picoBAT, an ultrasonic bat detector with 3 components

/*
 *******************************************************************************
 * picoBAT : an ultra simple ultrasonic bat detector
 *******************************************************************************
 *
 * Author : Bruno Gavand, February 2009
 * see more details on http://www.micro-examples.com/
 *
 * source code for mikro C compiler V8.2
 * feel free to use this code at your own risks
 *
 * target : PIC12
 *
 * PIC PIN Assignemnt :
 *
 * GP0 GP1 : piezo speaker
 * GP5 : ultrasonic transducer receiver
 *
 *******************************************************************************
 */

void    main()
        {
        /*
         * configure GPIO as digital port
         */
        CMCON0 = 7 ;
        ANSEL = 0 ;

        TRISIO = 0 ;
        GPIO = 0b01 ;

        for(;;)
                {
                /*
                 * toggles speaker outputs
                 */
                GPIO ^= 0b11 ;
                }
        }