wait(2.0);
    
    // define two buttons + the release of those buttons (using -)
    ts5_define_keyboard_button(TS5_KEY_S);
    ts5_define_keyboard_button(TS5_KEY_L);
    ts5_define_keyboard_button(-TS5_KEY_S);
    ts5_define_keyboard_button(-TS5_KEY_L);
        
    double start, stop, release, error1, error2;
    int i;
    for (i=0; i<5; i++) {
        
        // fixation
        ts5_clear_display();
        ts5_printf(0.0, 0.0, "+");
        ts5_flip_display();
        ts5_wait(0.5);
        
        // stimulus     
        unsigned int stim = ts5_random_integer(2);
        if (stim==0) {
            stim='S';
        }
        else {
            stim='L';
        }
        ts5_clear_display();
        ts5_printf(0.0, 0.0, "%c", stim);
        start = ts5_flip_display();
        
        // register the press (hide the responses corresponding to releases)        
        ts5_flush_responses();
        ts5_hide_response_button(0);
        ts5_hide_response_button(3);
        ts5_hide_response_button(4);
        int resp = ts5_wait_for_response_timed(&stop, &error1, 2.0);

        // register the release (hide the responses corresponding to presses)
        ts5_hide_response_button(0);
        ts5_hide_response_button(1);
        ts5_hide_response_button(2);
        ts5_wait_for_response_timed(&release, &error2, 2.0);

        // compute RT and press time
        ts5_clear_display();
        ts5_printf(0.0, 30.0, "response %d", resp);
        ts5_printf(0.0, 10.0, "rt %f, error %f", stop-start, error1);
        ts5_printf(0.0, -10.0, "release %f, measurement error %f", release-start, error2);
        ts5_printf(0.0, -30.0, "press time %f", release-stop);
        ts5_flip_display();
        
        // iti
        ts5_wait(2.0);      
    }
    
    ts5_draw_mouse_button(ax(0.9), ay(-0.8));   
    return 0;
}