Diff: main.cpp

Revision:

0:2e007d983da0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri May 24 21:49:03 2013 +0000
@@ -0,0 +1,49 @@
+/*Program Example 9.8: Tests reaction time, and demos use of Timer and Timeout functions
+                                                                          */
+#include "mbed.h"
+#include <stdio.h>
+#include <stdlib.h>            //contains rand() function
+void measure ();
+Serial pc(USBTX, USBRX);
+DigitalOut led1(LED1);
+DigitalOut led4(LED4);
+DigitalIn responseinput(p5);  //the player hits the switch connected here to respond
+Timer t;                  //used to measure the response time
+Timeout action;               //the Timeout used to initiate the response speed test
+
+int main (){
+  pc.printf("Reaction Time Test\n\r");
+  pc.printf("------------------\n\r");
+  while (1) {
+    int r_delay;        //this will be the “random” delay before the led is blinked
+    pc.printf("New Test\n\r");
+    led4=1;                      //warn that test will start
+    wait(0.2);
+    led4=0; 
+    r_delay = rand() % 10 + 1;  // generates a pseudorandom number range 1-10
+    pc.printf("random number is %i\n\r", r_delay);  // allows test randomness; 
+                                                    //removed for normal play
+    action.attach(&measure,r_delay); // set up Timeout to call measure()
+                                                                 // after random time
+    wait(10);      //test will start within this time, and we then return to it
+   }
+}
+
+void measure (){      // called when the led blinks, and measures response time    
+  if (responseinput ==1){                            //detect cheating!
+    pc.printf("Don't hold button down!");
+  }
+  else{
+    t.start();             //start the timer
+    led1=1;                //blink the led
+    wait(0.05);
+    led1=0;
+    while (responseinput==0) {
+      //wait here for response
+    }
+    t.stop();                       //stop the timer once response detected
+    pc.printf("Your reaction time was %f seconds\n\r", t.read());
+    t.reset();   
+  }
+}
+