timer04.c

////////////////////////////////////////////////////////////////////////////////
//     
//    __                                ______
//   / /_______________  ____  ___     / ____/
//  / __/ ___/ ___/ __ \/ __ \/ _ \   /___ )  
// / /_(__  ) /__/ /_/ / /_/ /  __/  ____/ /  
// \__/____/\___/\____/ .___/\___/  /_____/   
//                   /_/                      
//     
// timer04.c
// - Double buttonpress response.
// - Instructions: press S+D when a SD appears, press K+L when KL appears.
////////////////////////////////////////////////////////////////////////////////


#include <tscope5.h>

int main()
{
    // open a display
    ts5_install_display();
    ts5_wait(2.0);
    
    // define 4 response buttons (2 left, 2 right)
    ts5_define_keyboard_button(TS5_KEY_S);
    ts5_define_keyboard_button(TS5_KEY_D);
    ts5_define_keyboard_button(TS5_KEY_K);
    ts5_define_keyboard_button(TS5_KEY_L);
        
        
    // helper variables for 2 responses
    double start;
    double stop1, rt1, error1;
    double stop2, rt2, 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);
        char stim1, stim2;
        if (stim==0) {
            stim1='S';
            stim2='D';
        }
        else {
            stim1='K';
            stim2='L';
        }
        
        ts5_clear_display();
        ts5_printf(0.0, 0.0, "%c%c", stim1, stim2);
        start = ts5_flip_display();

        // wait for 2 reponses:
        
        ts5_flush_responses();
        int resp1 = ts5_wait_for_response_until(&stop1, &error1, start + 2.0);
        ts5_hide_response_button(resp1);    // hide the first response 
                                        // so we are sure the second response
                                        // is not just a repetition of the first
        int resp2 = ts5_wait_for_response_until(&stop2, &error2, start + 2.0);
        ts5_hide_response_button(0);        // unhide

        // compute and print RT
        rt1 = stop1-start;
        rt2 = stop2-start;
        
        ts5_clear_display();
        int align = ts5_set_text_alignment(TS5_ALIGN_LEFT);
        ts5_printf(-200.0, 20.0, "responses: %d %d", resp1, resp2);
        ts5_printf(-200.0, 0.0, "rts: %f %f", rt1, rt2);
        ts5_printf(-200.0, -20.0, "measurement errors: %f %f", error1, error2);
        ts5_set_text_alignment(align);
        ts5_flip_display();
        
        // iti
        ts5_wait(2.0);      
    }
    
    // wait for a click
    ts5_draw_mouse_button(ax(0.9), ay(-0.8));   
    return 0;
}